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产品名称：M41ST87W
产品封装：SSOP-20
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
M41ST87W
Features
- 5.0, 3.3, or 3.0 V operation
- 400 kHz I2C bus
- NVRAM supervisor to non-volatize external LPSRAM
- 2.5 to 5.5 V oscillator operating voltage
- Automatic switchover and deselect circuitry
- Choice of power-fail deselect voltages
- M41ST87Y:(not recommended for new design, contact ST sales office for availability)THS = 1: VPFD≈ 4.63 V; VCC= 4.75 to 5.5 VTHS = 0: VPFD≈ 4.37 V; VCC= 4.5 to 5.5 V
- M41ST87W:THS = 1: VPFD≈ 2.9 V; VCC= 3.0 to 3.6 VTHS = 0: VPFD≈ 2.63 V; VCC= 2.7 to 3.6 V
- Two independent power-fail comparators (1.25 V reference)
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
- 128 bytes of clearable, general purpose NVRAM
- Programmable alarm and interrupt function (valid even during battery backup mode)
- Programmable watchdog timer
- Unique electronic serial number (8-byte)
- 32 kHz frequency output available upon power-on
- Microprocessor power-on reset output
- Battery low flag
- Ultra-low battery supply current of 500 nA (typ)
- Security features
- Tamper indication circuits with timestamp and RAM clear
- LPSRAM clear function (TPCLR)
- Packaging includes a 28-lead, embedded crystal SOIC and a 20-lead SSOP
- Oscillator stop detection
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