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M41T94 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M41T94
Description  Serial real-time clock with 44 bytes NVRAM and reset
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T94 Datasheet(HTML) 1 Page - STMicroelectronics

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November 2007
Rev 5
1/41
1
M41T94
Serial real-time clock with 44 bytes NVRAM and reset
Features
Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
32KHz crystal oscillator integrating load
capacitance (12.5pF) providing exceptional
oscillator stability and high crystal series
resistance operation
Serial peripheral interface (2MHz SPI)
Ultra-low battery supply current of 500nA (max)
2.7 to 5.5V operating voltage
2.5 to 5.5V oscillator operating voltage
Battery low flag
Automatic switchover and deselect circuitry
44 bytes of general purpose RAM
Programmable alarm and interrupt function
(valid even during battery back-up mode)
Accurate programmable watchdog timer (from
62.5ms to 128s)
Microprocessor power-on reset
Choice of power-fail deselect voltages
(VCC = 2.7 to 5.5V):
–THS = VSS; 2.55V ≤ VPFD ≤ 2.70V
–THS = VCC; 4.20V ≤ VPFD ≤ 4.50V
Packaging includes a 28-lead SOIC and
SNAPHAT® top (to be ordered separately) or
16-lead SOIC
28-lead SOIC package provides direct
connection for a SNAPHAT top which contains
the battery and crystal
RoHS compliant
– Lead-free second level interconnect
28
1
16
1
SO16 (MQ)
SOH28 (MH)
SNAPHAT (SH)
battery & crystal
www.st.com


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