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HD74ALVCH162721 - 3.3-V 20-bit Flip Flops with 3-state Outputs

General Description

The HD74ALVCH162721’s twenty flip flops are edge triggered D-type flip flops with qualified clock storage.

On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs, provided that the clock enable (CLKEN ) input is low.

If CLKEN is high, no data is stored.

Key Features

  • VCC = 2.3 V to 3.6 V.
  • Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C).
  • Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C).
  • High output current ±12 mA (@V CC = 3.0 V).
  • Bus hold on data inputs eliminates the need for external pullup / pulldown resistors.
  • All outputs have equivalent 26 Ω series resistors, so no external resistors are required. HD74ALVCH162721 Function Table Inputs OE L L L L H CLKEN H L L L X CLK X ↑ ↑ L or H.

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Full PDF Text Transcription for HD74ALVCH162721 (Reference)

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HD74ALVCH162721 3.3-V 20-bit Flip Flops with 3-state Outputs ADE-205-184B (Z) 3rd. Edition December 1999 Description The HD74ALVCH162721’s twenty flip flops are edge trig...

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1999 Description The HD74ALVCH162721’s twenty flip flops are edge triggered D-type flip flops with qualified clock storage. On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs, provided that the clock enable (CLKEN ) input is low. If CLKEN is high, no data is stored. A buffered output enable ( OE) input can be used to place the twenty outputs in either a normal logic state (high or low level) or a high impedance state. In the high impedance state, the outputs neither load nor drive the bus lines significantly. The high impedance state and increased drive provide the capabilit