LT1180A/LT1181A

Low Power 5V RS232

Dual Driver/Receiver with
0.1µF Capacitors
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FEATURES DESCRIPTIO
■ ESD Protection over ±10kV The LT®1180A/LT1181A are dual RS232 driver/receiver
■ Uses Small Capacitors: 0.1µF pairs with integral charge pump to generate RS232 volt-
■ 120kBaud Operation for RL = 3k, CL = 2500pF age levels from a single 5V supply. These circuits feature
■ 250kBaud Operation for RL = 3k, CL = 1000pF rugged bipolar design to provide operating fault tolerance
■ Outputs Withstand ±30V Without Damage and ESD protection unmatched by competing CMOS
■ CMOS Comparable Low Power: 40mW designs. Using only 0.1µF external capacitors, these cir-
■ Operates from a Single 5V Supply cuits consume only 40mW of power, and can operate to
■ Rugged Bipolar Design 120k baud even while driving heavy capacitive loads. New
■ Outputs Assume a High Impedance State When Off ESD structures on the chip allow the LT1180A/LT1181A to
or Powered Down survive multiple ±10kV strikes, eliminating the need for
■ Meets All RS232 Specifications costly TransZorbs® on the RS232 line pins. The LT1180A/
■ Available With or Without Shutdown LT1181A are fully compliant with EIA RS232 standards.
■ Absolutely No Latch-up Driver outputs are protected from overload, and can be
■ Available in SO Package shorted to ground or up to ±30V without damage. During
UO shutdown or power-off conditions, driver and receiver
APPLICATI S outputs are in a high impedance state, allowing line
■ Portable Computers sharing.
■ Battery-Powered Systems The LT1181A is available in 16-pin DIP and SO packages.
■ Power Supply Generator The LT1180A is supplied in 18-pin DIP and SO packages
■ Terminals for applications which require shutdown.
■ Modems , LTC and LT are registered trademarks of Linear Technology Corporation.
TransZorb is a registered trademark of General Instruments, GSI

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TYPICAL APPLICATI
2 17
+ 5V INPUT Output Waveforms
0.1µF
4 3
V + OUT
+
LT1180A 0.1µF
DRIVER
OUTPUT
5 7
+ V – OUT RL = 3k
0.1µF CL = 2500pF
0.1µF
6 +
12 15
RS232 OUTPUT RECEIVER
LOGIC OUTPUT
INPUTS R
11 8 CL = 50pF
RS232 OUTPUT
13 14
RS232 INPUT
INPUT
LOGIC 5k
OUTPUTS
10 9
RS232 INPUT LT1180A • TA02

18 5k 16
ON/OFF
LT1180A • TA01

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LT1180A/LT1181A
W W W U
ABSOLUTE AXI U RATI GS (Note 1)

Supply Voltage (VCC) ................................................ 6V Short-Circuit Duration

V + ........................................................................ 13.2V V + ................................................................... 30 sec
V – ...................................................................... –13.2V V – ................................................................... 30 sec
Input Voltage Driver Output .............................................. Indefinite
Driver ........................................................... V – to V + Receiver Output .......................................... Indefinite
Receiver ............................................... – 30V to 30V Operating Temperature Range
ON/OFF ................................................. – 0.3V to 12V LT1180AI/LT1181AI .......................... – 40°C to 85°C
Output Voltage LT1180AC/LT1181AC ............................. 0°C to 70°C
Driver ...................................... V+ – 30V to V – + 30V Storage Temperature Range ................ – 65°C to 150°C
Receiver .................................... – 0.3V to VCC + 0.3V Lead Temperature (Soldering, 10 sec)................. 300°C
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PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART TOP VIEW ORDER PART
NC 1 18 ON/OFF NUMBER C1+ 1 16 VCC
NUMBER
C1+ 2 17 VCC
V+ 2 15 GND
V+ 3 16 GND
C1 – 3 14 TR1 OUT
C1 – 4 15 TR1 OUT LT1180ACN LT1181ACN
C2+ 4 13 REC1 IN
C2+ 5 14 REC1 IN LT1180ACSW LT1181ACSW
C2 – 5 12 REC1 OUT
C2 – 6 13 REC1 OUT LT1180AIN V– 6 11 TR1 IN
LT1181AIN
V– 7 12 TR1 IN LT1180AISW LT1181AISW
TR2 OUT 7 10 TR2 IN
8 11 TR2 IN
TR2 OUT
LT1180AMJ REC2 IN 8 9 REC2 OUT LT1181AMJ
REC2 IN 9 10 REC2 OUT
J PACKAGE N PACKAGE SW PACKAGE
J PACKAGE N PACKAGE SW PACKAGE 16-LEAD CERDIP 16-LEAD PDIP 16-LEAD PLASTIC SO (WIDE)
18-LEAD CERDIP 18-LEAD PDIP 18-LEAD PLASTIC SO (WIDE)

