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MSM514262-70JS Datasheet(PDF) 1 Page - OKI electronic componets |
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MSM514262-70JS Datasheet(HTML) 1 Page - OKI electronic componets |
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1 / 45 page  ¡ Semiconductor MSM514262 1/45 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. The MSM514262 supports three types of operation : 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 MSM514262 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 compatibility • Multiport organization RAM: 256K word ¥ 4 bits SAM: 512 word ¥ 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. PRODUCT FAMILY ¡ Semiconductor MSM514262 262,144-Word ¥ 4-Bit Multiport DRAM MSM514262-70 MSM514262-80 MSM514262-10 Access Time RAM SAM 70 ns 25 ns 80 ns 25 ns 100 ns 25 ns Cycle Time RAM SAM 140 ns 30 ns 150 ns 30 ns 180 ns 30 ns Power Dissipation Operating 120 mA 110 mA 100 mA Standby 8 mA 8 mA 8 mA Family E2L0013-17-Y1 This version: Jan. 1998 Previous version: Dec. 1996 |
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