поискавой системы для электроныых деталей |
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CXK77K18R320GB-4 датащи(PDF) 4 Page - Sony Corporation |
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CXK77K18R320GB-4 датащи(HTML) 4 Page - Sony Corporation |
4 / 23 page SONY® CXK77K18R320GB Preliminary 32Mb LW R-R, rev 0.8 4 / 23 December 8, 2004 •Clock Truth Table Notes: 1. “1” = input “high”; “0” = input “low”; “X” = input “don’t care”. 2. “***” indicates that the input requirement or output state is determined by the previous operation. 3. DQs are tri-stated in response to Write and Deselect commands, one cycle after the command is sampled. •Sleep (Power Down) Mode Sleep (power down) mode is provided through the asynchronous input signal ZZ. When ZZ is asserted (high), the output drivers are disabled and the SRAM begins to draw standby current. Contents of the memory array are preserved. An enable time (tZZE) must be met before the SRAM is guaranteed to be in sleep mode, and a recovery time (tZZR) must be met before the SRAM can resume normal operation. •Programmable Impedance Output Drivers These devices have programmable impedance output drivers. The output impedance is controlled by an external resistor RQ connected between the SRAM’s ZQ pin and VSS, and is equal to one-fifth the value of this resistor, nominally. See the DC Electrical Characteristics section for further information. Output Driver Impedance Power-Up Requirements Output driver impedance will reach the programmed value within 8192 cycles after power-up. Consequently, it is recom- mended that Read operations not be initiated until after the initial 8192 cycles have elapsed. Output Driver Impedance Updates Output driver impedance is updated during Write and Deselect operations when the output driver is disabled. •Power-Up Sequence For reliability purposes, Sony recommends that power supplies power up in the following sequence: VSS, VDD, VDDQ, VREF, and Inputs. VDDQ should never exceed VDD. If this power supply sequence cannot be met, a large bypass diode may be re- quired between VDD and VDDQ. Please contact Sony Memory Application Department for further information. KZZ SS (tn) SW (tn) SBWx (tn) G Operation DQ (tn) DQ (tn+1) X 1 X X X X Sleep (Power Down) Mode Hi - Z Hi - Z ↑ 0 1 X X X Deselect *** Hi - Z ↑ 001 X 1 Read Hi - Z Hi - Z ↑ 001 X 0 Read *** Q(tn) ↑ 0 0 0 0 X Write All Bytes *** D(tn) ↑ 0 0 0 X X Write Bytes With SBWx = 0 *** D(tn) ↑ 0 0 0 1 X Abort Write *** Hi - Z |
Аналогичный номер детали - CXK77K18R320GB-4 |
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Аналогичное описание - CXK77K18R320GB-4 |
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