DS16F95A Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – TIA/EIA-485-A (RS-485) Extended Temperature Differential Bus Transceiver

November 11, 2008
DS16F95A
TIA/EIA-485-A (RS-485) Extended Temperature Differential
Bus Transceiver
General Description
The DS16F95A Differential Bus Transceiver is a monolithic
integrated circuit designed for bidirectional data communica-
tion on balanced multipoint bus transmission lines. The
transceiver conforms to both TIA/EIA-485-A and
TIA/EIA-422-B standards.
The DS16F95A offers improved performance due to the use
of L-FAST bipolar technology. The L-FAST technology allows
for higher speeds and lower currents by minimizing gate delay
times. The DS16F95A features an extended temperature
range and is offered in a rugged ceramic package.
The DS16F95A combines a TRI-STATE^® differential line driv-
er and a differential input line receiver, both of which operate
from a single 5.0V power supply. The driver and receiver have
an active Enable that can be externally connected to function
as a direction control. The driver differential outputs and the
receiver differential inputs are internally connected to form
differential input/output (I/O) bus ports that are designed to
offer minimum loading to the bus whenever the driver is dis-
abled or when V_CC = 0V. These ports feature wide positive
and negative common mode voltage ranges, making the de-
vice suitable for multipoint applications in noisy environments.
The driver is designed to accommodate loads of up to 60 mA
of sink or source current and features positive and negative
current limiting for protection from line fault conditions.
The device is offered in a rugged 8–lead Ceramic DIP pack-
age and is functional over the extended temperature range of
-55 °C to +180 °C.
Features
■ ^{Extended temperature range to +180 °C}
■ ^{Conforms to TIA/EIA-485-A}
■ ^{Designed for multipoint transmission}
■ ^{Wide positive and negative I/O bus voltage range}
■ ^{Driver positive and negative current-limiting}
■ ^{High impedance receiver input}
■ ^{Receiver input hysteresis of 50 mV typical}
■ ^{Operates from single 5.0V supply}
■ ^{Reduced power consumption}
■ ^{Pin compatible with DS16F95/DS3695 and SN75176A}
■ ^{Available in a 8-lead ceramic DIP package}
Logic Diagram
Function Tables
30066720
Driver Input
DI
H
L
X
Driver
Enable
DE
H
H
L
Outputs
A
B
H
L
L
H
Z
Z
Receiver
Differential Inputs
Enable
A–B
RE
V_ID ≥ 0.2V
L
V_ID ≤ −0.2V
L
0.2V > V_ID >-0.2V
L
X
H
H = High Level
L = Low Level
X = Immaterial
Z = High Impedance (Off)
Output
RO
H
L
X
Z
TRI-STATE^® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300667
www.national.com