TJMAX = 150°C, θJA =100°C/ W, θJC = 40°C/W (J) TJMAX = 150°C, θJA = 100°C/ W, θJC = 40°C/W (J)
TJMAX = 125°C, θJA = 80°C/ W, θJC = 36°C/W (N) TJMAX = 125°C, θJA = 90°C/ W, θJC = 46°C/W (N)
TJMAX = 125°C, θJA = 90°C/ W, θJC = 26°C/W (SW) TJMAX = 125°C, θJA = 95°C/ W, θJC = 27°C/W (SW)

ELECTRICAL CHARACTERISTICS (Note 2)

PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Generator
V + Output 7.9 V
V – Output – 7.0 V
Supply Current (VCC) (Note 3), TA = 25°C 9 13 mA
● 16 mA
Supply Current When OFF (VCC) Shutdown (Note 4) LT1180A Only ● 1 10 µA
Supply Rise Time C1 = C2 = C3 = C4 = 0.1µF 0.2 ms
Shutdown to Turn-On LT1180A Only 0.2 ms
ON/OFF Pin Thresholds Input Low Level (Device Shutdown) ● 0.8 1.2 V
Input High Level (Device Enabled) ● 1.6 2.4 V
ON/OFF Pin Current 0V ≤ VON/OFF ≤ 5V ● – 15 80 µA
Oscillator Frequency 130 kHz

2
 LT1180A/LT1181A
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Driver
Output Voltage Swing Load = 3k to GND Positive 5.0 7.5 V
Negative ● – 6.3 – 5.0 V
Logic Input Voltage Level Input Low Level (VOUT = High) ● 1.4 0.8 V
Input High Level (VOUT = Low) ● 2.0 1.4 V
Logic Input Current 0.8V ≤ VIN ≤ 2.0V ● 5 20 µA
Output Short-Circuit Current VOUT = 0V ±9 17 mA
Output Leakage Current Shutdown VOUT = ±30V (Note 4) ● 10 100 µA
Date Rate (Note 7) RL = 3k, CL = 2500pF 120 kBaud
RL = 3k, CL = 1000pF 250 kBaud
Slew Rate RL = 3k, CL = 51pF 15 30 V/µs
RL = 3k, CL = 2500pF 4 7 V/µs
Propagation Delay Output Transition tHL High-to-Low (Note 5) 0.6 1.3 µs
Output Transition tLH Low-to-High 0.5 1.3 µs
Receiver
Input Voltage Thresholds Input Low Threshold (VOUT = High) C Grade ● 0.8 1.3 V
Input High Threshold (VOUT = Low) C Grade ● 1.7 2.4 V
Input Low I, M Grade ● 0.2 1.3 V
Input High I, M Grade ● 1.7 3.0 V
Hysteresis ● 0.1 0.4 1.0 V
Input Resistance VIN = ±10V 3 5 7 kΩ
Output Leakage Current Shutdown (Note 4) 0 ≤ VOUT ≤ VCC ● 1 10 µA
Output Voltage Output Low, IOUT = – 1.6mA ● 0.2 0.4 V
Output High, IOUT = 160µA (VCC = 5V) ● 3.5 4.2 V
Output Short-Circuit Current Sinking Current, VOUT = VCC –20 – 10 mA
Sourcing Current, VOUT = 0V 10 20 mA
Propagation Delay Output Transition tHL High-to-Low (Note 6) 250 600 ns
Output Transition tLH Low-to-High 350 600 ns

