256K x 4 VRAM FPM
Documents
Description
The MSM514262 is
a 1-Mbit CMOS multiport DRAM composed of a 262,144-word by 4-bits dynamic RAM
and a 512-word by 4-bit SAM. Its RAM and SAM operate independently and
asynchronously.
The MSM514262 supports three types of operation: random access to RAM port,
high speed serial access to SAM port and bidirectional transfer of data between
any selected row in the RAM port and the SAM port. In addition to the
conventional multiport DRAM operating modes, the MSM514262 features the block
write and flash write functions on the RAM port and a split data transfer
capability on the SAM port. The SAM port requires no refresh operation because
it uses static CMOS flip-flops.
Features
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Single power supply: 5 V ±10% |
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Full TTL compatibility |
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Multiport organization
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RAM: 256K-word x 4-bits |
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SAM: 512-word x 4-bits | |
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Fast page mode |
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Write per bit |
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Masked flash write |
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Masked block write |
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*RAS only refresh |
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*CAS before *RAS refresh |
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Hidden refresh |
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Serial read / write |
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512 tap location |
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Bidirectional data transfer |
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Split transfer |
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Masked write transfer |
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Refresh: 512 cycles / 8ms |
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Package options:
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28-pin 400 mil plastic ZIP (ZIP28-P-400-1.27)
(Product :
MSM514262-xxZS) |
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28-pin 400 mil plastic SOJ (SOJ28-P-400-1.27)
(Product :
MSM514262-xxJS) |
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xx indicates speed rank.
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