SLLS154C March   1993  – February 2024 SN75ALS1177 , SN75ALS1178

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Driver Section
      1. 5.4.1 Electrical Characteristics
      2. 5.4.2 Switching Characteristics
    5. 5.5 Receiver Section
      1. 5.5.1 Electrical Characteristics
      2. 5.5.2 Switching Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Device Functional Modes
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • NS|16
  • N|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

3 Description

The SN75ALS1177 and SN75ALS1178 dual differential drivers and receivers are integrated circuits designed for bidirectional data communication on multipoint bus transmission lines. The devices are designed for balanced transmission lines, and meet standards TIA/EIA-422-B and TIA/EIA-485-A.

The SN75ALS1177 combines dual 3-state differential line drivers and dual 3-state differential input line receivers, both of which operate from a single 5V power supply. The drivers and receivers have active-high and active-low enables, respectively, which can be externally connected together to function as direction control. The SN75ALS1178 drivers each have an individual active-high enable. Fail-safe design ensures that when the receiver inputs are open, the receiver outputs are always high.

The SN75ALS1177 and SN75ALS1178 are characterized for operation from 0°C to 70°C.

Package Options
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
SN75ALS1177
SN75ALS1178		SOP (NS, 16)10.2mm × 7.8mm
PDIP (N, 16)19.3mm × 9.4mm
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
GUID-0B6F8435-16F3-4F02-8FB6-669C3B018656-low.pngLogic Symbol(1)
GUID-67C1D1E9-9FF3-4883-879C-0DA4B40740F2-low.pngLogic Diagram (Positive Logic)
†. These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.