The ● denotes specifications which apply over the operating temperature Note 5: For driver delay measurements, RL = 3k and CL = 51pF. Trigger
range (0°C ≤ TA ≤ 70°C for commercial grade, and – 40°C ≤ TA ≤ 85°C for points are set between the driver’s input logic threshold and the output
industrial grade. transition to the zero crossing (t HL = 1.4V to 0V and tLH = 1.4V to 0V).
Note 1: Absolute Maximum Ratings are those values beyond which the life Note 6: For receiver delay measurements, CL = 51pF. Trigger points are
of the device may be impaired. set between the receiver’s input logic threshold and the output transition
Note 2: Testing done at VCC = 5V and VON/OFF = 3V, unless otherwise to standard TTL/CMOS logic threshold (t HL = 1.3V to 2.4V and tLH = 1.7V
specified. to 0.8V).
Note 3: Supply current is measured as the average over several charge Note 7: Data rate operation guaranteed by slew rate, short-circuit current
pump cycles. C + = C – = C1 = C2 = 0.1µF. All outputs are open, with all and propagation delay tests.
driver inputs tied high.
Note 4: Supply current measurements in SHUTDOWN are performed with
VON/OFF ≤ 0.1V.

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LT1180A/LT1181A
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TYPICAL PERFOR A CE CHARACTERISTICS
Driver Maximum Output Voltage Driver Minimum Output Voltage
vs Load Capacitance vs Load Capacitance Driver Output Voltage
8.0 –4.0 10
RL = 3k
8
7.5 –4.5

DRIVER OUTPUT VOLTAGE (V)

6 VCC = 5.5V
PEAK OUTPUT VOLTAGE (V)

PEAK OUTPUT VOLTAGE (V)

120kBAUD
VCC = 5V
4
7.0 –5.0 VCC = 4.5V
20kBAUD 60kBAUD 2 OUTPUT HIGH
6.5 –5.5 0
20kBAUD OUTPUT LOW
60kBAUD –2 VCC = 4.5V
6.0 –6.0 VCC = 5V
–4
VCC = 5.5V
120kBAUD –6
5.5 –6.5
–8
5.0 –7.0 –10
0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 –55 –25 0 25 50 75 100 125
LOAD CAPACITANCE (nF) LOAD CAPACITANCE (nF) TEMPERATURE (°C)
LT1180A • TPC01 LT1180A • TPC02 LT1180A • TPC03

Receiver Input Thresholds Supply Current vs Data Rate ON/OFF Thresholds

3.00 50 3.0
2 DRIVERS ACTIVE
2.75
RL = 3k
2.50 CL = 2500pF 2.5
40
THRESHOLD VOLTAGE (V)

THRESHOLD VOLTAGE (V)

SUPPLY CURRENT (mA)

2.25
INPUT HIGH 2.0
2.00 30 ON THRESHOLD

1.75 1.5
1.50 INPUT LOW 20
1.25 1.0
OFF THRESHOLD
1.00 10 0.5
0.75
0.50 0 0
–55 –25 0 25 50 75 100 125 0 25 50 75 100 125 150 –55 –25 0 25 50 75 100 125
TEMPERATURE (°C) DATA RATE (kBAUD) TEMPERATURE (°C)
LT1180A • TPC04 LT1180A • TPC05 LT1180A • TPC06

Supply Current Driver Leakage in Shutdown Driver Short-Circuit Current

25 100 30
SHORT-CIRCUIT CURRENT (mA)

20 25
2 DRIVERS LOADED RL = 3k
ISC+
LEAKAGE CURRENT ( µA)
SUPPLY CURRENT (mA)

