M41T81MX6TR STMicroelectronics, M41T81MX6TR Datasheet - Page 15

• Manufacturer Part Number: M41T81MX6TR
• Description: Real Time Clock Serial 512 (64x8)
• Manufacturer: STMicroelectronics

Specifications of M41T81MX6TR

• Function: Clock, Calendar, Alarm, Timer Interrupt
• Rtc Memory Size: 20 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial
• Package / Case: SO-28
• Time Format: HH:MM:SS:hh
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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