How to Use IC for RS-232 Line Driver/Receivers

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User’s Manual
How to Use IC for RS-232 Line
Driver/Receivers
µPD4711B
µPD4712C/4712D
µPD4713A
µPD4714A
µPD4715A
µPD4721
µPD4722
µPD4723
µPD4724
µPD4726
Document No. S13354EJ3V0UM00 (3rd edition)
Date Published June 2003 NS CP(K)
1998
Printed in Japan
[MEMO]
2
User’s Manual S13354EJ3V0UM
• The information in this document is current as of June, 2003. The information is subject to change
without notice. For actual design-in, refer to the latest publications of NEC Electronics data sheets or
data books, etc., for the most up-to-date specifications of NEC Electronics products. Not all
products and/or types are available in every country. Please check with an NEC Electronics sales
representative for availability and additional information.
• No part of this document may be copied or reproduced in any form or by any means without the prior
written consent of NEC Electronics. NEC Electronics assumes no responsibility for any errors that may
appear in this document.
• NEC Electronics does not assume any liability for infringement of patents, copyrights or other intellectual
property rights of third parties by or arising from the use of NEC Electronics products listed in this document
or any other liability arising from the use of such products. No license, express, implied or otherwise, is
granted under any patents, copyrights or other intellectual property rights of NEC Electronics or others.
• Descriptions of circuits, software and other related information in this document are provided for illustrative
purposes in semiconductor product operation and application examples. The incorporation of these
circuits, software and information in the design of a customer's equipment shall be done under the full
responsibility of the customer. NEC Electronics assumes no responsibility for any losses incurred by
customers or third parties arising from the use of these circuits, software and information.
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Electronics products, customers must incorporate sufficient safety measures in their design, such as
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• NEC Electronics products are classified into the following three quality grades: "Standard", "Special" and
"Specific".
The "Specific" quality grade applies only to NEC Electronics products developed based on a customerdesignated "quality assurance program" for a specific application. The recommended applications of an NEC
Electronics product depend on its quality grade, as indicated below. Customers must check the quality grade of
each NEC Electronics product before using it in a particular application.
"Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio
and visual equipment, home electronic appliances, machine tools, personal electronic equipment
and industrial robots.
"Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster
systems, anti-crime systems, safety equipment and medical equipment (not specifically designed
for life support).
"Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life
support systems and medical equipment for life support, etc.
The quality grade of NEC Electronics products is "Standard" unless otherwise expressly specified in NEC
Electronics data sheets or data books, etc. If customers wish to use NEC Electronics products in applications
not intended by NEC Electronics, they must contact an NEC Electronics sales representative in advance to
determine NEC Electronics' willingness to support a given application.
(Note)
(1) "NEC Electronics" as used in this statement means NEC Electronics Corporation and also includes its
majority-owned subsidiaries.
(2) "NEC Electronics products" means any product developed or manufactured by or for NEC Electronics (as
defined above).
M8E 02. 11-1
User’s Manual S13354EJ3V0UM
3
The mark ★ shows major revised points.
4
User’s Manual S13354EJ3V0UM
CONTENTS
1.
INTRODUCTION ...............................................................................................................................
7
2.
FEATURES OF ICS FOR RS-232 LINE DRIVER/RECEIVERS ....................................................
7
3.
SERIES LINEUP...............................................................................................................................
3.1 Selection Guide........................................................................................................................
3.2 Ordering Information...............................................................................................................
8
8
8
4.
PACKAGE DRAWINGS, PIN CONFIGURATIONS, AND FUNCTIONAL
BLOCK DIAGRAMS......................................................................................................................... 9
4.1 Package Drawings ................................................................................................................... 9
4.2 Pin Configurations................................................................................................................... 14
4.3 Functional Block Diagrams .................................................................................................... 17
5.
BASIC OPERATIONS ...................................................................................................................... 18
5.1 Basic Operation of µPD471X Series....................................................................................... 18
5.2 Basic Operation of µPD472X Series....................................................................................... 18
6.
INTERNAL BLOCK DIAGRAMS .................................................................................................... 19
6.1 µPD471X Series........................................................................................................................ 19
6.1.1 DC/DC converter block ...............................................................................................................
19
6.1.2 Driver output logic ......................................................................................................................
20
6.1.3 Receiver output logic .................................................................................................................
20
6.1.4 Receiver input threshold voltage ..............................................................................................
20
6.1.5 Input pin treatment .....................................................................................................................
21
6.2 µPD472X Series........................................................................................................................ 22
6.2.1 DC/DC Converter Block ..............................................................................................................
22
6.2.2 Driver output logic ......................................................................................................................
23
6.2.3 Receiver output logic .................................................................................................................
23
6.2.4 Switching voltage boosting mode.............................................................................................
23
6.2.5 Input pin treatment .....................................................................................................................
24
7.
NOTES FOR USE ........................................................................................................................... 25
8.
TYPICAL CHARACTERISTICS ....................................................................................................... 26
9.
RS-232 STANDARD.........................................................................................................................
9.1 What is the RS-232 Standard?................................................................................................
9.2 Signal Level ..............................................................................................................................
9.3 Basics of RS-232C Communication.......................................................................................
32
32
32
33
10. TYPICAL APPLICATION ................................................................................................................. 34
11. REVISION HISTORY OF PRODUCTS .......................................................................................... 35
User’s Manual S13354EJ3V0UM
5
12. Q&A ...................................................................................................................................................
12.1 Internal Circuit Functions .....................................................................................................
12.2 Characteristics of Boosting Circuit .....................................................................................
12.3 External Capacitors ...............................................................................................................
12.4 Transfer Rate..........................................................................................................................
12.5 Reliability ................................................................................................................................
12.6 Marking, Packages and Others ............................................................................................
36
36
37
38
39
42
43
APPENDIX ELECTRICAL SPECIFICATIONS ...................................................................................... 45
Appendix 1. Main Characteristics of µPD471X Series (Ex.: µPD4714A) .................................. 45
Appendix 2. Main Characteristics of µPD472X Series (Ex.: µPD4724) .................................... 47
6
User’s Manual S13354EJ3V0UM
1. INTRODUCTION
The serial communication standard EIA/TIA-232-E (generally called “RS-232”), established by EIA and TIA, has
been used for industrial devices. However, today it is widely used as a communication means between office
automation equipment that equips serial interface, and PCs and PC peripheral devices or home appliances.
NEC Electronics lines up six µPD471X Series products and five µPD472X Series products so that they can be
widely applied to various devices for industrial equipment and appliances as ICs for RS-232 line driver/receivers.
This document summarizes usage of the products, technical data, and notes for using these ICs.
Your necessary information is found as follows:
• For overview of RS-232 standard:
→ Refer to Chapter 9. RS-232 STANDARD.
• For overview and list of NEC Electronics’s
→ Refer to Chapter 2. FEATURES OF ICS FOR RS-232 LINE
products:
DRIVER/RECEIVERS and Chapter 3. SERIES LINEUP.
• For details on functions of NEC Electronics’s
→ Refer to Chapter 6. INTERNAL BLOCK DIAGRAMS.
products:
→ Refer to Chapter 8. TYPICAL CHARACTERISTICS.
• For characteristics and performance
of NEC Electronics’s products:
→ Refer to Chapter 12. Q&A.
• For answers to common questions and
how-to:
2. FEATURES OF ICS FOR RS-232 LINE DRIVER/RECEIVERS
There are two types of product series of ICs for RS-232 Line Driver/Receiver, and each type has following
features:
! µPD471X Series
• Compliant with EIA/TIA-232-E standard.
• Operated by single power supply with voltage of +5 V
• Positive and negative outputs by four external capacitors and on-chip DC/DC converter
• On-chip driver output control functions
• Function for selecting receiver input threshold voltage
• Low current dissipation mode by standby function
• Two types of packages: DIP and SOP
! µPD472X Series
• Complied with EIA/TIA-232-E Standard
• Operated by single power supply with either voltage of +5 V or +3.3 V
• Positive and negative outputs by four or five external capacitors and on-chip DC/DC converter
• Low current dissipation mode by standby function
• On-chip receiver functions which can be operated during standby
• SSOP package for space saving
User’s Manual S13354EJ3V0UM
7
3. SERIES LINEUP
3.1 Selection Guide
The list of ICs for RS-232 line driver/receivers is shown below.
Driver
Receive
r
Power
Supply
Voltage
Standby
Driver Output
Control
Low Current Dissipation
Receiver Operation Mode
µPD4711B
2
2
5V
!
!
×
µPD4712C
4
4
5V
!
!
×
µPD4712D
4
4
5V
!
!
×
µPD4713A
3
3
5V
!
!
×
µPD4714A
3
5
5V
!
!
×
µPD4715A
5
3
5V
!
!
×
µPD4721
2
2
3.3/5 V
!
×
×
µPD4722
4
4
3.3/5 V
!
×
!
µPD4723
3
3
3.3/5 V
!
×
!
µPD4724
3
5
3.3/5 V
!
×
!
µPD4726
4
7
5V
!
×
!
