background image

1

LT1180A/LT1181A

 11801afb

DESCRIPTIO

U

FEATURES

APPLICATIO  S

U

TYPICAL APPLICATIO

U

Low Power 5V RS232

Dual Driver/Receiver with

0.1

µ

F Capacitors

R

Output Waveforms

LT1180A • TA02

DRIVER

OUTPUT

R

L

 = 3k

C

L

 = 2500pF

RECEIVER

OUTPUT

C

L

 = 50pF

INPUT

5k

5k

0.1

µ

F

LOGIC

INPUTS

LOGIC

OUTPUTS

ON/OFF

18

10

13

11

12

6

5

4

2

16

9

14

8

15

7

3

17

5V INPUT

V

+

 OUT

V

 OUT

RS232 OUTPUT

RS232 OUTPUT

RS232 INPUT

RS232 INPUT

LT1180A • TA01

LT1180A

+

0.1

µ

F

+

0.1

µ

F

+

0.1

µ

F

+

s

ESD Protection over 

±

10kV

s

Uses Small Capacitors: 0.1

µ

F

s

120kBaud Operation for R

L

 = 3k, C

L

 = 2500pF

s

250kBaud Operation for R

L

 = 3k, C

L

 = 1000pF

s

Outputs Withstand 

±

30V Without Damage

s

CMOS Comparable Low Power: 40mW

s

Operates from a Single 5V Supply

s

Rugged Bipolar Design

s

Outputs Assume a High Impedance State When Off

or Powered Down

s

Meets All RS232 Specifications

s

Available With or Without Shutdown

s

Absolutely No Latch-up

s

Available in SO Package

s

Portable Computers

s

Battery-Powered Systems

s

Power Supply Generator

s

Terminals

s

Modems

, LTC and LT are registered trademarks of Linear Technology Corporation.

TransZorb is a registered trademark of General Instruments, GSI

The LT

®

1180A/LT1181A are dual RS232 driver/receiver

pairs with integral charge pump to generate RS232 volt-

age levels from a single 5V supply. These circuits feature

rugged bipolar design to provide operating fault tolerance

and ESD protection unmatched by competing CMOS

designs. Using only 0.1

µ

F external capacitors, these cir-

cuits consume only 40mW of power, and can operate to

120k baud even while driving heavy capacitive loads. New

ESD structures on the chip allow the LT1180A/LT1181A to

survive multiple 

±

10kV strikes, eliminating the need for

costly TransZorbs

®

 on the RS232 line pins. The LT1180A/

LT1181A 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 LT1181A is available in 16-pin DIP and SO packages.

The LT1180A is supplied in 18-pin DIP and SO packages

for applications which require shutdown.

background image

2

LT1180A/LT1181A

 11801afb

A

U

G

W

A

W

U

W

A

R

BSOLUTE

XI

TI

S

Supply Voltage (V

CC

) ................................................  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 V

CC

 + 0.3V

Short-Circuit Duration

V

+

...................................................................  30 sec

V

...................................................................  30 sec

Driver Output ..............................................  Indefinite

Receiver Output ..........................................  Indefinite

Operating Temperature Range

LT1180AI/LT1181AI ..........................  – 40

°

C to 85

°

C

LT1180AC/LT1181AC .............................  0

°

C to 70

°

C

Storage Temperature Range ................  – 65

°

C to 150

°

C

Lead Temperature (Soldering, 10 sec).................  300

°

C

W

U

U

PACKAGE/ORDER I FOR ATIO

ORDER PART

NUMBER

ORDER PART

NUMBER

ELECTRICAL C

C

HARA TERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power Supply Generator

V

+

 Output

7.9

V

V

 Output

                          – 7.0

V

Supply Current (V

CC

)

(Note 3), T

A

 = 25

°

C

9

13

mA

q

16

mA

Supply Current When OFF (V

CC

)

Shutdown (Note 4) LT1180A Only

q

1

10

µ

A

Supply Rise Time

C1 = C2 = C3 = C4 = 0.1

µ

F

0.2

ms

Shutdown to Turn-On

LT1180A Only

0.2

ms

ON/OFF Pin Thresholds

Input Low Level (Device Shutdown)

q

0.8

1.2

V

Input High Level (Device Enabled)

q

1.6

2.4

V

T

JMAX 

= 125

°

C, 

θ

JA 

= 90

°

C/ W, 

θ

JC

 = 46

°

C/W (N)

