MSM5416273 Datasheet, PDF (1/40 Pages) OKI electronic componets – 262,144-Word x 16-Bit Multiport DRAM

E2L0021-17-Y1
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MSM5416273
262,144-Word ¥ 16-Bit Multiport DRAM
This versio_Mn:_SMJan₅.₄1₁9₆9₂8₇₃
Previous version: Dec. 1996
DESCRIPTION
The MSM5416273 is a 4-Mbit CMOS multiport DRAM composed of a 262,144-word by 16-bit
dynamic RAM, and a 512-word by 16-bit SAM. Its RAM and SAM operate independently and
asynchronously.
It supports three types of operations: 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 MSM5416273
features block write, flash write functions, extended page mode on the RAM port, a split data
transfer capability, and programmable stops 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%
• RAS only refresh
• Full TTL compatibility
• CAS before RAS refresh
• Multiport organization
• Hidden refresh
RAM : 256K word ¥ 16 bits
• Serial read/write
SAM : 512 word ¥ 16 bits
• 512 tap location
• Extended page mode
• Programmable stops
• Write per bit
• Bidirectional data transfer
• Persistent write per bit
• Split transfer
• Byte read/write
• Masked write transfer
• Masked flash write
• Refresh: 512 cycles/8 ms
• Masked block write (8 columns)
• Package:
64-pin 525 mil plastic SSOP (SSOP64-P-525-0.80-K) (Product : MSM5416273-xxGS-K)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM5416273-50
MSM5416273-60
MSM5416273-70
Access Time
RAM SAM
50 ns 17 ns
60 ns 18 ns
70 ns 20 ns
Cycle Time
RAM SAM
110 ns 20 ns
120 ns 22 ns
140 ns 22 ns
Power Dissipation
Operating
Standby
180 mA
8 mA
170 mA
8 mA
160 mA
8 mA
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