Part Number
!: Available
×: Not available
★ 3.2 Ordering Information
Ordering information and the package list of ICs for RS-232 line driver/receivers are shown below.
Part Number
µPD4711B
Package
µPD4711BCX
20-pin DIP (7.62 mm (300) )
µPD4711BGS
20-pin SOP (7.62 mm (300) )
µPD4712CCY
28-pin DIP (10.16 mm (400) )
µPD4712CGT
28-pin SOP (9.53 mm (375) )
µPD4712DCY
28-pin DIP (10.16 mm (400) )
µPD4712DGT
28-pin SOP (9.53 mm (375) )
µPD4713ACX
24-pin DIP (7.62 mm (300) )
µPD4713AGT
24-pin SOP (9.53 mm (375) )
µPD4714ACY
28-pin DIP (10.16 mm (400) )
µPD4714AGT
28-pin SOP (9.53 mm (375) )
µPD4715ACY
28-pin DIP (10.16 mm (400) )
µPD4715AGT
28-pin SOP (9.53 mm (375) )
µPD4721
µPD4721GS-GJG
20-pin SSOP (7.62 mm (300) )
µPD4722
µPD4722GS-GJG
30-pin SSOP (7.62 mm (300) )
µPD4723
µPD4723GS-GJG
30-pin SSOP (7.62 mm (300) )
µPD4724
µPD4724GS-GJG
30-pin SSOP (7.62 mm (300) )
µPD4726
µPD4726GS-BAF
36-pin SSOP (7.62 mm (300) )
µPD4712C
µPD4712D
µPD4713A
µPD4714A
µPD4715A
8
Ordering Information
User’s Manual S13354EJ3V0UM
4. PACKAGE DRAWINGS, PIN CONFIGURATIONS, AND FUNCTIONAL BLOCK DIAGRAMS
★ 4.1 Package Drawings
20-PIN PLASTIC DIP (7.62mm(300))
20
11
1
10
A
K
J
L
P
I
H
C
F
D
N
R
M
B
G
M
NOTES
1. Each lead centerline is located within 0.25 mm of
its true position (T.P.) at maximum material condition.
2. ltem "K" to center of leads when formed parallel.
ITEM
MILLIMETERS
A
B
25.40 MAX.
1.27 MAX.
C
2.54 (T.P.)
D
F
0.50±0.10
1.1 MIN.
G
3.5±0.3
H
0.51 MIN.
I
4.31 MAX.
J
5.08 MAX.
K
7.62 (T.P.)
L
6.4
M
0.25 +0.10
−0.05
N
0.25
P
0.9 MIN.
R
0∼15°
P20C-100-300A,C-2
24-PIN PLASTIC DIP (7.62mm(300))
24
13
1
12
A
K
J
I
H
G
L
P
F
D
C
N
M
M
R
B
NOTES
ITEM
MILLIMETERS
1. Each lead centerline is located within 0.25 mm of
its true position (T.P.) at maximum material condition.
A
B
33.02 MAX.
2.54 MAX.
2. ltem "K" to center of leads when formed parallel.
C
D
F
2.54 (T.P.)
0.50±0.10
1.2 MIN.
G
3.5±0.3
H
0.51 MIN.
I
4.31 MAX.
J
5.08 MAX.
K
7.62 (T.P.)
L
6.4
M
0.25 +0.10
–0.05
N
0.25
P
1.0 MIN.
R
0∼15°
P24C-100-300A-2
User’s Manual S13354EJ3V0UM
9
28-PIN PLASTIC DIP (10.16mm(400))
28
15
1
14
A
K
J
L
P
I
F
H
C
D
G
N
M
M
R
B
NOTES
ITEM
MILLIMETERS
A
B
35.56 MAX.
1.27 MAX.
1. Each lead centerline is located within 0.25 mm of
its true position (T.P.) at maximum material condition.
C
2. ltem "K" to center of leads when formed parallel.
2.54 (T.P.)
D
0.50±0.10
F
1.1 MIN.
G
H
3.5±0.3
0.51 MIN.
I
4.31 MAX.
J
5.72 MAX.
K
10.16 (T.P.)
L
8.6
0.25 +0.10
−0.05
M
N
0.25
P
0.9 MIN.
R
0∼15°
P28C-100-400-2
20-PIN PLASTIC SOP (7.62 mm (300))
20
11
detail of lead end
P
1
10
A
H
I
G
J
S
L
B
C
D
M
M
N
K
S
E
F
NOTE
ITEM
Each lead centerline is located within 0.12 mm of
its true position (T.P.) at maximum material condition.
MILLIMETERS
A
12.7±0.3
B
0.78 MAX.
C
1.27 (T.P.)
D
0.42 +0.08
−0.07
E
0.1±0.1
F
1.8 MAX.
G
1.55±0.05
H
7.7±0.3
I
5.6±0.2
J
1.1
K
0.22 +0.08
−0.07
L
M
0.6±0.2
0.12
N
0.10
P
3° +7°
−3°
P20GM-50-300B, C-7
10
User’s Manual S13354EJ3V0UM
24-PIN PLASTIC SOP (9.53 mm (375))
24
13
detail of lead end
P
1
12
A
H
F
G
I
J
S
C
D
M
B
L
S
N
K
M
E
NOTE
Each lead centerline is located within 0.12 mm of
its true position (T.P.) at maximum material condition.
ITEM
MILLIMETERS
A
15.4±0.14
B
0.78 MAX.
C
1.27 (T.P.)
D
0.42 +0.08
−0.07
E
0.125±0.075
F
2.77 MAX.
G
2.47±0.1
H
10.3±0.3
I
7.2
J
1.6
K
0.17 +0.08
−0.07
L
M
0.8±0.2
0.12
N
0.15
P
3° +7°
−3°
P24GM-50-375B-6
28-PIN PLASTIC SOP (9.53 mm (375))
28
15
detail of lead end
P
1
14
A
H
F
I
G
J
S
C
D
M
B
L
N
M
S
K
E
NOTE
Each lead centerline is located within 0.12 mm of
its true position (T.P.) at maximum material condition.
ITEM
A
MILLIMETERS
17.9±0.17
B
0.78 MAX.
C
1.27 (T.P.)
D
0.42 +0.08
−0.07
E
0.1±0.1
F
2.6±0.2
G
2.50
H
10.3±0.3
I
7.2±0.2
J
1.6±0.2
K
0.17 +0.08
−0.07
L
0.8±0.2
M
0.12
N
0.15
P
3° +7°
−3°
P28GM-50-375B-5
User’s Manual S13354EJ3V0UM
11
20-PIN PLASTIC SSOP (7.62 mm (300))
20
11
detail of lead end
P
1
10
A
H
F
I
G
J
S
N
L
S
K
C
D
M
B
M
E
NOTE
ITEM
A
Each lead centerline is located within 0.12 mm of
its true position (T.P.) at maximum material condition.
B
MILLIMETERS
6.7±0.3
0.575 MAX.
C
0.65 (T.P.)
D
0.32 +0.08
−0.07
E
0.125±0.075
F
G
H
2.0 MAX.
1.7±0.1
8.1±0.3
I
J
6.1±0.2
1.0±0.2
K
0.15 +0.10
−0.05
L
M
N
P
0.5±0.2
0.12
0.10
3° +7°
−3°
P20GM-65-300B-4
30-PIN PLASTIC SSOP (7.62 mm (300))
30
16
detail of lead end
P
1
15
A
F
H
G
I
J
S
C
D
M
N
S
B
L
K
M
E
NOTE
Each lead centerline is located within 0.10 mm of
its true position (T.P.) at maximum material condition.
ITEM
A
B
MILLIMETERS
9.85±0.26
0.51 MAX.
C
0.65 (T.P.)
D
0.32 +0.08
−0.07
E
F
G
H
I
J
K
L
M
N
P
0.125±0.075
2.0 MAX.
1.7±0.1
8.1±0.2
6.1±0.2
1.0±0.2
+0.08
0.17 −0.07
0.5±0.2
0.10
0.10
3° +7°
−3°
P30GS-65-300B-3
12
User’s Manual S13354EJ3V0UM
36-PIN PLASTIC SSOP (7.62 mm (300))
36
19
detail of lead end
R
1
18
A
H
F
I
G
J
S
C
L
B
N
K
D
M
S
M
E
NOTE
Each lead centerline is located within 0.10 mm of
its true position (T.P.) at maximum material condition.
ITEM
A
MILLIMETERS
15.3±0.24
B
0.97 MAX.
C
0.8 (T.P.)
