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AS4C256K16FO-50JI Datasheet(PDF) 2 Page - Alliance Semiconductor Corporation |
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AS4C256K16FO-50JI Datasheet(HTML) 2 Page - Alliance Semiconductor Corporation |
2 / 25 page ® AS4C256K16FO 4/11/01; V.0.9.1 Alliance Semiconductor P. 2 of 25 Functional description The AS4C256K16FO is a high-performance 4 megabit CMOS Dynamic Random Access Memory (DRAM) device organized as 262,144 words × 16 bits. The AS4C256K16FO is fabricated with advanced CMOS technology and designed with innovative design techniques resulting in high speed, extremely low power and wide operating margins at component and system levels. The AS4C256K16FO features a high-speed page mode operation in which high speed read, write and read-write are performed on any of the 512 × 16 bits defined by the column address. The asynchronous column address uses an extremely short row address capture time to ease the system-level timing constraints associated with multiplexed addressing. Output is tri-stated by a column address strobe (CAS) which acts as an output enable independent of RAS. Very fast CAS to output access time eases system design. Refresh on the 512 address combinations of A0–A8 during an 8 ms period is accomplished by performing any of the following: •RAS-only refresh cycles • Hidden refresh cycles •CAS-before-RAS refresh cycles • Normal read or write cycles • Self-refresh cycles.* The AS4C256K16FO is available in standard 40-pin plastic SOJ and 44-pin TSOP II packages compatible with widely available automated testing and insertion equipment. System level features include single power supply of 5V ± 10% tolerance and direct interface with TTL logic families. Logic block diagram Recommended operating conditions * Self-refresh option is available for new generation device only. Contact Alliance for more information. Parameter Symbol Min Typ Max Unit Supply voltage VCC 4.5 5.0 5.5 V GND 0.0 0.0 0.0 V Input voltage VIH 2.4 – VCC + 1 V VIL –1.0 – 0.8 V 512 ×512×16 array (4,194,304) Sense amp A0 A1 A2 A3 A4 A5 A6 A7 VCC GND A8 Column decoder OE RAS UCAS WE LCAS I/O0 to I/O15 Substrate bias generator Data I/O buffer RAS clock generator CAS clock generator WE clock generator |
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