ZT3485E Low Power 3V 250kbps/16Mbps RS485 Transceivers
Zywyn Corporation
ZT3485E
Zywyn
ZT3483E, ZT3485E ZT3488E, ZT3490E, ZT3491E
Low Power 3V 250kbps/16Mbps RS485E Transceivers
Features
• Meets or exceeds the requirements of ANSI Standard TIA/EIA-485-A and ISO 8482:1987(E) specifications for VCC at +3.3V ±10%
• Low quiescent current – 0.5mA typ., 1.5mA max. • Low shutdown current (where applicable) - 0.05μA
typical, 10μA max. • Guaranteed standard data rate 250kbps or 16Mbps • True Fail-Safe (Open and Short) Receiver • -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 MAX3483E, MAX3485E,
MAX3488E, MAX3490E, MAX3491E • High fanout driving 1/8 unit load (256 devices)
available on ZT3070E Series
General Description
The ZT3485E series devices are 3V 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 ZT3485E series devices span out with half or full duplex, data rate guaranteed at 250kbps or 16Mbps, 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
• RS-422/RS-485 communications • Utility meters • Industrial process control • Building automation • Level translators • Transceivers for EMI-sensitive applications • Routers and HUBs • Industrial-controlled Local Area Networks • Industrial PCs, embedded PCs and peripherals
ZT348xE
ZT3491E
Product Selection Guide And Cross Reference
Part Num ber
ZT3483E ZT3485E ZT3488E ZT3490E ZT3491E
Duplex
Half Half Full Full Full
# 0f Tx/ Rx
1/ 1 1/ 1 1/ 1 1/ 1 1/ 1
Data
Ra t e
( Mbps) 0.25 16 0.25 16 16
# of Tx/
Rx on
Bu s 32 32 32 32 32
Slew
Ra t e
Lim it Yes No Yes No No
Rx I nput Filt e r in g
Low Pow er Shutdow n
Tx/ Rx En a b l e
Yes Yes Yes
No Yes Yes
Yes No No
No No No
No Yes Yes
ESD on Tx/ Rx
± 15kV ± 15kV ± 15kV ± 15kV ± 15kV
Num ber of Pins
8 8 8 8 14
Pin - t o-
Pin Cr oss
Re f e r e n ce MAX3 4 8 3 E MAX3 4 8 5 E MAX3 4 8 8 E MAX3 4 9 0 E MAX3 4 9 1 E
Zywyn
Specifications subject to change without notice
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Ema1il
[email protected] • www.zywyn.com
June 2012
rev. 1.5
Zywyn Corporation
ZT3485E
Absolute Maximum Ratings
Storage Considerations
These are stress ratings only and functional operation of Storage in a low humidity environment is preferred.
the device at these ratings or any other above those indi- Large high density plastic packages are moisture sen-
cated in the operation sections of the specifications is not sitive and should be stored in Dry Vapor Barrier Bags.
implied. Exposure to absolute maximum rating conditions Prior to usage, the parts should remain bagged and
for extended periods of time may affect reliability.
stored below 40°C and 60%RH. If the parts are re-
Power Supply, (VCC).................................... –0.3V to +7.0V Input Voltages
DI, DE, RE ........................................ –0.3V to (VCC +0.3V) Differential Input Voltage, (VID) ..................... -12V to +12V A, B (VI) ......................................................... -9V to +13V Output Voltages
RO ............................................................... –0.3V to +6.0V
Y, Z (A & B on Half Duplex) ...........................-9V to +13.0V
Operating Temperature...............................–40°C to +85°C
moved from the bag, they should be used within 168 hours or stored in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked for 12 hours at 125°C in order to remove moisture prior to soldering. Zywyn ships product in Dry Vapor Barrier Bags with a humidity indicator card and desiccant pack. The humidity indicator should be below 30%RH. The MSL of this product is 3. The information furnished by Zywyn has been carefully reviewed for accuracy and reliability. Its application or
Storage Temperature................................–65°C to +150°C use, however, is solely the responsibility of the user. No
responsibility of the use of this information become part
Power Dissipation Per Package 8-pin PDIP (derate 9.09mW/°C above +70°C) ........ 722mW 8-pin nSOIC (derate 6.14mW/°C above +70°C) ....... 500mW 14-pin PDIP (derate 10.00mW/°C above +70°C) ...... 800mW 14-pin nSOIC (derate 8.33mW/°C above +70°C) .... 667mW
of the terms and conditions of any subsequent.