XR16L580_07 Datasheet, PDF (6/52 Pages) Exar Corporation – SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE

XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
Pin Descriptions
REV. 1.4.1
NAME
24-
QFN
PIN#
28-
QFN
PIN#
32-
QFN
PIN#
48-
TQFP TYPE
PIN#
DESCRIPTION
RESET 18
21
23
35
I _{When 16/68# pin is at logic 1 for Intel bus interface, this input}
(RESET#)
becomes RESET (active high). When 16/68# pin is at logic 0 for
Motorola bus interface, this input becomes RESET# (active low).
A 40 ns minimum active pulse on this pin will reset the internal reg-
isters and all outputs of the UART. The UART transmitter output will
be held at logic 1, the receiver input will be ignored and outputs are
reset during reset period (see UART Reset Conditions).
VCC
19
23
28
42 Pwr _{2.25V to 5.5V power supply. All input pins, except XTAL1, are 5V}
tolerant.
GND
12
12
13
18 Pwr _{Power supply common, ground.}
GND
Center Center Center N/A
Pad Pad 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 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.
NC
- 14, 15 15, 16 5, 6, 9,
No Connects. Note that in Motorola mode, the IOR# pin becomes
10, 12, _{- an NC pin.}
17, 20-
25, 29,
31, 34,
36, 37,
48
NOTE: Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
6