T

JMAX 

= 125

°

C, 

θ

JA 

= 95

°

C/ W, 

θ

JC

 = 27

°

C/W (SW)

LT1181ACN

LT1181ACSW

LT1181AIN

LT1181AISW

LT1181AMJ

LT1180ACN

LT1180ACSW

LT1180AIN

LT1180AISW

LT1180AMJ

T

JMAX 

= 125

°

C, 

θ

JA 

= 80

°

C/ W, 

θ

JC

 = 36

°

C/W (N)

T

JMAX 

= 125

°

C, 

θ

JA 

= 90

°

C/ W, 

θ

JC

 = 26

°

C/W (SW)

1

2

3

4

5

6

7

8

9

TOP VIEW

18

17

16

15

14

13

12

11

10

NC

C1

+

V

+

C1

C2

+

C2

V

TR2 OUT

REC2 IN

N PACKAGE

18-LEAD PDIP

ON/OFF

V

CC

GND

TR1 OUT

REC1 IN

REC1 OUT

TR1 IN

TR2 IN

REC2 OUT

SW PACKAGE

18-LEAD PLASTIC SO (WIDE)

1

2

3

4

5

6

7

8

TOP VIEW

16

15

14

13

12

11

10

9

C1

+

V

+

C1

C2

+

C2

V

TR2 OUT

REC2 IN

V

CC

GND

TR1 OUT

REC1 IN

REC1 OUT

TR1 IN

TR2 IN

REC2 OUT

N PACKAGE

16-LEAD PDIP

SW PACKAGE

16-LEAD PLASTIC SO (WIDE)

(Note 1)

Consult LTC Marketing for parts specified with wider operating temperature ranges.

J PACKAGE

18-LEAD CERDIP

T

JMAX

 = 150

°

C, 

θ

JA

 = 100

°

C/W, 

θ

JC

 = 40

°

C/W (J)

OBSOLETE PACKAGE

Consider N Package for Alternate Source

The 

q

 denotes specifications which apply over the operating temperature

range (0

°

 T

A

 

 70

°

C for commercial grade, and – 40

°

 T

A

 

 85

°

C for industrial grade. (Note 2)

J PACKAGE

16-LEAD CERDIP

T

JMAX

 = 150

°

C, 

θ

JA

 = 100

°

C/W, 

θ

JC

 = 40

°

C/W (J)

OBSOLETE PACKAGE

Consider N Package for Alternate Source

background image

3

LT1180A/LT1181A

 11801afb

ELECTRICAL C

C

HARA TERISTICS

The 

q

 denotes specifications which apply over the operating temperature

range (0

°

 T

A

 

 70

°

C for commercial grade, and – 40

°

 T

A

 

 85

°

C for industrial grade. (Note 2)

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: Testing done at V

CC

 = 5V and V

ON/OFF

 = 3V, unless otherwise

specified.

Note 3:  Supply current is measured as the average over several charge

pump cycles. C

+

 = C

 = C1 = C2 = 0.1

µ

F. All outputs are open, with all

driver inputs tied high.

Note 4: Supply current measurements in SHUTDOWN are performed with

V

ON/OFF

 

 0.1V.

Note 5: For driver delay measurements, R

L

 = 3k and C

L

 = 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 t

LH

 = 1.4V to 0V).

Note 6: For receiver delay measurements, C

L

 = 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 t

LH

 = 1.7V

to 0.8V).

Note 7: Data rate operation guaranteed by slew rate, short-circuit current

and propagation delay tests.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ON/OFF Pin Current

0V 

 V

ON/OFF

 

 5V

q

– 15

80

µ

A

Oscillator Frequency

130

kHz

Driver

Output Voltage Swing

Load = 3k to GND

Positive

5.0

  7.5

V

Negative

q

– 6.3

– 5.0

V

Logic Input Voltage Level

Input Low Level (V

OUT

 = High)

q

1.4

0.8

V

Input High Level (V

OUT

 = Low)

q

2.0

1.4

V

Logic Input Current

0.8V 

 V

IN

 