10 20
15

15
1 DRIVER LOADED RL = 3k
10 VOUT = 30V ISC–
1 10
VOUT = –30V
NO LOAD
5
5

0 0.1 0
–55 –25 0 25 50 75 100 125 –55 –25 0 25 50 75 100 125 –55 –25 0 25 50 75 100 125
TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C)
LT1180A • TPC07 LT1180A • TPC08 LT1180A • TPC09

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 LT1180A/LT1181A
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TYPICAL PERFOR A CE CHARACTERISTICS

Receiver Short-Circuit Current Slew Rate vs Load Capacitance

50 16

14
SHORT-CIRCUIT CURRENT (mA)

40
12
RX ISC–

SLEW RATE (V/µs)

30 10
RX ISC+
8
20 +SLEW
6
–SLEW
4
10
2

0 0
–55 –25 0 25 50 75 100 125 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
TEMPERATURE (°C) LOAD CAPACITANCE (nF)
LT1180A • TPC10 LT1180A • TPC11

Shutdown to Driver Outputs Driver Output Waveforms

10V
DRIVER 1 5V
OUTPUT DRIVER OUTPUT
GND RL = 3k
CL = 2500pF
GND
DRIVER 2 – 5V
OUTPUT DRIVER OUTPUT
– 10V
RL = 3k

ON/OFF PIN

INPUT
LT1180A • TPC12 LT1180A • TPC13

U U U
PI FU CTIO S
VCC: 5V Input Supply Pin. This pin should be decoupled V +: Positive Supply Output (RS232 Drivers). V + ≈ 2VCC –
with a 0.1µF ceramic capacitor close to the package pin. 1.5V. This pin requires an external charge storage capaci-
Insufficient supply bypassing can result in low output tor C ≥ 0.1µF, tied to ground or VCC. Larger value capaci-
drive levels and erratic charge pump operation. tors may be used to reduce supply ripple. With multiple
GND: Ground Pin. transceivers, the V+ and V – pins may be paralleled into
common capacitors.
ON/OFF: A TTL/CMOS Compatible Operating Mode Con-
trol. A logic low puts the LT1180A in shutdown mode. V –: Negative Supply Output (RS232 Drivers). V – ≈ –(2VCC
Supply current drops to zero and both driver and receiver – 2.5V). This pin requires an external charge storage
outputs assume a high impedance state. A logic high fully capacitor C ≥ 0.1µF. Larger value capacitors may be used
enables the device. to reduce supply ripple. With multiple transceivers, the V+
and V – pins may be paralleled into common capacitors.

5
LT1180A/LT1181A
U U U
PI FU CTIO S
TR1 IN, TR2 IN: RS232 Driver Input Pins. These inputs are REC1 IN, REC2 IN: Receiver Inputs. These pins accept
TTL/CMOS compatible. Inputs should not be allowed to RS232 level signals (±30V) into a protected 5k terminating
float. Tie unused inputs to VCC. resistor. The receiver inputs are protected against ESD to
±10kV for human body model discharges. Each receiver
TR1 OUT, TR2 OUT: Driver Outputs at RS232 Voltage
provides 0.4V of hysteresis for noise immunity. Open
Levels. Driver output swing meets RS232 levels for loads
receiver inputs assume a logic low state.
up to 3k. Slew rates are controlled for lightly loaded lines.
Output current capability is sufficient for load conditions REC1 OUT, REC2 OUT: Receiver outputs with TTL/CMOS
up to 2500pF. Outputs are in a high impedance state when Voltage Levels. Outputs are in a high impedance state
in shutdown mode, VCC = 0V, or when the driver disable when in shutdown mode to allow data line sharing. Outputs
pin is active. Outputs are fully short-circuit protected from are fully short-circuit protected to ground or VCC with the
V – + 30V to V + – 30V. Applying higher voltages will not power on, off or in the shutdown mode.
damage the device if the overdrive is moderately current C1 +, C1 –, C2 +, C2 –: Commutating Capacitor Inputs.
limited. Short circuits on one output can load the power These pins require two external capacitors C ≥ 0.1µF: one
supply generator and may disrupt the signal levels of the from C1+ to C1– and another from C2+ to C2 –. C1 should
other outputs. The driver outputs are protected against be deleted if a separate 12V supply is available and con-
ESD to ±10kV for human body model discharges. nected to pin C1+. Similarly, C2 should be deleted if a
separate – 12V supply is connected to pin V –.

