Rainbow-electronics DS1644P Manuale Utente

1 of 11 022101FEATURES Integrated NV SRAM, real time clock,crystal, power-fail control circuit and lithiumenergy source Clock registers are access

DS1644/DS1644P10 of 11DS1644 28-PIN PACKAGEPKG 28-PINDIM MIN MAXA IN.MM1.47037.341.49037.85B IN.MM0.71518.160.74018.80C IN.MM0.3358.510.3659.27D IN.MM

DS1644/DS1644P11 of 11DS1644P WITH DS9034PCX ATTACHEDPKG INCHESDIM MIN NOM MAXA0.920 0.925 0.930B0.955 0.960 0.965C0.240 0.245 0.250D0.052 0.055 0.058

DS1644/DS1644P2 of 11ORDERING INFORMATIONDS1644 28-pin DIP module*DS1644P 34-pin PowerCap ModuleBoard*DS9034PCX (Power Cap) Required;must be ordered

DS1644/DS1644P3 of 11DS1644 BLOCK DIAGRAM Figure 1DS1644 TRUTH TABLE Table 1VCCCE OE WEMODE DQ POWERVIHX X DESELECT HIGH-Z STANDBYX X X DESELECT HIGH-

DS1644/DS1644P4 of 11CLOCK ACCURACY (DIP MODULE)The DS1644 is guaranteed to keep time accuracy to within ±1 minute per month at 25°C. The RTC iscalib

DS1644/DS1644P5 of 11RETRIEVING DATA FROM RAM OR CLOCKThe DS1644 is in the read mode whenever WE (write enable) is high, and CE (chip enable) is lo

DS1644/DS1644P6 of 11ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground -0.3V to +7.0VStorage Temperature -40°C to +85°CSoldering Temper

DS1644/DS1644P7 of 11AC ELECTRICAL CHARACTERISTICS (Over the Operating Range)PARAMETER SYMBOL MIN TYP MAX UNITS NOTESRead Cycle Time tRC120 nsAddress

DS1644/DS1644P8 of 11DS1644 READ CYCLE TIMINGDS1644 WRITE CYCLE TIMING

DS1644/DS1644P9 of 11POWER-DOWN/POWER-UP TIMINGNOTES:1. All voltages are referenced to ground.2. Typical values are at 25°C and nominalsupplies.3.