XR16C864CQ(2004) 데이터 시트보기 (PDF) - Exar Corporation

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XR16C864CQ
(Rev.:2004)

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

Exar Corporation 

áç

REV. 2.0.1

ORDERING INFORMATION

PART NUMBER

XR16C864CQ

XR16C864IQ

PACKAGE

100-Lead QFP

100-Lead QFP

XR16C864

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

OPERATING TEMPERATURE RANGE

0°C to +70°C

-40°C to +85°C

DEVICE STATUS

Active

Active

PIN DESCRIPTIONS

Pin Description

NAME

100-QFP

TYPE

PIN #

DESCRIPTION

DATA BUS INTERFACE

A2

37

I Address data lines [2:0]. These 3 address lines select one of the internal registers in

A1

38

UART channels A-D during a data bus transaction.

A0

39

D7

95

I/O Data bus lines [7:0] (bidirectional).

D6

94

D5

93

D4

92

D3

91

D2

90

D1

89

D0

88

IOR#

(N.C.)

66

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

read strobe (active low). The falling edge instigates an internal read cycle and retrieves

the data byte from an internal register pointed by the address lines [A2:A0], puts the data

byte on the data bus to allow the host processor to read it on the rising edge.

When 16/68# pin is at logic 0, the Motorola bus interface is selected and this input is not

used.

IOW#

15

I When 16/68# pin is at logic 1, it selects Intel bus interface and this input becomes write

(R/W#)

strobe (active low). The falling edge instigates the internal write cycle and the rising edge

transfers the data byte on the data bus to an internal register pointed by the address lines.

When 16/68# pin is at logic 0, the Motorola bus interface is selected and this input

becomes read (logic 1) and write (logic 0) signal.

CSA#

(CS#)

13

I When 16/68# pin is at logic 1, this input is chip select A (active low) to enable channel A in

the device.

When 16/68# pin is at logic 0, this input becomes the chip select (active low) for the

Motorola bus interface.

CSB#

(A3)

17

I When 16/68# pin is at logic 1, this input is chip select B (active low) to enable channel B in

the device.

When 16/68# pin is at logic 0, this input becomes address line A3 which is used for chan-

nel selection in the Motorola bus interface.

CSC#

(A4)

64

I When 16/68# pin is at logic 1, this input is chip select C (active low) to enable channel C

in the device.

When 16/68# pin is at logic 0, this input becomes address line A4 which is used for chan-

nel selection in the Motorola bus interface.

3

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