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LT1780/LT1781 Low Power 5V RS232 Dual Driver/Receiver with 15kV ESD Protection DESCRIPTIO
The LT(R)1780/LT1781 are dual RS232 driver/receiver pairs with integral charge pump to generate RS232 voltage levels from a single 5V supply. Using only 0.1F external capacitors, these circuits consume only 40mW of power, and can operate to 120kbaud even while driving heavy capacitive loads. New ESD structures on the chip allow the LT1780/LT1781 to survive 15kV air gap and 8kV contact ESD tests per IEC 1000-4-2, eliminating the need for costly TransZorbs(R) on the RS232 line pins. The LT1780/ LT1781 are fully compliant with EIA RS232 standards. Driver outputs are protected from overload, and can be shorted to ground or up to 30V without damage. During SHUTDOWN or power-off conditions, driver and receiver outputs are in a high impedance state, allowing line sharing. The LT1780/LT1781 are direct upgrades to the LT1180A/ LT1181A, LT1280A/LT1281A and LT1381 for applications which require the utmost ESD protection. The LT1781 is available in 16-pin DIP,SO and SW packages. The LT1780 is supplied in 18-pin DIP and SW packages for applications which require SHUTDOWN.
, LTC and LT are registered trademarks of Linear Technology Corporation. TransZorb is a registered trademark of General Instruments, GSI.
FEATURES
s s
s s s s s s s s
s s s
10mA Max Supply Current ESD Protection to IEC 1000-4-2 Level 4 15kV Air Gap, 8kV Contact Uses Small Capacitors: 0.1F 120kBaud Operation for RL = 3k, CL = 2500pF 250kBaud Operation for RL = 3k, CL = 1000pF Outputs Withstand 30V Without Damage CMOS Comparable Low Power: 40mW Operates from a Single 5V Supply Rugged Bipolar Design Outputs Assume a High Impedance State When Off or Powered Down Meets All RS232 Specifications Available With or Without Shutdown Absolutely No Latch-up
APPLICATI
s s s s s
S
Portable Computers Battery-Powered Systems Power Supply Generator Terminals Modems
TYPICAL APPLICATI
2 0.1F 4 LT1780 5 0.1F 6 12 LOGIC INPUTS 7 3
17
5V INPUT V + OUT 0.1F V - OUT 0.1F
DRIVER OUTPUT RL = 3k CL = 2500pF
15
RS232 OUTPUT
11 13
8 14 5k
RECEIVER OUTPUT R CL = 50pF
RS232 OUTPUT RS232 INPUT
INPUT
LOGIC OUTPUTS 10 18
9 5k 16
RS232 INPUT
ON/OFF
1780/81 * TA01
U
UO
UO
Output Waveforms
1780/81 * TA02
1
LT1780/LT1781 ABSOLUTE AXI U RATI GS
Supply Voltage (VCC) ................................................ 6V V + ........................................................................ 13.2V V - ...................................................................... -13.2V Input Voltage Driver ........................................................... V - to V + Receiver ............................................... - 30V to 30V ON/OFF ................................................. - 0.3V to 12V Output Voltage Driver ...................................... V+ - 30V to V - + 30V Receiver .................................... - 0.3V to VCC + 0.3V
PACKAGE/ORDER I FOR ATIO
TOP VIEW NC C1+ V+ C1 - C2+ C2 - V- TR2 OUT REC2 IN 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 ON/OFF VCC GND TR1 OUT REC1 IN REC1 OUT TR1 IN TR2 IN REC2 OUT
ORDER PART NUMBER LT1780CN LT1780CSW
N PACKAGE 18-LEAD PLASTIC DIP
SW PACKAGE 18-LEAD PLASTIC SO
