STMicroelectronics MC1489AD Quad line receiver Datasheet

MC1489
MC1489A
QUAD LINE RECEIVERS
■
■
■
■
INPUT RESISTANCE –3k to 7kΩ
INPUT SIGNAL RANGE – ± 30V
INPUT THRESHOLD HYSTERESIS BUILT-IN
RESPONSE CONTROL:
a) LOGIC THRESHOLD SHIFTING
b) INPUT NOISE FILTERING
DESCRIPTION
The MC1489 monolithic quad line receivers are
designed to interface data terminal equipment
with data communications equipment in
conformance with the specifications of EIA
Standard N° RS232C.
DIP
SOP
SCHEMATIC DIAGRAM
September 2003
1/13
MC1489/MC1489A
PIN CONFIGURATION (top view)
ORDERING CODES
DIP14
SO14
SO14 (TAPE & REEL)
MC1489P
MC1489AP
MC1489D1
MC1489D1013TR
MC1489AD1013TR
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
VS
Power Supply Voltage
10
VI
Input Voltage Range
±30
V
IOL
Output Load Current
20
mA
PTOT
Power Dissipation
Tamb
Operating Ambient Temperature
Tstg
Storage Temperature Range
1
W
0 to 75
°C
-65 to 150
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
2/13
MC1489/MC1489A
ELECTRICAL CHARACTERISTICS
Response Control Pin in Open; VS = 5V, Tamb = 0 to 75°C, unless otherwise specified.
Symbol
IIH
IIL
Parameter
Positive Input Current
Negative Input Current
Test Conditions
VIH = 25 V
3.6
VIH = 3 V
0.43
VIL = - 25 V
-3.6
VIL = - 3 V
-0.43
Input Turn-On Threshold
Voltage
Tamb = 25°C, VOL ≤ 0.45 V
IL = 10 mA
Tamb = 25°C, VOL ≥ 2.5 V IL = -0.5 mA
VOH
Input Turn-Off Threshold
Voltage
Output Voltage High
VOL
Output Voltage Low
IOS
IS
Output Short Circuit
Current
Power Supply Current
PC
Power Consumption
VIH
VIL
Min.
for MC1489
for MC1489A
1
1.75
Typ.
1.95
0.75
VIH = 0.75 V, IL = -0.5 mA
2.5
IL = 0.5 mA Input Open Circuit
2.5
4
Max.
Unit
8.3
mA
-8.3
mA
1.5
2.25
V
1.25
V
5
V
4
5
0.2
0.45
V
-3
-4
mA
All gates "ON", IO = 0 mA, VIH = 5 V
16
26
mA
VIH = 5 V
80
130
mW
Typ.
Max.
Unit
VIL = 3 V, IL = 10 mA
SWITCHING CHARACTERISTICS
VS = 5V, Tamb = 25°C, (see Figure 1)
Symbol
Parameter
Test Conditions
Min.
tPLH
Propagation Delay Time
RL = 3.9 KΩ
25
85
ns
tTHL
Rise Time
RL = 3.9 KΩ
120
175
ns
tPHL
Propagation Delay Time
RL = 390 Ω
25
50
ns
tTHL
Fall Time
RL = 390 Ω
10
20
ns
TEST CIRCUITS
Figure 1 : Switching Response
3/13
MC1489/MC1489A
Figure 2 : Response Control Node
C: capacitor is for noise filtering
Figure 3 : Input Current
Figure 4 : Output Short-Circuit Current
4/13
MC1489/MC1489A
Figure 5 : Output Voltage and Input Threshold Voltage
Figure 6 : Power Supply Currents
5/13
MC1489/MC1489A
TYPICAL APPLICATIONS:
Figure 7 : RS232C Data Transmission
TYPICAL CHARACTERISTICS VS = 5V, Tamb = 25°C, unless otherwise specified
Figure 8 : Input Current vs Input Voltage
6/13
Figure 9 : MC1489 Input Threshold Voltage
Adjustment
MC1489/MC1489A
Figure 10 : MC1489A Input Threshold Voltage
Adjustment
Figure 12 : Input Threshold vs Power Supply
Voltage
Figure 11 : Input Threshold vs Temperature
7/13
MC1489/MC1489A
APPLICATION INFORMATION
The Electronic Industries Association (EIA) has released the RS-232C specification detailing the
requirements for the interface between data processing equipment and data communications equipment.
