10-Bit D Flip-Flop
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54AC821 • 54ACT821 10-Bit D Flip-Flop with TRI-STATE Outputs
August 1998
54AC821 • 54ACT821 10-Bi...
Description
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54AC821 54ACT821 10-Bit D Flip-Flop with TRI-STATE Outputs
August 1998
54AC821 54ACT821 10-Bit D Flip-Flop with TRI-STATE ® Outputs
General Description
The ’AC/’ACT821 is a 10-bit D flip-flop with TRI-STATE outputs arranged in a broadside pinout. The ’AC/’ACT821 is functionally identical to the AM29821. n n n n Noninverting outputs Outputs source/sink 24 mA ’ACT821 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) — ’ACT821: 5962-88705 — ’AC821: 5962-91606
Features
n TRI-STATE outputs for bus interfacing
Logic Symbols
Connection Diagrams
Pin Assignment for DIP and Flatpak
DS100355-1
IEEE/IEC
DS100355-3
Pin Assignment for LCC
DS100355-2
Pin Names D0–D9 O0–O9 OE CP
Description Data Inputs Data Outputs Output Enable Input Clock Input
DS100355-4
TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS100355
www.national.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. 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 in...
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