 2.0V

q

5

20

µ

A

Output Short-Circuit Current

V

OUT

 = 0V

±

9

17

mA

Output Leakage Current

Shutdown V

OUT

 = 

±

30V (Note 4)

q

10

100

µ

A

Date Rate (Note 7)

R

L

 = 3k, C

L

 = 2500pF

120

kBaud

R

L

 = 3k, C

L

 = 1000pF

250

kBaud

Slew Rate

R

L

 = 3k, C

L

 = 51pF

15

30

V/

µ

s

R

L

 = 3k, C

L

 = 2500pF

4

7

V/

µ

s

Propagation Delay

Output Transition t

HL

 High-to-Low (Note 5)

0.6

1.3

µ

s

Output Transition t

LH

 Low-to-High

0.5

1.3

µ

s

Receiver

Input Voltage Thresholds

Input Low Threshold (V

OUT

 = High)

C Grade

q

0.8

1.3

V

Input High Threshold (V

OUT

 = Low)

C Grade

q

1.7

2.4

V

Input LowI,

M Grade

q

0.2

1.3

V

Input HighI,

M Grade

q

1.7

3.0

V

Hysteresis

q

0.1

0.4

1.0

V

Input Resistance

V

IN

 = 

±

10V

3

5

7

k

Output Leakage Current

Shutdown (Note 4) 0 

 V

OUT

 

 V

CC

q

1

10

µ

A

Output Voltage

Output Low, I

OUT

 = – 1.6mA

q

0.2

0.4

V

Output High, I

OUT

 = 160

µ

A (V

CC

 = 5V)

q

3.5

4.2

V

Output Short-Circuit Current

Sinking Current, V

OUT

 = V

CC

–20

– 10

mA

Sourcing Current, V

OUT

 = 0V

10

  20

mA

Propagation Delay

Output Transition t

HL

 High-to-Low (Note 6)

250

600

ns

Output Transition t

LH

 Low-to-High

350

600

ns

background image

4

LT1180A/LT1181A

 11801afb

C

C

HARA TERISTICS

U

W

A

TYPICAL PERFOR

CE

Receiver Input Thresholds

Supply Current

Driver Leakage in Shutdown

TEMPERATURE (°C)

–55

0.50

THRESHOLD VOLTAGE (V)

0.75

1.25

1.50

1.75

3.00

2.25

0

50

75

LT1180A • TPC04

1.00

2.50

2.75

2.00

–25

25

100

125

INPUT HIGH

INPUT LOW

Supply Current vs Data Rate

ON/OFF Thresholds

TEMPERATURE (°C)

–55

THRESHOLD VOLTAGE (V)

2.0

2.5

3.0

25

75

LT1180A • TPC06

1.5

1.0

–25

0

50

100

125

0.5

0

ON THRESHOLD

OFF THRESHOLD

TEMPERATURE (°C)

0.1

LEAKAGE CURRENT 

(

µ

A)

10

100

LT1180A • TPC08

1

–55

0

50

75

–25

25

100

125

V

OUT 

= –30V

V

OUT 

= 30V

Driver Short-Circuit Current

DATA RATE (kBAUD)

0

0

SUPPLY CURRENT (mA)

10

20

30

40

50

25

50

75

100

LT1180A • TPC05

125

150

2 DRIVERS ACTIVE

R

L

 = 3k

C

L

 = 2500pF

TEMPERATURE (°C)

–55

0

SUPPLY CURRENT (mA)

10

25

0

50

75

LT1180A • TPC07

5

20

15

–25

25

100

125

2 DRIVERS LOADED R

L

 = 3k

1 DRIVER LOADED R

L

 = 3k

NO LOAD

Driver Output Voltage

Driver Maximum Output Voltage

vs Load Capacitance

TEMPERATURE (°C)

–55

–10

DRIVER OUTPUT VOLTAGE (V)

–8

–4

–2

0

10

4

0

50

75

LT1180A • TPC03

–6

6

8

2

–25

25

100

125

OUTPUT HIGH

OUTPUT LOW

R

L

 = 3k

V

CC

 = 5V

V

CC

 = 4.5V

V

CC

 = 5.5V

V

CC

 = 4.5V

V

CC

 = 5V

V

CC

 = 5.5V

LOAD CAPACITANCE (nF)

