DESCRIPTION

The MSM54V16282 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 MSM54V16282 features 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: 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 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 : MSM54V16282-xxGS-K)

70/64-pin 400 mil plastic TSOP (Type II)(TSOPII70/64-P-400-0.65-K)(Product : MSM54V16282-xxTS-K)

xx indicates speed rank.