SN74ALS996DWR

Overview

The SN74ALS996DWR is an octal D-type edge-triggered latch with read-back capability, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 35 MHz. The device features three-state outputs and inputs, allowing data to be stored in flip-flops or read back onto the input bus. Propagation delay from CLK to Q ranges from 5 ns to 28 ns. It is housed in a 24-pin SOIC (DW) package and functions over an operating temperature range of 0°C to 70°C.

Feature Summary

• Provides read-back functionality that allows stored data to be transferred directly onto the input data bus via the RD control signal.
• Features edge-triggered operation where data enters on the low-to-high transition of the clock when the enable input is low.
• Includes polarity control through the T/C input to select between true or complementary data at the Q outputs.

Applications

• Storing contents of an input data bus for subsequent processing
• Bus-structured pinout applications requiring bidirectional I/O ports
• Systems requiring asynchronous clear and output tri-state control

Procurement Notes

Verify the specific ordering suffix 'DWR' corresponds to the tape-and-reel packaging format rather than tube packaging. Confirm RoHS compliance status and lead finish details against the latest TI Package Option Addendum. Ensure the procurement channel provides valid traceability for this active production part number.

Selection Notes

Select this component when an octal latch requires simultaneous write and read-back capabilities on the same bus lines. The ALS series offers faster switching speeds compared to standard LS logic. Verify that the system voltage remains within the 4.5 V to 5.5 V range to ensure proper logic levels and current drive specifications are met.

Part Context

This device belongs to the SN74ALS996 family of octal latches. It shares functional similarities with other ALS series components but is distinct due to its integrated read-back circuitry. The DW package variant is specifically designed for surface-mount applications, differing from ceramic or DIP options available in the broader product line.

Replacement Considerations

SN74ALS996DW is a parameter-equivalent alternative available in tube packaging instead of tape-and-reel.