MSM54C865 Datasheet | OKI Electric

DESCRIPTION The MSM54C865 is a 512Kbit CMOS multiport DRAM posed of a 65,536-word by 8-bit dynamic RAM and a 256-word by 8-bit SAM. Its RAM and SAM operate independently and asynchronously. The MSM54C865 supports three types of operaton: 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 MSM54C865 features the 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: 5 V ± 10% - Full TTL patibility - Multiport organization RAM : 64K word - 8 bits SAM : 256 word - 8 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 - 256 tap location - Bidirectional data transfer - Split transfer - Masked write transfer - Refresh :256 cycles/4 ms - Package options: 40-pin 475 mil plastic ZIP (ZIP40-P-475-1.27) 40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27) (Product : MSM54C865-xx ZS) (Product : MSM54C865-xx JS) xx indicates speed rank. PRODUCT FAMILY Family MSM54C865-70 MSM54C865-80 MSM54C865-10 Access Time RAM 70 ns 80 ns 100 ns SAM 25 ns 25 ns 25 ns Cycle Time RAM 140 ns 150 ns 180 ns SAM 30 ns 30 ns 30 ns Power Dissipation Operating 120 m A 110 m A 100 m A Standby 8 m A 8 m A 8 m A 1/44 .. ¡ Semiconductor PIN CONFIGURATION (TOP VIEW) W5/IO5 W7/IO7 SE SIO6 SIO8 1 3 5 7 9 SC 1 2 4 6 8 W6/IO6 W8/IO8 SIO5 SIO7 SIO1 2 SIO2 3 SIO3 4 SIO4 5 DT/OE 6 W1/IO1 7 W2/IO2 8 W3/IO3 9 W4/IO4 10 VCC1 11 WB/WE 12 NC 13 RAS 14 NC 15 NC 16 A6 17 A5 18 A4 19 VCC2 20 SC 11 SIO2 13 SIO4 15 W1/IO1 17 W3/IO3 19 W4/IO4 21 WB/WE 23 NC 25 VSS2 27 A5 29 NC 31 A7 33 A2 35 A0 37 CAS 39 10 VSS1 12 SIO1 14 SIO3 16 DT/OE 18 W2/IO2 20 VSS3 22 VCC1 24 RAS 26 A6...