DM8556 - TRI-STATE Programmable Binary Counters

National Semiconductor

DM8556 Datasheet Preview — Preview of DM8556 PDF

Datasheet Details

Part number	DM8556
Manufacturer	National Semiconductor ↗
File Size	155.41 KB
Description	TRI-STATE Programmable Binary Counters
Datasheet	DM8556_NationalSemiconductor.pdf

DM8556 Product details

Description

These circuits are synchronous edge-sensitive fully-programmable 4-bit counters The counters feature both conventional totem-pole and TRI-STATE outputs such that when the outputs are in the high impedance mode they can be used to enter data from the bus lines In addition the clear input operates completely independent of all other inputs During the programming operation data is loaded into the flip-flops on the positive-going edge of the clock pulse To facilitate cascading of these counters the

Features

Y Y Y Y Y Typical clock frequency 35 MHz TRI-STATE outputs Fully independent clear Synchronous loading Cascading circuitry provided internally Connection Diagram Dual-In-Line Package TL F 6588.
1 Order Number DM7556J or DM8556N See NS Package Number J16A or N16A Function Table Control Inputs LOAD H H H H L H H CE X X X X H L L CLK X X L L OD L H L H L L H Reset H H L L L L L I OA L Z QA0 Z a Z I O Ports I OB I OC I OD L Z QD0 Z d Z QA L L QA0 QA0 A Active Outputs QB QC QD L L QD0 Q.

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Published: Nov 23, 2005 |