xr16v794iv Exar Corporation, xr16v794iv Datasheet - Page 5

• Manufacturer Part Number: xr16v794iv
• Description: High Performance 2.25v To 3.6v Quad Uart With Fractional
• Manufacturer: Exar Corporation

REV. 1.0.0
N
ANCILLARY SIGNALS
OTE
TMRCK
DTR3#
DSR3#
RTS3#
CTS3#
16/68#
XTAL1
XTAL2
N
CD3#
RST#
ENIR
GND
RI3#
VCC
RX3
TX3
AME
: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
10,29,51
9,30,52
P
28
21
26
22
27
23
24
25
50
49
31
32
20
19
IN
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
#
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, following
a hardware reset (RST#) or soft-reset (register RESET). It can be used to start up
all 4 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 val-
ues, see
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.
+2.25V to 3.6V supply with 5V tolerant serial (modem) inputs.
Power supply common, ground.
Table 19
.
5
D
ESCRIPTION
XR16V794