74LS603 Memory Refresh Controllers IC (74603) DIP-20 Package

The LS603A memory refresh controllers contain one 8-bit synchronous counter, nine 3-state buffer drivers, four RC controlled multivibrators, and other control circuitry on a single monolithic chip. These devices are designed to provide RAS-only refresh on 4K, 16K, and 64K dynamic RAMs. The LS600A and LS601A provide transparent refresh while the LS603A provides cycle steal refresh. in addition, a burst-mode timer is provided to warn the CPU that the maximum allowable refresh time is about to be violated. Features :- Controls Refresh Cycle of 4K, 16K, and 64K Dynamic RAMS Creates Static RAM Appearance Choice of Transparent. Cycle Steal, or Burst Refresh Modes 3-State Outputs Drive Bus Lines Directly Critical Times Are User RC-Programmable to Optimize System Performance Specifications :- Supply Voltage Min : 4.75V Supply Voltage Max : 5.25V High Level output Current Max : -2.6mA Low Level output Current Max : 24mA Supply Current : 85mA Package Includes :- 1 X 74LS603 Memory Refresh Controllers IC (74603) DIP-20 Package