xr16l784iv Exar Corporation, xr16l784iv Datasheet - Page 5

• Manufacturer Part Number: xr16l784iv
• Description: High Performance 2.97v To 5.5v Quad Uart
• Manufacturer: Exar Corporation

xr
REV. 1.2.2
Pin Descriptions
N
ANCILLARY SIGNALS
OTE
TMRCK
DTR3#
DSR3#
RTS3#
CTS3#
16/68#
: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
XTAL1
XTAL2
N
CD3#
RST#
ENIR
GND
RI3#
VCC
RX3
TX3
AME
10,29,51
9,30,52
P
28
21
26
22
27
23
24
25
50
49
31
32
20
19
IN
#
T
YPE
O
O
O
O
I
I
I
I
I
I
I
I
I
I
UART channel 3 Transmit Data or infrared transmit data. Normal TXD output
idles HIGH while infrared TXD output idles LOW.
UART channel 3 Receive Data or infrared receive data. Normal RXD input
idles HIGH while infrared RXD input idles LOW. In the infrared mode, the
polarity of the incoming RXD signal can be selected via FCTR bit-4. If this bit
is a logic 0, a LOW on the RXD input is considered a mark and if this bit is a
logic 1, a HIGH on the RXD input is considered a space.
UART channel 3 Request to Send or general purpose output (active low).
See description of RTS0# pin.
UART channel 3 Clear to Send or general purpose input (active low).d. See
description of CTS0# pin.
UART channel 3 Data Terminal Ready or general purpose output (active low).
See description of DTS0# pin.
UART channel 3 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
UART channel 3 Carrier Detect or general purpose input (active low).
UART channel 3 Ring Indicator or general purpose input (active low).
Crystal or external clock input. Caution: this input is not 5V tolerant.
Crystal or buffered clock output.
16-bit timer/counter external clock input.
Infrared mode enable (active high). This pin is sampled during power up, fol-
lowing a hardware reset (RST#) or soft-reset (register RESET). It can be
used to start up all 8 UARTs in the infrared mode. The sampled logic state is
transferred to MCR bit-6 in the UART.
Reset (active low). The configuration and UART registers are reset to default
values, see Table-15.
Intel or Motorola data bus interface select. HIGH selects Intel bus interface
and LOW selects Motorola interface. This input affects the functionality of
IOR#, IOW# and CS# pins.
+5V or +3.3V supply, all inputs are 5V tolerant except for XTAL1.
Power supply common, ground.
5
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
D
ESCRIPTION
XR16L784