Datasheet LTC1346A Datasheet (Linear Technology)

LTC1346A

10Mbps DCE/DTE

V.35 Transceiver

EATU

F

■

Single Chip Provides Complete Differential Signal

RE

S

Interface for V.35 Port

■

Drivers and Receivers Will Withstand Repeated ±10kV ESD Pulses

■

10Mbaud Transmission Rate

■

Meets CCITT V.35 Specification

■

Operates from ±5V Supplies

■

Shutdown Mode Reduces ICC to Below 1µA

■

Selectable Transmitter and Receiver Configurations

■

Independent Driver/Receiver Enables

■

Transmitter Maintains High Impedance When Disabled, Shut Down or with Power Off

■

Transmitters Are Short-Circuit Protected

U

O

PPLICATI

A

■

Modems

■

Telecommunications

■

Data Routers

S

DUESCRIPTIO

The LTC®1346A is a single chip transceiver that provides the differential clock and data signals for a V.35 interface from ±5V supplies. Combined with an external resistor termination network and an LT®1134A RS232 transceiver for the control signals, the LTC1346A forms a complete low power DTE or DCE V.35 interface port.

The LTC1346A features three current output differential transmitters and three differential receivers. The transceiver can be configured for DTE or DCE operation or shutdown using three Select pins. In the shutdown mode, the supply current is reduced to below 1µA.

The LTC1346A transceiver operates up to 10Mbaud. All transmitters feature short-circuit protection. Both the transmitter outputs and the receiver outputs can be forced into a high impedance state. The transmitter outputs and receiver inputs feature ±10kV ESD protection.

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

TYPICAL APPLICATION

V

EE1

–5V

0.1µF



+

V



CC1

5V

1

2

0.1µF

+

V

CC1

LTC1346A LTC1346ABI

4

DX

5

DX

9

10

11

7

8

RX

12

DTE DCE

24

23 22

21 18

17 16

15 14

13

3

U

Clock and Data Signals for V.35 Interface

627T500/1250

1

T

2 3

T T

4

14

T T

13 12

T T

11 10

T T

9

78

TXD (103)

SCTE (113)

TXC (114)

RXC (115)

RXD (104)

GND (102)

627T500/1250

1

BI

12

T

111615 10

91413 1

22423 3

42221 5

62019

78

RX

DX

3

12

2

10

11

4

5

6

7

8

V 5V

+

0.1µF

T

V

CC2

BI TECHNOLOGIES

627T500/1250 (SOIC)

CC2



50Ω

=

50Ω

0.1µF

+

125Ω

LTC1346 • TA01

V –5V

EE2



1

LTC1346A

1 2 3 4 5 6 7 8

9 10 11 12

24 23 22 21 20 19 18 17 16 15 14 13



V

EE



V

CC



GND

T1 T2

T3 S1 S2 R3 R2 R1 S0



Y1 Z1 Y2 Z2 Y3 Z3 A3 B3 A2 B2 A1 B1

SW PACKAGE

24-LEAD PLASTIC SO WIDE

TOP VIEW

A

W

O

LUTEXI T

S

A

WUW

ARB

U G

I

S

(Note 1)

Supply Voltage

VCC.................................................................... 6.5V

VEE................................................................... –6.5V

Input Voltage

Transmitters ........................... –0.3V to (VCC + 0.3V)

Receivers............................................... –18V to 18V

S0, S1, S2 ............................... –0.3V to (VCC + 0.3V)

Output Voltage

Transmitters .......................................... –18V to 18V

Receivers................................ –0.3V to (VCC + 0.3V)

Short-Circuit Duration

Transmitter Output ..................................... Indefinite

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

Operating Temperature Range

LTC1346AC ............................................ 0°C to 70°C

LTC1346AI ........................................ – 40°C to 85°C

Storage Temperature Range ................ –65°C to 150°C

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

/

= 150°C, θ

O

RDER I FOR ATIO

= 85°C/W

JA

PACKAGE

T

JMAX

Consult factory for Military grade parts.

