參數(shù)資料
型號: XR16L2551
廠商: Exar Corporation
英文描述: LOW VOLTAGE DUART WITH POWERSAVE
中文描述: 低壓杜阿爾特與省電
文件頁數(shù): 11/48頁
文件大?。?/td> 287K
代理商: XR16L2551
á
REV. 1.0.0
XR16L2551
LOW VOLTAGE DUART WITH POWERSAVE
11
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100 ppm frequency
tolerance) connected externally between the XTAL1 and XTAL2 pins (see
Figure 4
), with an external 500 k
to
1 M
resistor across it. Alternatively, an external clock can be connected to the XTAL1 pin to clock the internal
baud rate generator for standard or custom rates. Typical oscillator connections are shown in
Figure 4
. For
further reading on oscillator circuit please see application note DAN108 on EXAR’s web site.
2.8
Programmable Baud Rate Generator
A single baud rate generator is provided for the transmitter and receiver, allowing independent TX/RX channel
control. The programmable Baud Rate Generator is capable of operating with a crystal frequency of up to 24
MHz. However, with an external clock input on XTAL1 pin and a 2K ohms pull-up resistor on XTAL2 pin (as
shown in
Figure 5
) it can extend its operation up to 64 MHz (4Mbps serial data rate) at room temperature and
5.0V.
F
IGURE
4. T
YPICAL
OSCILLATOR
CONNECTIONS
F
IGURE
5. E
XTERNAL
C
LOCK
C
ONNECTION
FOR
E
XTENDED
D
ATA
R
ATE
C1
22-47 pF
C2
22-47 pF
Y1
1.8432 MHz
to
24 MHz
R1
0-120
(Optional)
R2
500 K
- 1 M
XTAL1
XTAL2
2K
XTAL1
XTAL2
R1
VCC
External Clock
vcc
gnd
相關(guān)PDF資料
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XR16L2551IL LOW VOLTAGE DUART WITH POWERSAVE
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相關(guān)代理商/技術(shù)參數(shù)
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