XR16L2750 Datasheet, PDF (4/49 Pages) Exar Corporation – 2.25V TO 5.5V DUART WITH 64-BYTE FIFO

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XR16L2750
2.25V TO 5.5V DUART WITH 64-BYTE FIFO
REV. 1.0.0
Pin Description
NAME
44-PLCC
PIN #
48-TQFP
PIN #
TYPE
DESCRIPTION
MODEM OR SERIAL I/O INTERFACE
TXA
13
7
RXA
11
5
RTSA#
36
33
CTSA#
40
38
DTRA#
37
34
DSRA#
41
39
CDA#
42
40
RIA#
43
41
OP2A#
35
32
TXB
14
8
O _{UART channel A Transmit Data or infrared encoder data. Standard}
transmit and receive interface is enabled when MCR[6] = 0. In this
mode, the TX signal will be a logic 1 during reset or idle (no data). Infra-
red IrDA transmit and receive interface is enabled when MCR[6] = 1. In
the Infrared mode, the inactive state (no data) for the Infrared encoder/
decoder interface is a logic 0. If it is not used, leave it unconnected.
I _{UART channel A Receive Data or infrared receive data. Normal receive}
data input must idle at logic 1 condition. The infrared receiver pulses
typically idles at logic 0 but can be inverted by software control prior
going in to the decoder, see MCR[6] and FCTR[2]. If this pin is not
used, tie it to VCC or pull it high via a 100k ohm resistor.
O _{UART channel A Request-to-Send (active low) or general purpose out-}
put. This output must be asserted prior to using auto RTS flow control,
see EFR[6], MCR[1], FCTR[1:0], EMSR[5:4] and IER[6]. For auto
RS485 half-duplex direction control, see FCTR[3] and EMSR[3].
I _{UART channel A Clear-to-Send (active low) or general purpose input.}
It can be used for auto CTS flow control, see EFR[7], and IER[7]. This
input should be connected to VCC when not used.
O _{UART channel A Data-Terminal-Ready (active low) or general purpose}
output. If it is not used, leave it unconnected.
I _{UART channel A 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.
I _{UART channel A 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.
I _{UART channel A 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.
O _{Output Port 2 Channel A - The output state is defined by the user and}
through the software setting of MCR[3]. INTA is set to the active mode
and OP2A# output to a logic 0 when MCR[3] is set to a logic 1. INTA is
set to the three state mode and OP2A# to a logic 1 when MCR[3] is set
to a logic 0. See MCR[3]. This output should not be used as a general
output else it will disturb the INTA output functionality.
O _{UART channel B Transmit Data or infrared encoder data. Standard}
transmit and receive interface is enabled when MCR[6] = 0. In this
mode, the TX signal will be a logic 1 during reset or idle (no data). Infra-
red IrDA transmit and receive interface is enabled when MCR[6] = 1. In
the Infrared mode, the inactive state (no data) for the Infrared encoder/
decoder interface is a logic 0. If it is not used, leave it unconnected.
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