D
0.37 +0.08
−0.07
E
0.125±0.075
D
1.675+0.125
−0.175
G
1.55
H
7.7±0.3
I
5.6±0.15
G
1.05±0.2
K
0.22+0.08
−0.07
L
0.6±0.2
M
N
0.10
0.10
R
5°±5°
P36GM-80-300B-5
User’s Manual S13354EJ3V0UM
13
4.2 Pin Configurations
µ PD4711B
µ PD4712C/D
+ 10 V
1 VDD
C3 +
C4+ 20
2 C1+
GND 19
3 VCC
C4– 18
4 C1–
VSS 17
C1 +
+5V
STBY 5
DIN1 6
DIN2 7
+
C4
+
C2
+ 10 V
1 VDD
C3 +
C4+ 28
2 C1+
GND 27
3 VCC
C4– 26
4 C1–
VSS 25
C1 +
+5V
– 10 V
5 GND
16 DCON
300 Ω
300 Ω
ROUT1 8
DIN1 6
15 DOUT1
DIN2 7
14 DOUT2
DIN3 8
13 RIN1
5.5 kΩ
ROUT2 9
5.5 kΩ
GND 10
12 RIN2
DIN4 9
11 RCON
DCON 10
ROUT1 11
ROUT2 12
ROUT3 13
+5V
C4+ 24
2 C1+
GND 23
3 VCC
C4– 22
4 C1–
VSS 21
STBY 5
DIN1 6
DIN2 7
DIN3 8
+
C4
300 Ω
300 Ω
300 Ω
300 Ω
300 Ω
5.5 kΩ
ROUT2 10
300 Ω
– 10 V
300 Ω
22 DOUT2
21 DOUT3
20 DOUT4
19 RIN1
5.5 kΩ
18 RIN2
5.5 kΩ
5.5 kΩ
5.5 kΩ
17 RIN3
16 RIN4
15 RCON
+
C2
C4+ 28
2 C1+
GND 27
3 VCC
C4– 26
4 C1–
VSS 25
C1 +
+5V
– 10 V
5 GND
19 DOUT1
18 DOUT2
17 DOUT3
DIN1 6
DIN2 7
DIN3 8
16 RIN1
DCON 9
15 RIN2
ROUT1 10
14 RIN3
ROUT2 11
13 RCON
ROUT3 12
5.5 kΩ
ROUT3 11
5.5 kΩ
ROUT4 13
ROUT5 14
14
C2
23 DOUT1
+ 10 V
1 VDD
C3 +
20 DCON
ROUT1 9
GND 12
+
µ PD4714A
+ 10 V
1 VDD
C3 +
C1 +
C4
24 STBY
ROUT4 14
µ PD4713A
+
User’s Manual S13354EJ3V0UM
+
C4
24 STBY
300 Ω
300 Ω
300 Ω
5.5 kΩ
5.5 kΩ
5.5 kΩ
5.5 kΩ
5.5 kΩ
23 DOUT1
22 DOUT2
21 DOUT3
20 RIN1
19 RIN2
18 RIN3
17 RIN4
16 RIN5
15 RCON
+
C2
– 10 V
µ PD4721
µ PD4715A
+ 10 V
1 VDD
C3 +
C1 +
+5V
C4+ 28
2 C1
+
GND 27
3 VCC
C4– 26
4 C1–
VSS 25
5 GND
DIN1 6
300 Ω
DIN2 7
300 Ω
DIN3 8
300 Ω
DIN4 9
300 Ω
DIN5 10
5.5 kΩ
ROUT2 13
+
C2
5.5 kΩ
GND 19
3 VCC
C4– 18
4 C1–
VSS 17
– 10 V
5 C5+
C5
22 DOUT2
DIN1 7
21 DOUT3
DIN2 8
20 DOUT4
ROUT1 9
19 DOUT5
ROUT2 10
C4
+
C2
– 10 V
16 STBY
6 C5–
23 DOUT1
+
15 VCHA
300 Ω
300 Ω
14 DOUT1
13 DOUT2
12 RIN1
5.5 kΩ
11 RIN2
5.5 kΩ
17 RIN2
16 RIN3
µ PD4723
+ 10 V
1 VDD
C3 +
C3 +
2 C1
+
+
+ 3.3 V C1
or
+5V
µ PD4722
C1 +
C4+ 20
15 RCON
ROUT3 14
+ 3.3 V
or
+5V
– 10 V
1 VDD
C3 +
18 RIN1
5.5 kΩ
ROUT1 12
C4
24 STBY
300 Ω
DCON 11
+
C4+ 30
2 C1
+
GND 29
3 VCC
C4– 28
4 C1–
VSS 27
+
C4
+
26 STBY
6 GND
25 VCHA
DIN2 9
DIN3 10
DIN4 11
2 C1
+
GND 29
3 VCC
C4– 28
4 C1–
VSS 27
C1 +
C3 +
300 Ω
300 Ω
300 Ω
300 Ω
22 DOUT2
C4
26 STBY
6 GND
25 VCHA
DIN1 8
DIN2 9
21 DOUT3
DIN3 10
20 DOUT4
ROUT1 11
+
C2
– 10 V
24 EN
7 C5
23 DOUT1
+
5 C5+
–
24 EN
7 C5
DIN1 8
+ 3.3 V
or
+5V
C4+ 30
– 10 V
5 C5+
–
C2
+ 10 V
1 VDD
C3 +
300 Ω
300 Ω
300 Ω
23 DOUT1
22 DOUT2
21 DOUT3
20 RIN1
5.5 kΩ
ROUT1 12
ROUT2 12
19 RIN1
5.5 kΩ
ROUT2 13
ROUT3 13
18 RIN2
5.5 kΩ
ROUT3 14
19 RIN2
5.5 kΩ
18 RIN3
5.5 kΩ
17 RIN3
NC 14
17 NC
16 RIN4
NC 15
16 NC
5.5 kΩ
ROUT4 15
5.5 kΩ
User’s Manual S13354EJ3V0UM
15
µ PD4724
+ 3.3 V
or
+5V
µ PD4726
+ 10 V
1 VDD
C3 +
C4+ 30
2 C1+
GND 29
3 VCC
C4– 28
4 C1–
VSS 27
C1 +
C3 +
+
5 C5
+
C4
+
C2
+ 3.3 V
or
+5V
–
7 C5
300
DIN1 8
300
DIN2 9
300
DIN3 10
ROUT1 11
C4– 36
2 C1–
GND 35
3 VCC
C4– 34
C1 +
– 10 V
26 STBY
6 GND
+ 10 V
1 VDD
C3 +
4 C1–
5 NC
25 VCHA
6 GND
24 EN
7 NC
23 DOUT1
22 DOUT2
21 DOUT3
To internal
circuit
300
300
DIN3 10
19 RIN2
ROUT1 12
32 STBY
31 VCHA
30 EN
300
DIN2 9
DIN4 11
300
29 DOUT1
28 DOUT2
27 DOUT3
26 DOUT4
5.5 k
ROUT2 12
5.5 k
ROUT3 13
18 RIN3
ROUT4 14
ROUT2 13
24 RIN2
5.5 k
17 RIN4
ROUT3 14
5.5 k
ROUT5 15
25 RIN1
5.5 k
5.5 k
23 RIN3
5.5 k
16 RIN5
ROUT4 15
5.5 k
22 RIN4
5.5 k
21 RIN5
ROUT5 16
5.5 k
20 RIN6
ROUT6 17
5.5 k
ROUT7 18
16
User’s Manual S13354EJ3V0UM
C4
VSS 33
To internal
circuit
DIN1 8
20 RIN1
+
19 RIN7
5.5 k
+
C2
– 10 V
4.3 Functional Block Diagrams
µPD471X Series
DOUT
RIN
VDD
C3
VCC
C1
±10 V
DC/DC
Converter
C4
±10 V
Threshold
voltage
GND
C4
VSS
STBY
DCON
RCON
DIN
ROUT
µPD472X Series
C5
VCHA
(Type1)
RIN
DOUT
(Type2)
RIN
VDD
C3
VCC
C1
±10 V
DC/DC
Converter
C4
±10 V
Threshold
voltage
GND
C4
VSS
STBY
EN
DIN
User’s Manual S13354EJ3V0UM
ROUT
ROUT
17
5. BASIC OPERATIONS
5.1 Basic Operation of µPD471X Series
The basic operation of the µPD471X Series is shown in the figure below.
STBY
VDD
VSS
DCON
DIN
DOUT
Hi-Z
Hi-Z
Hi-Z
Hi-Z
RCON
RIN
ROUT
Remark Hi-Z: High impedance
5.2 Basic Operation of µPD472X Series
The basic operation of the µPD472X Series is shown in the figure below.
STBY
VCHA
3V
5V
VCC
VDD
VSS
DIN
DOUT
Hi-Z
Hi-Z
EN
RIN
ROUTA
ROUTB
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User’s Manual S13354EJ3V0UM
6. INTERNAL BLOCK DIAGRAMS
6.1 µPD471X Series
6.1.1 DC/DC converter block
The µPD471X Series incorporate a DC/DC converter block. A DC/DC converter is a circuit to boost VCC to VDD/VSS
to generate the necessary voltage level for RS-232 communication by fast switching with external capacitors.
RS-232 communication, which requires positive and negative power supplies even with a single voltage of 5 V,
can be achieved by integrating this circuit with a RS-232 line driver/receiver.
The maximum voltage of electric potential difference applied at the both ends of each capacitor having
characteristics of DC/DC converter circuit is shown in the table below, and the theoretical operating waveform of each
pin is shown in the figure below.
Also, DC/DC converter circuit is stopped when STBY is at H. At this moment, VDD = VCC and VSS = GND.
