NOTE
參數(shù)資料
型號： XR16V794IV-F
廠商： Exar Corporation
文件頁數(shù)： 45/53頁
文件大?。?/td> 0K
描述： IC UART FIFO 64B QUAD 64LQFP
標(biāo)準(zhǔn)包裝： 160
特點(diǎn)： *
通道數(shù)： 4，QUART
FIFO's： 64 字節(jié)
規(guī)程： RS485
電源電壓： 2.25 V ~ 3.6 V
帶自動流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動位檢測功能： 是
帶調(diào)制解調(diào)器控制功能： 是
安裝類型： 表面貼裝
封裝/外殼： 64-LQFP
供應(yīng)商設(shè)備封裝： 64-LQFP（10x10）
包裝： 托盤
XR16V794
5
REV. 1.0.1
HIGH PERFORMANCE 2.25V TO 3.6V QUAD UART WITH FRACTIONAL BAUD RATE
NOTE: Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
TX3
28
O
UART channel 3 Transmit Data or infrared transmit data. Normal TXD output idles
HIGH while infrared TXD output idles LOW.
RX3
21
I
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.
RTS3#
26
O
UART channel 3 Request to Send or general purpose output (active low). See
description of RTS0# pin.
CTS3#
22
I
UART channel 3 Clear to Send or general purpose input (active low).d. See
description of CTS0# pin.
DTR3#
27
O
UART channel 3 Data Terminal Ready or general purpose output (active low). See
description of DTS0# pin.
DSR3#
23
I
UART channel 3 Data Set Ready or general purpose input (active low). See
description of DSR0# pin.
CD3#
24
I
UART channel 3 Carrier Detect or general purpose input (active low).
RI3#
25
I
UART channel 3 Ring Indicator or general purpose input (active low).
ANCILLARY SIGNALS
XTAL1
50
I
Crystal or external clock input. Caution: this input is not 5V tolerant.
XTAL2
49
O
Crystal or buffered clock output.
TMRCK
31
I
16-bit timer/counter external clock input.
ENIR
32
I
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.
RST#
20
I
Reset (active low). The configuration and UART registers are reset to default val-
ues, see
16/68#
19
I
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.
VCC
9,30,52
+2.25V to 3.6V supply with 5V tolerant serial (modem) inputs.
GND
10,29,51
Power supply common, ground.
NAME
PIN #TYPE
DESCRIPTION
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