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DS89C21 Datasheet

  • DS89C21

  • Differential CMOS Line Driver and Receiver Pair

  • 6頁

  • NSC

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DS89C21 Differential CMOS Line Driver and Receiver Pair
June 1998
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.
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 鈥?15 mW typical
n
Guaranteed AC parameters:
鈥?Maximum driver skew 2.0 ns
鈥?Maximum receiver skew 4.0 ns
n
Extended temperature range: 鈭?0藲C to +85藲C
n
Available in SOIC packaging
n
Operates over 20 Mbps
n
Receiver OPEN input failsafe feature
Connection Diagram
Truth Tables
Driver
Input
DI
H
L
DS011753-1
Outputs
DO
H
L
DO
*
L
H
Order Number DS89C21TM
See NS Package Number M08A
Receiver
Inputs
RI鈥揜I
*
V
DIFF
鈮?/div>
+200 mV
V
DIFF
鈮?/div>
鈭?00 mV
OPEN
鈥?/div>
鈥?/div>
Non-terminated
Output
RO
H
L
H
漏 1998 National Semiconductor Corporation
DS011753
www.national.com

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