M41T81MY6 STMICROELECTRONICS [STMicroelectronics], M41T81MY6 Datasheet - Page 14

• Manufacturer Part Number: M41T81MY6
• Description: Serial Access Real-Time Clock with Alarms
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M41T81
Data Retention Mode
With valid V
cessed as described above with READ or WRITE
Cycles. Should the supply voltage decay, the pow-
er input will be switched from the V
battery when V
Switchover Voltage (V
registers will be maintained by the attached bat-
tery supply. As V
Figure 17. Power Down/Up Mode AC Waveforms
Table 8. Power Down/Up AC Characteristics
Note: 1. V
Table 9. Power Down/Up Trip Points DC Characteristics
Note: 1. All voltages referenced to V
14/28
V
Sym
V
RST
Symbol
SO
t
2. Valid for Ambient Operating Temperature: T
2. Valid for Ambient Operating Temperature: T
REC
t
PD
CC
Battery Back-up Switchover Voltage
Register Bit Reset Voltage
V CC
V SO
SDA
SCL
fall time should not exceed 5mV/µs.
CC
SCL and SDA at V
SCL and SDA at V
CC
applied, the M41T81 can be ac-
CC
falls below the Battery Back-up
continues to fall, the M41T81
tPD
SO
Parameter
). At this time the clock
SS
.
IH
IH
Parameter
before Power Down
after Power Up
(1,2)
CC
pin to the
A
A
= –40 to 85°C; V
= –40 to 85°C; V
(1,2)
DON'T CARE
CC
CC
will pass through the Register Bit Reset Voltage
(V
but also resetting certain Control Bits (see Table
13, page 21). On power-up, when V
nominal value, write protection continues for t
For a further, more detailed review of lifetime cal-
culations, please see Application Note AN1012.
V
= 2.0 to 5.5V (except where noted).
= 2.0 to 5.5V (except where noted).
RST
BAT
Min
1.1
) threshold, not only write protecting itself,
– 0.80
Min
10
0
V
BAT
Typ
– 0.50
Typ
tREC
V
BAT
Max
AI00596
2.0
Max
– 0.30
CC
returns to a
Unit
Unit
nS
µS
V
V
REC
.