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M393T5750CZ3-CCC Datasheet(PDF) 4 Page - Samsung semiconductor |
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M393T5750CZ3-CCC Datasheet(HTML) 4 Page - Samsung semiconductor |
4 / 21 page Rev. 1.2 Aug. 2005 512MB, 1GB, 2GB Registered DIMMs DDR2 SDRAM Input/Output Functional Description Symbol Type Function CK0 Input Positive line of the differential pair of system clock inputs that drives input to the on-DIMM PLL. CK0 Input Negative line of the differential pair of system clock inputs that drives the input to the on-DIMM PLL. CKE0~CKE1 Input Activates the SDRAM CK signal when high and deactivates the CK signal when low. By deactivating the clocks, CKE low initiates the Power Down mode, or the Self Refresh mode. S0~S1 Input Enables the associated SDRAM command decoder when low and disables decoder when high. When decoder is disabled, new commands are ignored but previous operations continue. These input signals also disable all outputs (except CKE and ODT) of the register(s) on the DIMM when both inputs are high. ODT0~ODT1 Input I/O bus impedance control signals. RAS, CAS, WE Input When sampled at the positive rising edge of the clock, CAS, RAS, and WE define the operation to be executed by the SDRAM. VREF Supply Reference voltage for SSTL_18 inputs VDDQ Supply Isolated power supply for the DDR SDRAM output buffers to provide improved noise immunity BA0~BA1 Input Selects which SDRAM bank of four is activated. A0~A9,A10/AP A11~A13 Input During a Bank Activate command cycle, Address defines the row address. During a Read or Write command cycle, Address defines the column address. In addition to the column address, AP is used to invoke autoprecharge operation at the end of the burst read or write cycle. If AP is high, autoprecharge is selected and BA0, BA1 defines the bank to be precharged. If AP is low, autoprecharge is disabled. During a Precharge command cycle, AP is used in conjunction with BA0, BA1 to control which bank(s) to precharge. If AP is high, all banks will be pre- charged regardless of the state of BA0 or BA1. If AP is low, BA0 and BA1 are used to define which bank to precharge. DQ0~63, CB0~CB7 In/Out Data and Check Bit Input/Output pins DM0~DM8 Input Masks write data when high, issued concurrently with input data. Both DM and DQ have a write latency of one clock once the write command is registered into the SDRAM. VDD, VSS Supply Power and ground for the DDR SDRAM input buffers and core logic DQS0~DQS17 In/Out Positive line of the differential data strobe for input and output data. DQS0~DQS17 In/Out Negative line of the differential data strobe for input and output data. SA0~SA2 Input These signals are tied at the system planar to either VSS or VDDSPD to configure the serial SPD EEPROM address range. SDA In/Out This bidirectional pin is used to transfer data into or out of the SPD EEPROM. A resistor must be connected from the SDA bus line to VDDSPD to act as a pullup. SCL Input This signal is used to clock data into and out of the SPD EEPROM. A resistor may be connected from the SCL bus time to VDDSPD to act as a pullup. VDDSPD Supply Serial EEPROM positive power supply (wired to a separate power pin at the connector which supports from 1.7 Volt to 3.6 Volt operation). RESET Input The RESET pin is connected to the RST pin on the register and to the OE pin on the PLL. When low, all register outputs will be driven low and the PLL clocks to the DRAMs and register(s) will be set to low level (The PLL will remain synchro- nized with the input clock ) Par_In Input Parity bit for the Address and Control bus. ( “1 “ : Odd, “0 “ : Even) Err_Out Input Parity error found in the Address and Control bus TEST In/Out Used by memory bus analysis tools (unused on memory DIMMs) |
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