RS-485/RS-422 TRANSCEIVER. ST3485E Datasheet

ST3485E TRANSCEIVER. Datasheet pdf. Equivalent


STMicroelectronics ST3485E
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ST3485E
3.3V Powered, 15KV ESD protected,
Up to 12Mbps RS-485/RS-422 transceiver
General features
s ESD protection
– ±15kV human body model
– ±8kV IEC 1000-4-2 contact discharge
s Operate from a single 3.3V supply - no charge
pump required
s Interoperable with 5V logic
s 1µA low current shutdown mode max
s Guaranteed 12Mbps data rate
s -7 to 12 common mode input voltage range
s Half duplex versions available
s Industry standard 75176 pinout
s Current limiting and thermal shutdown for
driver overload protection
s Guaranteed high receiver output state for
floating inputs with no signal present
s Allow up to 64 transceivers on the bus
Description
The ST3485E is ±15kV ESD protected, 3.3V low
power transceiver for RS-485 and RS-422
communications. The device contains one driver
DIP-8
SO-8
and one receiver in half duplex configuration. The
ST3485E transmits and receives at a guaranteed
data rate of at least 12Mbps.
All transmitter outputs and receiver inputs are
protected to ±15kV using Human Body Model.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that places the driver
outputs into a high-impedance state.
Order code
Part number
ST3485ECN
ST3485EBN
ST3485ECDR
ST3485EBDR
Temperature range
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
April 2006
Package
DIP-8
DIP-8
SO-8 (Tape & Reel)
SO-8 (Tape & Reel)
Rev 2
Comments
50parts per tube / 40tube per box
50parts per tube / 40tube per box
2500 parts per reel
2500 parts per reel
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ST3485E Datasheet
Recommendation ST3485E Datasheet
Part ST3485E
Description TRASMIT AT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER
Feature ST3485E; www.DataSheet4U.com ST3485E 3.3V Powered, 15KV ESD protected, Up to 12Mbps RS-485/RS-422 transceive.
Manufacture STMicroelectronics
Datasheet
Download ST3485E Datasheet




STMicroelectronics ST3485E
Contents
Contents
ST3485E
1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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STMicroelectronics ST3485E
ST3485E
1 Pin configuration
Figure 1. Pin connections
Pin configuration
Table 1.
Pin n°
1
2
3
4
5
6
7
8
Pin description
Symbol
Name and function
RO Receiver output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be low
RE
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE
is high. If RE is high and DE is low, the device will enter a low power shutdown mode.
Driver output enable. The driver outputs are enabled by bringing DE high. They are high
DE
impedance when DE is low. If RE is high DE is low, the device will enter a low-power
shutdown mode. If the driver outputs are enabled, the part functions as line driver, while
they are high impedance, it functions as line receivers if RE is low.
DI
GND
Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI
forces output A high and output B low
Ground
A Non-inverting receiver input and non-inverting driver output
B Inverting receiver input and inverting driver output
VCC Supply voltage: VCC= 3V to 3.6V
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