TJMAX = 125C, JA = 80C/ W, JC = 36C/W (N) TJMAX = 125C, JA = 90C/ W, JC = 26C/W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER Power Supply Generator V + Output V - Output Supply Current (VCC) Supply Current When OFF (VCC) Supply Rise Time SHUTDOWN to Turn-On ON/OFF Pin Thresholds ON/OFF Pin Current Oscillator Frequency Driver Output Voltage Swing Logic Input Voltage Level CONDITIONS
(Note 2)
MIN TYP 7.9 -7 8
q q
(Note 3), TA = 25C SHUTDOWN (Note 4) LT1780 Only C1 = C2 = C3 = C4 = 0.1F LT1780 Only Input Low Level (Device SHUTDOWN) Input High Level (Device Enabled) 0V VON/OFF 5V
Load = 3k to GND Input Low Level (VOUT = High) Input High Level (VOUT = Low)
2
U
U
W
WW
U
W
(Note 1)
Short-Circuit Duration V + ................................................................... 30 sec V - ................................................................... 30 sec Driver Output .............................................. Indefinite Receiver Output .......................................... Indefinite Operating Temperature Range ..................... 0C to 70C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C
TOP VIEW C1+ V+ C1 - C2+ C2 - V- TR2 OUT REC2 IN 1 2 3 4 5 6 7 8 16 VCC 15 GND 14 TR1 OUT 13 REC1 IN 12 REC1 OUT 11 TR1 IN 10 TR2 IN 9 REC2 OUT
ORDER PART NUMBER LT1781CN LT1781CS LT1781CSW
S PACKAGE SW PACKAGE N PACKAGE 16-LEAD PLASTIC DIP 16-LEAD PLASTIC SO 16-LEAD PLASTIC SO TJMAX = 125C, JA = 90C/ W, JC = 46C/W (N) TJMAX = 125C, JA = 95C/ W, JC = 34C/W (S) TJMAX = 125C, JA = 95C/ W, JC = 27C/W (SW)
MAX
UNITS V V mA mA A ms ms V V A kHz V V V V
q q q
0.8 - 15
1 0.2 0.2 1.2 1.6 130
10 14 10
2.4 80
Positive Negative
q q q q
5.0
7.5 - 6.3 1.4 1.4
-5 0.8
2.0
LT1780/LT1781
ELECTRICAL CHARACTERISTICS
PARAMETER Logic Input Current Output Short-Circuit Current Output Leakage Current Data Rate Slew Rate Propagation Delay Receiver Input Voltage Thresholds Hysteresis Input Resistance Output Leakage Current Output Voltage Output Short-Circuit Current Propagation Delay V IN = 10V CONDITIONS 0.8V VIN 2.0V VOUT = 0V
(Note 2)
MIN
q
TYP 5 17 10
MAX 20 100
UNITS A mA A kBaud kBaud
7
q
SHUTDOWN VOUT = 30V (Note 4) RL = 3k, CL = 2500pF RL = 3k, CL = 1000pF RL = 3k, CL = 51pF RL = 3k, CL = 2500pF Output Transition tHL High-to-Low (Note 5) Output Transition tLH Low-to-High Input Low Threshold (VOUT = High) Input High Threshold (VOUT = Low)
120 250 4 15 7 0.6 0.5 0.8
q
30 1.3 1.3
V/s V/s s s V V V k A V V mA mA ns ns
1.3 1.7 0.4 5 1 0.2 4.2 - 20 20 250 350
2.4 1 7 10 0.4 - 10 600 600
0.1 3
SHUTDOWN (Note 4) 0 VOUT VCC Output Low, IOUT = - 1.6mA Output High, IOUT = 160A (VCC = 5V) Sinking Current, VOUT = VCC Sourcing Current, VOUT = 0V Output Transition tHL High-to-Low (Note 6) Output Transition tLH Low-to-High
q q q
3.5 10
The q denotes specifications which apply over the operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise specified. Note 3: Supply current is measured as the average over several charge pump cycles. C + = C - = C1 = C2 = 0.1F. All outputs are open, with all driver inputs tied high.
Note 4: Supply current measurements in SHUTDOWN are performed with VON/OFF 0.1V. Note 5: For driver delay measurements, RL = 3k and CL = 51pF. Trigger points are set between the driver's input logic threshold and the output transition to the zero crossing (t HL = 1.4V to 0V and tLH = 1.4V to 0V). Note 6: For receiver delay measurements, CL = 51pF. Trigger points are set between the receiver's input logic threshold and the output transition to standard TTL/CMOS logic threshold (t HL = 1.3V to 2.4V and tLH = 1.7V to 0.8V).
