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Fairchild Semiconductor |
March 1990
Revised November 1998
74ACTQ821
Quiet Series™ 10-Bit D-Type Flip-Flop
with 3-STATE Outputs
General Description
The ACTQ821 is a 10-bit D-type flip-flop with non-inverting
3-STATE outputs arranged in a broadside pinout. The
ACTQ821 utilizes Fairchild’s Quiet Series™ technology to
guarantee quiet output switching and improved dynamic
threshold performance. FACT Quiet Series™ features
GTO™ output control and undershoot corrector in addition
to a split ground bus for superior performance.
Features
s Guaranteed simultaneous switching noise level and
dynamic threshold performance
s Guaranteed pin-to-pin skew AC performance
s Non-inverting 3-STATE outputs for bus interfacing
s 4 kV minimum ESD immunity
s Outputs source/sink 24 mA
s Functionally identical to the AM29821
Ordering Code:
Order Number Package Number
Package Description
74ACTQ821SC
M24B
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide Body
74ACTQ821SPC
N24C
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300” Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
Pin Assignment
for DIP and SOIC
IEEE/IEC
Pin Descriptions
Pin Names
D0–D9
O0–O9
OE
CP
Description
Data Inputs
Data Outputs
Output Enable Input
Clock Input
FACT™, Quiet Series™, FACT Quiet Series™, and GTO™ are trademarks of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation DS010686.prf
www.fairchildsemi.com
Functional Description
The ACTQ821 consists of ten-bit 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. 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.
The ACTQ821 is functionally and pin compatible with the
AM29821.
Logic Diagram
Function Table
Inputs
Internal
OE CP D
H L
H H
L L
L H
Q
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
Z = HIGH Impedance
= LOW-to-HIGH Clock Transition
Outputs Function
O
Z High Z
Z High Z
L Load
H Load
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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