DS3696A General Description
The DS3695A and DS3696A are high speed differential TRI-STATE bus/line transceivers designed to meet the re-quirements of EIA standard RS485 with extended common mode range (+12V to -7V), for multipoint data transmission.Inaddition they are compatible with requirements of RS-422.
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 DS3696Aprovides an output pin (TS) which reports the thermal shutdown of the device.TS is an"opencollector"pinwithaninternal10kpull-upresistor.This allows the TS outputs of several devices to be wire OR-ed.
BothAC and DC specifications are guaranteed over the 0 to 70 temperature and 4.75V to 5.25V supply voltage range.
DS3696A Maximum Ratings
If Military/Aerospace specified devices are required,pleasecontacttheNationalSemiconductorSalesOffice/Distributors for availability and specifications.
Supply Voltage, VCC 7V
Control Input Voltages 7V
Driver Input Voltage 7V
Driver Output Voltages +15V/-10V
Receiver Input Voltages +15V/-10V
Receiver Output Voltage 5.5V
Continuous Power Dissipation 25
M Package 630 mW (Note 4)
Storage Temp. Range -65 to +150
Lead Temp. (Soldering 4 seconds) 260
DS3696A Features
Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422
10 ns driver propagation delays (typical)
Single +5V supply
-7V to +12V bus common mode range permits ±7V ground difference between devices on the bus
Thermal shutdown protection
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
Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32 transceivers on the bus
70 mV typical receiver hysteresis
Available in SOIC packaging
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