WU

ORDER PART

NUMBER

LTC1346ACSW LTC1346AISW

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DC ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OD

V

OC

I

OH

I

OL

I

OZ

R

O

V

TH

∆V I

IN

R

IN

V

OH

V

OL

I

OSR

I

OZR

V

IH

V

IL

I

IN

2

VCC = 5V ±5%, VEE = –5V ±5% (Note 2)

Transmitter Differential Output Voltage –4V ≤ VOS ≤ 4V (Figure 1) ● 0.44 0.55 0.66 V Transmitter Common Mode Output Voltage VOS = 0V (Figure 1) ● –0.6 0 0.6 V Transmitter Output High Current V Transmitter Output Low Current V Transmitter Output Leakage Current –5V ≤ V

Transmitter Output Impedance –2V ≤ V Differential Receiver Input Threshold Voltage –7V ≤ (VA + VB)/2 ≤ 12V ● 25 200 mV Receiver Input Hysterisis –7V ≤ (VA + VB)/2 ≤ 12V 50 mV

TH

Receiver Input Current (A, B) – 7V ≤ V Receiver Input Impedance –7V ≤ V Receiver Output High Voltage IO = 4mA, V Receiver Output Low Voltage IO = 4mA, V Receiver Output Short-Circuit Current 0V ≤ VO ≤ V Receiver Three-State Output Current S0 = VCC, 0V ≤ VO ≤ V Logic Input High Voltage T, S0, S1, S2 ● 2V Logic Input Low Voltage T, S0, S1, S2 ● 0.8 V Logic Input Current T, S0, S1, S2 ● ±10 µA

= 0V ● – 12.6 –11 – 9.4 mA

Y, Z

= 0V ● 9.4 11 12.6 mA

Y, Z

≤ 5V, S1 = S2 = 0V ±1 ±20 µA

Y, Z

≤ 2V 100 kΩ

Y, Z

≤ 12V ● 0.7 mA

A, B

≤ 12V ● 17.5 30 kΩ

A, B

= 0.2V ● 3 4.5 V

A, B

= –0.2V ● 0.2 0.4 V

A, B

CC

● ±100 µA

● 74085 mA

● ±10 µA

LTC1346A

TEMPERATURE (˚C)

–50

TIME (ns)

25

1346A G03

10

5

–25 0 50

0

20

15

75 100 125

VCC = 5V V

EE

= –5V

AC ELECTRICAL CHARACTERISTICS

VCC = 5V ±5%, VEE = –5V ±5% (Note 2)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

I

CC

VCC Supply Current VOS = 0V, S0 = Low, S1 = S2 = High (Figure 1) ● 40 50 mA

No Load, S0 = Low, S1 = S2 = High ● 6 9 mA Shutdown, S0 = VCC, S1 = S2 = 0V ● 0.1 100 µA

I

EE

VEE Supply Current VOS = 0V, S0 = Low, S1 = S2 = High (Figure 1) ● –40 –50 mA

No Load, S0 = Low, S1 = S2 = High ● –6 –9 mA

Shutdown, S0 = VCC, S1 = S2 = 0V ● –0.1 –100 µA tr, t t

PLH

t

PHL

t

SKEW

t

PLH

t

PHL

t

SKEW

t

ZL

Transmitter Rise or Fall Time VOS = 0V (Figures 1, 3) ● 740 ns

f

Transmitter Input to Output VOS = 0V (Figures 1, 3) ● 25 70 ns Transmitter Input to Output VOS = 0V (Figures 1, 3) ● 30 70 ns Transmitter Output to Output VOS = 0V (Figures 1, 3) 5 ns Receiver Input to Output VOS = 0V (Figures 1, 4) ● 50 100 ns Receiver Input to Output VOS = 0V (Figures 1, 4) ● 55 100 ns Differential Receiver Skew, t

PLH

– t

 V

PHL

= 0V (Figures 1, 4) 5 ns

OS

Receiver Enable to Output Low (Active Mode) CL = 15pF, SW1 Closed (Figures 2, 5) ● 40 70 ns Receiver Enable to Output Low CL = 15pF, SW1 Closed (Figures 2, 5) 2 µs

(from Shutdown, Note 3)

t

ZH

Receiver Enable to Output High (Active Mode) CL = 15pF, SW2 Closed (Figures 2, 5) ● 35 70 ns Receiver Enable to Output High CL = 15pF, SW2 Closed (Figures 2, 5) 2 µs

(from Shutdown, Note 3)

t

LZ

t

HZ

The ● denotes specifications which apply over the full operating temperature range.

Note 1: The Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.

Receiver Disable from Low CL = 15pF, SW1 Closed (Figures 2, 5) ● 30 70 ns Receiver Disable from High CL = 15pF, SW2 Closed (Figures 2, 5) ● 35 70 ns

Note 2: All currents into device pins are positive; all currents out of device pins are termed negative. All voltages are referenced to device ground unless otherwise specified.