3
LT1780/LT1781
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Maximum Output Voltage vs Load Capacitance
8.0 7.5
PEAK OUTPUT VOLTAGE (V)
DRIVER OUTPUT VOLTAGE (V)
PEAK OUTPUT VOLTAGE (V)
7.0 20k BAUD 6.5 60k BAUD 6.0 5.5 5.0 0 1 2 345678 LOAD CAPACITANCE (nF) 9 10 120k BAUD
Receiver Input Thresholds
3.00 2.75
THRESHOLD VOLTAGE (V)
2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 -55 -25 INPUT LOW INPUT HIGH
SUPPLY CURRENT (mA)
50 25 0 75 TEMPERATURE (C)
ON/OFF Thresholds
3.0 2.5 THRESHOLD VOLTAGE (V) 2.0 1.5 1.0 OFF THRESHOLD 0.5 0 -55 -25
ON THRESHOLD
SUPPLY CURRENT (mA)
50 25 75 0 TEMPERATURE (C)
4
UW
1780 * G01
Driver Minimum Output Voltage vs Load Capacitance
-4.0 -4.5 120k BAUD -5.0 60k BAUD -5.5 -6.0 -6.5 -7.0 0 1 2 345678 LOAD CAPACITANCE (nF) 9 10 20k BAUD
10 8 6 4 2 0 -2 -4 -6 -8
Driver Output Voltage
RL = 3k VCC = 5.5V VCC = 5V VCC = 4.5V OUTPUT HIGH OUTPUT LOW VCC = 4.5V VCC = 5V VCC = 5.5V
-10 -55 -25
50 25 0 75 TEMPERATURE (C)
100
125
1780 * G02
1780 * G03
Supply Current vs Data Rate
50 2 DRIVERS ACTIVE RL = 3k CL = 2500pF
40
30
20
10
0
100 125
0
25
50 75 100 DATA RATE (kBAUD)
125
150
1780 * G04
1780 * G05
Supply Current
25
20
2 DRIVERS LOADED RL = 3k
15 1 DRIVER LOADED RL = 3k
10
NO LOAD 5
100
125
0 -55 -25
50 25 0 75 TEMPERATURE (C)
100
125
1780 * G06
1780 * G07
LT1780/LT1781
TYPICAL PERFOR A CE CHARACTERISTICS
Driver Leakage in Shutdown
100 SHORT-CIRCUIT CURRENT (mA) 30 25 ISC + 20 15 ISC - 10 5 0 -55 -25
( A)
10
LEAKAGE CURRENT
1
0.1 -55 -25
50 25 0 75 TEMPERATURE (C)
Receiver Short-Circuit Current
50
SHORT-CIRCUIT CURRENT (mA)
40
SLEW RATE (V/s)
30 RX ISC + 20
10
0 -55 -25
50 25 0 75 TEMPERATURE (C)
Shutdown to Driver Outputs
10V DRIVER 1 OUTPUT 5V GND GND DRIVER 2 OUTPUT - 5V - 10V ON/OFF PIN INPUT
1780 * G12
UW
Driver Short-Circuit Current
VOUT = 30V VOUT = -30V
100
125
50 25 75 0 TEMPERATURE (C)
100
125
1780 * G08
1780 * G09
Slew Rate vs Load Capacitance
16 14
RX ISC -
12 10 8 +SLEW 6 -SLEW 4 2
100 125
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 LOAD CAPACITANCE (nF)
1780 * G11
1780 * G10
Driver Output Waveforms
DRIVER OUTPUT RL = 3k CL = 2500pF
DRIVER OUTPUT RL = 3k
1780 * G13
5
LT1780/LT1781 PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1F ceramic capacitor close to the package pin. Insufficient supply bypassing can result in low output drive levels and erratic charge pump operation. GND: Ground Pin. ON/OFF: A TTL/CMOS Compatible Operating Mode Control. A logic low puts the LT1780 in SHUTDOWN mode. Supply current drops to zero and both driver and receiver outputs assume a high impedance state. A logic high fully enables the device. V +: Positive Supply Output (RS232 Drivers). V + 2VCC - 1.5V. This pin requires an external charge storage capacitor C 0.1F, tied to ground or VCC. Larger value capacitors may be used to reduce supply