HM62W16258B Datasheet | Hitachi Semiconductor

HM62W16258B Series 4 M SRAM (256-kword × 16-bit) ADE-203-976B (Z) Rev. 2.0 Oct. 14, 1999 Description The Hitachi HM62W16258B Series is 4-Mbit static RAM organized 262,144-word × 16-bit. HM62W16258B Series has realized higher density, higher performance and low power consumption by employing Hi-CMOS process technology. It offers low power standby power dissipation; therefore, it is suitable for battery backup systems. It is packaged in standard 44-pin plastic TSOPII. Features - - - Single 3.3 V supply: 3.3 V ± 0.3 V Fast access time: 55 ns/70 ns (max) Power dissipation:  Active: 9.9 m W (typ)  Standby: 3.3 µW (typ) pletely static memory.  No clock or timing strobe required Equal access and cycle times mon data input and output.  Three state output Battery backup operation. - - - - HM62W16258B Series Ordering Information Type No. HM62W16258BLTT-5 HM62W16258BLTT-7 HM62W16258BLTT-5SL HM62W16258BLTT-7SL Access time 55 ns 70 ns 55 ns 70 ns Package 400-mil 44-pin plastic TSOPII (normal-bend type) (TTP-44DB) HM62W16258B Series Pin Arrangement 44-pin TSOP A4 A3 A2 A1 A0 CS I/O0 I/O1 I/O2 I/O3 VCC VSS I/O4 I/O5 I/O6 I/O7 WE A17 A16 A15 A14 A13 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 (Top view) 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 A5 A6 A7 OE UB LB I/O15 I/O14 I/O13 I/O12 VSS VCC I/O11 I/O10 I/O9 I/O8 NC A8 A9 A10 A11 A12 Pin Description Pin name A0 to A17 I/O0 to I/O15 CS WE OE LB UB VCC VSS NC Function Address input Data input/output Chip select Write enable Output enable Lower byte select Upper byte select Power supply Ground No connection HM62W16258B Series Block Diagram LSB V CC V SS - - - - - A4 A3 A15 A14 A16 A1 A2 A17 A0 A13 Row decoder Memory matrix 2,048 x 2,048 I/O0 Input data control I/O15 - - Column I/O Column decoder - - LSB A7 A6A5 A8 A9A10A11...