M40Z300_07 Datasheet, PDF (17/25 Pages) STMicroelectronics – 5V or 3V NVRAM supervisor for up to 8 LPSRAMs

M40Z300, M40Z300W
DC and AC parameters
Table 7. Power down/up mode AC characteristics
Symbol
Parameter⁽¹⁾
Min
Max Unit
t_F(2) V_PFD (max) to V_PFD (min) V_CC fall time
300
µs
t_FB(3) V_PFD (min) to V_SS V_CC fall time
M40Z300
10
M40Z300W
150
µs
µs
t_R
V_PFD(min) to V_PFD (max) V_CC rise time
10
t_EDL Chip enable propagation delay low
M40Z300
M40Z300W
µs
12
ns
20
ns
t_EDH Chip enable propagation delay high
M40Z300
M40Z300W
10
ns
20
ns
t_AS
t_CER
t_REC(4)
A, B set up to E
Chip enable recovery
V_PFD (max) to RST high
t_WPT Write protect time
0
40
40
M40Z300
40
M40Z300W
40
ns
120
ms
120
ms
150
µs
250
µs
t_RB
V_SS to V_PFD (min) V_CC rise time
1
µs
1. Valid for ambient operating temperature: T_A = 0 to 70°C or –40 to 85°C; V_CC = 2.7 to 3.6V or 4.5 to
5.5V(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. t_REC (min) = 20ms for industrial temperature Grade 6 device.
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