參數(shù)資料
型號(hào): XR16L2552IJTR-F
廠商: Exar Corporation
文件頁數(shù): 3/45頁
文件大?。?/td> 0K
描述: IC UART FIFO 16B DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 500
特點(diǎn): *
通道數(shù): 2,DUART
FIFO's: 16 字節(jié)
規(guī)程: RS232
電源電壓: 2.25 V ~ 5.5 V
帶自動(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動(dòng)位檢測(cè)功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 帶卷 (TR)
XR16L2552
11
REV. 1.1.2
2.25V TO 5.5V DUART WITH 16-BYTE FIFO
To obtain maximum data rate, it is necessary to use full rail swing on the clock input. See external clock
operating frequency over power supply voltage chart in Figure 6.
The L2552 divides the basic external clock by 16. The basic 16X clock provides table rates to support standard
and custom applications using the same system design. The Baud Rate Generator divides this 16X clock by
any divisor from 1 to 216 -1. The rate table is configured via the DLL and DLM internal register functions.
Customized Baud Rates can be achieved by selecting the proper divisor values for the MSB and LSB sections
of baud rate generator.
Table 5 shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X sampling
rate. When using a non-standard frequency crystal or external clock, the divisor value can be calculated for
DLL/DLM with the following equation.
FIGURE 6. OPERATING FREQUENCY CHART. REQUIRES A 2K OHMS PULL-UP RESIS-
TOR ON
XTAL2 PIN TO INCREASE OPERATING SPEED
divisor (decimal) = (XTAL1 or External clock frequency ) / (serial data rate x 16)
TABLE 5: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK
OUTPUT Data Rate
MCR Bit-7=0
DIVISOR FOR 16x
Clock (Decimal)
DIVISOR FOR 16x
Clock (HEX)
DLM PROGRAM
VALUE (HEX)
DLL PROGRAM
VALUE (HEX)
DATA RATE
ERROR (%)
400
2304
900
09
00
0
2400
384
180
01
80
0
4800
192
C0
00
C0
0
9600
96
60
00
60
0
19.2k
48
30
00
30
0
38.4k
24
18
00
18
0
76.8k
12
0C
00
0C
0
60
50
40
30
3.0
4.5
5.5
3.5 4.0
5.0
Suppy Voltage
XT
A
L1
E
x
te
rn
al
Cloc
k
F
reque
ncy
in
MHz
.
70
80
85oC
25oC
-40oC
Operating frequency for XR16L2552
with external clock and a 2K ohms
pull-up resistor on XTAL2 pin.
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