256MB A-Data DDR PC3200 400MHz CL2.5 module (8 chips) by Adata

256Mb 400MHz DDR RAM memory module, DDR400 PC3200 rating. 184 pins, non-ECC, 2.5V, suitable for the majority of desktop computers designed for 400MHz memory. Single-sided with 8 chips, rated CL2.5-3-3. Lifetime warranty.

This module uses 32Mx8 chips (8 chips per module) which makes them very compatible with the widest possible range of systems.

The DDR400 module for desktop is a double data rate module composed of CMOS Double Data Rate SDRAMs in TSOP-II 400mil 66pin package and one 2Kbit EEPROM in 8pin TSSOP(TSOP) package on a 184pin glass–epoxy printed circuit board.

DDR400 is a dual in-line memory module and is intended for mounting onto 184-pins edge connector sockets. Synchronous design allows precise cycle control with the use of system clock. Data I/O transactions are possible on both edges of DQS. Range of operating frequencies, programmable latencies and burst lengths allow the same device to be useful for a variety of high bandwidth, high performance memory system applications.

Features:

- DLL aligns DQ and DQS transition with CK transition
- Double-data-rate architecture
- Bi-directional data strobe (DQS)
- Differential clock inputs(CK and /CK)
- Auto refresh and self refresh
- 8192 refresh cycles / 64ms
- Power supply: VDD, VDDQ: 2.7V+/-0.1V
- Programmable Burst length (2,4,8)
- Serial Presence Detect with EEPROM