GENERAL DESCRIPTION

The HSD4M64D4B is a 4M x 64 bit Synchronous Dynamic RAM high density memory module. The module consists of four CMOS 1M x 16 bit with 4banks Synchronous DRAMs in TSOP-II 400mil packages on a 168-pin glass-epoxy substrate. Two 0.1uF decoupling capacitors are mounted on the printed circuit board in parallel for each SDRAM. The HSD4M64D4B is a DIMM(Dual in line Memory Module) and is intended for mounting into 168-pin edge connector sockets. Synchronous design allows precise cycle control with the use of system clock. I/O transactions are possible on every clock cycle. Range of operating frequencies, programmable latencies allows the same device to be useful for a variety of high bandwidth, high performance memory system applications All module components may be powered from a single 3.3V DC power supply and all inputs and outputs are LVTTL-compatible.

FEATURES

? Part Identification

HSD4M64D4B-10 : 100MHz ( CL=2)

HSD4M64D4B-10L : 100MHz ( CL=3)

HSD4M64D4B- 8 : 125MHz ( CL=3)

? Burst mode operation

? Auto & self refresh capability (4096 Cycles/64ms)

? LVTTL compatible inputs and outputs

? Single 3.3V ±0.3V power supply

? MRS cycle with address key programs

- Latency (Access from column address)

- Burst length (1, 2, 4, 8 & Full page)

- Data scramble (Sequential & Interleave)

? JEDEC standard

? All inputs are sampled at the positive going edge of the system clock

? The used device is 1Mx16Bitx4Banks SDRAM