LINER LTC1338 5v low power rs232 5-driver/3-receiver transceiver Datasheet

LTC1338
5V Low Power RS232
5-Driver/3-Receiver Transceiver
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DESCRIPTIO
FEATURES
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■
■
Low Supply Current: 500µA
0.2µA Supply Current in SHUTDOWN
50µA Supply Current in RECEIVER ALIVE Mode
ESD Protection Over ±10kV
Operates from a Single 5V Supply
Uses Small Capacitors: 0.1µF
Operates to 120k Baud
Three-State Outputs Are High Impedance When Off
Output Overvoltage Does Not Force Current
Back into Supplies
RS232 I/O Lines Can Be Forced to ±25V
Without Damage
Flowthrough Architecture
The LTC1338 is a 5-driver/ 3-receiver RS232 transceiver with very low supply current. In the no load
condition, the supply current is only 500µA. The charge
pump only requires four 0.1µF capacitors.
In SHUTDOWN mode, the supply current is further
reduced to 0.2µA. In RECEIVER ALIVE mode, all three
receivers are kept alive and the supply current is 50µA.
All RS232 outputs assume a high impedance state in
SHUTDOWN and with the power off.
The LTC1338 is fully compliant with all data rate and
overvoltage RS232 specifications. The transceiver can
operate up to 120k baud with a 2500pF, 3kΩ load. Both
driver outputs and receiver inputs can be forced to
±25V without damage, and can survive multiple ±10kV
ESD strikes.
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APPLICATI
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S
Battery-Powered Modems
Battery-Powered DCE
Notebook Computers
Palmtop Computers
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TYPICAL APPLICATI
Supply Current
5-Drivers/3-Receivers with SHUTDOWN
C1
0.1µF
C2
0.1µF
DRIVER 1 OUT
DRIVER 2 OUT
RX1 IN
DRIVER 3 OUT
RX2 IN
DRIVER 4 OUT
RX3 IN
DRIVER 5 OUT
RX ENABLE
NC
2
LTC1338
V–
C4
0.1µF
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C3
0.1µF
1200
1.2
1000
1.0
DRIVER 1 IN
DRIVER 2 IN
RX1 OUT
DRIVER 3 IN
RX2 OUT
DRIVER 4 IN
0.8
800
QUIESCENT
CURRENT
600
0.6
0.4
400
SHUTDOWN
CURRENT
200
SHUTDOWN CURRENT (µA)
VCC
28
1
QUIESCENT CURRENT (µA)
V+
0.2
RX3 OUT
DRIVER 5 IN
0
–40
GND
DRIVER ENABLE
NC
–20
0
20
40
60
TEMPERATURE (°C)
TEST CONDITION:
VCC = 5V, ALL DRIVER INPUTS TIED TO VCC.
80
0
100
LTC1338 • TA02
LTC1338 • TA01
1
LTC1338
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ABSOLUTE
PACKAGE/ORDER I FOR ATIO
RATI GS
(Note 1)
Supply Voltage (VCC) ................................................ 6V
Input Voltage
Driver ....................................... – 0.3V to V CC + 0.3V
Receiver ............................................... – 25V to 25V
Driver/Receiver Enable Pin ........ – 0.3V to VCC + 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to VCC + 0.3V
Short Circuit Duration
V + ................................................................... 30 sec
V – ................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
Commercial (LTC1338C) ........................ 0°C to 70°C
Industrial (LTC1338I) ........................ – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
DC ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