The electric potential difference applied to
each capacitor when VCC = 5 V
Capacitor
Voltage (V)
+
–
5
+
–
10
+
–
C3 – C3
5
C4+ – C4–
5
C1 – C1
C2 – C2
Operating waveform at capacitors
STBY
5V
0V
10 V
C1+
5V
0V
C1–
–5V
10 V
5V
C4+
0V
C4–
–5V
VDD
10 V
5V
0V
– 10 V
VSS
User’s Manual S13354EJ3V0UM
19
6.1.2 Driver output logic
STBY is the Standby Control Signal.
When STBY is at H, DOUT becomes high impedance regardless of the status of DCON and DIN. While STBY is at L,
driver output depends on input signals from DCON and DIN.
DCON is driver output control signal and active at high.
When DCON is H, DIN (TTL level) is reversed and output from DOUT (RS-232 level). While DCON is L, DOUT is fixed at
L regardless of the status of DIN.
Truth table of driver output logic is shown below (refer to 12.1 Internal Circuit Functions in 12. Q&A for actual
usage of DCON).
STBY
DCON
DIN
DOUT
Remarks
H
X
X
Hi-Z
L
L
X
L
Mark level output
L
H
L
H
Space level output
L
H
H
L
Mark level output
Standby mode (DC/DC Converter stopped)
Remark H: High level, L: Low level, X: H or L
6.1.3 Receiver output logic
When STBY is at H, ROUT becomes High Impedance state regardless of the status of RIN. While STBY is at L, RIN
(RS-232 level) is reversed and output from ROUT (TTL level).
Truth table of receiver output logic is shown below.
STBY
RIN
ROUT
Remarks
H
X
Hi-Z
L
L
H
Mark level output
L
H
L
Space level output
Standby Mode (DC/DC converter stopped)
6.1.4 Receiver input threshold voltage
The µPD471X Series has a function to switch receiver input threshold voltage as its specific function. Refer to
individual data sheet for characteristics of threshold voltage.
When RCON is at L, ROUT always operates in A Mode. When RCON is at H, RINA operates in A Mode and RINB
operates in B Mode as the table below.
The truth table and pin list of each part number are shown below (refer to 12.1 Internal Circuit Functions in 12.
Q&A for actual usage of RCON)
The truth table of receiver input threshold
20
RCON
RINA
RINB
L
A Mode
A Mode
H
A Mode
B Mode (C Mode only in µPD4712D)
User’s Manual S13354EJ3V0UM
The pin list of each product in A Mode and B Mode
Part Number
RINA
RINB
–
RIN1, RIN2
RIN1, RIN2
RIN3, RIN4
µPD4713A
RIN1
RIN2, RIN3
µPD4714A
RIN1, RIN2, RIN3
RIN4, RIN5
µPD4715A
RIN1
RIN2, RIN3
µPD4711B
µPD4712C/4712D
6.1.5 Input pin treatment
The internal configuration of input pins of the µPD471X Series is shown in the table below. If an input pin is
opened, through current flows as CMOS-specific characteristics. Therefore, open pins should be treated as follows:
Pin Name
Pull-up or Pull-down
Resistor
STBY
Pull-down resistor
DCON
None
Handling of Open Pins
Even if the input is open, the input
becomes “L” and the operationmode is active.
Be sure to fix it at “H” or “L” level
before using.
DIN
RCON
RIN
Pull-down resistor
(5.5 kΩ)
Even if the input is open, the input
becomes “L” and the output
becomes “H.”
User’s Manual S13354EJ3V0UM
21
6.2 µPD472X Series
6.2.1 DC/DC converter block
The µPD472X Series incorporates a DC/DC converter block. A DC/DC converter Block is a circuit to boost VCC to
VDD/VSS to generate the necessary voltage level for RS-232 communication by fast switching with external capacitors.
It has a Double Boosting Mode and Triple Boosting Mode to use single power supply either voltage with 5 V or 3.3 V
as specific function of µPD472X Series.
RS-232 communication, which requires positive and negative power supplies even with a single voltage of 5 V or
3.3 V, can be achieved by integrating this circuit with an RS-232 line driver/receiver.
The maximum voltage of electric potential difference applied at both ends of each capacitor having characteristics
of DC/DC converter circuit is shown in the table below, and theoretical operating waveform of each pin (Only in 3-V
mode. The waveform in 5-V mode is the same as the one of the µPD471X Series.) is shown in the figure below.
Also, DC/DC Converter circuit is stopped when STBY is at L. At this moment, VDD = VCC and VSS = GND.
Electric potential difference applied to each capacitor
when VCC = 5 V (5-V Mode) or 3 V (3-V Mode)
Voltage (V)
Capacitor
C1+ – C1–
5-V Mode
3-V Mode
5.0
3.0
+
–
10.0
9.0
+
–
5.0
6.0
+
–
5.0
3.0
+
–
5.0
3.0
C2 – C2
C3 – C3
C4 – C4
C5 – C5
Operating waveform at capacitors
STBY
3V
0V
6V
3V
0V
–3V
–6V
C1+
C1–
9V
6V
3V
0V
–3V
C4+
C4–
C5+
3V
0V
C5–
–6V
–9V
10 V
VDD
3V
0V
VSS
– 10 V
22
User’s Manual S13354EJ3V0UM
6.2.2 Driver output logic
When STBY is at L, DOUT becomes high impedance regardless of the status of DCON and DIN.
When STBY is H, DIN (TTL level) is reversed and output from DOUT (RS-232 level).
The truth table of driver output logic is shown below.
STBY
DIN
DOUT
Remarks
L
X
Hi-Z
H
L
H
Space level output
H
H
L
Mark level output
Standby Mode (DC/DC converter stopped)
6.2.3 Receiver output logic
When STBY is at L, two types of standby modes can be selected depending on the EN logic. When EN is L,
regardless of the status of RIN (RS-232 level), H is output for ROUT (TTL level). When EN is H, ROUTA (TTL level) is
output by an inverter without hysteresis for the input of RINA (RS-232 level). Regardless of RINB (RS-232 level), H is
output for ROUTB (TTL level).
When STBY is H, RIN (RS-232 level) is reversed and output from ROUT (TTL level) regardless of the EN state.
The truth table of the receiver output logic is shown below (refer to 12.1 Internal Circuit Functions in 12. Q&A
for actual sample usage of EN pin).
Truth table of receiver output logic
RIN
STBY
ROUT
EN
Remarks
RINA
RINB
ROUTA
ROUTB
L
L
X
X
H
H
Standby Mode 1 (DC/DC converter stopped)
L
H
L
X
H
H
Standby Mode 2 (DC/DC converter stopped)
L
H
H
X
L
H
Standby Mode 2 (DC/DC converter stopped)
H
X
L
H
Mark level output
H
X
H
L
Space level output
Pin list of each product in A Mode and B Mode
Part Number
RINA
RINB
µPD4721
–
RIN1, RIN2
µPD4722
RIN3, RIN4
RIN1, RIN2
µPD4723
RIN2, RIN3
RIN1
µPD4724
RIN4, RIN5
RIN1, RIN2, RIN3
µPD4726
RIN6, RIN7
RIN1, RIN2, RIN3, RIN4, RIN5
6.2.4 Switching voltage boosting mode
Voltage boosting mode of internal DC/DC converter can be switched by VCHA. When the voltage of the power
supply used is lowered (5 V → 3 V), it can be switched even when the power is turned on.
When you switch the voltage boosting mode, the operation mode must be Standby Mode (STBY = L).
VCHA
Operating Mode
L
5-V Mode (double boost)
H
3-V Mode (triple boost)
User’s Manual S13354EJ3V0UM
23
6.2.5 Input pin treatment
The internal configuration of input pins of the µPD472X Series is shown in the table below. If an input pin is left
open, through current flows due to CMOS-specific characteristics. Therefore, open pins should be treated as follows.
Pin Name
★
STBY
Note
Pull-up or Pull-down
Resistor
None
Handling of Open Pin
Fix to “H” or “L” level.
VCHA
EN
DIN
Active pull-up resistor
(up to 300 kΩ)
Even if the input is open, the input
becomes “H” and the output
becomes “L.”
RIN
Pull-down resistor
(5.5 kΩ)
Even if the input is open, the input
becomes “L” and the output
becomes “H.”
A pull-up resistor is connected to the DIN pin so that the input potential is fixed even it is opened. This pull-up
resistor is an active resistor whose resistance becomes higher when the input potential is low and becomes lower
when the input potential is high (refer to 8. TYPICAL CHARACTERISTICS).
Therefore, when the input voltage is L, the current passed through the pull-up resistor is 25 µA MAX., and the
power dissipation due to the input current is negligibly low.
Also, fix the DIN pin open or to H to minimize the power dissipation in Standby (STBY = L).
At this time, the input current is 1 µA or lower, and the power dissipation due to the input current through pull-up
resistor is minimized.
Note µPD4726 has a pull-down resistor in STBY pin. Therefore, when the input of µPD4726 is open, the input
becomes “L” and the operation mode is standby.