0

5.0

PEAK OUTPUT VOLTAGE (V)

5.5

6.0

6.5

7.0

7.5

8.0

2

4

6

8

LT1180A • TPC01

10

1

3

5

7

9

20kBAUD

60kBAUD

120kBAUD

LOAD CAPACITANCE (nF)

0

–7.0

PEAK OUTPUT VOLTAGE (V)

–6.5

–6.0

–5.5

–5.0

–4.5

–4.0

2

4

6

8

LT1180A • TPC02

10

1

3

5

7

9

120kBAUD

60kBAUD

20kBAUD

Driver Minimum Output Voltage

vs Load Capacitance

TEMPERATURE (

°

C)

–55

SHORT-CIRCUIT CURRENT (mA)

20

25

30

25

75

LT1180A • TPC09

15

10

–25

0

50

100

125

5

0

I

SC

+

I

SC

background image

5

LT1180A/LT1181A

 11801afb

C

C

HARA TERISTICS

U

W

A

TYPICAL PERFOR

CE

LOAD CAPACITANCE (nF)

0

SLEW RATE (V/µs)

12

16

4.0

LT1180A • TPC11

8

4

0

1.0 

2.0

3.0

5.0

10

14

6

2

3.5

0.5

1.5

2.5

4.5

+SLEW

–SLEW

LT1180A • TPC13

LT1180A • TPC12

INPUT

DRIVER OUTPUT

R

L

 = 3k

DRIVER OUTPUT

R

L

 = 3k

C

L

 = 2500pF

DRIVER 1

OUTPUT

ON/OFF PIN

Shutdown to Driver Outputs

Driver Output Waveforms

10V

5V

GND

GND

– 10V

– 5V

DRIVER 2

OUTPUT

Slew Rate vs Load Capacitance

Receiver Short-Circuit Current

PI   FU  CTIO  S

 U

U

U

V

+

: Positive Supply Output (RS232 Drivers). V

+

 

 2V

CC

 –

1.5V. This pin requires an external charge storage capaci-

tor C 

 0.1

µ

F, tied to ground or V

CC

. Larger value capaci-

tors 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

 

  –(2V

CC

– 2.5V). This pin requires an external charge storage

capacitor C 

 0.1

µ

F. Larger value capacitors may be used

to reduce supply ripple. With multiple transceivers, the V

+

and V

 pins may be paralleled into common capacitors.

TEMPERATURE (

°

C)

–55

0

SHORT-CIRCUIT CURRENT (mA)

20

50

0

50

75

LT1180A • TPC10

10

40

30

–25

25

100

125

RX I

SC

RX I

SC

+

V

CC

5V Input Supply Pin. This pin should be decoupled

with a 0.1

µ

F 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 Con-

trol. A logic low puts the LT1180A 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.

background image

6

LT1180A/LT1181A

 11801afb

PI   FU  CTIO  S

 U

U

U

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 V

CC

.

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, V

CC

 = 0V, or when the driver disable

pin is active. Outputs are fully short-circuit 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 

±

10kV for human body model 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

±

10kV for human body model discharges. Each receiver

provides 0.4V of hysteresis for noise immunity. Open

receiver inputs assume a logic low 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 V

CC

 with the

power on, off or in the shutdown mode.

C1

+

, C1

, C2

+

, C2

: Commutating Capacitor Inputs.

These pins require two external capacitors C 

 0.1

µ

F: one

from C1

+

 to C1

 and another from C2

+

 to C2

. C1 should

be deleted if a separate 12V supply is available and con-

nected to pin C1

+

. Similarly, C2 should be deleted if a

separate – 12V supply is connected to pin V

.

ESD Test Circuit

ESD PROTECTIO

U

The RS232 line inputs of the LT1180A/LT1181A have on-

chip protection from ESD transients up to 

±

10kV. 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 imped-

ance in normal application of the circuit. The only con-

straint is that low ESR capacitors must be used for

bypassing and charge storage. ESD testing must be done

with pins V

CC

, V

L

, V

+

, V

, and GND shorted to ground or

connected with low ESR capacitors.

