DS3696N National Semiconductor, DS3696N Datasheet

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DS3696N

Manufacturer Part Number
DS3696N
Description
Multipoint RS485/RS422 Transceivers/Repeaters
Manufacturer
National Semiconductor
Datasheets

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© 1998 National Semiconductor Corporation
DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
The DS3695, DS3696, and DS3697 are high speed differen-
tial TRI-STATE
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 k 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.
Connection and Logic Diagrams
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.
®
bus/line transceivers/repeaters designed to
Top View
Top View
DS010408
DS010408-1
DS010408-13
Order Number DS3695N, DS3695TN,
See NS Package Number N08E
DS3696N, or DS3697N
Features
n Meets EIA standard RS485 for multipoint bus
n 15 ns driver propagation delays with 2 ns skew (typical)
n Single +5V supply
n −7V to +12V bus common mode range permits
n Thermal shutdown protection
n High impedance to bus with driver in TRI-STATE or with
n Combined impedance of a driver output and receiver
n 70 mV typical receiver hysteresis
transmission and is compatible with RS-422
ground difference between devices on the bus
power off, over the entire common mode range allows
the unused devices on the bus to be powered down
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
Top View
DS010408-12
www.national.com
May 1998
±
7V

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DS3696N Summary of contents

Page 1

... Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing transceivers on the bus typical receiver hysteresis DS010408-13 Order Number DS3695N, DS3695TN, DS3696N, or DS3697N See NS Package Number N08E May 1998 ± 7V DS010408-12 Top View ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Control Input Voltages Driver Input Voltage Driver Output Voltages Receiver Input Voltages (DS3695, DS3696) Receiver Common Mode Voltage ...

Page 3

Electrical Characteristics < < 0˚C T +70˚C, 4.75V V 5.25V unless otherwise specified A CC Symbol Parameter I Supply Current CC I Driver Short-Circuit Output Current OSD I Receiver Short-Circuit Output Current OSR Note 2: “Absolute Maximum Ratings” are those ...

Page 4

AC Test Circuits and Switching Waveforms FIGURE 2. Receiver Propagation Delay Test Circuit Note: Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V. FIGURE 3. Receiver Input-to-Output Propagation Delay Timing FIGURE 4. Receiver ...

Page 5

AC Test Circuits and Switching Waveforms Note: Unless otherwise specified the switches are closed. FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits Note: t and t are measured to the respective 50% points. t PLH PHL FIGURE 6. ...

Page 6

Function Tables DS3695/DS3696 Transmitting Inputs DS3695/DS3696 Receiving Inputs DS3697 Inputs E RI-RI 1 +0.2V 1 −0. +0.2V 1 −0.2V ...

Page 7

Typical Performance Characteristics Driver Temperature OH DS010408-19 Driver DS010408-22 Driver Single-Ended Propagation Delay vs Temperature DS010408-25 Driver Driver ...

Page 8

Typical Performance Characteristics Driver Transition Time DS010408-28 Supply Current vs Temperature DS010408-30 Driver Short Circuit Current vs Temperature DS010408-33 www.national.com (Continued) Cable Length vs Data Rate Supply Current vs Power Supply Voltage DS010408-31 Receiver ...

Page 9

Typical Performance Characteristics Receiver Temperature DS010408-36 Receiver Differential Propagation Delay DS010408-39 Receiver Non-Inverting Input Current vs Temperature DS010408-42 (Continued) Receiver DS010408-37 Receiver Short ...

Page 10

Typical Performance Characteristics Receiver Inverting Input Current vs Power Supply Voltage DS010408-45 www.national.com (Continued) Hysteresis and Differential Transition Voltage vs Temperature DS010408-46 10 Hysteresis and Differential Transition Voltage DS010408-47 ...

Page 11

11 ...

Page 12

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number DS3695N, DS3696N, DS3697N, or DS3695TN LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1 ...

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