MSM548262 Datasheet | OKI Electric

DESCRIPTION The MSM548262 is a 2-Mbit CMOS multiport DRAM posed of a 262,144-word by 8-bit dynamic RAM, and a 512-word by 8-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 MSM548262 features block write, 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 flipflops. FEATURES - RAS only refresh - Single power supply: 5 V ± 10% - CAS before RAS refresh - Full TTL patibility - Hidden refresh - Multiport organization - Serial read/write RAM : 256K word - 8 bits - 512 tap location SAM : 512 word - 8 bits - Bidirectional data transfer - Fast page mode - Split transfer - Write per bit - Masked write transfer - Masked flash write - Refresh: 512 cycles/8 ms - Masked block write - Package options: 40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27) (Product : MSM548262-xx JS) 44/40-pin 400 mil plastic TSOP (Type II)(TSOPII44/40-P-400-0.80-K)(Product : MSM548262-xx TS-K) xx indicates speed rank. PRODUCT FAMILY Family MSM548262-60 MSM548262-70 MSM548262-80 Access Time RAM 60 ns 70 ns 80 ns SAM 17 ns 17 ns 20 ns Cycle Time RAM 120 ns 140 ns 150 ns SAM 22 ns 22 ns 25 ns Power Dissipation Operating 140 m A 130 m A 120 m A Standby 8 m A 8 m A 8 m A 1/37 .. ¡ Semiconductor PIN CONFIGURATION (TOP VIEW) VCC SC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 SDQ8 SDQ7 SDQ6 SDQ5 SE DQ8 DQ7 DQ6 DQ5 VSS DSF NC CAS QSF A0 A1 A2 A3 VSS SDQ1 SDQ2 SDQ3 SDQ4 TRG DQ1 DQ2 DQ3 DQ4 VSS WE RAS A8 A7 A6 A5 A4 VCC 38 37 36 35 34 33 32 31 VCC SC SDQ1 SDQ2 SDQ3 SDQ4 TRG DQ1 DQ2 DQ3 1 2 3 4 5 6 7 8 9 10 44 43 42 41 40 39 38 37 36 35 VSS SDQ8 SDQ7 SDQ6 SDQ5 SE DQ8 DQ7 DQ6 DQ5 30 29 28...