SN74ALS992 9-Bit D-Type Transparent Read-Back Latches With 3-State Outputs |

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9-Bit D-Type Transparent Read-Back Latches With 3-State Outputs



This 9-bit latch is designed specifically for storing the contents of the input data bus and providing the capability of reading back the stored data onto the input data bus. In addition, this device provides a 3-state buffer-type output and is easily implemented in parity applications.

The nine latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. The Q outputs are in the 3-state condition when the output-enable () input is high.

Read back is provided through the output-enable () input. When is taken low, the data present at the output of the data latches is allowed to pass back onto the input data bus. When is taken high, the output of the data latches is isolated from the D inputs. does not affect the internal operation of the latches; however, precautions should be taken not to create a bus conflict.

The SN74ALS992 is characterized for operation from 0°C to 70°C.


  • 3-State I/O-Type Read-Back Inputs
  • Bus-Structured Pinout
  • True Logic Outputs
  • Designed With Nine Bits for Parity Applications
  • Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (NT) 300-mil DIPs



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Part number Order Technology Family Input type Output type VCC (Min) (V) VCC (Max) (V) IOL (Max) (mA) IOH (Max) (mA) Rating Package Group
SN74ALS992 Order now ALS     TTL     TTL     4.5     5.5     24     2.6     Catalog     SOIC | 24