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DS36277TM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer DS36277TM
Beschreibung Dominant Mode Multipoint Transceiver
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
DS36277TM Datasheet, Funktion
July 1998
DS36277
Dominant Mode Multipoint Transceiver
General Description
The DS36277 Dominant Mode Multipoint Transceiver is de-
signed for use on bi-directional differential busses. It is opti-
mal for use on Interfaces that utilize Society of Automotive
Engineers (SAE) J1708 Electrical Standard.
The device is similar to standard TIA/EIA-485 transceivers,
but differs in enabling scheme. The Driver’s Input is normally
externally tied LOW, thus providing only two states: Active
(LOW), or Disabled (OFF). When the driver is active, the
dominant mode is LOW, conversely, when the driver is dis-
abled, the bus is pulled HIGH by external bias resistors.
The receiver provides a FAILSAFE feature that guarantees a
known output state when the Interface is in the following con-
ditions: Floating Line, Idle Line (no active drivers), and Line
Fault Conditions (open or short). The receiver output is
HIGH for the following conditions: Open Inputs, Terminated
Inputs (50), or Shorted Inputs. FAILSAFE is a highly desir-
able feature when the transceivers are used with Asynchro-
nous Controllers such as UARTs.
Features
n FAILSAFE receiver, RO = HIGH for:
— OPEN inputs
— Terminated inputs
— SHORTED inputs
n Optimal for use in SAE J1708 Interfaces
n Compatible with popular interface standards:
— TIA/EIA-485 and TIA/EIA-422-A
— CCITT recommendation V.11
n Bi-directional transceiver
— Designed for multipoint transmission
n Wide bus common mode range
— (−7V to +12V)
n Available in plastic DIP and SOIC packages
Connection and Logic Diagram
Truth Tables
DS011384-1
Order Number DS36277TM or DS36277TN
See NS Package Number M08A or N08E
Driver
Inputs
DE DI
LL
LH
HX
Outputs
DO/RI
DO /RI
LH
HL
ZZ
Receiver
Inputs
RE DO/RI–DO /RI
L 0 mV
L −500 mV
L SHORTED
L OPEN
HX
Output
RO
H
L
H
H
Z
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011384
www.national.com






DS36277TM Datasheet, Funktion
Parameter Measurement Information (Continued)
DS011384-10
FIGURE 9. Driver TRI-STATE Delays (tPZH, tPHZ)
S1 to DO for DI = 0V
S1 to DO for DI = 3V
DS011384-11
FIGURE 10. Driver TRI-STATE Test Circuit (tPZL, tPLZ)
DS011384-12
FIGURE 11. Driver TRl-STATE Delays (tPZL, tPLZ)
www.national.com
DS011384-13
FIGURE 12. Receiver VOH and VOL
DS011384-14
FIGURE 13. Receiver Propagation Delay Test Circuit
6

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DS36277TM pdf, datenblatt
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VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI-
CONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or sys- 2. A critical component is any component of a life support
tems which, (a) are intended for surgical implant into
device or system whose failure to perform can be rea-
the body, or (b) support or sustain life, and whose fail-
sonably expected to cause the failure of the life support
ure to perform when properly used in accordance
device or system, or to affect its safety or effectiveness.
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
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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.

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