DESCRIPTION
The MSM54V16272 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.

FEATURES
• Single power supply: 3.3 V ±0.3 V
• Full TTL compatibility
• Multiport organization
    RAM : 256K word x 16 bits
    SAM : 512 word x 16 bits
• Fast page mode
• Write per bit
• Byte read/write
• Masked flash write
• Masked block write (8 columns)
• RAS only refresh
• CAS before RAS refresh
• CAS before RAS self-refresh
• Hidden refresh
• Serial read/write
• 512 tap location
• Bidirectional data transfer
• Split transfer
• Masked write transfer
• Refresh: 512 cycles/8 ms
• Package options:
    64-pin 525 mil plastic SSOP (SSOP64-P-525-0.80-K) (Product : MSM54V16272-xxGS-K)
    70/64-pin 400 mil plastic TSOP (Type II)(TSOPII70/64-P-400-0.65-K)(Product : MSM54V16272-xxTS-K)
                                                                                                  xx indicates speed rank.