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产品名称：M41ST85W
产品封装：SOP-28
产品品牌：STMicroelectronics
PDF文档：下载
库 存：查看
电 话：0755-83035811
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产品介绍
M41ST85W
Features
- Automatic battery switchover and WRITE protect for:
- External low power SRAM (LPSRAM)
- 400 kHz I2C serial interface
- 3.0/3.3 V operating voltage
- Ultralow battery supply current of 500 nA (max)
- RoHS compliant
- Lead-free second level interconnect
- Serial RTC features
- 44 bytes of general purpose NVRAM
- Counters for:
- Seconds, minutes, hours, day, date, month, and year
- Tenths/hundredths of seconds
- Clock calibration register allows compensation for crystal variations over temperature
- Programmable alarm with repeat modes
- Functions in battery back-up mode
- Power-down timestamp (HT bit)
- 2.5 to 5.5 V oscillator operating voltage
- Microprocessor supervisor features
- Programmable watchdog
- 62.5 ms to 128 s time-out period
- Early power-fail warning circuit (PFI/PFO) with 1.25 V precision reference
- Power-on reset/low voltage detect
- Reset voltage, VPFD= 2.60 V (nom)
- Watchdog can be steered to reset output
- NVRAM supervisor features
- Non-volatizes external LPSRAM
- Automatically switches to back-up battery and deselects (write-protects) external LPSRAM via chip-enable gate
- Power-fail deselect (write protect) voltage, VPFD= 2.60 V (nom)
- Switchover, VSO= 2.50 V (nom)
- Battery monitor (battery low flag)
- Other features
- Programmable squarewave generator (1 Hz to 32 KHz)
- Package options:
- 28-lead SNAPHAT®IC (SOH28) SNAPHAT battery/crystal top to be ordered separately
- 28-lead embedded crystal SOIC (SOX28)
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