HM624256A Datasheet | Hitachi Semiconductor

Description The Hitachi HM624256A is a high speed 1M Static RAM organized as 262,144-word × 4-bit. It realizes high speed access time (20/25/35 ns) and low power consumption, employing CMOS process technology and high speed circuit designing technology. It is most advantageous for the field where high speed and high density memory is required, such as the cache memory for main frame or 32-bit MPU. The HM624256A, packaged in a 400-mil plastic SOJ is available for high density mounting. Features - Single 5 V supply and high density 28-pin package (DIP and SOJ) - High speed Access time: 20/25/35 ns (max) - Low power dissipation Active mode: 350 m W (typ) Standby mode: 100 µW (typ) - pletely static memory No clock or timing strobe required - Equal access and cycle time - Directly TTL patible All inputs and outputs HM624256A Series Ordering Information Type No. Access Time Package HM624256AP-20 HM624256AP-25 HM624256AP-35 20 ns 25 ns 35 ns 400 mil 28-pin plastic DIP (DP-28C) HM624256ALP-20 20 ns HM624256ALP-25 25 ns HM624256ALP-35 35 ns HM624256AJP-20 HM624256AJP-25 HM624256AJP-35 20 ns 25 ns 35 ns 400 mil 28-pin plastic SOJ (CP-28D) HM624256ALJP-20 20 ns HM624256ALJP-25 25 ns HM624256ALJP-35 35 ns Pin Arrangement HM624256A Series A0 1 A1 2 A2 3 A3 4 A4 5 A5 6 A6 7 A7 8 A8 9 A9 10 A10 11 CS 12 OE 13 VSS 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 (Top view) VCC A17 A16 A15 A14 A13 A12 A11 NC I/O 1 I/O 2 I/O 3 I/O 4 WE Pin Description Pin Name A0 - A17 I/O1 - I/O4 CS OE WE VCC VSS Function Address Input/output Chip select Output enable Write enable Power supply Ground HM624256A Series Block...