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ESD PROTECTIO
The RS232 line inputs of the LT1180A/LT1181A have on- ESD Test Circuit
chip protection from ESD transients up to ±10kV. The 1 18
NC ON/OFF
protection structures act to divert the static discharge
2 LT1180A 17
safely to system ground. In order for the ESD protection to C1+ 5V VCC
+
+
function effectively, the power supply and ground pins of 0.1µF
0.1µF + 3
V+ GND
16 0.1µF

the circuit must be connected to ground through low 4 DR1 OUT 15

C1– RS232
impedances. The power supply decoupling capacitors and LINE PINS
5 RX1 IN 14
C2+ PROTECTED
charge pump storage capacitors provide this low imped- + TO ±10kV
0.1µF RX1 OUT 13
ance in normal application of the circuit. The only con- 6
C2 –
straint is that low ESR capacitors must be used for 0.1µF + 7
V–
DR1 IN 12

bypassing and charge storage. ESD testing must be done 8 DR2 OUT DR2 IN 11
RS232
with pins VCC, VL, V +, V –, and GND shorted to ground or LINE PINS
PROTECTED 9 RX2 IN RX2 OUT 10
connected with low ESR capacitors. TO ±10kV
LT1180A • ESD TC

6
 LT1180A/LT1181A
UO
TYPICAL APPLICATI

Supporting an LT1039 (Triple Driver/Receiver)

SHUTDOWN
5V
18 17 18 17
ON/OFF VCC VCC ON/OFF
LT1180A LT1039
15 4
11 8 TTL INPUT RS232 OUTPUT
TTL INPUT RS232 OUTPUT
13 6
TTL INPUT RS232 OUTPUT
12 15
TTL INPUT RS232 OUTPUT
11 8
TTL INPUT RS232 OUTPUT
13 14
TTL OUTPUT RS232 INPUT 16 3
TTL OUTPUT RS232 INPUT
5k
30k

10 9 14 5
TTL OUTPUT RS232 INPUT TTL OUTPUT RS232 INPUT
5k 30k
2
+ C1+
1µF 12 7
4 TTL OUTPUT RS232 INPUT
C1–
5 3 1 30k
+ C2 + V+ V+
1µF 6 7 9
C2 – V– V–
GND + GND
1µF 1µF
16 + 10
LT1180A • TA04

7
LT1180A/LT1181A
U
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.

J Package
16-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)
0.840
(21.336)
0.005
MAX
CORNER LEADS OPTION (0.127)
(4 PLCS) MIN
16 15 14 13 12 11 10 9

0.023 – 0.045 0.220 – 0.310

0.025
(0.584 – 1.143) (5.588 – 7.874)
HALF LEAD (0.635)
OPTION RAD TYP
0.045 – 0.068
(1.143 – 1.727) 1 2 3 4 5 6 7 8
FULL LEAD
OPTION 0.200
0.300 BSC
(5.080)
(0.762 BSC) MAX
0.015 – 0.060
(0.380 – 1.520)

0.008 – 0.018
0° – 15°
(0.203 – 0.457)

0.045 – 0.068 0.100 ± 0.010

0.125
(1.143 – 1.727) (2.540 ± 0.254)
(3.175)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE MIN 0.014 – 0.026
OR TIN PLATE LEADS (0.360 – 0.660)
J16 1197

J Package
18-Lead CERDIP (Narrow 0.300, Hermetic)
(LTC DWG # 05-08-1110)

