LTC1324 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1324

Single Supply LocalTalk® Transceiver

Linear Technology 

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 – t PHL

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

enables the driver.

SHDN (Pin 5): Shutdown Input (TTL Compatible). When

this pin is high, the chip is shut down; the driver and

receiver 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.

5

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