24
User’s Manual S13354EJ3V0UM
7. NOTES FOR USE
The following items are general notes for using ICs for RS-232 line driver/receivers. They are common between
the µPD471X Series and the µPD472X Series unless otherwise specified.
Power block
• If VCC is unstable, the on-chip DC/DC converter circuit may not properly operate. Therefore, it is recommended
to connect a bypass capacitor (approximately 0.1 to 1 µF) between VCC and GND.
• Since VDD and VSS are output pins and their voltages are boosted up by the internal DC/DC converter circuit, do
not feed or take out current to/from these pins (such as connecting any load). If any load is connected to these
pins, the on-chip DC/DC converter circuit may not properly operate (refer to 12.2 Characteristics of Boosting
Circuit in 12. Q&A for typical characteristics).
Pin treatment
• Fix all pins for control input (such as DCON, RCON, and STBY pins) to High or Low, if no pull-down resistor is
connected to them.
• If a driver input pin is open, through current may flow. Fix all unconnected driver input pins to High or Low (for
µPD471X Series).
• Ensure that voltage over rated voltage such as surge is not impressed to receiver input pins. If there is a
possibility that the voltage higher than rated voltage is applied, it is recommended to connect an external
protection circuit (refer to 12.5 Reliability in 12. Q&A for a typical application).
Selection of external capacitors
• Tantalum, aluminum electrolytic, and ceramic capacitors can be used for external capacitors for on-chip DC/DC
converters. Since they are repeatedly charged and discharged by internal switching, use capacitors with better
frequency characteristics.
• It is recommended to apply capacitors with a capacitance range of 4.7 to 47 µF (for the µPD471X Series,
excepting the µPD4711B with capacitance range of 1 to 47 µF) and 0.33 to 4.7 µF (for the µPD472X Series,
excepting µPD4722 with capacitance range of 0.47 to 4.7 µF). Determine appropriate capacitance within these
ranges after evaluating with the actual product circuit. Note that the capacitance of electrolytic capacitors is
lowered in low temperatures. Therefore, determine the capacitance of such capacitors with some margin
taking into account the operating temperature.
• If only 5-V Mode (VCHA =“L” and VCC = 5 V) is used, it is not necessary to connect the C5 capacitor. In this case,
the C5 pin should be left open (for µPD472X Series).
User’s Manual S13354EJ3V0UM
25
8. TYPICAL CHARACTERISTICS
The main characteristics of the µPD4722 as a representative product for RS-232 line driver/receivers are shown
below.
• Driver Input Characteristics
The characteristics of a pull-up resistor (active resistor) at a driver input pin are shown below.
(1) In 5-V Mode operation
(2) In 3.3-V Mode operation
• Characteristics of Driver Output slew rate vs. load capacitance
The slew rate characteristics when a load capacitance is connected to driver output 1 are shown below.
Conditions: VCC = 5 V and 3.3 V
External capacitor = 1.0 µF (Tantalum)
RL = 3 kΩ (only at one output)
Note that the slew rate characteristics are lower than the curve shown here if simultaneous switching for all
outputs is performed.
• Characteristics of driver output voltage vs. output current
The output characteristics with current at driver output are shown below.
Conditions: VCC = 4.5 to 5.5 V and 3.0 to 3.6 V
External capacitor = 0.47 µF
With all driver outputs
(1) Ceramic capacitors are used.
(2) Tantalum capacitors are used.
(3) Aluminum electrolytic capacitors are used.
• Characteristics of driver output voltage vs. external capacitors
The driver output characteristics when the capacitance of external capacitor is changed are shown below.
Conditons: VCC = 4.5 V and 3.0 V
Load 3 kΩ
With all driver outputs
26
User’s Manual S13354EJ3V0UM
• Driver input characteristics
VCC = +3.3 V
500.0
400
400
Pull-up resistor R (kΩ)
Pull-up resistor R (kΩ)
VCC = +5.0 V
500.0
300
200
300
200
100
0
100
0
1
2
3
4
0
5.0
0
1
Driver input voltage VDI (V)
2
3
4
5.0
Driver input voltage VDI (V)
• Characteristics of driver output slew rate vs. load capacitance
15
15
Falling edge
10
Rising edge
5
0
10
VCC = 3.3 V, TA = 25 C
External capacitor = 1.0 µ F (Tantalum)
RL = 3.0 k
Switching only one driver
Driver output slew rate SR (V/µ s)
Driver output slew rate SR (V/µ s)
VCC = 5.0 V, TA = 25 C
External capacitor = 1.0 µ F (Tantalum)
RL = 3.0 k
Switching only one driver
100
1000
10
Falling edge
Rising edge
5
0
10
Load capacitance CL (pF)
100
1000
Load capacitance CL (pF)
User’s Manual S13354EJ3V0UM
27
• Characteristics of driver output voltage vs. output current
(Ceramic capacitors used)
C1 to C5 = 0.47 µF
VCC = 5.5 V
0
VCC = 5.0 V
VCC = 4.5 V
8
6
4
2
0
– 5.0
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
10.0
–2
–4
–6
VCC = 4.5 V
VCC = 5.0 V
–8
VCC = 5.5 V
– 10.0
0
0
Driver output current IDO (mA)
Driver output current IDO (mA)
0
VCC = 3.6 V
VCC = 3.3 V
VCC = 3.0 V
8
6
4
2
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
10.0
–2
–4
VCC = 3.0 V
–6
VCC = 3.3 V
VCC = 3.6 V
–8
– 10.0
0
– 5.0
0
0
Driver output current IDO (mA)
28
5.0
5.0
Driver output current IDO (mA)
User’s Manual S13354EJ3V0UM
• Characteristics of driver output voltage vs. output current
(Tantalum capacitors used)
C1 to C5 = 0.47 µF
VCC = 5.5 V
0
VCC = 5.0 V
VCC = 4.5 V
8
6
4
2
0
– 5.0
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
10.0
–2
–4
–6
VCC = 4.5 V
VCC = 5.0 V
–8
VCC = 5.5 V
– 10.0
0
0
Driver output current IDO (mA)
Driver output current IDO (mA)
0
VCC = 3.6 V
10.0
VCC = 3.3 V
VCC = 3.0 V
8
6
4
2
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
5.0
–2
–4
VCC = 3.0 V
–6
VCC = 3.3 V
VCC = 3.6 V
–8
– 10.0
0
– 5.0
0
0
Driver output current IDO (mA)
5.0
Driver output current IDO (mA)
User’s Manual S13354EJ3V0UM
29
• Characteristics of driver output voltage vs. output current
(Aluminum electrolytic capacitors used)
C1 to C5 = 0.47 µF
0
VCC = 5.5 V
VCC = 5.0 V
VCC = 4.5 V
8
6
4
2
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
10.0
–2
–4
–6
VCC = 4.5 V
VCC = 5.0 V
VCC = 5.5 V
–8
– 10.0
0
– 5.0
0
0
Driver output current IDO (mA)
10.0
5.0
Driver output current IDO (mA)
VCC = 3.6 V
0
VCC = 3.0 V
8
6
4
2
Driver output voltage at “–” side VDO (V)
Driver output voltage at “+” side VDO (V)
VCC = 3.3 V
–2
–4
VCC = 3.0 V
VCC = 3.3 V
–6
VCC = 3.6 V
–8
– 10.0
0
– 5.0
0
0
Driver output current IDO (mA)
30
5.0
Driver output current IDO (mA)
User’s Manual S13354EJ3V0UM
• Characteristics of driver output voltage vs. external capacitors
(Tantalum capacitors used)
RL = 3 kΩ, TA = 25°C
(With all driver outputs)
VCC = 4.5 V
VCC = 3.0 V
10
10
8
8
VOH
6
6
4
Output Voltage (V)
Output Voltage (V)
4
VOH
2
0
–2
–4
2
0
–2
–4
–6
VOL
–8
–6
VOL
– 10
–8
0
0.1 0.2 0.3 0.4 0.5
0.6 0.7 0.8 0.9
1
– 10
0
0.1 0.2 0.3 0.4 0.5
Capacitance (µF)
0.6 0.7 0.8 0.9
1
Capacitance (µF)
User’s Manual S13354EJ3V0UM
31
9. RS-232 STANDARD
9.1 What is the RS-232 Standard?
RS-232 is a standardized serial interface that defines the mechanical and electrical characteristics for connecting
DTE (Data Terminal Equipment) and DCE (Data Communication Equipment) devices, and was developed by the EIA
(Electrical Industries Association) in the U.S.A. This standard is generally called RS-232-C.
The official name of the standard is now “EIA/TIA-232-E”, but “RS-232-C” is used in this document, as this term is
widely used.
RS-232-C specifies electrical specifications, types of signal cables and connector specifications, and is originally
referred as an interface standard to connect modems and data pins (such as PC) to each other.
The main characteristics of RS-232-C are shown below.
