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M41ST87WMX6
M41ST87WMX6 - Brand New STMicroelectronics Real-time Clocks (RTC)
Credit Card - One-month free return and one year warranty.
- Full or Partial Refund, if the item is not as described
- Full Refund if you don't receive your order
Description
The M41ST87Y/W secure serial RTC and NVRAM supervisor 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
) 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. Addresses and data are transferred
serially via a two line, bidirectional 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
■ 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:
THS = 1: VPFD≈ 4.63 V; VCC = 4.75 to 5.5 V
THS = 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 V
THS = 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
Shipping
| First item | Additional item | Service | Description |
|---|---|---|---|
| $0.00 | Free | Free Shipping | Estimated 15-30 business days via Registered Air Mail or others |
| $27.50 | Free | Expedited Shipping | Estimated delivery time is 3-5 business days, with some areas possibly taking 6-9 business days depending on the shipping address. The main courier companies include but are not limited to UPS, DHL, and FedEx. |
| $0.00 | Free | Buyer cooperating carrier | Using buyer's cooperating carrier. Buyer should create a shipping label and share it to us. And then we will call carrier for pickup |
| $38.00 | Free | Expedited Shipping | Estimated delivery time is 3-5 business days, with some areas possibly taking 6-9 business days depending on the shipping address. The main courier companies include but are not limited to UPS, DHL, and FedEx. |
Delivery
- The transportation time may be delayed due to customs clearance, local holidays or abnormal events.
- The estimated time is based on the fastest speed provided by commercial couriers (DHL, FedEx, UPS etc).
- The estimated time does not include the lead time of the item. The lead time of most items is 2–5 business days. If more than 5 working days are needed, we will manually confirm with you.
| Flag | Country | Express Delivery | Standard Delivery |
|---|---|---|---|
 | United States | 3 - 5 days | 10-15 days |
 | Canada | 3 - 5 days | 10-20 days |
 | Mexico | 3 - 5 days | 10-17 days |
 | Germany | 3 - 5 days | 10-12 days |
 | Italy | 3 - 5 days | 10-15 days |
 | United Kingdom | 3 - 5 days | 10-12 days |
Estimated Delivery
This item requires 2-5 business days for processing before shipping after payment is confirmed. And depending on the destination and shipping method.
Return Policy
| Return window | Refund type | Return shipping |
|---|---|---|
| 60 days after receiving item | Money Back or Replacement | Buyer pays for return shipping |
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