Features: ·Meets EIA standards RS232-C, RS422 and RS423, Federal Standards 1020, 1030 and MIL-188-114
·Input voltage range of ±15V (differential or common-mode)
·Separate strobe input for each receiver
·5k typical input impedance
·Optional 180W termination resistor
·50 mV input hysteresis
·200 mV input threshold
·Separate fail-safe modePinout
Specifications
| Drivers |
0 |
| Receivers |
2 |
| SupplyVoltage |
5 Volt |
| Process |
Bipolar |
| Temperature Min |
-55 deg C |
| Temperature Max |
125 deg C |
| View Using Catalog |
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Supply Voltage .....................................................7V
Input Voltage ..................................................±25V
Strobe Voltage .....................................................7V
Output Sink Current .......................................50 mA
Storage Temperature Range..... −65°C to +150°C
Maximum Power Dissipation (Note 1) at 25°C
Cavity Package ..........................................1433 mV
Molded Package .......................................1362 mW
Lead Temperature (Soldering, 4 sec) ...........260°CDescriptionThe DS78LS120 is a high performance, dual differential, TTL compatible line receiver for both balanced and unbalanced digital data transmission. The inputs are compatible with EIA, Federal and MIL standards.
The line receiver DS78LS120 will discriminate a ±200 mV input signal over a common-mode range of ±10V and a ±300 mV signal over a range of ±15V.
Circuit DS78LS120 features include hysteresis and response control for applications where controlled rise and fall times and/or high frequency noise rejection are desirable. Threshold offset control is provided for fail-safe detection, should the input be open or short. Each receiver includes an optional 180 terminating resistor and the output gate contains a logic strobe for time discrimination. The DS78LS120 is specified over a -55°C to +125°C temperature range.
Input specifications of DS78LS120 meet or exceed those of the popular DS7820 line receiver.
Application Notes
| Title |
Size in Kbytes |
Date |
|
| AN-214: Application Note 214 Transmission Line Drivers and Receivers for TIA/EIA Standards RS‐422 and RS‐423 |
338 Kbytes |
4-Oct-04 |
Download |
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The DS78LS120 and DS88LS120 are high performance,
dual differential, TTL compatible line receivers for both balanced
and unbalanced digital data transmission. The inputs
are compatible with EIA, Federal and MIL standards.
The line receiver will discriminate a ±200 mV input signal over a common-mode range of ±10V and a ±300 mV signal over a range of ±15V.
Circuit features include hysteresis and response control for applications where controlled rise and fall times and/or high frequency noise rejection are desirable. Threshold offset control is provided for fail-safe detection, should the input be open or short. Each receiver includes an optional 180W terminating resistor and the output gate contains a logic strobe for time discrimination. The DS78LS120 is specified over a −55°C to +125°C temperature range and the DS88LS120 from 0°C to +70°C. Input specifications meet or exceed those of the popular DS7820/DS8820 line receiver.
DS78LS120 Data Sheet
