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HD74ALVCH162821

Hitachi Semiconductor
Part Number HD74ALVCH162821
Manufacturer Hitachi Semiconductor
Description 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs
Published Mar 23, 2005
Detailed Description HD74ALVCH162821 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs ADE-205-186A (Z) 2nd. Edition September 1997...
Datasheet PDF File HD74ALVCH162821 PDF File

HD74ALVCH162821
HD74ALVCH162821

Overview
HD74ALVCH162821 3.
3-V 20-bit Bus Interface Flip Flops with 3-state Outputs ADE-205-186A (Z) 2nd.
Edition September 1997 Description The HD74ALVCH162821 can be used as two 10-bit flip flops or one 20-bit flip flop.
The 20 flip flops are edge triggered D-type flip flops.
On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs.
A buffered output enable ( OE) input can be used to place the ten 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 capability to drive bus line without need for interface or pullup components.
The output enable (OE) input does not affect the internal operations of the flip flops.
Old data can be retained or new data can be entered while the outputs are in the high impedance state.
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 • 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 (@VCC = 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.
HD74ALVCH162821 Function Table Inputs OE L L L H CLK ↑ ↑ H or L X D H L X X H L Q0 *1 Z Output Q H : High level L : Low level X : Immaterial Z : High impedance ↑ : Low to high transition Note: 1.
Output level before the indicated steady state input conditions were established.
2 HD74ALVCH162821 Pin Arrangement 1OE 1 1Q1 2 1Q2 3 GND 4 1Q3 5 1Q4 6 VCC 7 1Q5 8 1Q6 9 1Q7 10 GND 11 1Q8 12 1Q9 13 1Q10 14 2Q1 15 2Q2 16 2Q3 17 GND 18 2Q4 19 2Q5 20 2Q6 21 VCC 22 2Q7 ...


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