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HD74ALVCH162260

Hitachi Semiconductor
Part Number HD74ALVCH162260
Manufacturer Hitachi Semiconductor
Description 12-bit to 24-bit Multiplexed D-type Latches with 3-state Outputs
Published Mar 23, 2005
Detailed Description HD74ALVCH162260 12-bit to 24-bit Multiplexed D-type Latches with 3-state Outputs ADE-205-177B (Z) 3rd. Edition December...
Datasheet PDF File HD74ALVCH162260 PDF File

HD74ALVCH162260
HD74ALVCH162260

Overview
HD74ALVCH162260 12-bit to 24-bit Multiplexed D-type Latches with 3-state Outputs ADE-205-177B (Z) 3rd.
Edition December 1999 Description The HD74ALVCH162260 is a 12-bit to 24-bit multiplexed D-type latch used in applications where two separate data paths must be multiplexed onto, or demultiplexed from, a single data path.
Typical applications include multiplexing and / or demultiplexing of address and data information in microprocessor or bus interface applications.
This device is also useful in memory interleaving applications.
Three 12-bit I / O ports (A1-A12, 1B1-1B12, and 2B1-2B12) are available for address and / or data transfer.
The output enable (OE1B, OE2B, and OEA) inputs control the bus transceiver functions.
The OE1B and OE2B control signals also allow bank control in the A-to-B direction.
Address and / or data information can be stored using the internal storage latches.
The latch enable (LE1B, LE2B, LEA1B, and LEA2B) inputs are used to control data storage.
When the latch enable input is high, the latch is transparent.
When the latch enable input goes low, the data present at the inputs is latched and remains latched until the latch enable input is returned high.
Active bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level.
The B outputs, which are designed to sink up to 12 mA, include 26 Ω resistors to reduce overshoot and undershoot.
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 • B-port outputs have equivalent 26 Ω series resistors, so no external resistors are required.
HD74ALVCH162260 Function Table Inputs 1B H L X X X X X 2B X X X H L X X SEL H H H L L L X LE1B H H L X X X X LE2B X X X H H L X OEA L L L L L L H H L A0 *1 H L A0 *1 Z Output A B-to-A (OEB = H) Inputs A H ...


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