Rainbow-electronics DS1244Y Manual do Utilizador

1 of 19 081902Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any

DS1244/DS1244P10 of 19PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICSOver the operating range (5V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESRead Cycle Time

DS1244/DS1244P11 of 19MEMORY AC ELECTRICAL CHARACTERISTICS Over the operating range (3.3V)DS1244W-120PARAMETER SYMBOLMIN MAXUNITS NOTESRead Cycle Time

DS1244/DS1244P12 of 19POWER-DOWN/POWER-UP TIMING Over the operating range (3.3V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE a

DS1244/DS1244P13 of 19MEMORY READ CYCLE (Note 1)MEMORY WRITE CYCLE 1 (Notes 2, 6, and 7)

DS1244/DS1244P14 of 19MEMORY WRITE CYCLE 2 (Notes 2 and 8)RESET FOR PHANTOM CLOCKREAD CYCLE TO PHANTOM CLOCK

DS1244/DS1244P15 of 19WRITE CYCLE TO PHANTOM CLOCK

DS1244/DS1244P16 of 19POWER-DOWN/POWER-UP CONDITION, 5VPOWER-DOWN/POWER-UP CONDITION, 3.3V

DS1244/DS1244P17 of 19AC TEST CONDITIONSOutput Load: 50pF + 1TTL GateInput Pulse Levels: 0 to 3VTiming Measurement Reference LevelsInput: 1.5VOutput:

DS1244/DS1244P18 of 19DS1244P WITH DS9034PCX ATTACHED COMPONENTS AND PLACEMENT MIGHT VARY FROM EACH DEVICE TYPEPKG INCHESDIM MIN NOM MAXA0.920 0.92

DS1244/DS1244P19 of 19RECOMMENDED POWERCAP MODULE LAND PATTERNNote: Dallas Semiconductor recommends that PowerCap module bases experience one pass thr

DS1244/DS1244P2 of 19PIN DESCRIPTIONA0–A14 - Address InputsCE - Chip EnableOE - Output EnableWE - Write EnableVCC- Power-Supply InputGND - Groun

DS1244/DS1244P3 of 19RAM READ MODEThe DS1244 executes a read cycle whenever WE (write enable) is inactive (high) and CE (chip enable)is active (low

DS1244/DS1244P4 of 19the CE and OE control of the phantom clock starts the pattern recognition sequence by moving a pointerto the first bit of the

DS1244/DS1244P5 of 19Figure 1. PHANTOM CLOCK REGISTER DEFINITIONNote: The pattern recognition in hex is C5, 3A, A3, 5C, C5, 3A, A3, 5C. The odds of th

DS1244/DS1244P6 of 19Figure 2. PHANTOM CLOCK REGISTER DEFINITIONAM/PM/12/24 MODEBit 7 of the hours register is defined as the 12-hour or 24-hour mode-

DS1244/DS1244P7 of 19BATTERY LONGEVITYThe DS1244 has a lithium power source that is designed to provide energy for clock activity and clockand RAM dat

DS1244/DS1244P8 of 19ABSOLUTE MAXIMUM RATINGS*Voltage Range on Any Pin Relative to Ground -0.3V to +6.0VStorage Temperature Range -40ºC to +85ºCSolde

DS1244/DS1244P9 of 19DC ELECTRICAL CHARACTERISTICS Over the operating range (3.3V)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESInput Leakage C