Datasheet

M41T0 Description
Doc ID 9105 Rev 7 5/23
1 Description
The M41T0 real-time clock is a low power serial real-time clock with a built-in 32.768 kHz
oscillator (external crystal controlled). Eight registers 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 M41T0 is supplied in 8-lead plastic small outline package.
Figure 1. Logic diagram
Figure 2. SOIC connections
1. NF pin must be tied to V
SS
.
Table 1. Signal names
OSCI Oscillator input
OCSO Oscillator output
OUT Output driver (open drain)
SDA Serial data address input / output
SCL Serial clock
NF
(1)
1. NF pin must be tied to V
SS
.
No function
V
CC
Supply voltage
V
SS
Ground
AI07028
OSCI
V
CC
M41T0
V
SS
SCL
OSCO
SDA
OUT
1
SDAV
SS
SCL
OUTOSCO
OSCI V
CC
NF
(1)
AI07029
M41T0
2
3
4
8
7
6
5