54ACT821

www.DataSheet4U.com 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...