Characteristics of driver block
Item
Standard Value
Unit
Data transfer rate
MAX.: 20
kbps
Output voltage
MAX.: ±15 (Unloaded)
V
Output voltage
MIN.: ±5 (3 kΩ)
V
Slew rate
MAX.: 30
V/ns
Characteristics of receiver block
Item
Standard Value
Unit
Note
Load capacitance
MAX.: 2500
Threshold voltage
MAX.: ±3
V
Input resistance
3 to 7
kΩ
Input voltage
MAX.: ±25
V
pF
Note Load capacitance is determined by type and length of signal cable and others, however, cable length is not
specified in the standard.
9.2 Signal Level
Signal levels are specified in the RS-232-C standard.
Low
High
Status
Voltage level
Logical level
Driver output
Receiver input
Driver output
Receiver input
–5 to –15 V
–3 to –25 V
+5 to +15 V
+3 to +25 V
“1” (Mark level)
“0” (Space level)
The signal levels in the cable are in negative logic, reversed from logical level, in the table above.
Therefore, an inverter must be inserted for a driver to output signals to the cable and a receiver must be inserted
to input signals from the cable to match the internal logic (this is the role of ICs for RS-232 line driver/receivers).
Since there is a potential difference (2 V) between the driver output voltage and receiver input voltage, a noise
margin or magnitude drop of up to 2 V is allowed.
32
User’s Manual S13354EJ3V0UM
9.3 Basics of RS-232-C Communication
The typical waveforms of 8-bit data transfer are shown below.
“1”
PC
“0”
Space
Cable
Mark
Modem
“1”
“0”
Start Bit
Stop Bit Start Bit
Stop Bit Start Bit
Stop Bit
The following is defined in RS-232C communication.
No Transfer (Idle)
: Mark (“1”)
Transfer Start (Start Bit): Space (“0”)
Transfer Stop (Stop Bit) : Mark (“1”)
Transfer steps are as follows:
(1) In the Idle state, send Start Bit to start transfer.
(2) After data transfer is completed, send Stop Bit to stop transfer.
(3) If succeeding data is transferred, send Start Bit after Stop Bit again to transfer the data. The Idle state
must be set for periods during which no data is transferred.
User’s Manual S13354EJ3V0UM
33
10. TYPICAL APPLICATION
Microcontroller
DTR
D7
D6
D5
D4
D3
D2
D1
D0
TxD
Baud rate clock
(transfer rate)
µPD71051
Conversion from
µ PD4711B
parallel to serial RS232 level conversion
+ 10 V
1 VDD
C4 + 20
+
DC to DC
C4
C3 +
2 C1 + Converter GND 19
+
C1+
3 VCC
C4 – 18
C2
4 C1 –
V
17
– 10 V
+5V
5
16 DCON
RTS
SS
6
300
7
WR
RD
C/D
RESET
CPU
Control IC
Communication
cable
RxD
Control
Line Driver/Receiver
Control IC
CPU
CS
Data
Line Driver/Receiver
A typical application for PC to modem communication or PC to PC communication is shown below.
8
9
CTS
300
10
5.5 k
5.5 k
15
TxD
14
RTS
13
RxD
12
CTS
11
VCC
CLK
TxC
RxC
GND
The application circuits and their parameters are for reference only and are not intended for use in actual design-ins.
34
User’s Manual S13354EJ3V0UM
11. REVISION HISTORY OF PRODUCTS
The revision history of the µPD471X Series is shown below. Current part numbers are equivalent to discontinued
part numbers on package, pin configurations, and characteristics.
Therefore, customers who have been using
discontinued part numbers of the µPD471X Series can use current products without modification of board circuits etc.
However, operation checks for actual applications are necessary, because actual characteristics may differ.
Part Number
Ordering Information
(Discontinued)
Ordering Information
(Current)
µPD4711
µPD4711
µPD4711ACX/4711AGS
µPD4711B
µPD4712
µPD4712
µPD4712ACY/4712AGT
µPD4712BCY/4712BGT
µPD4712CCY/4712CGT
µPD4712DCY/4712DGT
µPD4713
µPD4713CX/4713GT
µPD4713ACX/4713AGT
µPD4714
µPD4714CY/4714GT
µPD4714ACY/4714AGT
µPD4715
µPD4715CY/4715GT
µPD4715ACY/4715AGT
Reason of Modification
Process integration due to
standardization of design.
The revision history of the µPD472X Series is shown below.
Current products are designed so as to raise the driven output performance, and as a result, the MIN. capacitance
value for external capacitors is smaller. This reduction in capacitor capacitance may enable reduction of the circuit
set size.
Part Number
µPD4721
Production
Category
(Previous
Standard)
Capacitance
of External
Capacitor
Production
Category
(Current
Standard)
Capacitance
of External
Capacitor
E
1.0 to 4.7 µF
P
0.33 to 4.7 µF
µPD4722
1.0 to 4.7 µF
0.47 to 4.7 µF
µPD4723
1.0 to 4.7 µF
0.33 to 4.7 µF
µPD4724
1.0 to 4.7 µF
0.33 to 4.7 µF
µPD4725
–
–
E
1.0 to 4.7 µF
Reason of Modification
Capacitance of external capacitors
is lowered due to improvement of
driver output capability.
(No modification)
The term “current product” as used here refers to products as of May 1998.
User’s Manual S13354EJ3V0UM
35
12. Q&A
12.1 Internal Circuit Functions
Q. How is the DCON pin actually used? (µPD471X Series)
A. Idle state (No Transfer) is defined as Mark Level (“L” Output) in the RS-232 Standard. If driver input of the
µPD471X may be unstable even if it is in Normal Operation Mode (not Standby), it can be fixed to Idle state
making driver output level at Mark Level, using the DCON pin. This function can prevent output of abnormal signal
(such as mis-recognition of the signal as Start Bit). (Refer to 6.1.2 Driver output logic.)
Q. How is the RCON pin actually used? (µPD471X Series)
A. The space level voltage range is specified from –25 V to –3 V and the mark level voltage range is specified from
+3 V to +25 V in the RS-232 Standard. Therefore, strictly speaking, the logic level is undefined when the cable
signal is 0 V.
The input threshold voltage of the µPD471X Series can be switched using the RCON pin. The product has an A
Mode, whereby the threshold voltage is set in positive, and a B Mode, whereby the threshold voltage is set in
negative in order to prevent erroneous operations even if a 0-V signal is input.
If a signal with higher noise is input, a malfunction due to the smaller hysteresis width of A Mode occurs. In this
case, B Mode must be used.
However, if a DC signal is output in a case such as when a control signal is transferred, signals of TTL level (0 to
+5 V) may be easily handled. In this case, set the threshold voltage to the A mode so that signals can be
;;;;;;;
;;;;;;;
recognized.
As described above, various signals can be flexibly handled by switching input threshold voltage depending on
the purpose. The threshold voltage range is shown below. (Refer to 6.1.4 Receiver input threshold voltage.)
Receiver input threshold voltage range
A Mode
B Mode
5V
0V
–5V
Shaded part indicates range of threshold voltage.
Q. How is the EN pin actually used? (µPD472X Series)
A. The products of the µPD472X Series (except for the µPD4721) have a mode by which receiver input can be
accepted even if it is in the Standby state. This function allows the device to use the Wake-up function, which
enables operation by receiving signals from the cable.
However, the receiver with the EN pin enabled has no hysteresis width in the Standby mode (the threshold
voltage is typically 1.5 V). In this case, it is recommended to apply a filter circuit to prevent erroneous operation
due to noise. (Refer to 6.2.3 Receiver output logic.)
36
User’s Manual S13354EJ3V0UM
12.2 Characteristics of Boosting Circuit
Q. Receiver input threshold voltage exceeds the rated value.
A. VDD and VSS boosted by the internal DC/DC converter circuit are used for the receiver input threshold voltage.
Therefore, the cause of abnormal receiver input threshold voltage may be erroneous operation of the DC/DC
converter circuit. Refer to Q. Voltage not boosted in 12.2 Characteristics of Boosting Circuit for measures
to address improper operation of the DC/DC converter circuit.
Q. How long does it take for the DC/DC converter to switch?
+
–
+
–
A. Switching time can be determined by measuring C1 , C1 , C4 , and C4 with an oscilloscope or other device. It is
designed so that the switching time is approximately 5 µs.
However, the switching time is fairly changed
depending on dispersions of internal Cs and Rs which determine the time constant. Dispersion of approximately
half to double of the designed value should be taken into account.
Q. Can any current be taken out from the boosted power pins (VDD and VSS)?
A. The boosted power pins are voltage output pins with voltages internally boosted. They are used for driver output,
setting of receiver input threshold voltage or others. Therefore, do not directly connect any loads to these pins.
Just for reference, a typical characteristic when current is taken out from the VDD pin of the µPD4721 is shown in
the figure below. (Refer to 7. NOTES FOR USE.)
A typical characteristic of VDD vs. Takeout Current when current is taken out from VDD
(Conditions: TA = 25°C, VCC = 3.3 V, C1 to C5 = 0.33 µF, DOUT Full Load RL = 3 kΩ)
8.20
8.15
8.10
VDD (V)
8.05
8.00
7.95
7.90
7.85
7.80
0
50
100
150
200
250
300
Current (µA)
User’s Manual S13354EJ3V0UM
37
Q. Are there any problems if two ICs are used with one common capacitor?
A. DC/DC converters in the µPD471X Series and µPD472X Series are not designed expecting that two circuits are
used with one common capacitor. In addition, because switching timings of capacitors cannot be externally
synchronized, expected boosting operation cannot be achieved. Always use one capacitor for a single IC.
