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U634H256D1M25 Datasheet(PDF) 8 Page - Zentrum Mikroelektronik Dresden AG |
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U634H256D1M25 Datasheet(HTML) 8 Page - Zentrum Mikroelektronik Dresden AG |
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8 / 14 page  8 April 21, 2004 U634H256 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 No. Software Controlled STORE/RECALL Cycle Symbol 25 35 45 Unit Alt. IEC Min.Max. Min.Max. Min.Max. 29 STORE/RECALL Initiation Time tAVAV tcR 25 35 45 ns 30 Chip Enable to Output Inactives tELQZ tdis(E)SR 600 600 600 ns 31 STORE Cycle Time tELQXS td(E)S 10 10 10 ms 32 RECALL Cycle Timer tELQXR td(E)R 20 20 20 µs 33 Address Setup to Chip Enablet tAVELN tsu(A)SR 000 ns 34 Chip Enable Pulse Widths, t tELEHN tw(E)SR 20 25 30 ns 35 Chip Disable to Address Changet tEHAXN th(A)SR 000 ns tw(H)Sq (28) (26) (27) (25) High Impedance VCAP 5.0 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 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. |
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