M41ST85W DC and AC parameters
Doc ID 7531 Rev 11 31/43
Table 11. DC characteristics
Sym Parameter Test condition
(1)
1. Valid for ambient operating temperature: T
A
= –40 to 85°C; V
CC
= 2.7 to 3.6 V (except where noted).
M41ST85W
Unit
Min Typ Max
I
BAT
(2)
2. Measured with V
OUT
and E
CON
open.
Battery current OSC ON
T
A
= 25°C, V
CC
= 0 V, V
BAT
= 3 V
400 500 nA
Battery current OSC OFF 50 nA
I
CC1
Supply current f = 400 kHz 0.75 mA
I
CC2
Supply current (standby)
SCL, SDA = V
CC
– 0.3 V
or V
SS
+ 0.3 V
0.50 mA
I
LI
(3)
3. RSTIN1 and RSTIN2 internally pulled-up to V
CC
through 100 kΩ resistor. WDI internally pulled-down to V
SS
through
100 kΩ resistor.
Input leakage current 0V ≤ V
IN
≤ V
CC
±1 µA
Input leakage current (PFI) –25 2 25 nA
I
LO
(4)
4. Outputs deselected.
Output leakage current 0V ≤ V
IN
≤ V
CC
±1 µA
I
OUT1
(5)
5. External SRAM must match RTC supervisor chip V
CC
specification.
V
OUT
current (active) V
OUT1
> V
CC
– 0.3 V 100 mA
I
OUT2
V
OUT
current (battery backup) V
OUT2
> V
BAT
– 0.3 V 100 µA
V
IH
Input high voltage 0.7V
CC
V
CC
+ 0.3 V
V
IL
Input low voltage –0.3 0.3V
CC
V
V
BAT
Battery voltage 2.5 3.0 3.5
(6)
6. For rechargeable backup, V
BAT
(max) may be considered V
CC
.
V
V
OH
Output high voltage
(7)
7. For PFO and SQW pins (CMOS).
I
OH
= –1.0 mA 2.4 V
Pull-up supply voltage (open drain) RST, IRQ/FT/OUT 3.6 V
V
OHB
(8)
8. Conditioned output (E
CON
) can only sustain CMOS leakage current in the battery backup mode. Higher leakage currents
will reduce battery life.
V
OH
(battery backup) I
OUT2
= –1.0 µA 2.5 2.9 3.5 V
V
OL
Output low voltage I
OL
= 3.0 mA 0.4 V
Output low voltage (open drain)
(9)
9. For IRQ/FT/OUT, RST pins (open drain): if pulled-up to supply other than V
CC
, this supply must be equal to, or less than
3.0 V when V
CC
= 0 V (during battery backup mode).
I
OL
= 10 mA 0.4 V
V
PFD
Power fail deselect 2.55 2.60 2.70 V
V
PFI
PFI input threshold V
CC
= 3 V(W) 1.225 1.250 1.275 V
PFI hysteresis PFI rising 20 70 mV
V
SO
Battery backup switchover 2.5 V
