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Features Pin Identification

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SDRAM Unbuffered DIMM SDRAM Unbuffered DIMM is high-speed, low power memory module that use SDRAM and a 2048 bits serial EEPROM on a 168-pin printed circuit board. SDRAM Unbuffered DIMM is a 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 operation frequencies, programmable latencies allow the same device to be useful for a variety of high bandwidth, high performance memory system applications. Features  RoHS compliant products.  Single 3.3V±0.3V power supply.  Performance Range:PC-100, CL2 PC-133, CL3 Pin Identification Symbol A0~A12 BA0~BA1 DQ0~DQ63 Function Address /Select Bank input Bi-direction data bus.  MRS cycle with address key programs. CLK0~CLK3 Clock Input  Latency(Access from column address) CKE0,CKE1 Clock Enable Input.  Burst Length(1,2,4,8 & Full Page) /CS0~/CS3 Chip select Input.  Data Sequence(Sequential & Interleave)  Burst Mode Operation  Auto and Self Refresh.  All inputs are sampled at the positive going   /RAS Row address strobe /CAS Column address strobe /WE Write Enable DQM0~DQM7 Data masks VCC +3.3V Power supply edge of the system clock. SCL Clock for EEPROM LVTTL compatible inputs and outputs. SDA Data for EEPROM Serial presence detect with EEPROM SA0~SA2 Address in EEPROM VSS Ground NC No Connection Dimensions Side Placement Millimeters Inches A 133.350.20 5.2500.008 B 65.67 2.585 C 23.49 0.925 D 8.89 0.350 E 3.00 0.118 F* 22.2~31.750.20 0.875~1.250.008 G 19.80 0.788 H 15.80 0.622 I 1.270.10 0.0500.004 A Note: 1. Tolerances on all dimensions +/-0.15mm unless otherwise specified 2. Dimension F is base on different types of PCB. B D E C E H G F I Pin Assignments