Rainbow-electronics DS1642 Manual do Utilizador Página 1

1 of 11 080499FEATURES§ Integrated NV SRAM, real time clock,crystal, power fail control circuit and lithiumenergy source§ Standard JEDEC bytewide 2K

DS164210 of 11AC TEST CONDITIONSOutput Load: 100 pF + 1TTL GateInput Pulse Levels: 0.0 to 3.0 VoltsTiming Measurement Reference Levels:Input: 1.5VOutp

DS164211 of 11DS1642 24-PIN PACKAGEPKG 24-PINDIM. MIN MAXA IN.MM1.27037.340.29037.85B IN.MM0.67517.150.70017.78C IN.MM0.3158.000.33578.51D IN.MM0.0751

DS16422 of 11prevents time loss as the timekeeping countdown continues unabated by access to time register data. TheDS1642 also contains its own power

DS16423 of 11SETTING THE CLOCKThe 8th bit of the control register is the write bit. Setting the write bit to a 1, like the read bit, haltsupdates to t

DS16424 of 11RETRIEVING DATA FROM RAM OR CLOCKThe DS1642 is in the read mode whenever WE (write enable) is high, and CE (chip enable) is low. Thedevic

DS16425 of 11ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground –0.3V to +7.0VOperating Temperature 0°C to 70°CStorage Temperature –20°C t

DS16426 of 11READ CYCLE, AC CHARACTERISTICS (0°C to 70°C; VCC = 5.0V ± 10%)70 ns access 100 ns accessPARAMETER SYMBOLMIN MAX MIN MAXUNITS NOTESRead Cy

DS16427 of 11WRITE CYCLE, AC CHARACTERISTICS (0°C to 70°C; VCC = 5.0V ± 10%)70 ns access 100 ns accessPARAMETER SYMBOLMIN MAX MIN MAXUNITS NOTESWrite

DS16428 of 11WRITE CYCLE TIMING DIAGRAM, WRITE-ENABLE CONTROLLEDWRITE CYCLE TIMING DIAGRAM, CE, CONTROLLED

DS16429 of 11POWER-UP/DOWN AC CHARACTERISTICS (0°C to 70°C)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESCE or WE at VIHBefore Power-downtPD0 µsVCC Fall Tim