Q. Voltage not boosted.
A. There are several causes. Refer to the following measures.
1.
Noise is superposed on the power supply pin.
→ Connect a bypass capacitor between VCC and GND for stabilizing. Locate the capacitor in the vicinity of
the VCC pin to minimize the wiring length.
2.
External voltage is applied to the driver output pin before the power is turned on.
→ Internal DC/DC converter circuit may not boost the voltage, if other voltage is applied to the driver output
pin from external circuit before the power is turned on.
Even if a different voltage within the rated value range is applied to the driver output pins, there is no
operational problem if the IC is in operation. However, for functionality purposes, this IC is not designed
expecting that another voltage will be applied to the driver output pins from an external circuit. Therefore,
ensure that any other voltage is not applied to driver output pins from an external circuit.
12.3 External Capacitors
Q. What is the withstand voltage of external capacitors?
A. As specified in the data sheet, the following capacitors with specified withstand voltages are recommended.
Series
Withstand Voltage of
External Capacitor
µPD471X
16 V
µPD472X
20 V
A maximum of 10 V is theoretically applied to an external capacitor as specified in the table in DC/DC converter
block in Sections 6.1.1 and 6.2.1. However, since noise may be generated at switching, voltages with some
margins (16 V or 20 V) are recommended.
Q. What will happen if capacitors with polarity such as Tantalum capacitor are connected in reversed polarity?
A. If a capacitor with polarity is connected in the opposite direction from the connection diagram, the capacitor may
be shorted.
Connect capacitors based on the connection diagram when connecting capacitors with polarity.
If the capacitor is shorted, refer to the next item “Q. Is the IC damaged if the capacitor is shorted?”
Q. Is the IC damaged if the capacitor is shorted?
A. High current may flow between VDD and VCC or between VCC and GND if the capacitor is shorted. This high
current may destroy the capacitor. Absolute maximum rating of the input current on each pin of the µPD472X
Series is specified as ±20 mA. Therefore, excessive current over this value may destroy capacitors.
38
User’s Manual S13354EJ3V0UM
12.4 Transfer Rate
Q. Is the operation guaranteed when using a maximum transfer rate of 115 kbps?
A. The maximum transfer rate of the µPD471X Series and µPD472X Series is specified as 20 kbps. Therefore, their
operation is not guaranteed with a transfer rate over 20 kbps.
The actual transfer rate depends on the driver output load (such as signal cable length). If they are used for
applications with a lower load, such as when the cable length is extremely short, transfer with rate of over 20
kbps is potentially possible.
For your reference, actually measured values of slew rate and driver output voltage vs. transfer rate are shown
on the following pages.
User’s Manual S13354EJ3V0UM
39
: µPD4722
Measured on
Measuring conditions : TA = 25°C, VCC = 3 V, C1 – C5 = 1µF, RL = 3 kΩ, with all drivers output
Transfer rate - slew rate (at rising edge)
0
SR (–) (V/µ s)
–2
–4
2500 pF
1500 pF
–6
500 pF
0 pF
–8
– 10
– 12
10
100
1000
Transfer Rate (kbps)
Transfer rate - slew rate (at falling edge)
12
SR (+) (V/µ s)
10
2500 pF
8
1500 pF
6
500 pF
0 pF
4
2
0
10
100
Transfer Rate (kbps)
40
User’s Manual S13354EJ3V0UM
1000
Transfer rate - driver output voltage (with output “H”)
10
8
6
VOH (V)
2500 pF
1500 pF
500 pF
4
0 pF
2
0
10
100
1000
Transfer Rate (kbps)
Transfer rate - driver output voltage (with output “L”)
0
–2
2500 pF
VOL (V)
–4
1500 pF
500 pF
–6
0 pF
–8
– 10
10
100
1000
Transfer Rate (kbps)
User’s Manual S13354EJ3V0UM
41
12.5 Reliability
Q. What is ESD withstand voltage?
A. These series have passed the ESD (Electrostatic Discharge) test (MIL Method, ESD Test by EIAJ Method)
defined by NEC Electronics. Confirm the measured values in the ESD test by obtaining the Result Report of
Reliability Testing. Request it from Reliability and Quality Control Dept. through your NEC Electronics sales
representative.
Q. How are ESD protection circuits configured?
A. A protection circuit for the driver output block can be configured with a combination of Zener diodes. A sample
circuit for protection is shown below. VZ of the Zener diodes should be lower than the rated voltage of the driver
output (25 V) and higher than the output voltage (up to 10 V).
(Refer to 7. NOTES FOR USE.)
Example of ESD Protection Circuit
µ PD471X and µ PD472X
DIN
DOUT
Zener diode
Output voltage (10 V) < VZ < 25 V
Q. What will happen if driver outputs of the transfer source and the transfer destination conflict with each other?
A. Over current between outputs may flow depending on the status of their driver outputs. For example, if the
output of source is “H” and the output of destination is “L”, a high current flows from the source driver to the
destination driver.
In this case, the internal DC/DC converter may not be able to properly boost the voltage, and erroneous
operation may result.
Therefore, do not connect driver output pins to each other.
42
User’s Manual S13354EJ3V0UM
12.6 Marking, Packages and Others
Q. Give me information on current marking.
A. The markings of the µPD4714A and µPD4722 (on May 1998) are shown below.
DIP package (µPD4714ACY: µPD471X Series)
JAPAN
D4714AC
Lot number
SOP package (µPD4714AGT: µPD471X Series)
JAPAN
D4714A
Pin 1 index
Lot number
Only µPD4711BGX has different marking for part number.
Part number: D4711BG
SSOP package (µPD4722GS-GJG: µPD472X Series)
JAPAN
D4722GS
Pin 1 index
Lot number
Only marking of product name of µ PD4721GX-GJG is different from others.
Part number: D4721
User’s Manual S13354EJ3V0UM
43
Q. Give me information on the packaged quantity in a magazine and a reel
A. Refer to the SEMICONDUCTOR SELECTION GUIDE (X13769X) for details on magazines and reels.
The packaged quantities of each part number and package type is shown in the table below.
DIP package (magazine)
Part Number
Packaged Quantity
µPD4711BCX
18
µPD4712CCY/DCY
13
µPD4713ACX
15
µPD4714ACY
13
µPD4715ACY
13
SOP package (adhesive taping)
Part Number
Packaged Quantity
µPD4711BGS
1500
µPD4712CGT/DGT
µPD4713AGT
µPD4714AGT
µPD4715AGT
SOP package (embossed taping)
Part Number
Packaged Quantity
Taping Specification
µPD4711BGS
2500
24 mm width tape
µPD4712CGT/DGT
1500
µPD4713AGT
µPD4714AGT
µPD4715AGT
SSOP package
Part Number
µPD4721GS-GJG
Packaged Quantity
Taping Specification
2500
16 mm width tape
µPD4722GS-GJG
µPD4723GS-GJG
µPD4724GS-GJG
µPD4726GS-GJG
44
24 mm width tape
User’s Manual S13354EJ3V0UM
APPENDIX ELECTRICAL SPECIFICATIONS
The typical electrical specifications of the µPD471X Series and µPD472X Series are shown in the tables below.
Refer to the relevant document for details.
Appendix 1. Main Characteristics of µPD471X Series (Ex.: µPD4714A)
Electrical specifications (common) (Unless otherwise specified, VCC = +5 V ± 10%, TA = –20 to +80°C, C1 to C5 = 22 µF)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
Circuit current
ICC1
VCC = +5 V, No load, RIN pin open,
(STBY pin open)
7.0
18.0
mA
Circuit current
ICC2
VCC = +5 V, RL = 3 kΩ (DOUT), DIN = GND,
RIN, ROUT pin open (STBY pin open)
23.0
40.0
mA
50
120
µA
Circuit current at standby
ICC
(Standby)
Standby high level input
voltage
VIH
(Standby)
Standby low level input
voltage
VIL
(Standby)
VCC = +5 V, No load, RIN pin open
(STBY pin high)
2.0
V
0.8
V
Electrical specifications (driver) (Unless otherwise specified, VCC = +5 V ± 10%, TA = –20 to +80°C, C1 to C5 = 22 µF)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
0.8
V
Low-level input voltage
VIL
High-level input voltage
VIH
2.0
Low-level input current
IIL
0
–1.0
µA
High-level input current
IIH
0
1.0
µA
Output voltage
VDO
VCC = +5.0 V, RL = ∞, TA = 25°C
V
±5.5
V
VCC = +4.5 V, RL = 3 kΩ
±5.0
V
ISC
VCC = +5.0 V, from GND
Slew rate
SR
CL = 10 pF, RL = 3 to 7 kΩ
CL = 2500 pF, RL = 3 to 7 kΩ
tPHL
±9.7
VCC = +5.0 V, RL = 3 kΩ
Output short-circuit current
Transfer delay time
V
±15
±40
mA
1.5
9
30
V/µs
1.5
5
30
V/µs
RL = 3 kΩ, CL = 2500 pF
0.8
µs
500
Ω
tPLH
Output resistance
RO
VCC = VDD = VSS = 0 V, VOUT = ±2 V
Standby output transition
time
tDAZ
RL = 3 kΩ, CL = 2500 pF
4
10
µs
Standby output transition
time
tDZA
RL = 3 kΩ, CL = 2500 pF
25
50
ms
User’s Manual S13354EJ3V0UM
300
45
Electrical specifications (receiver) (Unless otherwise specified, VCC = +5 V ± 10%, TA = –20 to +80°C, C1 to C5 = 22 µF)
Parameter
Symbol
Condition
Low-level output voltage
VOL
IOUT = 4 mA
High-level output voltage
VOH
IOUT = –4 mA
Low-level input voltage
VOL
RCON pin
High-level input voltage
VOH
RCON pin
Propagation delay time
tPHL
RL = 1 kΩ, CL = 150 pF
MIN.
