MSM54C865 Datasheet, PDF (1/44 Pages) OKI electronic componets – 65,536-Word X 8-Bit Multiport DRAM

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MSM54C865
65,536-Word ¥ 8-Bit Multiport DRAM
This version_M: _SJ_Man₅. ₄1_C99₈8₆₅
Previous version: Dec. 1996
DESCRIPTION
The MSM54C865 is a 512Kbit CMOS multiport DRAM composed of a 65,536-word by 8-bit
dynamic RAM and a 256-word by 8-bit SAM. Its RAM and SAM operate independently and
asynchronously.
The MSM54C865 supports three types of operaton: 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
MSM54C865 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
• Single power supply: 5 V ±10%
• Full TTL compatibility
• Multiport organization
RAM : 64K word ¥ 8 bits
SAM : 256 word ¥ 8 bits
• Fast page mode
• Write per bit
• Masked flash write
• Masked block write
• RAS only refresh
• CAS before RAS refresh
• Hidden refresh
• Serial read/write
• 256 tap location
• Bidirectional data transfer
• Split transfer
• Masked write transfer
• Refresh :256 cycles/4 ms
• Package options:
40-pin 475 mil plastic ZIP (ZIP40-P-475-1.27)
40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27)
(Product : MSM54C865-xxZS)
(Product : MSM54C865-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM54C865-70
MSM54C865-80
MSM54C865-10
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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