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PDF DS8838 Data sheet ( Hoja de datos )
| Número de pieza | DS8838 | |
| Descripción | Quad Unified Bus Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1999
DS8838
Quad Unified Bus Transceiver
General Description
The DS8838 is a quad high speed driver/receiver designed
for use in bus organized data transmission systems intercon-
nected by terminated 120Ω impedance lines. The external
termination is intended to be 180Ω resistor from the bus to
the +5V logic supply together with a 390Ω resistor from the
bus to ground. The bus can be terminated at one or both
ends. Low bus pin current allows up to 27 driver/receiver
pairs to utilize a common bus. The bus loading is unchanged
when VCC = 0V. The receivers incorporate hysteresis to
greatly enhance bus noise immunity. One two-input NOR
gate is included to disable all drivers in a package simulta-
neously. Receiver performance is optimized for systems with
bus rise and fall times ≤ 1.0 µs/V.
Features
n 4 totally separate driver/receiver pairs per package
n 1V typical receiver input hysteresis
n Receiver hysteresis independent of receiver output load
n Guaranteed minimum bus noise immunity of 1.3V, 2V
typ.
n Temperature-insensitive receiver thresholds track bus
logic levels
n 20 µA typical bus terminal current with normal VCC or
with VCC = 0V
n Open collector driver output allows wire-OR connection
n High speed
n Series 74 TTL compatible driver and disable inputs and
receiver outputs
Typical Application
DS005812-1
© 1999 National Semiconductor Corporation DS005812
www.national.com
1 page  
Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
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Email: [email protected]
www.national.com
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Email: [email protected]
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Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet DS8838.PDF ] | |
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