Rainbow-electronics DS1248Y Bedienungsanleitung

Copyright 1997 by Dallas Semiconductor Corporation.All Rights Reserved. For important information regardingpatents and other intellectual property r

DS1248Y032697 10/12WRITE CYCLE TO PHANTOM CLOCKDATA IN STABLEtWCtWPtWRtCWtWRtDStDHtDHWECEDOE = VIHPOWER–DOWN/POWER–UP CONDITIONDATA RETENTION TIMEtDRL

DS1248Y032697 11/12NOTES:1. WE is high for a read cycle.2. OE = VIH or VIL. If OE = VIH during write cycle, the output buffers remain in a high imped

DS1248Y032697 12/12DS1248Y 1024K NV SRAM WITH PHANTOM CLOCKA1CFGKDHBEJDIM32–PINMINPKGMAXA IN. 1.720 1.740MM 43.69 44.20B IN. 0.720 0.740MM 18.29 18.

DS1248Y032697 2/12RAM READ MODEThe DS1248Y executes a read cycle whenever WE(Write Enable) is inactive (high) and CE (Chip Enable) isactive (low). Th

DS1248Y032697 3/12PHANTOM CLOCKREGISTER INFORMATIONThe Phantom Clock information is contained in 8 regis-ters of 8 bits, each of which is sequentially

DS1248Y032697 4/12PHANTOM CLOCK REGISTER DEFINITION Figure 27654 32100.1 SEC00–9900–5900–5901–1201–0701–3101–1200–9901234567RANGE(BCD)REGISTER0012/24

DS1248Y032697 5/12ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground –0.3V to +7.0VOperating Temperature 0°C to 70°CStorage Temperature –4

DS1248Y032697 6/12MEMORY AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5.0V ± 10%)PARAMETERSYMBOLDS1248Y–120DS1248Y–150 DS1248Y–200UNITSNOTESPAR

DS1248Y032697 7/12PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 4.5 to 5.5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESRead Cycle Time

DS1248Y032697 8/12MEMORY READ CYCLE (NOTE 1)tRCtACCtCOtOEtCOEtCOEtOHtODtODOUTPUTDATA VALIDVILVIHVILVIHVILVIHVIHVILVIHVIHVIHVILVOLVOHVOLVOHADDRESSESCE

DS1248Y032697 9/12MEMORY WRITE CYCLE 2 (NOTES 2 AND 8)tWCVILVIHVILVIHVILVIHVILCEVILVILVIHVILVIHDATA INSTABLEtWPtCOEtOEWtDHtDSWEADDRESSESDQ0–DQ7tAWVIHV