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DM74LS491 - 10-Bit Counter

The DM74LS491 by National Semiconductor is a 10-Bit Counter. Below is the official datasheet preview.

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Official preview page of the DM74LS491 10-Bit Counter datasheet (National Semiconductor).

DM74LS491 Product details

Description

The ten-bit counter can count up count down set and load 2 LSB’s 2 MSB’s and 6 middle bits high or low as a group All operations are synchronous with the clock SET overrides LOAD COUNT and HOLD LOAD overrides COUNT COUNT is conditional on CIN otherwise it holds All outputs are enabled when OE is low otherwise HIGH-Z The 24 mA IOL outputs are suitable for driving RAM PROM address lines in video graphics systems

Features

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