XR16V2550 Datasheet, PDF (5/48 Pages) Exar Corporation – HIGH PERFORMANCE DUART WITH 16-BYTE FIFO

REV. P1.0.0
Pin Description
PRELIMINARY
XR16V2550
HIGH PERFORMANCE DUART WITH 16-BYTE FIFO
NAME
RTSB#
32-QFN
PIN #
15
CTSB#
16
DTRB#
-
DSRB#
-
CDB#
-
RIB#
-
OP2B#
-
ANCILLARY SIGNALS
XTAL1
10
XTAL2
11
RESET
24
VCC
GND
NC
26
13
9, 17
48-TQFP
PIN #
22
23
35
20
16
21
9
TYPE
DESCRIPTION
O _{UART channel B Request-to-Send (active low) or general purpose out-}
put. This port must be asserted prior to using auto RTS flow control,
see EFR[6], MCR[1], and IER[6].
I _{UART channel B 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 B Data-Terminal-Ready (active low) or general purpose}
output. If it is not used, leave it unconnected.
I _{UART channel B 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 B 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 B 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 B - The output state is defined by the user and}
through the software setting of MCR[3]. INTB is set to the active mode
and OP2B# output LOW when MCR[3] is set to a logic 1. INTB is set to
the three state mode and OP2B# output HIGH when MCR[3] is set to a
logic 0. See MCR[3]. If INTB is used, this output should not be used as
a general output else it will disturb the INTB output functionality.
13
14
36
42
17
12, 24, 25,
37
I _{Crystal or external clock input.}
O _{Crystal or buffered clock output.}
I _{Reset (active high) - A longer than 40 ns 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 (see Table 15).
Pwr _{2.25V to 3.6V power supply. All input pins are 5V tolerant.}
Pwr _{Power supply common, ground.}
No Connection.
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
5