Note 3: Receiver enable to output valid high or low from shutdown is typically 2µs.

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Transmitter Output Current vs Temperature

13

VCC = 5V

= –5V

V

EE

12

11

10

OUTPUT CURRENT (mA)

9

–25 0 50

–50

25

TEMPERATURE (˚C)

75 100 125

1346A G01

Transmitter Output Current vs Output Voltage

13

TA = 25°C

= 5V

V

CC

= –5V

V

EE

12

11

10

OUTPUT CURRENT (mA)

9

–2.0

–1.5

–1.0

–0.5

OUTPUT VOLTAGE (V)

0

0.5

1.0

1.5

1346A G02

Transmitter Output Skew vs Temperature

2.0

3

LTC1346A

UW

TYPICAL PERFORMANCE CHARACTERISTICS

Receiver t

PLH

– t

PHL

vs Temperature ICC Supply Current vs Temperature

20

15

10

TIME (ns)

5

0

–50

VCC = 5V

= –5V

V

EE

–25 0 50

25

TEMPERATURE (˚C)

75 100 125

1346A G04

45

40

35

CURRENT (mA)

30

25

–25 0 50

–50

LOADED

NO LOAD

25

TEMPERATURE (˚C)

Receiver Output WaveformsTransmitter Output Waveforms

INPUT

5V/DIV

OUTPUT

0.2V/DIV

INPUT

0.2V/DIV

OUTPUT

5V/DIV

VCC = 5V

= –5V

V

EE

75 100 125

1346A G05

7.5

7.0

CURRENT (mA)

6.5

6.0

5.5

IEE Supply Current vs Temperature

–25

VCC = 5V

= –5V

V

EE

–30

NO LOAD

–35

CURRENT (mA)

–40

–45

LOADED

–25 0 50

–50

25

TEMPERATURE (˚C)

75 100 125

Receiver Enable from Shutdown

INPUT A–B

1V/DIV

INPUT S0

5V/DIV

OUTPUT

5V/DIV

–5.0

–5.5

CURRENT (mA)

–6.0

–6.5

–7.0

1346A G06

1346A G07 1346A G08 1346A G09

UUU

PIN FUNCTIONS

VEE (Pin 1): V

(Pin 2): Positive Supply, 4.75V ≤ VCC ≤ 5.25V

CC

GND (Pin 3): Ground T1 (Pin 4): Transmitter 1 Input, TTL Compatible T2 (Pin 5): Transmitter 2 Input, TTL Compatible T3 (Pin 6): Transmitter 3 Input, TTL Compatible S1 (Pin 7): Select Input 1, TTL Compatible S2 (Pin 8): Select Input 2, TTL Compatible R3 (Pin 9): Receiver 3 Output, TTL Compatible R2 (Pin 10): Receiver 2 Output, TTL Compatible R1 (Pin 11): Receiver 1 Output, TTL Compatible S0 (Pin 12): Select Input 0, TTL Compatible

Negative Supply, –4.75V ≥ VEE ≥ –5.25V

B1 (Pin 13): Receiver 1 Inverting Input A1 (Pin 14): Receiver 1 Noninverting Input B2 (Pin 15): Receiver 2 Inverting Input A2 (Pin 16): Receiver 2 Noninverting Input B3 (Pin 17): Receiver 3 Inverting Input A3 (Pin 18): Receiver 3 Noninverting Input Z3 (Pin 19): Transmitter 3 Inverting Output Y3 (Pin 20): Transmitter 3 Noninverting Output Z2 (Pin 21): Transmitter 2 Inverting Output Y2 (Pin 22): Transmitter 2 Noninverting Output Z1 (Pin 23): Transmitter 1 Inverting Output Y1 (Pin 24): Transmitter 1 Noninverting Output

4

LTC1346A

U

FU CTIO TABLES

Transmitter and Receiver Configuration

S0 S1 S2 DX ON RX ON Description

0 0 0 — 1, 2, 3 All RX ON, All DX OFF 1 0 0 — — All OFF, Shutdown 0 1 0 1, 2, 3 1, 2 DCE Mode 1 1 0 1, 2, 3 — DCE Mode, All RX OFF 0 0 1 1, 2 1, 2, 3 DTE Mode 1 0 1 1, 2 — DTE Mode, All RX OFF 0 1 1 1, 2, 3 1, 2, 3 All ON 1 1 1 1, 2, 3 — All DX ON, All RX OFF

