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HD74ALVCH162721 Datasheet

3.3-V 20-bit Flip Flops

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HD74ALVCH162721
3.3-V 20-bit Flip Flops with 3-state Outputs
REJ03D0044-0400Z
(Previous ADE-205-184B (Z) )
Rev.4.00
Oct.02.2003
Description
The HD74ALVCH162721’s twenty flip flops are edge triggered D-type flip flops with qualified clock
storage. On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs,
provided that the clock enable (CLKEN) input is low. If CLKEN is high, no data is stored. A buffered
output enable (OE) input can be used to place the twenty 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 lines
without need for interface or pullup components. The output enable (OE) input does not affect the internal
operation 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 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 series resistors, so no external resistors are required.
Rev.4.00, Oct.02.2003, page 1 of 11


Renesas Electronics Components Datasheet

HD74ALVCH162721 Datasheet

3.3-V 20-bit Flip Flops

No Preview Available !

HD74ALVCH162721
Function Table
Inputs
Output Q
OE
CLKEN
CLK
D
L H X X Q0 *1
L L HH
L L LL
L
L
L or H
X
Q0 *1
HX XXZ
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.
Rev.4.00, Oct.02.2003, page 2 of 11


Part Number HD74ALVCH162721
Description 3.3-V 20-bit Flip Flops
Maker Renesas
Total Page 12 Pages
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