XR16C2850CM-F Datasheet, PDF (6/51 Pages) Exar Corporation – 2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS

XR16C2850
2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS
xr
REV. 2.1.3
NAME
CLKSEL
CLK8/16
RESET
VCC
GND
N.C.
44-PLCC
PIN #
-
-
39
44
22
none
48-TQFP
PIN #
25
24
36
42
17
12
TYPE
DESCRIPTION
I Clock Pre-scaler select. Connect to VCC for divide by 1 and GND for
divide by 4. MCR[7] can override the state of this pin following reset or
initialization. See Figure 6 and MCR[7].
I Transmit/Receive data sampling rate. Connect to VCC for normal 16X
sampling clock (standard baud rates) or GND for 8X sampling clock to
double the standard baud rates.
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 at logic 1, the receiver input will be ignored and outputs are
reset during reset period (see Table 16).
Pwr 2.97V to 5.5V power supply. All inputs are 5V tolerant for devices with
top mark date code of "F2 YYWW" and newer.
Pwr Power supply common, ground.
No Connection.
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
6