Receiver

CONFIGURATION S0 S1 S2 A – B R1 AND R2 R3

All Rx ON 0 0 0 ≤ – 0.2V 0 0 All Rx ON 0 0 0 ≥0.2V 1 1 Shutdown 1 0 0 X Z Z DCE 0 1 0 ≤ –0.2V 0 Z DCE 0 1 0 ≥0.2V 1 Z Disabled 1 1 0 X Z Z DTE or All ON 0 X 1 ≤ – 0.2V 0 0 DTE or All ON 0 X 1 ≥0.2V 1 1 Disabled 1 X 1 X Z Z

Transmitter

INPUTS OUTPUTS

CONFIGURATION S0 S1 S2 T Y1 AND Y2 Z1 AND Z2 Y3 Z3

All OFF 0 0 0 X Z Z Z Z Shutdown 1 0 0 X Z Z Z Z DCE or All ON X 1 X 0 0 1 0 1 DCE or All ON X 1 X 1 1 0 1 0 DTE X 0 1 0 0 1 Z Z DTE X 0 1 1 1 0 Z Z

INPUTS OUTPUTS



TEST CIRCUITS

Y

T

Z

50Ω

125Ω

V

OD

50Ω

Z

V

OS

VOC = (VY + VZ)/2

125Ω

50Ω

A

R

B

15pFS0

LTC1346A • F01

Figure 1. V.35 Transmitter/Receiver Test Circuit

V

CC

SW1

RECEIVER

OUTPUT

1k

C

L

SW2

LTC1346A • F02

Figure 2. Receiver Output Enable and Disable Timing Test Load

5

LTC1346A

UW

W

SWITCHI G TI E WAVEFOR S

A – B

Y – Z

VOD/2

–VOD/2

V

R

V

3V

T

0V

V

O

–V

O

Z

V

Y

O

Figure 3. V.35 Transmitter Propagation Delays

0V

OH

OL

1.5V

t

PLH

50%

10%

f = 1MHz: t

t

PLH

f = 1MHz: t

90%

t

r

t

SKEW

≤ 10ns: tf ≤ 10ns

r

1.5V

≤ 10ns: tf ≤ 10ns

r

V

= V(Y) – V(Z)

DIFF

1/2 V

O

INPUT

OUTPUT

1.5V

0V

t

PHL

90%

t

PHL

50%

10%

t

f

t

LTC1346A • F03

SKEW

1.5V

LTC1346A • F04

Figure 4. V.35 Receiver Propagation Delays

3V

S0

0V

5V

R

V

OL

V

OH

R

0V

1.5V f = 1MHz: t

t

ZL

1.5V

t

ZH

1.5V

≤ 10ns: tf ≤ 10ns

r

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

1.5V

t

LZ

0.5V

HZ

0.5V

LTC1346A • F05

Figure 5. Receiver Enable and Disable Times

6

LTC1346A

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APPLICATIONS INFORMATION

Review of CCITT Recommendation V.35 Electrical Specifications

V.35 is a CCITT recommendation for synchronous data transmission via modems. Appendix 2 of the recommendation describes the electrical specifications which are summarized below:

1. The interface cable is a balanced twisted pair with 80Ω to 120Ω impedance.

2. The transmitter’s source impedance is between 50Ω and 150Ω.

3. The transmitter’s resistance between shorted terminals and ground is 150Ω ±15Ω.

4. When terminated by a 100Ω resistive load, the terminal-to-terminal voltage should be 0.55V ±20%.

5. The transmitter’s rise time should be less than 1% of the signal pulse or 40ns, whichever is greater.

6. The common mode voltage at the transmitter output should not exceed 0.6V.

10. No data errors should occur with ±2V common

mode change at either the transmitter/receiver or ± 4V ground potential difference between transmitter and receiver.

Cable Termination

Each end of the cable connected to an LTC1346A must be terminated by an external Y- or ∆-resistor network for proper operation. The Y-termination has two series connected 50Ω resistors and a 125Ω resistor connected between ground and the center tap of the two 50Ω resistors as shown in Figure 6.

