M41T00M STMICROELECTRONICS [STMicroelectronics], M41T00M Datasheet - Page 2

• Manufacturer Part Number: M41T00M
• Description: Serial Access TIMEKEEPER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M41T00
Table 2. Absolute Maximum Ratings
Note: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress
Figure 2. SOIC Connections
The M41T00 clock has a built-in power sense cir-
cuit which detects power failures and automatical-
ly 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 5years
with a 50mA/h 3V lithium cell. The M41T00 is sup-
plied in 8 lead Plastic Small Outline package.
2/15
Symbol
T
rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of
this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect reliability.
CAUTION: Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode.
V
V
P
T
STG
I
CC
O
IO
A
D
OSCO
V BAT
OSCI
V SS
Ambient Operating Temperature
Storage Temperature (V
Input or Output Voltages
Supply Voltage
Output Current
Power Dissipation
1
2
3
4
M41T00
AI00531
8
7
6
5
V CC
FT/OUT
SCL
SDA
Parameter
CC
Off, Oscillator Off)
OPERATION
The M41T00 clock operates as a slave device on
the serial bus. Access is obtained by implementing
a start condition followed by the correct slave ad-
dress (D0h). The 8 bytes contained in the device
can then be accessed sequentially in the following
order:
1.
2.
3.
4.
5.
6.
7.
8.
The M41T00 clock continually monitors V
out of tolerance condition. Should V
V
and resets the device address counter. Inputs to
the device will not be recognized at this time to
prevent erroneous data from being written to the
device from an out of tolerance system. When V
falls below V
over to the battery and powers down into an ultra
low current mode of operation to conserve battery
life. Upon power-up, the device switches from bat-
tery to V
SO
, the device terminates an access in progress
CC
Seconds Register
Minutes Register
Century/Hours Register
Day Register
Date Register
Month Register
Years Register
Control Register
at V
SO
, the device automatically switches
SO
and recognizes inputs.
–55 to 125
–40 to 85
–0.3 to 7
–0.3 to 7
Value
0.25
20
CC
fall below
CC
Unit
mA
°C
°C
W
V
V
for an
CC