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PDF DS3697N Data sheet ( Hoja de datos )
| Número de pieza | DS3697N | |
| Descripción | Multipoint RS485/RS422 Transceivers/Repeaters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 1998
DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
The DS3695, DS3696, and DS3697 are high speed differen-
tial TRI-STATE® bus/line transceivers/repeaters designed to
meet the requirements of EIA standard RS485 with extended
common mode range (+12V to −7V), for multipoint data
transmission.
The driver and receiver outputs feature TRI-STATE capabil-
ity. The driver outputs remain in TRI-STATE over the entire
common mode range of +12V to −7V. Bus faults that cause
excessive power dissipation within the device trigger a ther-
mal shutdown circuit, which forces the driver outputs into the
high impedance state. The DS3696 provides an output pin
TS (thermal shutdown) which reports the occurrence of the
thermal shutdown of the device. This is an “open collector”
pin with an internal 10 kΩ pull-up resistor. This allows the line
fault outputs of several devices to be wire OR-ed.
Both AC and DC specifications are guaranteed over the 0˚C
to 70˚C temperature 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 15 ns driver propagation delays with 2 ns skew (typical)
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 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 Diagrams
Top View
DS010408-1
Top View
DS010408-12
Top View
DS010408-13
Order Number DS3695N, DS3695TN,
DS3696N, or DS3697N
See NS Package Number N08E
Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS010408
www.national.com
1 page  
AC Test Circuits and Switching Waveforms (Continued)
DS010408-6
Note: Unless otherwise specified the switches are closed.
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
DS010408-7
DS010408-8
Note: tPLH and tPHL are measured to the respective 50% points. tSKEW is the difference between propagation delays of the complementary outputs.
FIGURE 6. Driver Input-to-Output Propagation Delay Timing (Single-Ended)
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
DS010408-9
DS010408-10
FIGURE 8. Driver Differential Transition Timing
5 www.national.com
5 Page 
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS3697N.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS3697 | Multipoint RS485/RS422 Transceivers/Repeaters | National Semiconductor |
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| DS3697N | Multipoint RS485/RS422 Transceivers/Repeaters | National Semiconductor |
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