MSM54C864 Datasheet, PDF (1/33 Pages) OKI electronic componets – 65,536-Word X 8-Bit Multiport DRAM

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MSM54C864
65,536-Word ¥ 8-Bit Multiport DRAM
This version_M: _SJa_Mn₅. ₄1_C99₈8₆₄
Previous version: Dec. 1996
DESCRIPTION
The MSM54C864 is a 512Kbit CMOS multiport memory composed of a 65,536-word 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 MSM54C864 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 V_BB generator
• All inputs and outputs: TTL compatible
• Multiport organization
RAM port: 64K 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 capability
Fully static register
256 tap location
• RAM-SAM bidirectional, Read / Write / Pseudo write, Real time read transfer
• Refresh : 256 cycles/4 ms
• Package options:
40-pin 475 mil plastic ZIP (ZIP40-P-475-1.27)
(Product : MSM54C864-xxZS)
40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27)
(Product : MSM54C864-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM54C864-70
MSM54C864-80
MSM54C864-10
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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