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AS4SD4M16 Datasheet(PDF) 5 Page - Austin Semiconductor |
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AS4SD4M16 Datasheet(HTML) 5 Page - Austin Semiconductor |
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5 / 50 page  SDRAM AS4SD4M16 Austin Semiconductor, Inc. AS4SD4M16 Rev. 1.5 10/01 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 5 PIN DESCRIPTION TSOP PIN NUMBERS 38 CLK Input Clock: CLK is driven by the system clock. All SDRAM input signals are sampled on the positive edge of CLK. CLK also increments the internal burst counter and controls the output registers. 37 CKE Input Clock Enable: CKE activates (HIGH) and deactivates (LOW) the CLK signal. Deactivating the clock provides PRECHARGE POWER-DOWN and SELF REFRESH operations (all banks idle), ACTIVE POWER-DOWN (row ACTIVE in either bank) or CLOCK SUSPEND operation (burst/access in progress). CKE is synchronous except after the device enters power-down and self refresh modes, where CKE becomes asynchronous until after exiting the same mode. The input buffers, including CLK, are disabled during power-down and self refresh modes, providing low standby power. CKE may be tied HIGH. 19 CS\ Input Chip Select: CS\ enables (registered LOW) and disables (registered HIGH) the command decoder. All commands are masked when CS\ is registered HIGH. CS\ provides for external bank selection on systems with multiple banks. CS\ is considered part of the command code. 16, 17 WE\, CAS\ Input Command Inputs: RAS\, CAS\, and WE\ (along with CS\) define the 18 RAS\ command being entered. 15, 39 DQML, Input Input/Output Mask: DQM is an input mask signal for write accesses and an DQMH output enable signal for read accesses. Input data is masked when DQM is sampled HIGH during a WRITE cycle. The output buffers are placed in a High-Z state (two-clock latency) when DQM is sampled HIGH during a READ cycle. DQML corresponds to DQ0-DQ7; DQMH corresponds to DQ8-DQ15. DQML and DQMH are considered same state when referenced as DQM. 20, 21 BA0, BA1 Input Bank Address Inputs: BA0 and BA1 define to which bank the ACTIVE, READ, WRITE or PRECHARGE command is being applied. 23-26, 29-34, A0-A11 Input Address Inputs: A0-A11 are sampled during the ACTIVE command (row 22, 35 address A0-A11) and READ/WRITE command (column address A0-A7, with A10 defining AUTO PRECHARGE) to select one location out of the memory array in the respective bank. A10 is sampled during a PRECHARGE command to determine if all banks are to be precharged (A10 HIGH) or bank selected by BA0,BA1 (LOW). The address inputs also provide the op-code during a LOAD MODE REGISTER command. 2, 4, 5, 7, 8 DQ0- DQ15 Input/ Data I/O: Data bus. 10, 11, 13, 42 Output 44, 45, 47, 48 50, 51, 53 36, 40 NC — No Connect: These pins should be left unconnected. 3, 9, 43, 49 VDDQ Supply DQ Power: Provide isolated power to DQs for improved noise immunity. 6, 12, 46, 52 VSSQ Supply DQ Ground: Provide isolated ground to DQs for improved noise immunity. 1, 14, 27 VDD Supply Power Supply: +3.3V ±0.3V. 28, 41, 54 VSS Supply Ground. SYMBOL TYPE DESCRIPTION |
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