Any Driver
Output Voltage Swing
3k to GND
Logic Input Voltage Level
Logic Input Current
Output Short-Circuit Current
Output Leakage Current
Any Receiver
Input Voltage Thresholds
Hysteresis
Input Resistance
Output Voltage
Output Short-Circuit Current
Output Leakage Current
Power Supply Generator
V + Output Voltage
V – Output Voltage
Supply Rise Time
2
TOP VIEW
V+
ORDER PART
NUMBER
28 V –
1
VCC 2
27 C2 +
C1+
3
26 C2 –
C1–
4
25 DR1 IN
DR1 OUT 5
24 DR2 IN
DR2 OUT 6
23 RX1 OUT
RX1 IN 7
22 DR3 IN
DR3 OUT 8
21 RX2 OUT
RX2 IN 9
20 DR4 IN
DR4 OUT 10
19 RX3 OUT
RX3 IN 11
18 DR5 IN
DR5 OUT 12
17 GND
RX ENABLE 13
16 DR ENABLE
NC 14
15 NC
N PACKAGE
G PACKAGE
28-LEAD PLASTIC DIP
28-LEAD SSOP
S PACKAGE
28-LEAD PLASTIC SOL
TJMAX = 125°C, θJA = 96°C/W (G)
TJMAX = 125°C, θJA = 56°C/W (N)
TJMAX = 125°C, θJA = 85°C/W (S)
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
MIN
TYP
●
●
5.0
– 5.0
Input Low Level (VOUT = High)
Input High Level (VOUT = Low)
0 ≤ VIN ≤ VCC
VOUT = 0V
SHUTDOWN, VOUT = ±20V (Note 3)
●
●
2.0
7.0
– 6.5
1.4
1.4
Input Low Threshold
Input High Threshold
●
●
0.8
●
0.1
3
– 10V ≤ VIN ≤ 10V
Output Low, IOUT = – 1.6mA (VCC = 5V)
Output High, IOUT = 160µA (VCC = 5V)
Sinking Current, VOUT = VCC
SHUTDOWN, 0 ≤ VOUT ≤ VCC (Note 3)
IOUT = 0mA
IOUT = 12mA
IOUT = 0mA
IOUT = – 12mA
SHUTDOWN to Turn-On
LTC1338CG
LTC1338CN
LTC1338CS
LTC1338IG
LTC1338IN
LTC1338IS
Positive
Negative
±12
±10
●
●
0.8
±5
●
●
●
MAX
3.5
– 15
1.3
1.7
0.4
5
0.2
4.8
– 40
1
8.0
7.5
– 8.0
– 7.0
0.2
±500
2.4
1
7
0.4
10
UNITS
V
V
V
V
µA
mA
µA
V
V
V
kΩ
V
V
mA
µA
V
V
V
V
ms
LTC1338
DC ELECTRICAL CHARACTERISTICS VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
PARAMETER
Power Supply
VCC Supply Current
CONDITIONS
No Load (All Driver VIN = VCC)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Driver VIN = 0V)(Note 2) 0°C ≤ TA ≤ 70°C
No Load (All Driver VIN = VCC)(Note 2) – 40°C ≤ TA ≤ 85°C
No Load (All Driver VIN = 0V)(Note 2) – 40°C ≤ TA ≤ 85°C
RECEIVER ALIVE Mode (Note 4)
SHUTDOWN (Note 3)
Supply Leakage Current (VCC)
Driver/Receiver Enable Threshold Low
Driver/Receiver Enable Threshold High
MIN
TYP
MAX
1.0
1.5
1.5
2.0
80
10
0.8
2.0
0.5
1.0
0.5
1.0
50
0.2
1.4
1.4
TYP
8
5
2
2
0.3
0.2
MAX
30
●
●
●
●
AC CHARACTERISTICS
PARAMETER
Slew Rate
mA
mA
mA
mA
µA
µA
V
V
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless otherwise noted.
CONDITIONS
RL = 3k, CL = 51pF
RL = 3k, CL = 2500pF
t HLD (Figure 1)
t LHD (Figure 1)
t HLR (Figure 2)
t LHR (Figure 2)
Driver Propagation Delay
(TTL to RS232)
Receiver Propagation Delay
(RS232 to TTL)
UNITS
MIN
3
●
●
●
●
The ● denotes specifications which apply over the operating temperature
range of 0°C to 70°C or – 40°C to 85°C.
Note 1: Absolute maximum ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded. The VDRIVER ENABLE and VRECEIVER ENABLE = VCC.
UNITS
V/µs
V/µs
µs
µs
µs
µs
3.5
3.5
0.8
0.8
Note 3: Supply current and leakage current measurements in SHUTDOWN
are performed with VDRIVER ENABLE and VRECEIVER ENABLE = 0V.
Note 4: Supply current measurement in RECEIVER ALIVE mode is
performed with VDRIVER ENABLE = 0V and VRECEIVER ENABLE = VCC.
