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LS603A Memory Refresh Controllers
Monolithic chip designed for RAS-only refresh on dynamic RAMs.
- 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
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
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.
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Images are for illustration only; actual product may vary.