STM1404 查看數據表（PDF） - STMicroelectronics
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STM1404 Datasheet PDF : 35 Pages
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STM1404
DC and AC parameters
Table 6. DC and AC characteristics (continued)
Alter-
Sym
native
Description
Test condition(1)
VOHB
VOH battery backup
(Vccsw)
ISOURCE = 100 µA
Pull-up supply voltage
(open drain)
RST, SAL, BLD, PFO
Power-fail comparator
VPFI
PFI input threshold PFI falling (VCC < 3.6 V)
PFI hysteresis
PFI rising (VCC < 3.6 V)
tPFD
PFI to PFO
propagation delay
Battery switchover
Power- VBAT > VSW
Battery backup
down
VBAT < VSW
switchover voltage (6)(7)
VBAT > VSW
VSO
Power-up
VBAT < VSW
VSW
Hysteresis
Battery low voltage detect
VDET
M
Battery detect
threshold
On power-
up only
N
O
Voltage reference (option for STM1404A)(8)
VREF
Voltage reference (see
Section 2.9: VREF,
reference voltage
output (1.237, typ) on
page 13)
0°C to 85°C
–40° to 0°C
IREF+
Source current
0°C to 85°C
–40° to 0°C
IREF–
Vn
Sink current
Output voltage noise
f = 100 Hz to 100 kH
Min
0.8VBAT
1.212
2.25
2.45
3.14
1.212
1.200
15
10
10
Typ
Max Unit
V
3.6
V
1.237
10
2
1.262 V
20
mV
µs
VSW
V
VBAT
V
VSW
V
VBAT
V
2.4
V
40
mV
2.30
2.34
V
2.50
2.55
V
3.20
3.26
V
1.237
1.262 V
1.237
1.274 V
25
15
13
10-100
µA
µA
µA
µVrms
27/36
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