1

LTC1323

Single 5V

AppleTalk

DX

CHARGE PUMP

DX

RX

RX

RX

0.33

µF

CPEN

TXD

TXI

TXDEN

SHDN

RXEN

RXO

RXO

RXDO

3

2

1

4

5

6

7

8

9

10

11

12

TXO

RXI

RXI

24

21

23

22

20

19

18

17

5

Ω TO 10Ω

=

5

Ω TO 10Ω

16

14

15

13

LTC1323 • TA01

0.33

µF

100pF

1

µF

1

µF

5V

LTC1323

8

7

6

5

4

2

1

3

EMI FILTER

EMI FILTER

EMI FILTER

EMI FILTER

EMI FILTER

EMI FILTER

EMI FILTER

EMI FILTER

+

+

S

FEATURE

DESCRIPTIO

s

Single Chip Provides Complete

LocalTalk

s

Operates From a Single 5V Supply

s

ESD Protection to

±10kV on Receiver Inputs

and Driver Outputs

s

s

s

s

Differential Driver Drives Either Differential

AppleTalk or Single-Ended EIA562 Loads

s

Drivers Maintain High Impedance in Three-State or

with Power Off

s

Thermal Shutdown Protection

s

Drivers are Short-Circuit Protected

The LTC

to operate on AppleTalk or EIA562-compatible single-

ended networks while operating from a single 5V supply.

There are two versions of the LTC1323 available: a 16-pin

version designed to connect to an AppleTalk network,

and a 24-pin version which also includes the additional

single-ended drivers and receivers necessary to create

an Apple-compatible serial port. An on-board charge

pump generates a – 5V supply which can be used to

power external devices. Additionally, the 24-pin LTC1323

features a micropower keep-alive mode during which

one of the single-ended receivers is kept active to monitor

external wake-up signals. The LTC1323 draws only 2.4mA

quiescent current when active, 65

µA in receiver keep-

alive mode, and 0.5

µA in shutdown, making it ideal for

use in battery-powered systems.

The differential driver can drive either differential AppleTalk

loads or conventional single-ended loads. The driver

outputs three-state when disabled, during shutdown, in

receiver keep-alive mode, or when the power is off. The

driver outputs will maintain high impedance even with

output common-mode voltages beyond the power supply

rails. Both the driver outputs and receiver inputs are

protected against ESD damage to

±10kV.

S

APPLICATI

s

LocalTalk Peripherals

s

Notebook/Palmtop Computers

s

Battery-Powered Systems

APPLICATI

TYPICAL

AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.

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