參數(shù)資料
型號： XR19L222IL64-F
廠商： Exar Corporation
文件頁數(shù)： 45/53頁
文件大?。?/td> 0K
描述： IC UART/TXRX RS232 64QFN
標準包裝： 260
特點： *
通道數(shù)： 2，DUART
FIFO's： 64 字節(jié)
規(guī)程： RS232
電源電壓： 3.3 V ~ 5.5 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
帶CMOS： 是
安裝類型： 表面貼裝
封裝/外殼： 64-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 64-QFN（9x9）
包裝： 托盤
XR19L222
5
REV. 1.0.1
TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
ANCILLARY SIGNALS (CMOS/TTL Voltage Levels)
XTAL1
18
I
Crystal or external clock input. This input is not 5V tolerant.
XTAL2
19
O
Crystal or buffered clock output. This output may be use to drive a clock buffer which can
drive other device(s).
PwrSave
14
I
Power-Save (active high). This feature isolates the L222’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.
ACP
25
I
Autosleep for Charge Pump (active HIGH). When this pin is HIGH, the charge pump is shut
off if the L222 is already in partial sleep mode, i.e. the crystal oscillator is stopped.
I/M#
30
I
Intel or Motorola Bus Select.
When I/M# pin is HIGH, 16 or Intel Mode, the device will operate in the Intel bus type of
interface.
When I/M# pin is LOW, 68 or Motorola mode, the device will operate in the Motorola bus
type of interface.
RESET
(RESET#)
47
I
When I/M# pin is HIGH for Intel bus interface, this input becomes RESET (active high).
When I/M# pin is LOW for Motorola bus interface, this input becomes RESET# (active low).
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 HIGH, the receiver input will be ignored
and outputs are reset during reset period (see
C2+
C2-
46
45
-
Charge pump capacitors. As shown in
Figure 1, a 0.1 uF capacitor should be placed
between these 2 pins.
C1+
C1-
52
51
-
Charge pump capacitors. As shown in
Figure 1, a 0.1 uF capacitor should be placed
between these 2 pins.
VREF+
53
Pwr +5.0V generated by the charge pump.
VREF-
27
Pwr -5.0V generated by the charge pump.
R_EN
24
I
When the supply voltage is < 3.6V, connect R_EN to VCC.
When the supply voltage is > 3.6V, connect R_EN to GND.
C3A
C3B
55
56
I
When the supply voltage is 3.3 V, C3A and C3B should be connected to VCC.
When the supply voltage is 5 V, C3A should be connected to C3B with a 1 uF capacitor to
GND.
RXBSEL
8
I
When RXBSEL is HIGH, RXB is the input to the receiver of the UART.
When RXBSEL is LOW, RXDB is the input to the receiver of the UART.
FAST
21
I
When FAST is HIGH, the maximum serial data rate is 1 Mbps.
When FAST is LOW, the maximum serial data rate is 250 Kbps.
VCC
48, 54
Pwr 3.3V to 5.5V power supply. All CMOS/TTL input pins, except XTAL1, are 5V tolerant.
GND
2, 17, 22,
35
Pwr Power supply common, ground.
Pin Descriptions
NAME
64-QFN
PIN#
TYPE
DESCRIPTION
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