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HD74ALVCH16821

Hitachi Semiconductor
Part Number HD74ALVCH16821
Manufacturer Hitachi Semiconductor
Description 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs
Published Mar 23, 2005
Detailed Description HD74ALVCH16821 3.3-V 20-bit Bus Interface Flip Flops with 3-state Outputs ADE-205-171B (Z) 3rd. Edition December 1999 D...
Datasheet PDF File HD74ALVCH16821 PDF File

HD74ALVCH16821
HD74ALVCH16821

Overview
HD74ALVCH16821 3.
3-V 20-bit Bus Interface Flip Flops with 3-state Outputs ADE-205-171B (Z) 3rd.
Edition December 1999 Description The HD74ALVCH16821 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 levels) 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.
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 ±24 mA (@V CC = 3.
0 V) • Bus hold on data inputs eliminates the need for external pullup / pulldown resistors HD74ALVCH16821 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 HD74ALVCH16821 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 23 2Q8 24 GND 25 2Q9 26 2Q10 27 2OE 28 56 1CLK 55 1D1 54 1D2 53 GND 52 1D3 51 1D4 50 VCC 49 1D5 48 1D6 47 1D7 46 GND 45 1D8 44 1D9 43 1D10 42 2D1 41 2D2 40 2D3 39 GND 38 2D4 37 2D5 36 2D6 35 VCC 34 2D7 33 ...


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