LT1180A • ESD TC

RS232

LINE PINS

PROTECTED

TO 

±

10kV

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

0.1

µ

F

0.1

µ

F

NC

C1

+

V

+

C1

C2

+

C2

V

DR2 OUT

LT1180A

ON/OFF

5V V

CC

GND

DR1 OUT

RX1 IN

RX1 OUT

DR1 IN

DR2 IN

RS232 

LINE PINS 

PROTECTED 

TO 

±

10kV

RX2 IN

RX2 OUT

+

0.1

µ

F

+

0.1

µ

F

0.1

µ

F

+

+

+

background image

7

LT1180A/LT1181A

 11801afb

U

A

O

PPLICATI

TYPICAL

30k

30k

RS232 OUTPUT

RS232 OUTPUT

RS232 INPUT

RS232 INPUT

LT1180A • TA04

LT1039

TTL INPUT

30k

RS232 INPUT

V

CC

TTL INPUT

TTL INPUT

TTL OUTPUT

TTL OUTPUT

TTL OUTPUT

ON/OFF

RS232 OUTPUT

5k

RS232 OUTPUT

RS232 INPUT

LT1180A

TTL INPUT

5k

RS232 INPUT

V

CC

TTL INPUT

TTL OUTPUT

TTL OUTPUT

ON/OFF

RS232 OUTPUT

2

4

5

6

3

7

18

17

GND

16

GND

10

V

+

V

1

9

18

17

5V

SHUTDOWN

C2

C2

+

C1

C1

+

V

+

V

11

12

13

10

15

14

9

8

12

14

16

11

13

15

7

5

3

8

6

4

1

µ

F

1

µ

F

1

µ

F

1

µ

F

+

+

+

+

Supporting an LT1039 (Triple Driver/Receiver)

background image

8

LT1180A/LT1181A

 11801afb

PACKAGE DESCRIPTIO

U

J18 1298

0.015 – 0.060

(0.380 – 1.520)

0.100

(2.54)

BSC

0.014 – 0.026

(0.360 – 0.660)

0.045 – 0.065

(1.143 – 1.651)

0.200

(5.080)

MAX

0.125

(3.175)

MIN

0.008 – 0.018

(0.203 – 0.457)

0

°

 – 15

°

1

2

3

4

5

6

7

8

0.220 – 0.310

(5.590 – 7.870)

0.960

(24.384)

MAX

0.005

(0.127)

MIN

16

13

9

10

11

12

14

15

17

18

0.025

(0.635)

RAD TYP

0.300 BSC

(0.762 BSC)

0.045 – 0.068

(1.143 – 1.727)

FULL LEAD

OPTION

0.023 – 0.045

(0.584 – 1.143)

HALF LEAD

OPTION

CORNER LEADS OPTION 

(4 PLCS)

NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE 

           OR TIN PLATE LEADS

J16 1298

0.015 – 0.060

(0.380 – 1.520)

0.100

(2.54)

BSC

0.014 – 0.026

(0.360 – 0.660)

0.045 – 0.065

(1.143 – 1.651)

0.200

(5.080)

MAX

0.125

(3.175)

MIN

0.008 – 0.018

(0.203 – 0.457)

0

°

 – 15

°

1

2

3

4

5

6

7

8

0.220 – 0.310

(5.588 – 7.874)

0.840

(21.336)

MAX

0.005

(0.127)

MIN

16

13

9

10

11

12

14

15

0.025

(0.635)

RAD TYP

0.300 BSC

(0.762 BSC)

0.045 – 0.068

(1.143 – 1.727)

FULL LEAD

OPTION

0.023 – 0.045

(0.584 – 1.143)

HALF LEAD

OPTION

CORNER LEADS OPTION 

(4 PLCS)

NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE 

           OR TIN PLATE LEADS

J Package

16-Lead CERDIP (Narrow .300 Inch, Hermetic)

(Reference LTC DWG # 05-08-1110)

J Package

18-Lead CERDIP (Narrow .300 Inch, Hermetic)

(Reference LTC DWG # 05-08-1110)

OBSOLETE PACKAGES

background image

9

LT1180A/LT1181A

 11801afb

PACKAGE DESCRIPTIO

U

N16 1098

  0.255 

±

 0.015*

(6.477 

±

 0.381)

  0.770*

(19.558)

MAX

16

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

0.020

(0.508)

MIN

0.125

(3.175)