TYP.
MAX.
Unit
0.4
V
V
VCC – 0.8
0.8
2.0
V
V
µs
0.13
tPLH
Input resistance
RI
Input open circuit voltage
VIO
Input threshold A mode only.
Threshold A mode
(RCON pin Low)
VIH
VCC = +5 V
1.7
VIL
VCC = +5 V
VH
Threshold B mode
(RCON pin High)
3
5
7
kΩ
0.5
V
2.3
2.7
V
0.7
1.1
1.7
V
VCC = +5 V (Hysteresis width)
0.5
1.2
1.8
V
VIH
VCC = +5 V
1.6
2.2
2.6
V
VIL
VCC = +5 V
–0.4
–1.8
–3.0
V
VH
VCC = +5 V (Hysteresis width)
2.6
4.0
5.4
V
Standby output transition
time
tDAZ
0.4
1
µs
Standby output transition
time
tDZA
1.0
10
ms
46
User’s Manual S13354EJ3V0UM
Appendix 2. Main Characteristics of µPD472X Series (Ex.: µPD4724)
Electrical specifications (common) (Unless otherwise specified, TA = –40 to +85°C, C1 to C5 = 1 µF)
Parameter
Circuit current
Circuit current
Circuit current at standby
(Standby mode 1)
Circuit current at standby
(Standby mode 2)
Symbol
ICC1
ICC2
ICC3
ICC4
Condition
TYP.
MAX.
Unit
VCC = +3.3 V, No load, RIN pin open,
STBY = H
7.5
15
mA
VCC = +5.0 V, No load, RIN pin open,
STBY = H
5.5
11
mA
VCC = +3.3 V, RL = 3 kΩ (DOUT), DIN = GND,
RIN, ROUT pin open, STBY = H
25
35
mA
VCC = +5.0 V, RL = 3 kΩ (DOUT), DIN = GND,
RIN, ROUT pin open, STBY = H
19
28
mA
VCC = +3.3 V, No load, DIN, RIN pin open
STBY = L, EN = L, TA = 25°C
1
3
µA
VCC = +5.0 V, No load, DIN, RIN pin open
STBY = L, EN = L, TA = 25°C
2
5
µA
VCC = +3.3 V, No load, DIN, RIN pin open
STBY = L, EN = H, TA = 25°C
1
3
µA
VCC = +5.0 V, No load, DIN, RIN pin open
STBY = L, EN = H, TA = 25°C
2
5
µA
High-level input voltage
VIH
VCC = +3.0 to +5.5 V, STBY, VCHA, EN pin
Low-level input voltage
VIL
VCC = +3.0 to +5.5 V, STBY, VCHA, EN pin
MIN.
2.4
V
0.6
V
MAX.
Unit
0.8
V
Electrical specifications (driver) (Unless otherwise specified, TA = –40 to +85°C, C1 to C5 = 1 µF)
3-V mode (Unless otherwise specified, VCHA = H, VCC = 3.0 to 3.6 V)
Parameter
Symbol
Condition
MIN.
TYP.
Low-level input voltage
VIL
High-level input voltage
VIH
Low-level input current
IIL
VCC = +3.6 V, VI = 0 V
–25
µA
High-level input current
IIH
VCC = +3.6 V, VI = +3.6 V
1.0
µA
Output voltage
VDO
2.0
VCC = +3.3 V, RL = ∞, TA = 25°C
VCC = +3.3 V, RL = 3 kΩ
±5.0
VCC = +3.0 V, RL = 3 kΩ, TA = 25°C
±5.0
Output short-circuit current
ISC
VCC = +3.3 V, from GND
Slew rate
SR
CL = 10 pF, RL = 3 to 7 kΩ
CL = 2500 pF, RL = 3 to 7 kΩ
Transfer delay time
tPHL
V
±9.5
V
±6.0
V
V
±40
mA
3.0
30
V/µs
3.0
30
V/µs
RL = 3 kΩ, CL = 2500 pF
µs
2.5
tPLH
Output resistance
RO
VCC = VDD = VSS = 0 V, VOUT = ±2 V
Standby output transition time
tDAZ
RL = 3 kΩ, CL = 2500 pF
4
10
µs
Standby output transition time
tDZA
RL = 3 kΩ, CL = 2500 pF
1
3
ms
Power on output transition time
tPRA
RL = 3 kΩ, CL = 2500 pF
1
3
ms
User’s Manual S13354EJ3V0UM
Ω
300
47
Electrical specifications (driver) (Unless otherwise specified, TA = –40 to +85°C, C1 to C5 = 1 µF)
5-V mode (Unless otherwise specified, VCHA = L, VCC = 5.0 V ±10%)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
0.8
V
Low-level input voltage
VIL
High-level input voltage
VIH
Low-level input current
IIL
VCC = +5.5 V, VI = 0 V
–40
µA
High-level input current
IIH
VCC = +5.5 V, VI = +5.5 V
1.0
µA
Output voltage
VDO
Output short-circuit current
ISC
Slew rate
SR
Transfer delay time
tPHL
2.0
VCC = +5.0 V, RL = ∞, TA = 25°C
V
±9.7
V
VCC = +5.0 V, RL = 3 kΩ
±6.0
V
VCC = +4.5 V, RL = 3 kΩ
±5.0
V
±40
VCC = +5.0 V, from GND
mA
CL = 10 pF, RL = 3 to 7 kΩ
4.0
30
V/µs
CL = 2500 pF, RL = 3 to 7 kΩ
4.0
30
V/µs
RL = 3 kΩ, CL = 2500 pF
µs
2
tPLH
Output resistance
RO
VCC = VDD = VSS = 0 V, VOUT = ±2 V
Ω
Standby output transition time
tDAZ
RL = 3 kΩ, CL = 2500 pF
4
10
µs
Standby output transition time
tDZA
RL = 3 kΩ, CL = 2500 pF
0.5
1
ms
Power on output transition time
tPRA
RL = 3 kΩ, CL = 2500 pF
0.5
1
ms
300
Electrical specifications (receiver) (Unless otherwise specified, VCC = 3.0 to 5.5 V, TA = –40 to +85°C, C1 to C5 = 1 µF)
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
0.4
V
Low level-output voltage
VOL1
IOUT = 4 mA, STBY = H
High level-output voltage
VOH1
IOUT = –4 mA, STBY = H
Low level-output voltage
VOL2
IOUT = 4 mA, STBY = L
High level-output voltage
VOH2
IOUT = –4 mA, STBY = L
Transfer delay time
tPHL
RIN → ROUT, CL = 150 pF, VCC = +3.0 V
0.2
µs
RIN → ROUT, CL = 150 pF, VCC = +3.0 V
0.1
µs
RIN → ROUT, CL = 150 pF, VCC = +3.0 V
100
(STBY = H)
tPLH
Transfer delay time
tPHL
(STBY = L)
tPLH
Transfer delay time
tPHA
(STBY = L)
tPAH
V
VCC – 0.4
0.5
V
VCC – 0.5
Input resistance
RI
Input open circuit voltage
VIO
3
Threshold
VIH
VCC = +3.0 to +5.5 V
1.7
(STBY = H)
VIL
VCC = +3.0 to +5.5 V
0.7
VH
VCC = +3.0 to +5.5 V (Hysteresis width)
Threshold
VIH
VCC = +3.0 to +5.5 V, RIN4, RIN5
(STBY = L, EN = H)
VIL
VCC = +3.0 to +5.5 V, RIN4, RIN5
Standby output transition
tDAH
V
5.5
300
ns
7
kΩ
0.5
V
2.3
2.7
V
1.1
1.7
V
0.5
1.2
1.8
2.7
1.5
V
V
1.5
0.7
V
0.2
3
µs
VCHA = H (3-V mode)
0.6
3
ms
VCHA = L (5-V mode)
0.3
1
ms
VCHA = H (3-V mode)
1
3
ms
VCHA = L (5-V mode)
0.5
1
ms
time
Standby output transition
tDHA
time
Power on reset release
time
48
tPRA
User’s Manual S13354EJ3V0UM