This standard specifies not only the number and type of interface leads, but also the voltage levels to be
used. The MC1488 quad driver and its companion circuit, the MC1489 quad receiver, provide a complete
interface system between DTL or TTL logic levels and the RS-232C defined levels. The RS-232C
requirements as applied to receivers are discussed herein.
The required input impedance is defined as between 3000Ω and 7000Ω for input voltages between 3.0
and 25V in magnitude; and any voltage on the receiver input in an open circuit condition must be less than
2.0V in magnitude. The MC1489 circuits meet these requirements with a maximum open circuit voltage of
one VBE.
The receiver shall detect a voltage between - 3.0 and - 25V as a Logic "1" and inputs between + 3.0 and
+ 2.5V as a Logic "0". On some interchange leads, an open circuit of power "OFF" condition (300Ω or
more to ground) shall be decoded as an "OFF" condition or Logic "1". For the reason, the input hysteresis
thresholds of the MC1489 circuits are all above ground. Thus an open or grounded input will cause the
same output as a negative or Logic "1" input.
DEVICE CHARACTERISTICS
The MC1489 interface receivers have internal feedback from the second stage to the input stage
providing input hysteresis for noise rejection. The MC1489 input has typical turn-on voltage of 1.25V and
turn-off of 1.0 V for a typical hysteresis of 250mV. The MC1489A has typical turn-on of 1.95V and turn-off
of 0.8V for typically 1.15V of hysteresis.
Each receiver section has an external response control node in addition to the input and output pins,
thereby allowing the designer to vary the input threshold voltage levels. A resistor can be connected
between this node and an external power supply. Figures 2, 4 and 5 illustrate the input threshold voltage
shift possible through this technique.
This response node can also be used for the filtering of the high-frequency, high-energy noise pulses.
Figures 9 and 10 show typical noise-pulse rejection for external capacitors of various sizes.
These two operations on the response node can be combined or used individually for may combinations
of interfacing applications. The MC1489 circuits are particularly useful for interfacing between MOS
circuits and MDTL/MTTL logic systems. In this application, the input threshold voltages are adjusted. (with
the appropriate supply and resistor values) to fall in the center of the MOS voltage logic levels (see Figure
11).
The response node may also be used as the receiver input as long as the designer realizes that he may
not drive this node with a low impedance source to a voltage greater than one diode above ground or less
than one diode below ground. This feature is demonstrated in Figure 12 where two receivers are slaved
to the same line that must still meet the RS-232C impedance requirement.
Figure 13 : Typical Turn-on Threshold vs
Capacitance from Response Control Pin to GND
8/13
Figure 14 : Typical Turn-on Threshold vs
Capacitance from Response Control Pin to GND
MC1489/MC1489A
Figure 15 : Typical Paralleling of Two MC1489/A Receivers to Meet RS-232C
9/13
MC1489/MC1489A
Plastic DIP-14 MECHANICAL DATA
mm.
inch
DIM.
MIN.
a1
0.51
B
1.39
TYP
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.055
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
15.24
0.600
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
1.27
0.130
2.54
0.050
0.100
P001A
10/13
MC1489/MC1489A
SO-14 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.003
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45˚ (typ.)
D
8.55
8.75
0.336
0.344
E
5.8
6.2
0.228
0.244
e
1.27
0.050
e3
7.62
0.300
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.68
0.026
8 ˚ (max.)
PO13G
11/13
MC1489/MC1489A
Tape & Reel SO-14 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
MAX.
MIN.
330
13.2
TYP.
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
12/13
TYP
0.504
22.4
0.519
0.882
Ao
6.4
6.6
0.252
0.260
Bo
9
9.2
0.354
0.362
Ko
2.1
2.3
0.082
0.090
Po
3.9
4.1
0.153
0.161
P
7.9
8.1
0.311
0.319
MC1489/MC1489A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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All other names are the property of their respective owners
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13/13
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