HYS72D256320GBR-6-B

Attention: Permanent damage to the device may occur if "Absolute Maximum Ratings" are exceeded. This
is a stress rating only, and functional operation should be restricted to recommended operation
conditions. Exposure to absolute maximum rating conditions for extended periods of time may
affect device reliability and exceeding only one of the values may cause irreversible damage to
the integrated circuit.

The HYS72D256320GBR-6-B are low profile versions of the standard Registered DIMM modules with 1.1" inch (28.58) and 1.2" inch (30,40 mm) height for 1U Server Applications. The Low Profile DIMM versions are available as 128M * 72 (1 GB) and 256M * 72 (2 GB).

The memory array of the HYS72D256320GBR-6-B is designed with Double Data Rate Synchronous DRAMs for ECC applications. All control and address signals are re-driven on the DIMM using register devices and a PLL for the clock distribution. This reduces capacitive loading to the system bus, but adds one cycle to the SDRAM timing. A variety of decoupling capacitors of the HYS72D256320GBR-6-B are mounted on the PC board. The DIMMs feature serial presence detect based on a serial E2PROM device using the 2-pin I2C protocol. The first 128 bytes are programmed with configuration data and the second 128 bytes are available to the customer.