1
August 2004
rev.1.2
Zywyn
Specifications subject to change without notice
Zywyn Corporation
ZT4xxE
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Email sales@zywyn.com • www.zywyn.com
General Description
The ZT485E series devices are 5V differential data line
transceivers for RS485/RS422 communication that consist
of one driver and one receiver with high level of ESD
protection. They are designed for balanced transmission
lines interface that meet ANSI standard TIA/EIA-485-A and
ISO 8482:1987(E) specifications.
The ZT485E series devices spans out with half or full duplex,
data rate guaranteed at 250k bit per second or 10Mbps, and
allow one unit load that fan out 32 devices sharing a common
bus. The I/Os are enhanced-electrostatic discharge (ESD)
protected, exceeding ±15kV Human Body Model (HBM).
Applications
• RS422/RS485 communications
• Utility meters
• Industrial process control
• Building automation
• Level tranlators
• Transceivers for EMI-sensitive applications
• Routers and HUBs
• Industrial-controlled Local Area Networks
• Industrial PCs, embedded PCs and peripherals
• Industrial, security CATV and camera applications
Features
• Meets or exceeds the requirements of ANSI Stan-
dard TIA/EIA-485-A and ISO 8482:1987(E) specifi-
cations for V
CC at +5V ±5%
• Low quiescent current – 0.5mA typ., 1mA max.
• Low shutdown current (where applicable) - 0.01µA
typical, 10µA max.
• Guaranteed standard data rate 250kbps or 10Mbps
• Thermal shutdown protection
• -7V to +12V common-mode input voltage range
• Half-Duplex or Full-Duplex configuration
• Allows up to 1 unit load (32 devices) on the same
common bus
• Controlled driver output slew rate and receiver input
filtering
• Active-high driver enable and active-low receiver
enable
• ESD Protection on bus terminals
±15kV Human Body Model (HBM)
• Drop-in Replacements for MAX483E, MAX485E,
MAX488E, MAX489E, MAX490E, MAX491E.
• High fanout driving 1/4 unit load (128 devices)
available on ZT485ER Series
Zywyn
ZT485E Low Power 5V 250kbps/10Mbps RS485 Transceivers
ZT483E, ZT485E, ZT488E
ZT489E, ZT490E, ZT491E
Low Power 5V 250kbps/10Mbps RS485 Transceivers
Part
Number Duplex
# 0f
Tx/Rx
Data
Rate
(Mbps)
# of
Tx/Rx
on Bus
Slew
Rate
Limit
Rx
Input
Filtering
Low-
Power
Shutdown
Tx/Rx
Enable
ESD
on
Tx/Rx
Number
of Pins
Pin-to-Pin
Cross
Reference
ZT483E
Half
1/1
0.25
32
Yes
Yes
Yes
Yes
± 15kV
8
MAX483E
ZT485E
Half
1/1
10
32
No
No
Yes
Yes
± 15kV
8
MAX485E
ZT488E
Full
1/1
0.25
32
Yes
Yes
No
No
± 15kV
8
MAX488E
ZT489E
Full
1/1
0.25
32
Yes
Yes
Yes
Yes
± 15kV
14
MAX489E
ZT490E
Full
1/1
10
32
No
No
No
No
± 15kV
8
MAX490E
ZT491E
Full
1/1
10
32
No
No
Yes
Yes
± 15kV
14
MAX491E
Product Selection GuideAnd Cross Reference
ZT483E/ZT485E
NowAvailable in Green Package Option
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