描述 Description

The Hitachi HM514400B/BL, HM514400C/CL are CMOS dynamic RAM organized 1,048,576-word × 4-bit. HM514400B/BL, HM514400C/CL have realized higher density, higher performance and various functions by employing 0.8 μm CMOS process technology and some new CMOS circuit design technologies. The HM514400B/BL, HM514400C/CL offer Fast Page Mode as a high speed access mode. Multiplexed address input permits the HM514400B/BL, HM514400C/CL to be packaged in standard 300-mil 26-pin plastic SOJ, standard 400-mil 20-pin plastic ZIP and 26-pin plastic TSOP II.

特性 Features

? Single 5 V (±10%)
? High speed
?? — Access time
????? 60 ns/70 ns/80 ns (max)
? Low power dissipation
?? — Active mode
????? 605 mW/550 mW/495 mW (max)
?? — Standby mode 11 mW (max)
????? 0.55 mW (max) (L-version)
? Fast page mode capability
? 1024 refresh cycles : 16 ms
?? 1024 refresh cycles : 128 ms (L-version)
? 3 variations of refresh
?? — RAS-only refresh
?? — CAS-before-RAS refresh
?? — Hidden refresh
? Test function
? Battery back up operation
?? — HM514400BL Series (L-version)
?? — HM514400CL Series (L-version)?