參數(shù)資料
型號(hào)： XR16L651IM-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 53/56頁(yè)
文件大小： 0K
描述： IC UART FIFO 32B 48TQFP
標(biāo)準(zhǔn)包裝： 250
特點(diǎn)： *
通道數(shù)： 1，UART
FIFO's： 32 字節(jié)
規(guī)程： 打印機(jī)，RS232，RS422，RS485
電源電壓： 2.25 V ~ 5.5 V
帶并行端口： 是
帶自動(dòng)流量控制功能： 是
帶IrDA 編碼器/解碼器： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶調(diào)制解調(diào)器控制功能： 是
帶CMOS： 是
安裝類(lèi)型： 表面貼裝
封裝/外殼： 48-TQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（7x7）
包裝： 托盤(pán)
XR16L651
á
2.25V TO 5.5V UART WITH 32-BYTE FIFO
REV. 1.3.0
6
Pin type: I=Input, O=Output, IO= Input/output, OD=Output Open Drain.
XTAL1
14
I
Crystal or external clock input. Caution: this input is not 5V tolerant.
XTAL2
15
O
Crystal or buffered clock output
RCLK
5
I
Receiver Clock
This input is used as external 16X clock input to the receiver section. Connect
the BAUDOUT# pin to this input externally.
BAUDOUT#
12
O
Baud Rate Generator Output (active low)
This pin provides the 16X clock of the selected data rate from the baud rate
generator. The RCLK pin must be connected externally to BAUDOUT# when
the receiver is operating at the same data rate.
When the PC mode is selected, the baud rate generator clock output is inter-
nally connected to the RCLK input. This pin then functions as the LPT-1
printer port decode logic output, see
PCMODE#
36
I
PC Mode Select (active low)
When this input is at logic 0, it enables the on-board chip select decode func-
tion according to PC ISA bus COM[4:1] and IRQ[4:3] port definitions. See
Table 3 for details. This pin has an internal 100k
pull-up resistor.
DDIS#
22
O
Drive Disable Output
This pin goes to a logic 0 whenever the host CPU is reading data from the
651. It can control the direction of a data bus transceiver between the CPU
and 651 or other logic functions.
ENIR
13
I
Enable Infrared Mode (active high)
This pin can be used to start up the UART in wireless infrared mode. This
input is sampled when the reset input signal (RESET or RESET#) is de-
asserted. The TX output would idle at logic 0 instead of normal logic 1. The
software infrared enable bit (MCR bit-6) will have full enable/disable control
after the power up.
RESET
(RESET#)
35
I
Reset Input
A 40 ns minimum active pulse on this pin will reset the internal registers and
all outputs. The UART transmitter output will be held at logic 1 (if ENIR pin is
at a logic 0), the receiver input will be ignored and outputs are reset. See
UART Reset Conditions in
Table 13. When IM# pin is at a logic 0, Intel bus
mode, reset input is active high. When IM# pin is at a logic 1, Motorola bus
mode, reset input is active low.
IM#
37
I
Intel or Motorola data bus interface select
A logic 0 selects Intel bus interface and a logic 1 selects Motorola interface.
This input affects the functionality of IOR#, IOW#, CS# and INT pins.
OP1#
34
O
Output Port 1
General purpose output.
OP2#
31
O
Output Port 2
General purpose output.
VCC
43
Pwr
2.25V to 5.5V supply voltage
All inputs, except XTAL1, are 5V tolerant.
GND
18
Pwr
Power supply common ground.
NC
1,25
-
No Connect
NAME
PIN #TYPE
DESCRIPTION
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