DS89C21TMX National Semiconductor, DS89C21TMX Datasheet

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DS89C21TMX

Manufacturer Part Number
DS89C21TMX
Description
IC,LINE TRANSCEIVER,CMOS,1 DRIVER,1 RCVR,SOP,8PIN,PLASTIC
Manufacturer
National Semiconductor
Datasheet

Specifications of DS89C21TMX

Rohs Compliant
NO

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© 2004 National Semiconductor Corporation
DS89C21
Differential CMOS Line Driver and Receiver Pair
General Description
The DS89C21 is a differential CMOS line driver and receiver
pair, designed to meet the requirements of TIA/EIA-422-A
(RS-422) electrical characteristics interface standard. The
DS89C21 provides one driver and one receiver in a mini-
mum footprint. The device is offered in an 8-pin SOIC pack-
age.
The CMOS design minimizes the supply current to 6 mA,
making the device ideal for use in battery powered or power
conscious applications.
The driver features a fast transition time specified at 2.2 ns,
and a maximum differential skew of 2 ns making the driver
ideal for use in high speed applications operating above
10 MHz.
The receiver can detect signals as low as 200 mV, and also
incorporates hysteresis for noise rejection. Skew is specified
at 4 ns maximum.
Connection Diagram
Truth Tables
Non-terminated
DS011753
Input
V
V
DI
H
DIFF
DIFF
L
See NS Package Number M08A
OPEN
Inputs
RI–RI*
≥ +200 mV
≤ −200 mV
Order Number DS89C21TM
Receiver
Driver
DO
H
L
The DS89C21 is compatible with TTL and CMOS levels (DI
and RO).
Features
n Meets TIA/EIA-422-A (RS-422) and CCITT V.11
n LOW POWER design — 15 mW typical
n Guaranteed AC parameters:
n Extended temperature range: −40˚C to +85˚C
n Available in SOIC packaging
n Operates over 20 Mbps
n Receiver OPEN input failsafe feature
recommendation
— Maximum driver skew 2.0 ns
— Maximum receiver skew 4.0 ns
Outputs
01175301
Output
RO
H
H
L
DO*
H
L
www.national.com
June 1998

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DS89C21TMX Summary of contents

Page 1

... Skew is specified maximum. Connection Diagram Truth Tables † Non-terminated © 2004 National Semiconductor Corporation The DS89C21 is compatible with TTL and CMOS levels (DI and RO). Features n Meets TIA/EIA-422-A (RS-422) and CCITT V.11 recommendation n LOW POWER design — typical n Guaranteed AC parameters: — ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Driver Input Voltage (DI) −1. Driver Output Voltage (DO Receiver Input Voltage — (RI Differential Receiver Input * Voltage — V (RI DIFF Receiver Output Voltage (RO) − ...

Page 3

Electrical Characteristics Over recommended supply voltage and operating temperature ranges, unless otherwise specified. Symbol Parameter RECEIVER CHARACTERISTICS V Output HIGH Voltage OH V Output LOW Voltage OL I Output Short Circuit Current OSR DRIVER AND RECEIVER CHARACTERISTICS I Supply Current ...

Page 4

Parameter Measurement Information FIGURE 3. Driver Differential Propagation Delay Timing www.national.com (Continued) FIGURE 2. Driver Propagation Delay Test Circuit FIGURE 4. Driver Differential Transition Timing FIGURE 5. Receiver Propagation Delay Test Circuit 4 01175303 01175304 01175305 01175306 ...

Page 5

Parameter Measurement Information FIGURE 6. Receiver Propagation Delay Timing (Continued) FIGURE 7. Receiver Rise and Fall Times 5 01175307 01175308 www.national.com ...

Page 6

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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