Product Details
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SUMMARY DESCRIPTION The M41ST87Y/W Serial TIMEKEEPER®/Controller SRAM is a low power 1280-bit, static CMOS SRAM organized as 160 bytes by 8 bits. A built-in 32.768 kHz oscillator (internal crystal-controlled) and 8 bytes of the SRAM (see Table 7., page 25) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 11 bytes of RAM provide calibration, status/control of Alarm, Watchdog, Tamper, and Square Wave functions. 8 bytes of ROM and finally 128 bytes of User RAM are also provided. Ad dresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41ST87Y/W has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the SRAM and clock operations can be supplied by a small lithium button cell supply when a power failure occurs. FEATURES SUMMARY ■ 5.0, 3.3, OR 3.0V OPERATING VOLTAGE ■ SERIAL INTERFACE SUPPORTS I2C BUS(400kHz) ■ NVRAM SUPERVISOR FOR EXTERNAL LPSRAM ■ 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE ■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY ■ CHOICE OF POWER-FAIL DESELECT VOLTAGES – M41ST87Y: VCC = 4.75 to 5.5V; THS Bit = 1: 4.50V ≤ VPFD ≤ 4.75V VCC = 4.5 to 5.5V; THS Bit = 0: 4.20V ≤ VPFD ≤ 4.50V – M41ST87W: VCC = 3.0 to 3.6V; THS Bit = 1: 2.8V ≤ VPFD ≤ 3.0V VCC = 2.7 to 3.6V; THS Bit = 0: 2.55V ≤ VPFD ≤ 2.70V ■ TWO INDEPENDENT POWER-FAIL COMPARATORS (1.25V REFERENCE) ■ COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND CENTURY ■ 128 BYTES OF GENERAL PURPOSE RAM ■ PROGRAMMABLE ALARM AND INTERRUPT FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE) ■ PROGRAMMABLE WATCHDOG TIMER ■ UNIQUE ELECTRONIC SERIAL NUMBER (8-BYTE) ■ 32kHz FREQUENCY OUTPUT AVAILABLE UPON POWER-ON ■ MICROPROCESSOR POWER-ON RESET ■ BATTERY LOW FLAG ■ ULTRA-LOW BATTERY SUPPLY CURRENT OF 500nA (TYP) SECURITY FEATURES ■ TAMPER INDICATION CIRCUITS WITH TIMESTAMP AND RAM CLEAR ■ LPSRAM CLEAR FUNCTION (TPCLR) ■ PACKAGING INCLUDES A 28-LEAD, EMBEDDED CRYSTAL SOIC ■ OSCILLATOR STOP DETECTION |
Product Description
| TYPE | DESCRIPTION |
| ANSC PART# | ANSC- M41ST87WMX6TR |
| Category | Integrated Circuits (ICs) |
| Clock/Timing | |
| Real Time Clocks | |
| Manufacturer | - |
| Series | - |
| Packaging | Tape & Reel (TR) |
| Cut Tape (CT) | |
| Part Status | Active |
| DigiKey Programmable | Not Verified |
| Type | Clock/Calendar |
| Features | Alarm, Leap Year, NVSRAM, Square Wave Output, Supervisor, Watchdog Timer |
| Memory Size | 128B |
| Time Format | HH:MM:SS:hh (24 hr) |
| Date Format | YY-MM-DD-dd |
| Interface | I2C, 2-Wire Serial |
| Voltage - Supply | 2.7V ~ 3.6V |
| Voltage - Supply, Battery | 2.5V ~ 3.6V |
| Current - Timekeeping (Max) | 0.5mA @ 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 28-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 28-SO |
| Base Product Number | M41ST87 |
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