HY534256 series

The HY534256 series is the new generation and fast dynamic RAM organized 262,144 x 4-bits. It utilizes Hyundai's CMOS silicon gate process technology as well as advanced circuit techniques to provide wide operating margins to the users. Multiplexed address inputs permit the Hy534256 to be packaged in a standard 300 mil 20 pin PDIP and 20/26 pin SQJ. the package size provides high system bit densities and is compatible with widely available automated testing and insertion equipments.System oriented feature includes single power supply of 5V±10% tolerance and direct interfacing capability with high peformance logic families such as TTL.

HY534256 series has many unique features: the first one is low power dissipation. The second one is single power suply 5V±10%. The third one is TTL compatible inputs and outputs. The forth one is fast access time.The fifth one is read-modify-write capability. The sixth one is CAS-before-RAS,RAS-only, Hidden refresh.The last one is 512 refresh cycles/8ms.There are some absolute maximum ratings about it.Ambient temperature(Ta) is 0 to 70.Storage temperature(Tstg) is -55 to 150.Voltage on any pin relative to Vss(Vin,Vout) is -1.0 V to 7.0 V. Voltage on Vcc relative to Vss(Vcc) is -1.0 V to 7.0 V. Short circuit output current(Ios) is 50 mA.Power dissipation(PD) is 0.60 W.Soldering temperature.time(Tsolder) is 260*10.sec.Otherwise, there are also some recommended DC operating conditions:Supply voltage(Vcc) is 4.5 Vmin,5.0 V typ and 5.5 V max. Input high voltage(VIH) is 2.4 V min and Vcc+1.0 V max. Input low voltage(VIL) is -1.0 V min and 0.8 V max.

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