DRAM

DRAM module 4Mbyte(1Mx32) fast page mode, 1K refresh, 72-pin SIMM, 5V Design

General description

The HMD1M32M2 is an 1M x 32 bits dynamic RAM module which is assembled 2 pieces of 1M x 16bit DRAMs in 42 pin SOJ package on single sides the printed circuit board with decoupling capacitors. The HMD1M32M2G is optimized for application to the systems, which are required high density and large capacity such as main memory of the computers and an image memory systems, and to the others, which are, requested compact size.

Features

• Part identification
  HMD1M32M2: solder plate Lead
  HMD1M32M2G: gold plate Lead
• Access times: 50ns, 60ns, 70ns
• High-density 4MByte design
• Single +5V ±0.5V power supply
• JEDEC standard pinout
• Fast page mode capability
• TTL compatible inputs and outputs
• FR4-PCB design
• 72 pins single In-Line package
• Low power
• Active: 1,870/1,650/1,430 mW (MAX)
  Standby: 11mW (CMOS level : MAX)
• RAS Only refresh, CAS before RAS refresh, Hidden refresh capability
• All inputs and outputs TTL compatible
• 1,024 refresh cycles/16ms
• Timing
  50ns access: -5
  60ns access: -6
  70ns access: -7
• Packages
  72-pin SIMM: M