LTC1324 Datasheet, PDF (1/8 Pages) Linear Technology – Single Supply LocalTalk Transceiver

LTC1324
Single Supply LocalTalk^®
Transceiver
FEATURES
s _{Single Chip 5V LocalTalk Port}
s _{Low Power: ICC = 1mA Typ}
s _{Shutdown Pin Reduces ICC to 1µA Typ}
s _{Digitally Selectable Low Slew Rate Mode for}
Reduced EMI Emmisions
s _{Drivers Maintain High Impedance in Three-State or}
with Power Off
s _{Thermal Shutdown Protection}
s _{Drivers Are Short-Circuit Protected}
U
APPLICATIONS
s _{LocalTalk Peripherals}
s _{Notebook and Palmtop Computers}
s _{Battery-Powered Systems}
DESCRIPTION
The LTC^®1324 is a single 5V line transceiver designed to
operate on Apple^®LocalTalk networks. The driver features
a digitally selectable low slew rate mode for reduced EMI
emissions. The chip draws only 1mA quiescent current
when active and 1µA in shutdown. The differential driver
outputs three-state when disabled, during shutdown 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.
The LTC1324 is available in a 16-pin SO Wide package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Apple and LocalTalk are registered trademarks of Apple Computer, Inc.
TYPICAL APPLICATION
Typical LocalTalk Connection for Low EMI
5V
16
2
12
SLEW RATE CONTROL
3
DATA IN
4
11
TX ENABLE
5
SHUTDOWN
LTC1324
6
10
RX ENABLE
7
DATA OUT
8
9
LocalTalk
TRANSFORMER
120Ω
1324 TA01
D_IN
5V/DIV
D_OUT
1V/DIV
Waveform of Driver
TIME (0.5µs/DIV)
1324 TA02
1