The alternative ∆-termination has a 120Ω resistor across the twisted wires and two 300Ω resistors between each wire and ground. Standard 1/8W, 5% surface mount resistors can be used for the termination network. To maintain the proper differential output swing, the resistor tolerance must be 5% or better. A termination network that combines all the resistors into an SO-14 package is available from:

7. The receiver impedance is 100Ω ±10Ω.

8. The receiver impedance to ground is 150Ω ±15Ω.

9. The transmitter or receiver should not be damaged by connection to earth ground, short-circuiting or cross connection to other lines.

50Ω

120Ω

Y

∆

BI Technologies (Formerly Beckman Industrial) Resistor Networks 4200 Bonita Place Fullerton, CA 92635 Phone: (714) 447-2357 FAX: (714) 447-2500 Part #: BI Technologies 627T500/1250 (SOIC) 899TR50/125 (DIP)

125Ω

300Ω

LTC1346A • F06

Figure 6. Y- and ∆-Termination Networks

7

LTC1346A

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APPLICATIONS INFORMATION

T

Figure 7. Simplified Transmitter Schematic

V

CC

V

EE

BOUNDARY

11mA

CHIP

Y

50Ω

125Ω

50Ω

Z

LTC1346A • F07



Theory of Operation

The transmitter outputs consist of complementary switched-current sources as shown in Figure 7.

With a logic zero at the transmitter input, the inverting output Z sources 11mA and the noninverting output Y sinks 11mA. The differential transmitter output voltage is then set by the termination resistors. With two differential 50Ω resistors at each end of the cable, the voltage is set to (50Ω)(11mA) = 0.55V. With a logic 1 at the transmitter input, output Z sinks 11mA and Y sources 11mA. The common mode voltage of Y and Z is 0V when both current sources are matched and there is no ground potential difference between the cable terminations. The transmitter current sources have a common mode range of ±2V, which allows for a ground difference between cable terminations of ±4V.

Each receiver input has a 30k resistance to ground and requires external termination to meet the V.35 input impedance specification. The receivers have an input hysteresis of 50mV to improve noise immunity.

Three Select pins, S0, S1 and S2, configure the chip as described in Function Tables. When the transmitters and

receivers are OFF, all outputs are forced into high impedance. The S0 pin can be used as receiver output enable. In shutdown mode, ICC drops to 1µA with all transmitters and receivers OFF. When the LTC1346A is enabled from shutdown the transmitters and receivers require 2µs to stabilize.

Complete V.35 Port

Figure 8 shows the schematic of a complete surface mounted, ±5V DTE and DCE V.35 port using only three ICs and six capacitors per port. The LTC1346A is used to transmit the clock and data signals and the LT1134A to transmit the control signals. If test signals 140, 141 and 142 are not used, the transmitter inputs should be tied to VCC.

RS422/RS485 Applications

The receivers on the LTC1346A can be used for RS422 and RS485 applications. Using the test circuit in Figure 9, the LTC1346A receivers are able to successfully extract the data stream from the common mode voltage, meeting RS422 and RS485 requirements as shown in Figures 10 and 11.

8

LTC1346A

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APPLICATIONS INFORMATION

DTE DCE

V

5V

CC1



0.1µF

LTC1346A LTC1346A

4

DX

5

DX

9

10

11

RX

8

12

V

CC1

1µF

1µF 1µF1µF

+

V



EE1

–5V

12

0.1µF

24

23 22

21 18

17 16

15 14

13 3

7

14

13 12

11 10

1

2 3

4

9 7

BI

627T500/

1250

(SOIC)

T

8

50Ω

TXD (103)

TXC (114)

RXC (115)

GND (102)

125Ω

V

EE2

–5V

BI

627T500/

1250

(SOIC)

P

S U

W

AA

Y X

V T

R

12P

T

11 10

T

9 1

T

2 3

T

4 5

T

6 7

8

=

T

S

SCTE (113)

U

W

AA

Y X

V

RXD (104)

T

R

BB

CABLE SHIELD

AA



0.1µF

V



CC2

5V

21

0.1µF

16

10

11

4

5

6

+

V

CC2

RX

DX

8127

15 14

13 24

23 22

21 20

19

3

+

1µF

2

21

19

20

18

16

14

17

15

OPTIONAL SIGNALS

4

3 22

23

241

LT1134A LT1134A

DX

RX

DX

13

1µF

+

DTR (108)

5

7

6

8

10

12

9

11

INTERFACE CONNECTOR

H H

RTS (105)

C C

DSR (107)

E E

CTS (106)

D D

DCD (109)

F F

NN NN

N N

L L

ISO 2593

34-PIN DTE/DCE

TM (142)

