M41T81M6F STMicroelectronics, M41T81M6F Datasheet - Page 15

• Manufacturer Part Number: M41T81M6F
• Description: IC RTC SERIAL W/ALARM 8-SOIC
• Manufacturer: STMicroelectronics
• Type: Clock/Calendar/Alarmr

Specifications of M41T81M6F

• Memory Size: 20B
• Time Format: HH:MM:SS:hh (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-4709-2

M41T81
The IRQ/FT/OUT/SQW pin is an open drain output which requires a pull-up resistor to V
for proper operation. A 500-10 k resistor is recommended in order to control the rise time.
The FT bit is cleared on power-down.
Figure 10. Crystal accuracy across temperature
Figure 11. Clock calibration
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Frequency (ppm)
–100
–120
–140
–160
–20
–40
–60
–80
20
0
–40
–30
–20
–10
Doc ID 7529 Rev 10
0
10
Temperature °C
ΔF = K x (T – T
F
K
= –0.036 ppm/°C
20
30
T
O
= 25°C ± 5°C
O
)
2
40
2
± 0.006 ppm/°C
50
60
2
Clock operation
70
80
AI00594B
AI07888
15/29
CC