m41t94 STMicroelectronics, m41t94 Datasheet - Page 32

• Manufacturer Part Number: m41t94
• Description: Serial Real-time Clock With 44 Bytes Nvram And Reset
• Manufacturer: STMicroelectronics

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Figure 17. Power down/up mode AC waveforms
Table 15.
1. Valid for ambient operating temperature: T
2. V
3. V
4. Programmable (see
5. At 25°C, V
Symbol
t
V CC
V PFD (max)
V PFD (min)
V SO
INPUTS
RST
OUTPUTS
REC
t
until 200µs after V
t
FB
t
t
F
PFD
PFD
DR
t
RB
R
(2)
(3)
(4)
(min) to V
(max) to V
V
V
V
V
Power up deselect time
Expected data retention time
CC
Power down/up AC characteristics
PFD
PFD
PFD
SS
= 0V (when using SOH28 + M4T28-BR12SH SNAPHAT top).
SS
(PER CONTROL INPUT)
to V
PFD
(min) to V
(max) to V
(min) to V
CC
fall time of less than t
VALID
PFD
(min) fall time of less than t
Table 8 on page
RECOGNIZED
passes V
tF
(min) V
PFD
SS
PFD
Parameter
PFD
V
(max) V
CC
CC
(min) V
(min).
fall time
rise time
28).
tFB
FB
CC
CC
(1)
A
may cause corruption of RAM data.
= –40 to 85°C; V
rise time
fall time
F
may result in deselection/write protection not occurring
tDR
DON'T CARE
HIGH-Z
CC
= 2.7 to 5.5V (except where noted).
10
Min
300
10
10
40
tRB
1
(5)
Typ
tR
Max
200
(PER CONTROL INPUT)
tREC
RECOGNIZED
VALID
YEARS
Unit
AI03687
ms
µs
µs
µs
µs