REV. 1.1.1 Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain. R" />
參數(shù)資料
型號(hào)： XR68M752IM-0B-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 53/54頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR68M752 48TQFP
標(biāo)準(zhǔn)包裝： 1
系列： *
XR16M752/XR68M752
8
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
REV. 1.1.1
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
RESET
(RESET#)
24
36
B7
I
When 16/68# pin is HIGH for Intel bus interface, this input
becomes RESET (active high). When 16/68# pin is LOW
for Motorola bus interface, this input becomes RESET#
(active low).
A 40 ns minimum active pulse on this pin will reset the
internal registers and all outputs of channel A and B. The
UART transmitter output will be held HIGH, the receiver
input will be ignored and outputs are reset during reset
period (see
EN485#
-
A6
I
Auto RS-485 half-duplex direction output enable for
channel A and B (active low, internal pull-up resistor).
Connect this pin to VCC or leave unconnected for normal
RTS# A/B function. Connect to GND for auto RS-485
half-duplex direction output via the RTS# A/B pins. The
Auto RS-485 half-duplex direction output control feature
can be disabled via DLD[6] after power-up. SEE ”AUTO
ENIR#
-
F7
I
IR mode enable for channel A and B (active low, internal
pull-up resistor). Connect this pin to VCC or leave uncon-
nected for normal TX and RX. Connect to GND for both
channel A and B to power up in the IR mode. The IR
mode can be disabled via DLD[7] after power-up. SEE
VCC
26
42
B5
Pwr
1.62V to 3.63V power supply.
GND
13
17
G3
Pwr
Power supply common, ground.
GND
Center Pad
-
Pwr
The center pad on the backside of the QFN package is
metallic and should be connected 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.
NC
9
12, 25, 37
A1
No Connection.
Pin Description
NAME
32-QFN
PIN #
48-TQFP
PIN #
49-STBGA
PIN #
TYPE
DESCRIPTION
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