'1GB' related articles 1

  1. 2008/06/30 EBE10RD4AJFA - 1GB Registered DDR2 SDRAM DIMM

* Density: 1GB
* Organization
- 128M words × 72 bits, 1 rank
* Mounting 18 pieces of 512M bits DDR2 SDRAM sealed in FBGA
* Package: 240-pin socket type dual in line memory module (DIMM)
- PCB height: 30.0mm
- Lead pitch: 1.0mm
- Lead-free (RoHS compliant)
* Power supply: VDD = 1.8V ± 0.1V
* Data rate: 667Mbps/533Mbps/400Mbps (max.)
* Four internal banks for concurrent operation (components)
* Interface: SSTL_18
* Burst lengths (BL): 4, 8
* /CAS Latency (CL): 3, 4, 5
* Precharge: auto precharge option for each burst access
* Refresh: auto-refresh, self-refresh
* Refresh cycles: 8192 cycles/64ms
- Average refresh period
7.8μs at 0°C ≤ TC ≤ +85°C
3.9μs at +85°C < TC ≤ +95°C
* Operating case temperature range
- TC = 0°C to +95°C

* Double-data-rate architecture; two data transfers per clock cycle
* The high-speed data transfer is realized by the 4 bits prefetch pipelined architecture
* Bi-directional differential data strobe (DQS and /DQS) is transmitted/received with data for capturing data at the receiver
* DQS is edge-aligned with data for READs; centeraligned with data for WRITEs
* Differential clock inputs (CK and /CK)
* DLL aligns DQ and DQS transitions with CK transitions
* Commands entered on each positive CK edge; data referenced to both edges of DQS
* Posted /CAS by programmable additive latency for better command and data bus efficiency
* Off-Chip-Driver Impedance Adjustment and On-Die- Termination for better signal quality
* /DQS can be disabled for single-ended Data Strobe operation
* 1 piece of PLL clock driver, 2 pieces of register driver and 1 piece of serial EEPROM (2K bits EEPROM) for Presence Detect (PD)


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