DM74LS491 Datasheet - National Semiconductor

DM74LS491 10-Bit Counter

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.

DM74LS491 Features

* Benefits Y Y Y Y Y CRT vertical and horizontal timing generation Bus-structured pinout 24-pin SKINNYDIP saves space TRI-STATE outputs drive bus lines Low current PNP inputs reduce loading Connection Diagram Top View Standard Test Load TL L 8332

* 2 TL L 8332

* 1 Order Number DM

DM74LS491_NationalSemiconductor.pdf