Rainbow-electronics DS1254 Manual do Utilizador

1 of 17 060800 FEATURES § Real-time clock (RTC) keeps track of hundredths of seconds, seconds, minutes, hours, days, date, months, and year

DS1254 10 of 17 Figure 4. MEMORY READ CYCLE TIMING (Note 9) Figure 5. MEMORY WRITE CYCLE TIMING, WRITE ENABLE CONTROLLED (Not

DS1254 11 of 17 Figure 6. MEMORY WRITE CYCLE TIMING, CHIP-ENABLE CONTROLLED (Notes 5, 7, 8, 10, 11, 12, and 13) Figure

DS1254 12 of 17 Figure 9. POWER-UP/POWER-DOWN WAVEFORM TIMING (Note 14) V CC V PF(max) V PF(min) t F t FB t PD t DR V BAT t REC tBPU Slews with VC

DS1254 13 of 17 Figure 10. BATTERY WARNING DETECTION (Note 3) BATTERY WARNING TIMING (0°C to +70°C; VCC = 5.0V±10%) PARAME

DS1254 14 of 17 NOTES: 1) Voltage referenced to ground. 2) These parameters are sampled with a 50pF load and are not 100% tested. 3) BW is an ope

DS1254 15 of 17 DS1254 PACKAGE DIMENSIONS PKG MIN MAX A IN MM 1.570 39.88 1.580 40.13 B IN MM 1.570 39.88 1.580 40.13 C IN MM 0.033 0.84 0.043

DS1254 16 of 17 DS1254 PACKAGE DIMENSIONS (WITH ATTACHED DS3800 BATTERY CAP) PKG MIN MAX A IN MM 1.656 42.06 1.668 42.37 B IN MM 1.656 42.06 1

DS1254 17 of 17 DS1254 RECOMMENDED LAND PATTERN (With Overlaid Package Outline) The DS1254 ball grid array (BGA) is a subset of the industry-standar

DS1254 2 of 17 DESCRIPTION The DS1254 is a fully static nonvolatile RAM (NV SRAM) (organized as 2M works by 8 bits) with built-in real-time clock. I

DS1254 3 of 17 RAM READ MODE The DS1254 executes a read cycle whenever WE is inactive (high) and CE is active (low). The unique address specifie

DS1254 4 of 17 advance and all subsequent write cycles are ignored. If a read cycle occurs at any time during pattern recognition, the present seque

DS1254 5 of 17 Figure 3. PHANTOM CLOCK REGISTER DEFINTION

DS1254 6 of 17 AM/PM/12/24 MODE Bit 7 of the hours register is defined as the 12-hour or 24-hour mode select bit. When high, the 12-hour mode is sel

DS1254 7 of 17 ABSOLUTE MAXIMUM RATINGS* Voltage Range on Any Pin Relative to Ground -0.3V to +6.0V Operating Temperature Range 0°C to +70°C S

DS1254 8 of 17 CAPACITANCE (TA = +25°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Capacitance:

DS1254 9 of 17 AC ELECTRICAL CHARACTERISTICS (0°C to +70°C; VCC = 3.3V±10%) PARAMETER SYMBOL MIN MAX UNITS NOTES Read Cycle Time tRC 15