XR16C864CQ(2004) Ver la hoja de datos (PDF) - Exar Corporation
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XR16C864CQ Datasheet PDF : 51 Pages
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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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