MSM514252A Datasheet, PDF (1/33 Pages) OKI electronic componets – 262,144-Word x 4-Bit Multiport DRAM

E2L0012-17-Y1
¡ _¡ Semicond_Suc_etor_miconductor
MSM514252A
262,144-Word ¥ 4-Bit Multiport DRAM
This versio_Mn_S: _MJa₅n₁. ₄19₂9₅8_2A
Previous version: Dec. 1996
DESCRIPTION
The MSM514252A is an 1-Mbit CMOS multiport DRAM composed of a 262,144-word by 4-bit
dynamic RAM, and a 512-word by 4-bit static serial access memory, SAM port. The RAM port
and SAM port operate independently and asynchronously.
The MSM514252A supports three types of operations: 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: 256K word ¥ 4 bits
SAM port: 512 word ¥ 4 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
512 tap location
• RAM-SAM bidirectional, Read/Write/Pseudo write, Real time read transfer
• Package options:
28-pin 400 mil plastic ZIP (ZIP28-P-400-1.27)
(Product : MSM514252A-xxZS)
28-pin 400 mil plastic SOJ (SOJ28-P-400-1.27)
(Product : MSM514252A-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM514252A-70
MSM514252A-80
MSM514252A-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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