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HD74ALVCHR162269A - 12-bit to 24-bit Registered Bus Exchanger with 3-state Outputs

Description

The HD74ALVCHR162269A is a 12-bit to 24-bit registered bus exchanger, which is intended for applications where two separate ports must be multiplexed onto, or de-multiplexed from, a single port.

It is particularly suitable as an interface between synchronous DRAMs and high speed microprocessors.

Features

  • All outputs have equivalent 26 Ω series resistors, so no external resistors are required.
  • Bus hold on data inputs eliminates the need for external pullup / pulldown resistors. HD74ALVCHR162269A Function Table Inputs CLK ↑ ↑ ↑ OEA H H L OEB H L H Outputs A Z Z Active 1B, 2B Z Active Z Output-enable table Inputs CLKENA1 L L L L H H H CLKENA2 H H L L L L H CLK ↑ ↑ ↑ ↑ ↑ ↑ X A L H L H L H X Outputs 1B L H L H 1B0 1B0 1B0.
  • 1.
  • 1.
  • 1 2B 2B0 2B0 L H L H 2B0.
  • 1.

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Other Datasheets by Hitachi Semiconductor (now Renesas)

Part Number Description
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Full PDF Text Transcription

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HD74ALVCHR162269A 12-bit to 24-bit Registered Bus Exchanger with 3-state Outputs ADE-205-125 (Z) Preliminary 1st. Edition January 1998 Description The HD74ALVCHR162269A is a 12-bit to 24-bit registered bus exchanger, which is intended for applications where two separate ports must be multiplexed onto, or de-multiplexed from, a single port. It is particularly suitable as an interface between synchronous DRAMs and high speed microprocessors. The HD74ALVCHR162269A is designed specifically for low voltage (from 2.5 V to 3.3 V) VCC operation. Data is stored in the internal B-port registers on the low to high transition of the CLK input, provided that the appropriate CLKENA inputs are low.
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