MSM518121A Datasheet, PDF (1/33 Pages) OKI electronic componets – 131,072-Word X 8-Bit Multiport DRAM

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MSM518121A
131,072-Word ¥ 8-Bit Multiport DRAM
This versio_Mn_S: _MJa₅n₁. ₈19₁9₂8_1A
Previous version: Dec. 1996
DESCRIPTION
The MSM518121A is an 1-Mbit CMOS multiport memory composed of a 131,072-words by 8-bit
dynamic random access memory, RAM port, and a 256-word by 8-bit static serial access memory,
SAM port. The RAM port and SAM port operate independently and asynchronously.
The MSM518121A supports three types of operation: random access to and from the RAM port,
high speed serial access to and from the SAM port and bidirectional transfer of data between any
selected row in the RAM port and the SAM port. The RAM port and the SAM port can be accessed
independently except when data is being transferred between them internally.
FEATURES
• Single power supply of 5 V ±10% with a built-in VBB generator
• All inputs and outputs :TTL compatible
• Multiport organization
RAM port : 128K word ¥ 8 bits
SAM port : 256 word ¥ 8 bits
• RAM port
Fast page mode, Read modify write
CAS before RAS refresh, Hidden refresh
RAS only refresh, Standard write-per-bit
• SAM port
High speed serial
Read / Write capabillity
Fully static register
256 tap location
• RAM-SAM bidirectional, Read / Write / Pseudo write, Real time read transfer
• Package options:
40-pin 475 mil plastic ZIP (ZIP40-P-475-1.27)
(Product : MSM518121A-xxZS)
40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27)
(Product : MSM518121A-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM518121A-70
MSM518121A-80
MSM518121A-10
Access Time
RAM SAM
70 ns 25 ns
80 ns 25 ns
100 ns 25 ns
Cycle Time
RAM SAM
140 ns 30 ns
150 ns 30 ns
180 ns 30 ns
Power Dissipation
Operating Standby
120 mA
8 mA
110 mA
8 mA
100 mA
8 mA
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