HD74ALVCH162334 Datasheet, PDF (1/13 Pages) Hitachi Semiconductor – 16-bit Universal Bus Driver with 3-state Outputs

HD74ALVCH162334
16-bit Universal Bus Driver with 3-state Outputs
ADE-205-210 (Z)
Preliminary
1st. Edition
December 1997
Description
This HD74ALVCH162334 is a 16-bit universal bus driver is designed for 2.3 V to 3.6 V V_CC operation.
Data flow from A to Y is controlled by the output enable (O E) input. The device operates in the
transparent mode when the latch enable (LE) input is low. When LE is high, the A data is latched if the
clock (CLK) input is held at a high or low logic level. If LE is high, the A data is stored in the latch/flip
flop on the low to high transition of CLK. When OE is high, the outputs are in the high impedance state.
To ensure the high impedance state during power up or power down, OE should be tied to V_CC through a
pullup resistor; the minimum value of the resistor is determined by the current sinking capability of the
driver.
Active bus hold circuitry is provided to hold unused or floating data inputs at a valid logic level. All
outputs, which are designed to sink up to 12 mA, include 26 Ω resistors to reduce overshoot and
undershoot.
Features
• V_CC = 2.3 V to 3.6 V
• Typical V_OL ground bounce < 0.8 V (@V_CC = 3.3 V, Ta = 25°C)
• Typical V_OH undershoot > 2.0 V (@V_CC = 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