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| 型号： | ADM3493ARZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 通用总线功能 |
| 英文描述： | 3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封装： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件页数： | 1/12页 |
| 文件大小： | 233K |
| 代理商： | ADM3493ARZ-REEL7 |
3.3 V Slew Rate Limited,
Half Duplex RS-485/RS-422 Transceiver
ADM3493
FEATURES
Operates with 3.3 V supply
Interoperable with 5 V logic
EIA RS-422 and RS-485 compliant over full CM range
Data rate: 250 kbps
Half duplex transceiver
Reduced slew rates for low EMI
2 nA supply current in shutdown mode
Up to 256 transceivers on a bus
7 V to +12 V bus common-mode range
Specified over 40°C to +85°C temperature range
8 ns skew
Available in 8-lead SOIC
Rev. 0
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2005 Analog Devices, Inc. All rights reserved.
www.analog.com
APPLICATIONS
Low power RS-485 applications
EMI sensitive systems
DTE-DCE interfaces
Industrial control
Packet switching
Local area networks
Level translators
FUNCTIONAL BLOCK DIAGRAM
R
D
RO
V
CC
RE
DI
DE
ADM3493
A
GND
B
0
Figure 1.
GENERAL DESCRIPTION
The ADM3493 is a low power, differential line transceiver
designed to operate using a single 3.3 V power supply. Low
power consumption, coupled with a shutdown mode, makes it
ideal for power-sensitive applications. The ADM3493 is suitable
for communication on multipoint bus transmission lines.
The device contains one driver and one receiver. Designed for
half-duplex communication, the ADM3493 features a slew rate
limited driver that minimizes EMI and reduces reflections
caused by improperly terminated cables, allowing error-free
data transmission at data rates up to 250 kbps.
The receiver input impedance is 96 kΩ, allowing up to 256
transceivers to be connected on the bus. A thermal shutdown
circuit prevents excessive power dissipation caused by bus
contention or by output shorting. If a significant temperature
increase is detected in the internal driver circuitry during fault
conditions then the thermal shutdown circuit forces the driver
output into a high impedance state. The receiver contains a fail-
safe feature that results in a logic high output state, if the inputs
are unconnected (floating).
The ADM3493 is fully specified over the commercial and
industrial temperature ranges and is available in an 8-lead SOIC.
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