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PDF LTC1324 Data sheet ( Hoja de datos )
| Número de pieza | LTC1324 | |
| Descripción | Single Supply LocalTalk Transceiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1324 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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OBSOLETE:
FOR INFORMATION PURPOSES ONLY
Contact Linear Technology for Potential Replacement
LTC1324
Single Supply LocalTalk®
Transceiver
FEATURES
n Single Chip 5V LocalTalk Port
n Low Power: ICC = 1mA Typ
n Shutdown Pin Reduces ICC to 1µA Typ
n Digitally Selectable Low Slew Rate Mode for
Reduced EMI Emmisions
n Drivers Maintain High Impedance in Three-State or
with Power Off
n Thermal Shutdown Protection
n Drivers Are Short-Circuit Protected
APPLICATIONS
n LocalTalk Peripherals
n Notebook and Palmtop Computers
n 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.
L, 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
SLEW RATE CONTROL
DATA IN
TX⎯ENABLE
SHUTDOWN
RX⎯ENABLE
DATA OUT
2
3
4
5
6
7
8
5V
16
LTC1324
12
11
10
9
LocalTalk
TRANSFORMER
120Ω
1324 TA01
DIN
5V/DIV
DOUT
1V/DIV
Waveform of Driver
TIME (0.5μs/DIV)
1324 TA02
1324fa
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1324
Driver Differential Output Voltage
vs Temperature
3.1
3.0 RL = 100Ω
2.9
2.8
2.7
2.6
2.5
2.4
2.3
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (C)
1324 G12
Receiver ⏐tPLH – tPHL⏐
vs Temperature
8
7
6
5
4
3
2
1
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (C)
1324 G13
PIN FUNCTIONS
NC (Pins 1, 13): No Internal Connection.
SR (Pin 2): Slew Rate Control (TTL Compatible). A high
level on this pin forces the RS485 driver into the low slew
rate mode. A low level forces the driver into the high slew
rate or normal mode. Connected to an internal pull-down.
TXD (Pin 3): RS485 Driver Input (TTL Compatible).
TXDEN (Pin 4): Driver Output Enable (TTL Compatible). A
high level on this pin and a low level on TXDEN (Pin 15)
forces the RS485 driver into three-state. A low level en-
ables the driver.
SHDN (Pin 5): Shutdown Input (TTL Compatible). When
this pin is high, the chip is shut down; the driver and re-
ceiver outputs three-state; and the supply current drops
to 1μA. A low level on this pin allows normal operation.
RXEN (Pin 6): Receiver Enable (TTL Compatible). A high
level on this pin and a low level on RXEN (Pin 14) disables
the receiver and three-states the logic outputs. A low level
allows normal operation.
RXDO (Pin 7): RS485 Receiver Output.
GND (Pin 8): Ground.
RXD+ (Pin 9): RS485 Receiver Noninverting Input. When
this pin is ≥ 200mV above RXD–, RXDO will be high. When
this pin is ≥ 200mV below RXD–, RXDO will be low.
RXD– (Pin 10): RS485 Receiver Inverting Input.
TXD+ (Pin 11): RS485 Driver Noninverting Output.
TXD– (Pin 12): RS485 Driver Inverting Output.
RXEN (Pin 14): Receiver Enable (TTL Compatible). A low
level on this pin and a high level on RXEN (Pin 6) disables
the receiver and three-states the logic outputs. A high
level allows normal operation. Connected to an internal
pull-down.
TXDEN (Pin 15): Driver Output Enable (TTL Compatible).
A low level on this pin and a high level on TXDEN (Pin 4)
forces the RS485 driver into three-state. A high level
enables the driver. Connected to an internal pull-down.
VCC (Pin 16): The Positive Supply Input. 4.75V ≤ VCC ≤
5.25V. Requires a 1μF bypass capacitor to ground.
1324fa
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1324.PDF ] | |
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