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UL634H256SA35G1 Datasheet(PDF) 8 Page - Simtek Corporation |
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UL634H256SA35G1 Datasheet(HTML) 8 Page - Simtek Corporation |
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8 / 15 page  UL634H256 8 August 15, 2006 STK Control #ML0058 Rev 1.1 PowerStore and Automatic Power Up RECALL Hardware Controlled STORE DQi Output Previous Data Valid HSB ten(H)S td(H)S Data Valid tdis(H)S p: tPDSTORE approximate td(E)S or td(H)S; tDELAY approximate tdis(H)S. q: After tw(H)S HSB is hold down internal by STORE operation. r: An automatic RECALL also takes place at power up, starting when VCC exceeds VSWITCH and takes tRESTORE. VCC must not drop below VSWITCH once it has been exceeded for the RECALL to function properly. s: Once the software controlled STORE or RECALL cycle is initiated, it completes automatically, ignoring all inputs. t: Noise on the E pin may trigger multiple READ cycles from the same address and abort the address sequence. No. Software Controlled STORE/ RECALL Cycle Symbol 35 45 Unit Alt. IEC Min. Max. Min. Max. 29 STORE/RECALL Initiation Time tAVAV tcR 35 45 ns 30 Chip Enable to Output Inactives tELQZ tdis(E)SR 600 600 ns 31 STORE Cycle Time tELQXS td(E)S 10 10 ms 32 RECALL Cycle Timer tELQXR td(E)R 20 20 μs 33 Address Setup to Chip Enablet tAVELN tsu(A)SR 00 ns 34 Chip Enable Pulse Widths, t tELEHN tw(E)SR 25 30 ns 35 Chip Disable to Address Changet tEHAXN th(A)SR 00 ns tw(H)Sq (28) (26) (27) (25) High Impedance VCAP 3.0 V t PowerStore Power Up VSWITCH W DQi POWER UP RECALL BROWN OUT tRESTORE tRESTORE BROWN OUT PowerStore (NO SRAM WRITES) RECALL (24) (24) NO STORE tPDSTOREp tDELAYp |
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