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PDF DS75176BT Data sheet ( Hoja de datos )
| Número de pieza | DS75176BT | |
| Descripción | Multipoint RS-485/RS-422 Transceivers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 1998
DS75176B/DS75176BT
Multipoint RS-485/RS-422 Transceivers
General Description
The DS75176B is a high speed differential TRI-STATE®
bus/line transceiver designed to meet the requirements of
EIA standard RS485 with extended common mode range
(+12V to −7V), for multipoint data transmission. In addition, it
is compatible with RS-422.
The driver and receiver outputs feature TRI-STATE capabil-
ity, for the driver outputs over the entire common mode
range of +12V to −7V. Bus contention or fault situations that
cause excessive power dissipation within the device are
handled by a thermal shutdown circuit, which forces the
driver outputs into the high impedance state.
DC specifications are guaranteed over the 0 to 70˚C tem-
perature and 4.75V to 5.25V supply voltage range.
Features
n Meets EIA standard RS485 for multipoint bus
transmission and is compatible with RS-422.
n Small Outline (SO) Package option available for
minimum board space.
n 22 ns driver propagation delays.
n Single +5V supply.
n −7V to +12V bus common mode range permits ±7V
ground difference between devices on the bus.
n Thermal shutdown protection.
n High impedance to bus with driver in TRI-STATE or with
power off, over the entire common mode range allows
the unused devices on the bus to be powered down.
n Pin out compatible with DS3695/A and SN75176A/B.
n Combined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus.
n 70 mV typical receiver hysteresis.
Connection and Logic Diagram
DS008759-1
Top View
Order Number DS75176BN, DS75176BTN, DS75176BM or DS75176BTM
See NS Package Number N08E or M08A
TRI-STATE® is a registered trademark of National Semiconductor Corp.
© 1999 National Semiconductor Corporation DS008759
www.national.com
1 page  
Switching Time Waveforms (Continued)
FIGURE 6. Driver Enable and Disable Times
DS008759-7
Note: Differential input voltage may may be realized by grounding RI and pulsing RI between +2.5V and −2.5V
FIGURE 7. Receiver Propagation Delays
DS008759-8
FIGURE 8. Receiver Enable and Disable Times
Function Tables
DS75176B Transmitting
Inputs
RE DE
X1
X1
X0
X1
DI
1
0
X
X
Line
Condition
No Fault
No Fault
X
Fault
Outputs
DO DO
01
10
ZZ
ZZ
5
DS008759-9
www.national.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS75176BT.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS75176B | Multipoint RS-485/RS-422 Transceivers | National Semiconductor |
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| DS75176BM | Multipoint RS-485/RS-422 Transceivers | National Semiconductor |
| DS75176BN | Multipoint RS-485/RS-422 Transceivers | National Semiconductor |
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