Zywyn Corporation
ZT4xxER
Zywyn
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 1/4 unit load (128 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 MAX487E, MAX3291,
MAX3292, SN75LBC182, SN65LBC182
• Standard fanout driving 1 unit load (32 devices)
available on the ZT485E Series
ZT487E, ZT485ER, ZT488ER
ZT489ER, ZT490ER, ZT491ER
Low Power 5V 250kbps/10Mbps 128-Fanout RS485 Transceivers
General Description
The ZT485ER 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 ZT485ER series devices spans out with half or full
duplex, data rate guaranteed at 250k bit per second or
10Mbps, and allow one-fourth of an unit load that fan out 128
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
ZT487E/ZT485ER
Product Selection Guide And Cross Reference
Part
Number
ZT485ER
ZT487E
ZT488ER
ZT489ER
ZT490ER
ZT491ER
# 0f
Duplex
Tx/Rx
Half
Half
Full
Full
Full
Full
1/1
1/1
1/1
1/1
1/1
1/1
Data
# of
Rate
Tx/Rx
(Mbps) on Bus
10
0.25
0.25
0.25
10
10
128
128
128
128
128
128
Slew
Rate
Limit
No
Yes
Yes
Yes
No
No
Now Available in Green Package Option
ESD
on
Tx/Rx
± 15kV
± 15kV
± 15kV
± 15kV
± 15kV
± 15kV
Number
of Pins
8
8
8
14
8
14
Pin-to-Pin
Cross
Reference
Rx
Low-
Tx/Rx
Input
Power
Enable
Filtering Shutdown
No
Yes
Yes
Yes
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
No
Yes
n/a
SN75LBC182
MAX487E
n/a
n/a
n/a
MAX3291/92
Zywyn
1
Specifications subject to change without notice
Febuary 2005
rev.1.2
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Email sales@zywyn.com • www.zywyn.com
ASIX [ ASIX ELECTRONICS CORPORATION ]