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Output Voltage
Receiver Input Thresholds
10
6
OUTPUT HIGH
VCC = 5V
4
2
0
–2
OUTPUT LOW
VCC = 4.5V
–4
–6
–8
–40
1.8
VTH
1.6
1.4
VCC = 5V
RL = 3k
CL = 2500pF
5 DRIVERS ACTIVE
50
2.0
VCC = 4.5V
SUPPLY CURRENT (mA)
RL = 3k
THRESHOLD VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
8
Supply Current vs Data Rate
60
2.2
VTL
40
30
20
10
1.2
VCC = 5V
–20
20
0
60
40
TEMPERATURE (°C)
80
100
LTC1338 • TPC01
1.0
–40 –20
0
40
20
60
0
TEMPERATURE (˚C)
80
100
LTC1338 • TPC02
0
20
80
60
100
40
DATA RATE (k BAUD)
120
140
LTC1338 • TPC03
3
LTC1338
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TYPICAL PERFOR A CE CHARACTERISTICS
VCC Supply Current
Driver Leakage in Shutdown
30
20
5 DRIVERS LOADED
RL = 3k
18
SHORT-CIRCUIT CURRENT (mA)
25
40
LEAKAGE CURRENT (µA)
SUPPLY CURRENT (mA)
Driver Short-Circuit Current
50
20
15
10
1 DRIVER LOADED
RL = 3k
5
VOUT = –20V
30
20
VOUT = 20V
10
16
ISC–
14
ISC+
12
10
8
6
4
0
–40 –20
40
20
60
0
TEMPERATURE (°C)
80
100
0
–40 –20
40
20
0
60
TEMPERATURE (°C)
80
100
0
–40
LTC1338 • TPC05
LTC1338 • TPC04
Receiver Short-Circuit Current
–20
20
0
60
40
TEMPERATURE (°C)
80
100
LTC1338 • TPC06
Driver Output Waveforms
Receiver Output Waveforms
SHORT-CIRCUIT CURRENT (mA)
60
DRIVER
OUTPUT
RL = 3k
CL = 2500pF
DRIVER
OUTPUT
RL = 3k
50
40
ISC–
RECEIVER
OUTPUT
CL = 50pF
INPUT
30
INPUT
ISC+
20
LTC1338 • TPC08
10
–40 –20
40
20
0
60
TEMPERATURE (°C)
80
LTC1338 • TPC09
100
LTC1338 • TPC07
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PI FU CTIO S
VCC: 5V Input Supply Pin. Supply current less than 0.2µA
in the SHUTDOWN mode. This pin should be decoupled
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
RECEIVER ENABLE: TTL/CMOS Compatible Enable Pin.
Refer to Table 1 for its functional description. This pin can
not float.
DRIVER ENABLE: TTL/CMOS Compatible Enable Pin. Refer to Table 1 for its functional description. This pin can not
float.
V +: Positive Supply Output (RS232 Drivers). V + ≅ 2VCC –
1V. This pin requires an external capacitor C = 0.1µF for
4
charge storage. The capacitor may be tied to ground or 5V.
With multiple devices, the V + and V – pins may be paralleled into common capacitors. For large numbers of
devices, increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V –: Negative Supply Output (RS232 Drivers). V – ≅ 2VCC
– 1.5V. This pin requires an external capacitor C = 0.1µF for
charge storage.
C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These
pins require two external capacitors C = 0.1µF: one from
C1+ to C1–, and another from C2+ to C2–. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
LTC1338
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PI FU CTIO S
RX IN: Receiver Inputs. These pins can be forced to ±25V
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to VCC.
DRIVER OUT: Driver Outputs at RS232 Voltage Levels.
Outputs are in a high impedance state when in SHUTDOWN, RECEIVER ALIVE mode or VCC = 0V. The driver
outputs are protected against ESD to ±10kV for human
body model discharges.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels. Outputs are in a high impedance state when in SHUTDOWN or RECEIVER DISABLE mode to allow data line
sharing.
Table 1. Functional Description
RX ENABLE
0
DR ENABLE
0
Receiver Disable
0
1
RECEIVER ALIVE
1
0
Normal
1
1
DRIVERS
All driver outputs are
high impedance.
All drivers alive.
RECEIVERS
All receiver outputs are
high impedance.
All receiver outputs are
high impedance.
ICC (µA)(TYP)
0.2
All driver outputs are
high impedance.
All drivers alive.
All receivers alive.
50
All receivers alive.
500
500
W
MODE
SHUTDOWN
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SWITCHI G TI E WAVEFOR S
DRIVER
INPUT
VCC
1.4V
1.4V
0V
V+
DRIVER
OUTPUT
0V
0V
t LHD
V–
t HLD
VCC
1.7V
RX
INPUT
RX
OUTPUT
1.3V
0V
2.4V
0.8V
t LHR
t HLR
LTC1338 • F01
Figure 1. Driver Propagation Delay Timing
VCC
0V
LTC1338 • F02
Figure 2. Receiver Propagation Delay Timing
5
LTC1338
TEST CIRCUITS
Receiver Timing Test Load
Driver Timing Test Load
DRIVER
INPUT
RX
OUTPUT
DRIVER