ripple. With multiple transceivers, the V+ and V - pins may be paralleled into common capacitors. V -: Negative Supply Output (RS232 Drivers). V - -(2VCC - 2.5V). This pin requires an external charge storage capacitor C 0.1F. Larger value capacitors may be used to reduce supply ripple. With multiple transceivers, the V+ and V - pins may be paralleled into common capacitors. TR1 IN, TR2 IN: RS232 Driver Input Pins. These inputs are TTL/CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. TR1 OUT, TR2 OUT: Driver Outputs at RS232 Voltage Levels. Driver output swing meets RS232 levels for loads up to 3k. Slew rates are controlled for lightly loaded lines. Output current capability is sufficient for load conditions up to 2500pF. Outputs are in a high impedance state when in SHUTDOWN mode or VCC = 0V. Outputs are fully shortcircuit protected from V - + 30V to V + - 30V. Applying higher voltages will not damage the device if the overdrive is moderately current limited. Short circuits on one output can load the power supply generator and may disrupt the signal levels of the other outputs. The driver outputs are protected against ESD to IEC-1000-4-2 Level 4 discharges. REC1 IN, REC2 IN: Receiver Inputs. These pins accept RS232 level signals (30V) into a protected 5k terminating resistor. The receiver inputs are protected against ESD to IEC-1000-4-2 Level 4 discharges. Each receiver provides 0.4V of hysteresis for noise immunity. Open receiver inputs result in a logic high receiver output state. REC1 OUT, REC2 OUT: Receiver outputs with TTL/CMOS Voltage Levels. Outputs are in a high impedance state when in SHUTDOWN mode to allow data line sharing. Outputs are fully short-circuit protected to ground or VCC with the power ON, OFF or in the SHUTDOWN mode. C1 +, C1 -, C2 +, C2 -: Commutating Capacitor Inputs. These pins require two external capacitors C 0.1F: one from C1+ to C1- and another from C2+ to C2 -. C1 should be deleted if a separate 12V supply is available and connected to pin C1+. Similarly, C2 should be deleted if a separate - 12V supply is connected to pin V -.
6
U
U
U
LT1780/LT1781
ESD PROTECTIO
The RS232 line inputs of the LT1780/LT1781 have on-chip protection from ESD transients up to 15kV air gap and 8kV contact tested to IEC-1000-4-2 test methods. The protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to function effectively, the power supply and ground pins of the circuit must be connected to ground through low impedances. The power supply decoupling capacitors and charge pump storage capacitors provide this low impedance in normal application of the circuit. The only constraint is that low ESR capacitors must be used for bypassing and charge storage. ESD testing must be done with pins VCC, VL, V +, V -, and GND shorted to ground or connected with low ESR capacitors.
