M48T02_07 Datasheet, PDF (20/24 Pages) STMicroelectronics – 5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER SRAM

DC and AC parameters
M48T02, M48T12
Table 10. Power down/up AC characteristics
Symbol
Parameter⁽¹⁾
Min
Max
Unit
t_PD
E or W at V_IH before Power Down
0
µs
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
10
µs
t_R
V_PFD (min) to V_PFD (max) V_CC Rise Time
0
µs
t_RB
V_SS to V_PFD (min) V_CC Rise Time
1
µs
t_rec
E or W at V_IH before Power Up
2
ms
1. Valid for Ambient Operating Temperature: T_A = 0 to 70°C; V_CC = 4.75 to 5.5V or 4.5 to 5.5V (except where
noted).
2. V_PFD (max) to V_PFD (min) fall time of less than tF may result in deselection/write protection not occurring
until 200µs 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.
Table 11. Power down/up trip points DC characteristics
Symbol
Parameter⁽¹⁾⁽²⁾
Min
Typ
Max
Unit
M48T02
4.5
4.6
4.75
V
V_PFD Power-fail Deselect Voltage
M48T12
4.2
4.3
4.5
V
V_SO
t_DR(3)
Battery Back-up Switchover Voltage
Expected Data Retention Time
3.0
10
V
YEARS
1. All voltages referenced to V_SS.
2. Valid for Ambient Operating Temperature: T_A = 0 to 70°C; V_CC = 4.75 to 5.5V or 4.5 to 5.5V (except where
noted).
3. At 25°C; V_CC = 0V.
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