XR68C92_05 Datasheet, PDF (5/33 Pages) Exar Corporation – DUAL UNIVERSAL ASYNCHRONOUS RECEIVER AND TRANSMITTER

XR68C92/192
SYMBOL DESCRIPTION (* 44 pin LQFP)
Symbol
XTAL2
RXA, RXB
TXA, TXB
IP0
IP1
IP2
IP3
IP4
IP5
OP0
OP1
OP2
Pin
Signal
44 40 44* type
Pin Description
37
33
31
O Crystal input 2 or buffered clock output. See XTAL1.
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.
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.
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.
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.
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.
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.
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.
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.
32
29
27
O Multi-purpose output. General purpose output or Channel A
Request-To-Send (-RTSA active low).
14 12
7
O Multi-purpose output. General purpose output or Channel B
Request-To-Send (-RTSB active low).
31
28
26
O Multi-purpose output. General purpose output or one of the
Rev. 1.33
5