MIN

0.130 

±

 0.005

(3.302 

±

 0.127)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.018 

±

 0.003

(0.457 

±

 0.076)

0.100

(2.54)

BSC

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.325

(7.620 – 8.255)

0.325

+0.035

–0.015

+0.889

–0.381

8.255

(

)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

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

N18 1098

0.020

(0.508)

MIN

0.125

(3.175)

MIN

0.130 

±

 0.005

(3.302 

±

 0.127)

0.065

(1.651)

TYP

0.045 – 0.065

(1.143 – 1.651)

0.018 

±

 0.003

(0.457 

±

 0.076)

0.005

(0.127)

MIN

0.100

(2.54)

BSC

  0.255 

±

 0.015*

(6.477 

±

 0.381)

  0.900*

(22.860)

MAX

18

1

2

3

4

5

6

7

8

9

10

11

12

13

14

16

15

17

0.009 – 0.015

(0.229 – 0.381)

0.300 – 0.325

(7.620 – 8.255)

0.325

+0.035

–0.015

+0.889

–0.381

8.255

(

)

*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.

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

N Package

16-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

N Package

18-Lead PDIP (Narrow .300 Inch)

(Reference LTC DWG # 05-08-1510)

background image

10

LT1180A/LT1181A

 11801afb

PACKAGE DESCRIPTIO

U

S16 (WIDE) 1098

NOTE 1

  0.398 – 0.413*

(10.109 – 10.490)

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

0.394 – 0.419

(10.007 – 10.643)

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

BSC

0.014 – 0.019

(0.356 – 0.482)

TYP

0

°

 – 8

°

 TYP

NOTE 1

0.009 – 0.013

(0.229 – 0.330)

0.016 – 0.050

(0.406 – 1.270)

    0.291 – 0.299**

(7.391 – 7.595)

×

 45

°

0.010 – 0.029

(0.254 – 0.737)

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

*

**

SW Package

16-Lead Plastic Small Outline (Wide .300 Inch)

(Reference LTC DWG # 05-08-1620)

background image

11

LT1180A/LT1181A

 11801afb

PACKAGE DESCRIPTIO

U

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.

S18 (WIDE) 1098

NOTE 1

  0.447 – 0.463*

(11.354 – 11.760)

15

14

13

12

11

10

16

9

1

2

3

4

5

6

7

8

0.394 – 0.419

(10.007 – 10.643)

17

18

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

BSC

0.014 – 0.019

(0.356 – 0.482)

TYP

0

°

 – 8

°

 TYP

NOTE 1

0.009 – 0.013

(0.229 – 0.330)

0.016 – 0.050

(0.406 – 1.270)

    0.291 – 0.299**

(7.391 – 7.595)

×

 45

°

0.010 – 0.029

(0.254 – 0.737)

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

*

**

SW Package

18-Lead Plastic Small Outline (Wide .300 Inch)

(Reference LTC DWG # 05-08-1620)

background image

12

LT1180A/LT1181A

 11801afb

© 

LINEAR TECHNOLOGY CORPORATION 1994

LT/CPI 11/01 REV B 1.5K • PRINTED IN USA

U

A

O

PPLICATI

TYPICAL

PART NUMBER

DESCRIPTION

COMMENTS

LT1280A/LT1281A

5V 2-Driver/2-Receiver RS232 Transceivers

Pin Compatible with LT1180A/LT1181A, I

CC

 = 10mA Max

LT1381

5V 2-Driver/2-Receiver RS232 Transceiver

Narrow 16-Pin SO Package

LT1780/LT1781

5V 2-Driver/2-Receiver RS232 Transceivers

IEC 1000-4-2 Level 4 Compliance

Operation Using 5V and 12V Power Supplies

RELATED PARTS

5k

5k

LOGIC INPUTS

LOGIC OUTPUTS

ON/OFF

18

10

13

11

12

6

5

4

2

16

9

14

8

15

7

3

17

5V INPUT

–12V

OUT

RS232 OUTPUT

RS232 OUTPUT

RS232 INPUT

RS232 INPUT

 LT1180A • TA03 

LT1180A

12V INPUT

0.1

µ

F

+

0.1

µ

F

+

Linear Technology  Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 

q

 FAX: (408) 434-0507 

 q 

 www.linear.com