TYPICAL APPLICATIO
U
U
ESD Test Circuit
NC 1 LT1780 18 ON/OFF C1+ 2 0.1F 0.1F V+ 3 C1- 4 C2+ 0.1F 0.1F 5 17 5V VCC 16 GND 15 14 DR1 OUT RX1 IN 0.1F C2 - 6 V- 7 8 9 RS232 LINE PINS PROTECTED TO IEC-1000-4-2 13 RX1 OUT LEVEL 4 12 11 10 DR1 IN DR2 IN RX2 OUT
1780 * ESD TC
DR2 OUT RS232 LINE PINS PROTECTED TO IEC-1000-4-2 LEVEL 4 RX2 IN
Operation Using 5V and 12V Power Supplies
12V INPUT
2 4
17 3
5V INPUT
LT1780 5 0.1F 6 12 LOGIC INPUTS 15 7 0.1F -12VOUT
RS232 OUTPUT
11 13
8 14 5k
RS232 OUTPUT RS232 INPUT
LOGIC OUTPUTS 10
9 5k
RS232 INPUT
ON/OFF
18
16
1780/81 * TA03
7
LT1780/LT1781 PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted. N Package 16-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 16 15 14 13 12 11 10 9
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
8
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076)
N16 1197
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N Package 18-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.900* (22.860) MAX 18 17 16 15 14 13 12 11 10
0.255 0.015* (6.477 0.381)
1 0.300 - 0.325 (7.620 - 8.255) 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
8
9
0.045 - 0.065 (1.143 - 1.651)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N18 1197
0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
+0.035 0.325 -0.015 +0.889 8.255 -0.381
)
8
LT1780/LT1781 PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
SW Package 16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.398 - 0.413* (10.109 - 10.490) 16 15 14 13 12 11 10 9
NOTE 1
0.394 - 0.419 (10.007 - 10.643)
0.291 - 0.299** (7.391 - 7.595) 0.010 - 0.029 x 45 (0.254 - 0.737) 0 - 8 TYP
1 0.093 - 0.104 (2.362 - 2.642)
2
3
4
5
6
7
8 0.037 - 0.045 (0.940 - 1.143)
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
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 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.014 - 0.019 (0.356 - 0.482) TYP
S16 (WIDE) 0396
9
LT1780/LT1781 PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
SW Package 18-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.447 - 0.463* (11.354 - 11.760) 18 17 16 15 14 13 12 11 10
SEE NOTE
0.394 - 0.419 (10.007 - 10.643)
0.291 - 0.299** (7.391 - 7.595) 0.010 - 0.029 x 45 (0.254 - 0.737) 0 - 8 TYP
1 0.093 - 0.104 (2.362 - 2.642)
2
3
4
5
6
7
8
9 0.037 - 0.045 (0.940 - 1.143)
0.009 - 0.013 (0.229 - 0.330)
NOTE 1 0.016 - 0.050 (0.406 - 1.270)
0.050 (1.270) TYP
0.004 - 0.012 (0.102 - 0.305)
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 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.014 - 0.019 (0.356 - 0.482) TYP
S18 (WIDE) 0396
10
LT1780/LT1781 PACKAGE DESCRIPTIO U
Dimensions in inches (millimeters) unless otherwise noted.
S Package 16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 - 0.394* (9.804 - 10.008) 16 15 14 13 12 11 10 9
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP 0.053 - 0.069 (1.346 - 1.752)
2
3
4
5
6
7
8
0.004 - 0.010 (0.101 - 0.254)
0.016 - 0.050 0.406 - 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) TYP
S16 0695
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.
11
LT1780/LT1781
TYPICAL APPLICATIO
SHUTDOWN 5V 18 VCC ON/OFF LT1780 17 18 VCC ON/OFF LT1039 17
TTL INPUT
11
TTL INPUT
12
TTL OUTPUT
13 5k
TTL OUTPUT
10 5k 2 C1+ C1- C2 + C2 - GND 16 V+ V-
1F
4 5
1F
6
RELATED PARTS
PART NUMBER LT1137A LTC1383 LTC1387 DESCRIPTION 3Driver/5Receiver RS232 Transceiver 5V Low Power RS232 2Driver/2Receiver Transceiver Single 5V RS232/RS485 Multiprotocol Transceiver COMMENTS IEC-1000-4-2 Level 4 ESD Compliance Low Supply Current ICC = 220A Configurable as Dual RS232 or Single RS485 Transceiver
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
Supporting an LT1039 (Triple Driver/Receiver)
8 RS232 OUTPUT RS232 OUTPUT TTL INPUT 15 13 4 6 RS232 OUTPUT RS232 OUTPUT 15 TTL INPUT TTL INPUT 14 RS232 INPUT TTL OUTPUT 11 16 30k 9 RS232 INPUT TTL OUTPUT 14 30k TTL OUTPUT 3 7 1F 1F 12 30k 1 9 V+ V- GND 10
1780/81 * TA04
8 3
RS232 OUTPUT RS232 INPUT
5
RS232 INPUT
7
RS232 INPUT
17801f LT/TP 0498 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1998

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