OUTPUT
RX INPUT
DRIVER
51pF
RX
51pF
3k
LTC1338 • F04
LTC1338 • F03
ESD Test Circuit
V+
C1
0.1µF
VCC
C2
0.1µF
DRIVER 1 OUT
DRIVER 2 OUT
RS232
LINE PINS
PROTECTED
TO ±10kV
RX1 IN
DRIVER 3 OUT
RX2 IN
DRIVER 4 OUT
RX3 IN
DRIVER 5 OUT
RX ENABLE
NC
28
1
2
LTC1338
V–
C4
0.1µF
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C3
0.1µF
DRIVER 1 IN
DRIVER 2 IN
RX1 OUT
DRIVER 3 IN
RX2 OUT
DRIVER 4 IN
RX3 OUT
DRIVER 5 IN
GND
DRIVER ENABLE
NC
LTC1338 • TC01
6
LTC1338
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PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
G Package
28-Lead SSOP
0.397 – 0.407*
(10.07 – 10.33)
0.205 – 0.212*
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8°
0.005 – 0.009
(0.13 – 0.22)
0.301 – 0.311
(7.65 – 7.90)
0.045
(1.14)
0.0256
(0.65)
BSC
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.045
(1.14)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
N Package
28-Lead Plastic DIP
0.600 – 0.625
(15.240 – 15.875)
0.009 – 0.015
(0.229 – 0.381)
(
0.130 ± 0.005
(3.302 ± 0.127)
15.87
+0.635
–0.381
0.045 – 0.065
(1.143 – 1.651)
0.015
(0.381)
MIN
+0.025
0.625 –0.015
)
1.455
(36.957)
MAX
0.070
(1.778)
TYP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0.505 – 0.560
(12.827 – 14.224)
0.125
(3.175)
MIN
0.035 – 0.080
(0.889 – 2.032)
0.018 ± 0.003
(0.457 ± 0.076)
0.100 ± 0.010
(2.540 ± 0.254)
S Package
28-Lead SOL
0.005
(0.127)
RAD MIN
0.291 – 0.299
(7.391 – 7.595)
(NOTE 2)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
0.010 – 0.029 × 45°
(2.362 – 2.642)
(0.254 – 0.737)
0.697 – 0.712
(17.70 – 18.08)
(NOTE 2)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0° – 8° TYP
0.009 – 0.013
(0.229 – 0.330) NOTE 1
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS.
0.004 – 0.012
(0.102 – 0.305)
0.394 – 0.419
(10.007 – 10.643)
NOTE 1
1
2
3
4
5
6
7
8
9 10 11 12 13 14
2. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
LTC1338
U.S. Area Sales Offices
NORTHEAST REGION
Linear Technology Corporation
One Oxford Valley
2300 E. Lincoln Hwy.,Suite 306
Langhorne, PA 19047
Phone: (215) 757-8578
FAX: (215) 757-5631
SOUTHEAST REGION
Linear Technology Corporation
17060 Dallas Parkway
Suite 208
Dallas, TX 75248
Phone: (214) 733-3071
FAX: (214) 380-5138
SOUTHWEST REGION
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22141 Ventura Blvd.
Suite 206
Woodland Hills, CA 91364
Phone: (818) 703-0835
FAX: (818) 703-0517
Linear Technology Corporation
266 Lowell St., Suite B-8
Wilmington, MA 01887
Phone: (508) 658-3881
FAX: (508) 658-2701
CENTRAL REGION
Linear Technology Corporation
Chesapeake Square
229 Mitchell Court, Suite A-25
Addison, IL 60101
Phone: (708) 620-6910
FAX: (708) 620-6977
NORTHWEST REGION
Linear Technology Corporation
782 Sycamore Dr.
Milpitas, CA 95035
Phone: (408) 428-2050
FAX: (408) 432-6331
International Sales Offices
FRANCE
Linear Technology S.A.R.L.
Immeuble "Le Quartz"
58 Chemin de la Justice
92290 Chatenay Malabry
France
Phone: 33-1-41079555
FAX: 33-1-46314613
KOREA
Linear Technology Korea Branch
Namsong Building, #505
Itaewon-Dong 260-199
Yongsan-Ku, Seoul
Korea
Phone: 82-2-792-1617
FAX: 82-2-792-1619
TAIWAN
Linear Technology Corporation
Rm. 801, No. 46, Sec. 2
Chung Shan N. Rd.
Taipei, Taiwan, R.O.C.
Phone: 886-2-521-7575
FAX: 886-2-562-2285
GERMANY
Linear Techonolgy GMBH
Untere Hauptstr. 9
D-85386 Eching
Germany
Phone: 49-89-3197410
FAX: 49-89-3194821
SINGAPORE
Linear Technology Pte. Ltd.
101 Boon Keng Road
#02-15 Kallang Ind. Estates
Singapore 1233
Phone: 65-293-5322
FAX: 65-292-0398
UNITED KINGDOM
Linear Technology (UK) Ltd.
The Coliseum, Riverside Way
Camberley, Surrey GU15 3YL
United Kingdom
Phone: 44-276-677676
FAX: 44-276-64851
JAPAN
Linear Technology KK
5F YZ Bldg.
4-4-12 Iidabashi, Chiyoda-Ku
Tokyo, 102 Japan
Phone: 81-3-3237-7891
FAX: 81-3-3237-8010
World Headquarters
Linear Technology Corporation
1630 McCarthy Blvd.
Milpitas, CA 95035-7487
Phone: (408) 432-1900
FAX: (408) 434-0507
08/16/93
8
Linear Technology Corporation
LT/GP 1093 10K REV 0 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
 LINEAR TECHNOLOGY CORPORATION 1993