0.960
CORNER LEADS OPTION (24.384)
(4 PLCS) 0.005 MAX
(0.127)
MIN 18 17 16 15 14 11
13 12 10
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD 0.025 0.220 – 0.310
OPTION (5.590 – 7.870)
(0.635)
0.045 – 0.068
RAD TYP
(1.143 – 1.727)
FULL LEAD
OPTION 1 2 3 4 5 6 7 8 9
0.200
0.300 BSC (5.080)
(0.762 BSC) MAX

0.015 – 0.060
(0.380 – 1.520)

0.008 – 0.018
0° – 15°
(0.203 – 0.457)

0.045 – 0.068 0.100 ± 0.010

0.125
(1.143 – 1.727) (2.540 ± 0.254)
(3.175)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE MIN 0.014 – 0.026
OR TIN PLATE LEADS (0.360 – 0.660) J18 1197

8
 LT1180A/LT1181A
U
PACKAGE DESCRIPTIO 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 2 3 4 5 6 7 8

0.300 – 0.325 0.130 ± 0.005 0.045 – 0.065

(7.620 – 8.255) (3.302 ± 0.127) (1.143 – 1.651)

0.020
(0.508)
MIN 0.065
0.009 – 0.015
(1.651)
(0.229 – 0.381) TYP
+0.035
0.325 –0.015

( )
0.125 0.100 ± 0.010 0.018 ± 0.003
+0.889 (3.175) (2.540 ± 0.254) (0.457 ± 0.076)
8.255
–0.381 MIN
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. N16 1197
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 2 3 4 5 6 7 8 9

0.300 – 0.325 0.130 ± 0.005 0.045 – 0.065

(7.620 – 8.255) (3.302 ± 0.127) (1.143 – 1.651)

0.020
(0.508)
MIN 0.065
0.009 – 0.015
(1.651)
(0.229 – 0.381) TYP
+0.035
0.325 –0.015 0.005
0.018 ± 0.003

( )
0.125
+0.889 (0.127)
8.255 (3.175)
MIN (0.457 ± 0.076)
–0.381 MIN
0.100 ± 0.010
(2.540 ± 0.254) N18 1197

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)

9
LT1180A/LT1181A
U
PACKAGE DESCRIPTIO 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)

1 2 3 4 5 6 7 8
0.291 – 0.299**
(7.391 – 7.595)

0.093 – 0.104 0.037 – 0.045

0.010 – 0.029 × 45° (0.940 – 1.143)
(2.362 – 2.642)
(0.254 – 0.737)

0° – 8° TYP

0.050
0.009 – 0.013 (1.270) 0.004 – 0.012
(0.229 – 0.330) NOTE 1 TYP (0.102 – 0.305)
0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
(0.406 – 1.270)
TYP
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS. S16 (WIDE) 0396
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

10
 LT1180A/LT1181A
U
PACKAGE DESCRIPTIO 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** 1 2 3 4 5 6 7 8 9
(7.391 – 7.595)
0.093 – 0.104 0.037 – 0.045
0.010 – 0.029 × 45° (0.940 – 1.143)
(2.362 – 2.642)
(0.254 – 0.737)

0° – 8° TYP

0.050
(1.270) 0.004 – 0.012
0.009 – 0.013
NOTE 1 TYP (0.102 – 0.305)
(0.229 – 0.330) 0.014 – 0.019
0.016 – 0.050
(0.356 – 0.482)
(0.406 – 1.270)
TYP
NOTE:
S18 (WIDE) 0396
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

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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11
LT1180A/LT1181A
UO
TYPICAL APPLICATI
Operation Using 5V and 12V Power Supplies

2 17
12V INPUT 5V INPUT
4 3

LT1180A
5 7
+ –12VOUT
0.1µF 0.1µF
6 +

12 15
RS232 OUTPUT

LOGIC INPUTS
11 8
RS232 OUTPUT
13 14
RS232 INPUT
5k
LOGIC OUTPUTS
10 9
RS232 INPUT
5k
18 16
ON/OFF LT1180A • TA03

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11801afa LT/TP 1098 REV A 2K • PRINTED IN USA

Linear Technology Corporation
12 1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com  LINEAR TECHNOLOGY CORPORATION 1994