M41T56M6 STMicroelectronics, M41T56M6 Datasheet - Page 5

• Manufacturer Part Number: M41T56M6
• Description: Real Time Clock Serial 512 (64x8)
• Manufacturer: STMicroelectronics

Specifications of M41T56M6

• Function: Clock, Calendar
• Rtc Memory Size: 64 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-8
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1
Description
The M41T56 is a low power, serial real-time clock with 56 bytes of NVRAM. A built-in
32,768Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used for
the clock/calendar function and are configured in binary coded decimal (BCD) format.
Addresses and data are transferred serially via a two-line, bidirectional bus. The built-in
address register is incremented automatically after each WRITE or READ data byte.
The M41T56 clock has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply during power failures. The energy needed to
sustain the RAM and clock operations can be supplied from a small lithium coin cell.
Typical data retention time is in excess of 10 years with a 50mAh, 3V lithium cell. The
M41T56 is supplied in an 8-lead plastic SOIC package.
Figure 1.
Logic diagram
OSCI
SCL
V CC
V SS
M41T56
V BAT
OSCO
SDA
FT/OUT
AI02304B
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