m41t81s STMicroelectronics, m41t81s Datasheet - Page 7

• Manufacturer Part Number: m41t81s
• Description: Serial Access Real-time Clock With Alarms
• Manufacturer: STMicroelectronics

Table 1.
1. For SO8 package only.
2. NC and NF pins should be tied to V
Figure 2.
1. Open drain output
Figure 3.
1. NC and NF pins should be tied to V
2. Open drain output
IRQ/OUT/FT/SQW
internally shorted together.
XO
NC
NF
V
SDA
XI
SCL
V
V
BAT
CC
SS
(1)
(2)
(1)
(2)
Signal names
8-pin SOIC (M) connections
18-pin, 300mil SOIC (MY) connections
Interrupt / Output Driver / Frequency Test / Square Wave (Open Drain)
Oscillator Input
Oscillator Output
Serial Data Input/Output
Serial Clock Input
Battery Supply Voltage
Supply Voltage
Ground
No Connect
No Function
NF (1)
NF
V
V
V
NC
NC
NC
NC
BAT
NC
(1)
V
SS
XO
BAT
SS
XI
SS
SS
1
2
3
4
5
6
7
8
9
.
. Pins 2 and 3 are internally shorted together. Pins 17 and 16 are
1
2
3
4
M41T81S
M41T81S
18
17
16
15
14
13
12
11
10
5
8
7
6
NC
NF
NF
V CC
NC
IRQ/FT/OUT/SQW (2)
NC
SCL
SDA
V
IRQ/FT/OUT/SQW
SCL
SDA
CC
(1)
(1)
AI09161
AI09162
(1)
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