74AC821 Fairchild Semiconductor, 74AC821 Datasheet - Page 2

• Manufacturer Part Number: 74AC821
• Description: 10-Bit D-Type Flip-Flop with 3-STATE Outputs
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The AC/ACT821 consists of ten D-type edge-triggered flip-
flops. The buffered Clock (CP) and buffered Output Enable
(OE) are common to all flip-flops. The flip-flops will store
the state of their individual D inputs that meet the setup and
hold time requirements on the LOW-to-HIGH CP transition.
Function Table
H
L

Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
Z
LOW Voltage Level
HIGH Voltage Level
HIGH Impedance
LOW-to-HIGH Clock Transition
OE
H
H
L
L
Inputs
CP




D
L
H
L
H
2
Internal
With OE LOW the contents of the flip-flops are available at
the outputs. When OE is HIGH the outputs go to the high
impedance state. Operation of the OE input does not affect
the state of the flip-flops.
Q
H
H
L
L
Outputs
O
Z
Z
H
L
High Z
High Z
Load
Load
Function