xr16v2652il32 Exar Corporation, xr16v2652il32 Datasheet - Page 5

• Manufacturer Part Number: xr16v2652il32
• Description: High Performance Duart With 32-byte Fifo
• Manufacturer: Exar Corporation

REV. 1.0.2
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
Pin Description
ANCILLARY SIGNALS
DTRB#
DSRB#
RESET
CTSB#
XTAL1
XTAL2
CDB#
MFB#
N
RIB#
GND
GND
VCC
NC
AME
Center Pad
32-QFN
18, 19
P
17
12
26
20
IN
4
5
-
-
-
-
-
#
44-PLCC
44, 33
22, 12
P
N/A
28
27
29
30
31
19
11
13
21
IN
-
#
T
Pwr
Pwr
Pwr
YPE
O
O
O
-
I
I
I
I
I
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.
UART channel B Data-Terminal-Ready (active low) or general purpose
output. If this pin is not used, leave it unconnected.
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.
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.
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.
Multi-Function Output Channel B. This output pin can function as the
OP2B#, BAUDOUTB#, or RXRDYB# pin. One of these output signal
functions can be selected by the user programmable bits 1-2 of the
Alternate Function Register (AFR). These signal functions are
described as follows:
1) OP2B# - When OP2B# (active low) is selected, the MF# pin is LOW
when MCR bit-3 is set HIGH (see MCR bit-3). MCR bit-3 defaults to a
logic 0 condition after a reset or power-up.
2) BAUDOUTB# - When BAUDOUTB# function is selected, the Baud
rate clock output is available at this pin.
3) RXRDYB# - RXRDYB# (active low) is intended for monitoring block
data transfers. See
Crystal or external clock input.
Crystal or buffered clock output.
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).
2.25 to 3.6V power supply. All input pins are 5V tolerant.
Power supply common, ground.
The center pad on the backside of the 32-QFN package is metallic and
should be connected to GND on the PCB. The thermal pad size on the
PCB should be the approximate 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.
No Connect.
5
HIGH PERFORMANCE DUART WITH 32-BYTE FIFO
Table 2
for more details.
D
ESCRIPTION
XR16V2652