XR16V654D datasheet(10/58 Pages) EXAR

Part #	XR16V654D

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

10

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

REV. 1.0.1

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

RESET

(RESET#)

20

27

37

33

43

I

When 16/68# pin is HIGH for Intel bus inter-

face, this input becomes the Reset pin

(active high). In this case, a 40 ns mini-

mum HIGH pulse on this pin will reset the

internal registers and all outputs. The UART

transmitter output will be held HIGH, the

receiver input will be ignored and outputs

are reset during reset period (Table 17).

When 16/68# pin is at LOW for Motorola

bus interface, this input becomes Reset#

pin (active low). This pin functions similarly,

but instead of a HIGH pulse, a 40 ns mini-

mum LOW pulse will reset the internal reg-

isters and outputs.

Motorola bus interface is not available on

the 64 pin package.

VCC

2, 24, 37

4, 35, 52

13, 47,

64

6, 46, 66

10, 61,

86

Pwr

2.25V to 3.6V power supply. All inputs,

except XTAL1, are 5V tolerant.

GND

21, 47

14, 28,

45, 61

6, 23, 40,

57

16, 36,

56, 76

20, 46,

71, 96

Pwr

Power supply common, ground.

GND

Center

Pad

N/A

Pwr

The center pad on the backside of the QFN

package is metallic and should be con-

nected to GND on the PCB. The thermal

pad size on the PCB should be the approxi-

mate size of this center pad and should be

solder mask defined. The solder mask

opening should be at least 0.0025" inwards

from the edge of the PCB thermal pad.

N.C.

-

1, 2, 20,

21, 22,

27, 40,

41, 42,

60, 61,

62, 80

No Connection. These pins are not used in

either the Intel or Motorola bus modes.

Pin Description

NAME

48-QFN

PIN #

64-LQFP

PIN #

68-PLCC

PIN#

80-LQFP

PIN #

100-QFP

PIN #

TYPE

DESCRIPTION

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