DESCRIPTION
The MSM514262 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 SAM. Its RAM and SAM operate independently and asynchronously.

FEATURES
• Single power supply: 5 V ±10%
• Full TTL compatibility
• Multiport organization
    RAM: 256K word x 4 bits
    SAM: 512 word x 4 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
• 512 tap location
• Bidirectional data transfer
• Split transfer
• Masked write transfer
• Refresh: 512 cycles/8 ms
• Package options:
    28-pin 400 mil plastic ZIP (ZIP28-P-400-1.27) (Product : MSM514262-xxZS)
    28-pin 400 mil plastic SOJ (SOJ28-P-400-1.27) (Product : MSM514262-xxJS)
                                                                                xx indicates speed rank.