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ADM238LJR 参数 Datasheet PDF下载

ADM238LJR图片预览
型号: ADM238LJR
PDF下载: 下载PDF文件 查看货源
内容描述: + 5V供电的CMOS RS - 232驱动器/接收器 [+5 V Powered CMOS RS-232 Drivers/Receivers]
分类和应用: 驱动器
文件页数/大小: 16 页 / 367 K
品牌: AD [ ANALOG DEVICES ]
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a
FEATURES
Single 5 V Power Supply
Meets All EIA-232-E and V.28 Specifications
120 kB/s Data Rate
On-Board DC-DC Converters
9 V Output Swing with +5 V Supply
Small 1 F Capacitors
Low Power Shutdown
≤1
A
Receivers Active in Shutdown (ADM223)
ESD > 2 kV
30 V Receiver Input Levels
Latch-Up FREE
Plug-In Upgrade for MAX223/230-241
Plug-In Upgrade for AD230–AD241
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
GENERAL DESCRIPTION
+5 V Powered
CMOS RS-232 Drivers/Receivers
ADM223/ADM230L–ADM241L
ADM232L TYPICAL OPERATING CIRCUIT
+5V INPUT
1 C1+
3 C1–
+5V TO +10V
VOLTAGE
DOUBLER
VCC 16
V+ 2
V– 6
1µF
6.3V
1µF
16V
1µF
6.3V
1µF
6.3V
4 C2+ +10V TO –10V
VOLTAGE
INVERTER
5 C2–
11
10
12
9
GND
15
T1
T2
R1
R2
1µF
16V
T1OUT
T2OUT
R1IN
R2IN
TTL/CMOS
INPUTS*
T1IN
T2IN
14
7
13
8
RS-232
OUTPUTS
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
RS-232
INPUTS**
ADM232L
*INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT
**INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
The ADM2xx family of line drivers/receivers is intended for all
EIA-232-E and V.28 communications interfaces, especially in
applications where
±
12 V is not available. The ADM223,
ADM230L, ADM235L, ADM236L and ADM241L feature a
low power shutdown mode that reduces power dissipation to
less than 5
µW,
making them ideally suited for battery powered
equipment. Two receivers remain enabled during shutdown on
the ADM223. The ADM233L and ADM235L do not require
any external components and are particularly useful in applica-
tions where printed circuit board space is critical.
All members of the ADM230L family, except the ADM231L
and the ADM239L, include two internal charge pump voltage
converters that allow operation from a single +5 V supply.
These converters convert the +5 V input power to the
±
10 V
required for RS-232 output levels. The ADM231L and
ADM239L are designed to operate from +5 V and +12 V sup-
plies. An internal +12 V to –12 V charge pump voltage con-
verter generates the –12 V supply.
The ADM2xxL is an enhanced upgrade for the AD2xx family
featuring lower power consumption, faster slew rate and opera-
tion with smaller (1
µF)
capacitors.
Table I. Selection Table
Part
Number
ADM223
ADM230L
ADM231L
ADM232L
ADM233L
ADM234L
ADM235L
ADM236L
ADM237L
ADM238L
ADM239L
ADM241L
REV. 0
Power
Supply Voltage
+5 V
+5 V
+5 V & +7.5 V to +13.2 V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V
+5 V & +7.5 V to +13.2 V
+5 V
No. of
RS-232
Drivers
4
5
2
2
2
4
5
4
5
4
3
4
No. of
RS-232
Receivers
5
0
2
2
2
0
5
3
3
4
5
5
External
Capacitors
4
4
2
4
None
4
None
4
4
4
2
4
Low Power
Shutdown
(SD)
Yes (SD)
Yes
No
No
No
No
Yes
Yes
No
No
No
Yes
TTL
Three-State
EN
Yes (EN)
No
No
No
No
No
Yes
Yes
No
No
Yes
Yes
No. of
Pins
28
20
14
16
20
16
24
24
24
24
24
28
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997