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PDF DS36277 Data sheet ( Hoja de datos )
| Número de pieza | DS36277 | |
| Descripción | Dominant Mode Multipoint Transceiver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 (50Ω), 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
1 page  
Parameter Measurement Information (Continued)
DS011384-6
FIGURE 5. Driver Differential Propagation Delays and Transition Times
DS011384-7
FIGURE 6. Driver Propagation Delay Test Circuit
DS011384-8
FIGURE 7. Driver Propagation Delays
S1 to DO for DI = 3V
S1 to DO for DI = 0V
DS011384-9
FIGURE 8. Driver TRl-STATE Test Circuit (tPZH, tPHZ)
5
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5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Molded Package (SO)
Order Number DS36277TM
NS Package Number M08A
8-Lead Molded Dual-In-Line Package (N)
Order Number DS36277TN
NS Package Number N08E
11
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS36277.PDF ] | |
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