XR16V654IJ datasheet(9/58 Pages) EXAR

Part #	XR16V654IJ

Description	2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO

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Manufacturer	EXAR [Exar Corporation]

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XR16V654/654D

9

REV. 1.0.1

2.25V TO 3.6V QUAD UART WITH 64-BYTE FIFO

DSRA#

DSRB#

DSRC#

DSRD#

-

1

17

32

48

10

26

44

60

3

19

43

59

7

23

58

74

I

UART channels A-D Data-Set-Ready

(active low) or general purpose input. This

input should be connected to VCC when

not used. This input has no effect on the

UART.

CDA#

CDB#

CDC#

CDD#

-

64

18

31

49

9

27

43

61

79

23

39

63

99

32

49

83

I

UART channels A-D Carrier-Detect (active

low) or general purpose input. This input

should be connected to VCC when not

used. This input has no effect on the UART.

RIA#

RIB#

RIC#

RID#

-

63

19

30

50

8

28

42

62

78

24

38

64

98

33

48

84

I

UART channels A-D Ring-Indicator (active

low) or general purpose input. This input

should be connected to VCC when not

used. This input has no effect on the UART.

ANCILLARY SIGNALS

XTAL1

18

25

35

31

40

I

Crystal or external clock input. Caution: this

input is not 5V tolerant.

XTAL2

19

26

36

32

41

O

Crystal or buffered clock output.

16/68#

14

-

31

-

36

I

Intel or Motorola Bus Select (input with

internal pull-up).

When 16/68# pin is HIGH, 16 or Intel Mode,

the device will operate in the Intel bus type

of interface.

When 16/68# pin is LOW, 68 or Motorola

mode, the device will operate in the Motor-

ola bus type of interface.

Motorola bus interface is not available on

the 64 pin package.

CLKSEL

-

21

30

26

35

I

Baud-Rate-Generator Input Clock Pres-

caler Select for channels A-D. This input is

only sampled during power up or a reset.

Connect to VCC for divide by 1 (default)

and GND for divide by 4. MCR[7] can over-

ride the state of this pin following a reset or

initialization. See MCR bit-7 and

Figure 7

in the Baud Rate Generator section.

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 opera-

tion. This input may also be used with MIDI

(Musical Instrument Digital Interface) appli-

cations when an external MIDI clock is pro-

vided. This pin is only available in the 100-

pin QFP package.

Pin Description

NAME

48-QFN

PIN #

64-LQFP

PIN #

68-PLCC

PIN#

80-LQFP

PIN #

100-QFP

PIN #

TYPE

DESCRIPTION

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