XR3177EID 반도체 회로 부품 판매점
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS
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 Exar |
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
DECEMBER 2009
REV. 1.0.0
GENERAL DESCRIPTION
FEATURES
The XR3170E - XR3178E family of RS-485 devices
are designed for reliable, bidirectional communication
on multipoint bus transmission lines. Each device
contains one differential driver and one differential
receiver. XR3172E, XR3175E and XR3178E are half-
duplex devices; other part numbers are full-duplex.
All devices comply with TIA/EIA-485 and TIA/EIA-422
standards. Lead free and RoHS compliant packages
are available for all models.
These devices are ruggedized for use in harsh
operating conditions over the entire common-mode
voltage range from -7V to +12V. Receivers are
specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-
485 bus pins are protected against severe ESD
events up to +/-15kV (Air-Gap and Human Body
Model) and up to +/-8kV Contact Discharge (IEC
61000-4-2). Drivers are protected from excess
current flow caused by bus contention or output
short-circuits by both an internal current limit and a
thermal-overload shutdown. Devices are rated for
Industrial (-40 to +85°C) operating temperatures.
Receivers have exceptionally high input impedance,
which places only 1/8th the standard load on a shared
bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 3.3V power supply
and draw negligible quiescent power. All versions
except the XR3171E, XR3174E and XR3177E may
independently enable and disable their driver and
receiver and enter a low power shutdown mode if
both driver and receiver are disabled. All outputs
maintain high impedance in shutdown or when
powered off.
• 3.3V Single Supply Operation
• High Speed 20Mbps Data Rate
• Slew Rate Limited - 250kbps And 500kbps Data
Rate
• 1/8th Unit Load, 256 Transceivers On Bus
• Enhanced Failsafe For Receiver - Open, Short Or
Terminated Lines
• Robust ESD Protection For RS-485 Pins
■ +/-15kV Air-Gap Discharge
■ +/-15kV Human Body Model
■ +/-8kV Contact Discharge
• Hot Swap Glitch Protection
• Driver Short Circuit Current Limit And Thermal
Shutdown For Overload Protection
• Ultra-Low 650uA Quiescent Current
• 1µA Shutdown Mode
• Industry Standard Package Footprints
TYPICAL APPLICATIONS
• Motor Control
• Building Automation
• Security Systems
• Remote Utility Meter Reading
• Long Or Un-Terminated Transmission Lines
FIGURE 1. TYPICAL APPLICATION CIRCUIT
DE
XR3178E
B
DI RT
A
RO
B
STUB
A
DE
XR3178E
B
RT
A
BA
DI
RO
RE
DE
RE DE
RE
RE
DI RO
DI RO
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
XR3170E-3178E
3.3V HIGH SPEED RS-485/RS-422 TRANSCEIVERS WITH 1/8th UNIT LOAD
FIGURE 2. PIN OUT ASSIGNMENT
RO 1
RE 2
DE 3
DI 4
8-Pin NSOIC
Half Duplex
XR3172E
XR3175E
XR3178E
8 VCC
7B
6A
5 GND
REV. 1.0.0
VCC 1
RO 2
DI 3
GND 4
8-Pin NSOIC
Full Duplex
XR3171E
XR3174E
XR3177E
8A
7B
6Z
5Y
NC 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
14-Pin NSOIC
Full Duplex
XR3170E
XR3173E
XR3176E
14 VCC
13 NC
12 A
11 B
10 Z
9Y
8 NC
ORDERING INFORMATION
PART NUMBER
XR3170EID
XR3171EID
XR3172EID
XR3173EID
XR3174EID
XR3175EID
XR3176EID
XR3177EID
XR3178EID
PACKAGE
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
14-pin Narrow SOIC
8-pin Narrow SOIC
8-pin Narrow SOIC
OPERATING TEMPERATURE
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Note: Please visit www.exar.com for tape and reel option part numbers.
DEVICE STATUS
Active
Active
Active
Active
Active
Active
Active
Active
Active
2
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XR3177EID transceiver
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