xr16m670 Exar Corporation, xr16m670 Datasheet - Page 4

• Manufacturer Part Number: xr16m670
• Description: 1.62v To 3.63v High Performance Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

XR16M670
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 32-BYTE FIFO
Pin Description
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
ANCILLARY SIGNALS
PwrSave
RESET
XTAL1
XTAL2
DSR#
N
VCC
GND
GND
CD#
RI#
NC
AME
24-QFN
Center
P
Pad
17
19
10
IN
8
7
-
-
-
-
-
#
32-QFN
2, 9, 15,
Center
P
Pad
25
26
27
10
23
28
13
16
11
IN
-
#
25-BGA
P
C4
D5
A2
B1
E5
IN
-
-
-
-
-
-
#
T
Pwr
Pwr
Pwr
YPE
O
-
I
I
I
I
I
I
UART Data-Set-Ready (active low) or general purpose input. This
input should be connected to VCC when not used.
UART Carrier-Detect (active low) or general purpose input. This
input should be connected to VCC when not used.
UART Ring-Indicator (active low) or general purpose input. This
input should be connected to VCC when not used.
Crystal or external clock input.
Crystal or buffered clock output.
Power-Save (active high). This feature isolates the M670’s data bus
interface from the host preventing other bus activities that cause
higher power drain during sleep mode. See Sleep Mode with Auto
Wake-up and Power-Save Feature section for details. This pin does
not have a pull-down resistor. This input should be connected to
GND when not used.
This input is active high. A 40 ns minimum active pulse on this pin
will reset the internal registers 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).
1.62V to 3.63V power supply.
Power supply common, ground.
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.
No Connects.
4
D
ESCRIPTION
REV. 1.0.0