XR68C92_05 datasheet(5/33 Pages) EXAR

Part #	XR68C92

Description	DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER

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Manufacturer	EXAR [Exar Corporation]

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XR68C92/192

5

Rev. 1.33

SYMBOL DESCRIPTION (* 44 pin LQFP)

XTAL2

37

33

31

O

Crystal input 2 or buffered clock output. See XTAL1.

RXA,RXB

35,11

31,10

29,5

I

Serial data input. The serial information (data) received from

serial port to XR68C92/192 receive input circuit. A mark

(high) is logic one and a space (low) is logic zero.This input

must be held at logic one when idle and during power down.

TXA, TXB

33,13

30,11

28,6

O

Serial data output. The serial data is transmitted via this pin

with additional start , stop and parity bits. This output will be

held in mark (high) state during reset, local loop back mode

or when the transmitter is disabled.

IP0

8

7

2

I

Multi-purpose input or Channel A Clear-To-Send (-CTSA

active low). If not used, this pin should be tied to VCC.

IP1

5

4

43

I

Multi-purpose input or Channel B Clear-To-Send (-CTSB

active low). If not used, this pin should be tied to VCC.

IP2

40

36

34

I

Multi-purpose input or Channel B receive external clock

input (received data is sampled on the rising edge of the

clock) or Timer/Counter External clock input. If not used, this

pin should be tied to VCC or GND.

IP3

3

2

41

I

Multi-purpose input or Channel A transmit external clock

input. The transmit data is clocked on the falling edge of the

clock. If not used, this pin should be tied to VCC or GND.

IP4

43

39

37

I

Multi-purpose input or Channel A receive external clock

input. The received data is clocked on the rising edge of the

clock. If not used, this pin should be tied to VCC or GND.

IP5

42

38

36

I

Multi-purpose input or Channel B transmit external clock

input. The transmit data is clocked on the falling edge of the

clock. If not used, this pin should be tied to VCC or GND.

OP0

32

29

27

O

Multi-purpose output. General purpose output or Channel A

Request-To-Send (-RTSA active low).

OP1

14

12

7

O

Multi-purpose output. General purpose output or Channel B

Request-To-Send (-RTSB active low).

OP2

31

28

26

O

Multi-purpose output. General purpose output or one of the

Symbol

Signal

Pin Description

44

40

44*

type

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