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8581
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Page - 3 MQ372-02
4. Absolute Maximum Ratings
GND = 0 V
Item Symbol Condition Rating Unit
Supply voltage V
DD
Between V
DD
and GND
−0.3
to +7.0 V
Input voltage (1) V
IN1
FOE pin
GND−0.3
to V
DD
+0.3 V
Input voltage (2) V
IN2
SCL and SDA pins
GND−0.3
to +8.0 V
Output voltage (1) V
OUT1
FOUT pin
GND−0.3
to V
DD
+0.3 V
Output voltage (2) V
OUT2
SDA and /INT pins
GND−0.3
to +8.0 V
Storage temperature T
STG
When stored separately,
without packaging
−55
to +125
°C
5. Recommended Operating Conditions
GND = 0 V V
Item Symbol Condition Min. Typ. Max. Unit
Operating supply voltage V
DD
−
1.8 3.0 5.5 V
Clock supply voltage V
CLK
−
1.6 3.0 5.5 V
Operating temperature T
OPR
No condensation
−40
+25 +85
°C
6. Frequency Characteristics
GND = 0 V
Item Symbol Condition Rating Unit
Frequency precision
∆ f /f Ta = +25 °C, V
DD
= 3.0 V
5 ± 23.0
(∗1)
× 10
-6
Frequency/voltage
characteristics
f /V
Ta = +25 °C, V
DD
= 2.0 V to 5.0 V ± 2 Max. × 10
-6
/V
Frequency/temperature
characteristics
Top
Ta = −10 °C to +70 °C,
V
DD
= 3.0 V ; +25 °C reference
+10 / −120 × 10
−6
Oscillation start time t
STA
Ta = +25 °C, V
DD
= 3.0 V
3 Max. s
Aging fa
Ta = +25 °C, V
DD
= 3.0 V, first year ± 5 Max. × 10
−6
/year
(∗1)
Precision gap per month: 1 minutes (excluding offset value)
7. Electrical Characteristics
7.1. DC characteristics
*Unless otherwise specified, GND = 0 V , V
DD
= 1.8 V to 5.5 V , Ta = −40 °C to +85 °C
Item Symbol Condition Min. Typ. Max. Unit
Current
consumption (1)
I
DD1
V
DD
= 5 V
0.65 1.2
Current
consumption (2)
I
DD2
f
SCL
= 0 Hz
/INT = V
DD
, FOE = GND
FOUT; output OFF
( low level )
V
DD
= 3 V
0.45 0.8
µA
Current
consumption (3)
I
DD3
V
DD
= 5 V
3.0 7.5
Current
consumption (4)
I
DD4
f
SCL
= 0 Hz
/INT, FOE = V
DD
FOUT;
32.768 kHz output ON ,
CL = 0 pF
V
DD
= 3 V
1.7 4.5
µA
Current
consumption (5)
I
DD5
V
DD
= 5 V
8.0 20.0
Current
consumption (6)
I
DD6
f
SCL
= 0 Hz
/INT, FOE = V
DD
FOUT ;
32.768 kHz output ON ,
CL = 30 pF
V
DD
= 3 V
5.0 12.0
µA
V
IH1
FOE pin
0.7 × V
DD
V
DD
+ 0.3 V
High-level
input voltage
V
IH2
SCL and SDA pins
0.7 × V
DD
6.0 V
Low-level
input voltage
V
IL
Input pin
GND − 0.3
0.3 × V
DD
V
V
OH1
V
DD
=5 V, I
OH
=−1 mA
4.5 5.0
V
OH2
V
DD
=3 V, I
OH
=−1 mA
2.2 3.0
High-level
output voltage
V
OH3
FOUT pin
V
DD
=3 V, I
OH
=−100 µA
2.9 3.0
V
V
OL1
V
DD
=5 V, I
OL
=1 mA GND GND+0.5
V
OL2
V
DD
=3 V, I
OL
=1 mA GND GND+0.8
V
OL3
FOUT pin
V
DD
=3 V, I
OL
=100 µA
GND GND+0.1
V
V
OL4
V
DD
=5 V, I
OL
=1 mA GND GND+0.25
V
OL5
/INT pin
V
DD
=3 V, I
OL
=1 mA GND GND+0.4
V
Low-level
output voltage
V
OL6
SDA pin
V
DD
≥2 V, I
OL
=3 mA
GND GND+0.4 V
Input leakage
current
I
LK
Input pin, V
IN
= V
DD
or GND
−0.5
0.5
µA
Output leakage
current
I
OZ
/INT, SDA, FOUT pins, V
OUT
= V
DD
or GND
−0.5
0.5
µA