MSM548263 Datasheet | OKI Electric

DESCRIPTION The MSM548263 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 MSM548263 features block write, flash write functions and extended page mode on the RAM port and a split data transfer capability, 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 patibility - CAS before RAS refresh - Multiport organization - Hidden refresh RAM : 256K word - 8 bits - Serial read/write SAM : 512 word - 8 bits - 512 tap location - Extended page mode - Programmable stops - Write per bit - Bidirectional data transfer - Persistent write per bit - Split transfer - Masked flash write - Masked write transfer - Masked block write - Refresh: 512 cycles/8 ms - Package options: 40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27) (Product : MSM548263-xx JS) 44/40-pin 400 mil plastic TSOP (Type II)(TSOPII44/40-P-400-0.80-K)(Product : MSM548263-xx TS-K) xx indicates speed rank. PRODUCT FAMILY Family MSM548263-60 MSM548263-70 MSM548263-80 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 1/40 .. ¡ Semiconductor PIN CONFIGURATION (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 11 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 WE 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...