LTC1323CS datasheet(6/12 Pages) LINER

6 / 12 page

LTC1323

PI FU CTIO S

LTC1323CSW

C1+: C1 Positive Input. Connect a 0.33

µF capacitor be-

tween C1+ and C1–.

C1–: C1 Negative Input. Connect a 0.33

µF capacitor be-

tween C1+ and C1–.

CPEN: TTL Level Charge Pump Enable Input. With CPEN

held low, the charge pump is enabled and the chip oper-

ates normally. When CPEN is pulled high, the charge

pump is disabled as well as both drivers, the noninverting

single-ended receiver, and the differential receiver. The

inverting single-ended receiver (RXI) is kept alive to

monitor the control line and ICC drops to 65µA. To turn

off the receiver and drop ICC to 0.5µA, pull the SHDN pin

high.

TXD: Differential Driver Input (TTL compatible).

TXI: Single-Ended Driver Input (TTL compatible).

TXDEN: Differential Driver Output Enable (TTL compat-

ible). A high level on this pin forces the differential driver

into three-state; a low level enables the driver. This input

does not affect the single-ended driver.

SHDN: Shutdown Input (TTL compatible). When this pin

is high, the chip is shut down. All driver and receiver

outputs are three-state, the charge pump turns off, and the

supply current drops to 0.5

µA. A low level on this pin

allows normal operation.

RXEN: Receiver Enable (TTL compatible). A high level

on this pin disables the receivers and three-states the

logic outputs; a low level allows normal operation.

RXO: Inverting Single-Ended Receiver Output. Remains

active in the receiver keep-alive mode.

RXO: Noninverting Single-Ended Receiver Output.

RXDO: Differential Receiver Output.

GND: Signal Ground. Connect to PGND with 24-pin

package.

PGND: Power ground is connected internally to the charge

pump and differential driver. Connect to the GND pin.

RXD+: Differential 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–: Differential Receiver Inverting Input.

RXI: Noninverting Receiver Input. This input controls the

RXO output.

RXI: Inverting Receiver Input. This input controls the RXO

output. In receiver keep-alive mode (CPEN high, SHDN

low), this receiver can be used to monitor a wake-up

control signal.

CHARGE PUMP

C1+

C1–

CPEN

TXD

TXI

TXDEN

SHDN

RXEN

RXO

RX0

RXDO

GND

VCC

VEE

C2+

C2–

TXD–

TXD+

TXO

RXI

RXD–

RXD+

PGND

LTC1323CG

CHARGE PUMP

C1+

C1–

CPEN

TXD

TXI

TXDEN

SHDN

RXEN

RXO

RX0

RXDO

GND

VCC

VEE

C2+

C2–

TXD–

TXD+

TXO

RXI

RXD–

RXD+

PGND

LTC1323CS

CHARGE PUMP

C1+

C1–

TXD

TXDEN

SHDN

RXEN

RXDO

GND

VCC

VEE

C2+

C2–

TXD–

TXD+

RXD–

RXD+

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