M41ST87Y_10 Datasheet, PDF (46/52 Pages) STMicroelectronics – 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

DC and AC parameters
Figure 28. Power down/up mode AC waveforms
VCC
VPFD (max)
VPFD (min)
VSO
tF
tFB
tPD
PFO
VALID
M41ST87Y, M41ST87W
tR
tRB
trec
VALID
INPUTS
RECOGNIZED
DON'T CARE
RECOGNIZED
RST
OUTPUTS
(1)
ECON
VALID
(PER CONTROL INPUT)
HIGH-Z
VALID
(PER CONTROL INPUT)
AI07085
1. E_CON available in the SOX28 (MX) package only.
Table 19. Power down/up AC characteristics
Symbol
Parameter⁽¹⁾
Min
Typ
Max
Unit
t_F(2)
t_FB(3)
t_PD
t_PFD
t_R
t_RB
t_rec
V_PFD(max) to V_PFD(min) V_CC fall time
V_PFD(min) to V_SS V_CC fall time
EX at V_IH before power down
PFI to PFO propagation delay
V_PFD(min) to V_PFD(max) V_CC rise time
V_SS to V_PFD(min) V_CC rise time
Power-up deselect time
300
µs
10
µs
0
µs
15
25
µs
10
µs
1
µs
96
98⁽⁴⁾
ms
1. Valid for ambient operating temperature: T_A = –40 to 85 °C; V_CC = 4.5 to 5.5 V or 2.7 to 3.6 V (except where noted).
2. V_PFD(max) to V_PFD(min) fall time of less than t_F may result in deselection/write protection not occurring until
200 µs after V_CC passes V_PFD(min).
3. V_PFD(min) to V_SS fall time of less than t_FB may cause corruption of RAM data.
4. Programmable (see Table 12 on page 40)
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Doc ID 9497 Rev 8