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Description

The HM5264165F is a 64-Mbit SDRAM organized as 1048576-word × 16-bit × 4 bank. The HM5264805F is a 64-Mbit SDRAM organized as 2097152-word × 8-bit × 4 bank. The HM5264405F is a 64-Mbit SDRAM organized as 4194304-word × 4-bit × 4 bank. All inputs and outputs are referred to the rising edge of the clock input. It is packaged in standard 54-pin plastic TSOP II.

Features

? 3.3 V power supply

? Clock frequency: 133 MHz/100 MHz (max)

? LVTTL interface

? Single pulsed RAS

? 4 banks can operate simultaneously and independently

? Burst read/write operation and burst read/single write operation capability

? Programmable burst length: 1/2/4/8/full page

? 2 variations of burst sequence

?- Sequential (BL = 1/2/4/8/full page)

?- Interleave (BL = 1/2/4/8)

? Programmable CAS latency: 2/3

? Byte control by DQM:DQM (HM5264805F/HM5264405F) DQMU/DQML (HM5264165F)

? Refresh cycles: 4096 refresh cycles/64 ms

? 2 variations of refresh

?- Auto refresh

?- Self refresh

? Full page burst length capability

?- Sequential burst

?- Burst stop capability