RDL (140)

LLB (141)

ISO 2593

34-PIN DTE/DCE

INTERFACE CONNECTOR

+

1µF

4322

6

8

5

7

9

11

10

12

RX

DX

23

241

1µF

+

20

18

21

19

17

15

16

14

13

LTC1346A • TA08

Figure 8. Complete Single ±5V V.35 Interface

9

LTC1346A

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APPLICATIONS INFORMATION

V



CC1

5V

AA

LTC485

B

GND

TTL IN

Figure 9. RS422/RS485 Receiver Interface

RECEIVER

OUTPUT

5V/DIV

RECEIVER

INPUT

5V/DIV

B A

100Ω 100Ω

+

–

7V TO –7V

GND POTENTIAL DIFFERENCE

5V

0V

–5V

–10V

RECEIVER

INPUT

5V/DIV

RECEIVER

OUTPUT

5V/DIV

A B

V



CC2

5V

TTL

GND



V

EE

–5V

LTC1346A • F09

OUT

LTC1346A

B

15V

10V

5V

0V

5V

0V

LTC1346 • F10

Figure 10. –7V Common Mode

Multiprotocol Application

The LTC1346A can be used in multiprotocol applications where V.35, RS232 and RS422 (used in RS530, RS449 among others) signals may appear at the same port. The LTC1346A switched current source driver is not compatible with RS232 or RS422. However, the outputs when disabled can share lines with RS232 drivers with a shutdown feature such as the LT1030 and RS422 drivers with a disable feature such as the LTC486/LTC487 (Figure 12a).

LTC1346 • F11

Figure 11. 12V Common Mode

The LTC1346A driver will not be damaged or load the shared lines when disabled. The LTC1346A receiver can receive V.35, RS232 and RS422 signals as shown in Figure 12b. The LTC1346A receiver is directly compatible with V.35 and RS422. For RS232 signal, the noninverting input of the receiver should be grounded. Because the line termination for each of the protocols is different, some form of termination switching should be included, either the connector (as shown in Figures 12a and 12b) or on the PCB.

10

LTC1346A

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APPLICATIONS INFORMATION

LT1030

LTC487

LT1346A

LOGIC INPUT

V.35 DIFFERENTIAL CONNECTION WITH

TERMINATION

50Ω

125Ω

CONNECTOR

50Ω

RS422

DIFFERENTIAL

CONNECTION

RS232

CONNECTION

NO CONNECTION

1346A F12a

LOGIC

OUTPUT

LT1346A

Figure 12a. Multiprotocol Transmitter

V.35 DIFFERENTIAL CONNECTION WITH

TERMINATION

50Ω 125Ω

CONNECTOR

50Ω

Figure 12b. Multiprotocol Receiver

RS422 DIFFERENTIAL

CONNECTION WITH

TERMINATION

100Ω 5k

RS232

CONNECTION WITH

TERMINATION

1346A F12b

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

LTC1346A

PACKAGE DESCRIPTION

U

Dimensions in inches (millimeters) unless otherwise noted.

SW Package

24-Lead Plastic Small Outline (Wide 0.300)

(LTC DWG # 05-08-1620)

0.598 – 0.614*

(15.190 – 15.600)

22 21 20 19 18

2324

NOTE 1

0.291 – 0.299** (7.391 – 7.595)



0.010 – 0.029

(0.254 – 0.737)

0.009 – 0.013

(0.229 – 0.330)

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

**

 

NOTE 1

× 45°

0.016 – 0.050

(0.406 – 1.270)

0° – 8° TYP

0.093 – 0.104

(2.362 – 2.642)

0.050

(1.270)

2345678

1

TYP

0.014 – 0.019

(0.356 – 0.482)

17

16 15

910

11 12

1314

(10.007 – 10.643)

0.037 – 0.045

(0.940 – 1.143)

0.004 – 0.012

(0.102 – 0.305)

0.394 – 0.419

S24 (WIDE) 0695

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

LT1134A 5V Only, 4-Driver/4-Receiver RS232 Transceiver Forms Complete V.35 Interface with LTC1346A LTC1334 5V Only, Configurable RS232/RS485 Transceiver Includes On-Chip Charge Pump LTC1345 Single Supply V.35 Transceiver Single 5V Only, Includes On-Chip Charge Pump

LT/GP 0296 10K • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 1995

12

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900

●

FAX

: (408) 434-0507

●

TELEX

: 499-3977