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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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.
1 X 74LS603 Memory Refresh Controllers IC (74603) DIP-20 Package
Operating voltage | 2.5 3.0V |
Pixel Resolution | 0.3MP |
Photosensitive array | 640 x 480 |
Optical Size | 1.6 inch |
Angel of view | 67 degrees |
Maximum Frame Rate | 30fps VGA |
Sensitivity | 1.3V/(Lux-sec) |
Dormancy | Less than 20A |
Power consumption | 60mW/15fpsVGA YUV |
Temperature operation Range | -30 C ~ 70 C |
Pixel area | 3.6 x 3.6 m |
Signal to noise ratio (SNR) | 46 dB |
Dynamic range | 52 dB |
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