Features: 2.0 to 5.5V clock operating voltage
Ultra-low battery supply current of 365nA
Counters for tenths/hundredths of seconds,seconds, minutes, hours, day, date, month,year, and century
Programmable clock calibration (analog and digital)
Automatic switch-over and reset output circuitry (fixed reference)
M41T93S: VCC = 3.0V to 5.5V (2.85V VRST 3.00V)
M41T93R: VCC = 2.7V to 5.5V (2.55V VRST 2.70V)
M41T93Z: VCC = 2.38V to 5.50V (2.25V VRST 2.38V)
Compatible with SPI Bus serial interface (positive clock SPI modes)
Programmable alarm with interrupt function (valid even during battery back-up mode)
Optional 2nd programmable alarm available
Square wave output (defaults to 32kHz on power-up)
RESET (RST) output
Watchdog timer
Programmable 8-bit counter/timer
7 Bytes of battery-backed user SRAM
Battery low flag
Power-down time stamp (HT Bit)
Low operating current of 80A
Oscillator stop detection
Battery or super-cap™ Back-up
Operating temperature of 40°C to 85°C
Package options include:
a 16-Lead QFN or an 18-Lead Embedded Crystal SOIC
RoHS Compliance: lead-free components are compliant with the RoHS directive.Pinout
SpecificationsStressing the device above the rating listed in the "Absolute Maximum Ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents.
|
Symbol |
Parameter |
Unit |
Value(1) |
|
TSTG |
Storage temperature (VCC Off, Oscillator Off) |
°C |
55 to 125 |
|
VCC |
Supply voltage |
V |
0.3 to 7.0 |
|
TSLD(2) |
Lead solder temperature for 10 seconds |
°C |
260 |
|
VIO |
Input or output voltages |
V |
0.2 to Vcc+0.3 |
|
IO |
Output current |
mA |
20 |
|
PD |
Power dissipation |
W |
1 |
1. Data based on characterization results, not tested in production.
2. Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30 seconds).DescriptionThe M41T93 is a low power Serial SPI Bus Real Time Clock with a built-in 32.768kHz oscillator (external crystal-controlled for the QFN16 package, and embedded crystal for the SOX18 package). Eight bytes of the Register M41T93 Map (see Table 3 on page 18) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 17 bytes of the Register Map provide status/control of the two Alarms, Watchdog,8-Bit Counter, and Square Wave functions. An additional seven bytes of M41T93 are made available as user SRAM.
Addresses and data of M41T93 are transferred serially via a serial SPI bus-compatible interface. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T93 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 M41T93 needed to sustain the clock operations can be supplied by a small lithium button battery when a power failure occurs.
Functions of M41T93 available to the user include a non-volatile, time-of-day clock/calendar, Alarm interrupt, Watchdog Timer, programmable 8-bit Counter, and Square Wave outputs. The eight clock address locations contain the century, year, month, date, day, hour, minute, second, and tenths/hundredths of a second in 24 hour BCD format. Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. The M41T93 is supplied in either a QFN16 or an SOX18 (MY), 300mil SOIC which includes an embedded 32kHz crystal. The SOX18 package of M41T93 requires only a user-supplied battery to provide non-volatile operation.
M41T93 Data Sheet
