M4T28-BR12SH ST Microelectronics, M4T28-BR12SH Datasheet - Page 16

• Manufacturer Part Number: M4T28-BR12SH
• Description: TIMEKEEPER SNAPHAT Battery & Crystal
• Manufacturer: ST Microelectronics

M41ST85Y, M41ST85W
Figure 17. Power Down/Up Mode AC Waveforms
Table 7. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
16/33
Symbol
t
REC
t
t
t
FB
t
t
PFD
2. V
3. V
4. Programmable (see Table 12, page 25)
F
t
PD
RB
(2)
R
(3)
(4)
200µs after V
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
INPUTS
RST
OUTPUTS
E CON
(max) to V
(min) to V
V
V
EX at V
PFI to PFO Propagation Delay
V
V
Power up Deselect Time
PFD
PFD
PFD
SS
CC
to V
PFO
(max) to V
(min) to V
(min) to V
SS
PFD
passes V
IH
tPD
fall time of less than t
PFD
(min) fall time of less than t
before Power Down
(PER CONTROL INPUT)
(min) V
VALID
SS
PFD
RECOGNIZED
PFD
PFD
V
tF
(min).
(max) V
(min) V
CC
CC
Parameter
Fall Time
Rise Time
CC
CC
FB
may cause corruption of RAM data.
Fall Time
Rise Time
A
tFB
(1)
= –40 to 85°C; V
F
may result in deselection/write protection not occurring until
tDR
CC
DON'T CARE
= 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
HIGH-Z
tRB
Min
300
10
10
40
0
1
Typ
15
tR
(PER CONTROL INPUT)
tREC
Max
RECOGNIZED
200
25
VALID
AI03661
Unit
ms
µs
µs
µs
µs
µs
µs