XR16C864IQ(2004) 查看數據表（PDF） - Exar Corporation

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XR16C864IQ
(Rev.:2004)

2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO

Exar Corporation 

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REV. 2.0.1

XR16C864

2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO

Pin Description

NAME

100-QFP

TYPE

PIN #

DESCRIPTION

CHCCLK

42

I This input provides the clock for UART channel C. An external 16X baud clock or the

crystal oscillator’s output, XTAL2, must be connected to this pin for normal operation.

This input may also be used with MIDI (Musical Instrument Digital Interface) applications

when an external MIDI clock is provided.

RESET

43

(RESET#)

I When 16/68# pin is at logic 1 for Intel bus interface, this input becomes the Reset pin

(active high). In this case, a 40 ns minimum logic 1 pulse on this pin will reset the internal

registers and all outputs. The UART transmitter output will be held at logic 1, the receiver

input will be ignored and outputs are reset during reset period (Table 18). When 16/68#

pin is at a logic 0 for Motorola bus interface, this input becomes Reset# pin (active low).

This pin functions similarly, but instead of a logic 1 pulse, a 40 ns minimum logic 0 pulse

will reset the internal registers and outputs.

VCC

10, 61, Pwr 2.97V to 5.5V power supply. All input pins, except XTAL1, are 5V tolerant.

86

GND

20, 46, Pwr Power supply common, ground.

71, 96

Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.

Factory Test Mode

If the IOR#, IOW# and CS# pins are all asserted (at a logic 0), the 864 will enter a Factory Test Mode.

7

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