Datasheet

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
SLUS247F − APRIL 1997 − REVISED NOVEMBER 2007
3
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ELECTRICAL CHARACTERISTICS
T
A
= 0°C to 70°C and 2.0 V ≤ V
DD
≤ 5.5 V for the UCC3946, T
A
= −40°C to 95°C and 2.1 V ≤ V
DD
≤ 5.5 V for the UCC2946, (unless
otherwise noted)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
REFERENCE
V
DD
Operating voltage
UCC2946 2.1 5.5
V
V
DD
Operating voltage
UCC3946
2.0 5.5
V
I
DD
Supply current
UCC2946 12 18
A
I
DD
Supply current
UCC3946
10 18
µA
V
DD(min)
Minimum operating voltage
(1)
UCC2946 1.1
V
V
DD(min)
Minimum operating voltage
(1)
UCC3946 1.0
V
RESET SECTION
Reset threshold voltage
UCC2946
V
DD
rising
1.170 1.235 1.260
V
Reset threshold voltage
UCC3946
V
DD
rising
1.190 1.235 1.260
V
Threshold hysteresis 15 mV
I
LEAK
Input leakage current 5 nA
V
OH
High-level output voltage I
SOURCE
= 2 mA V
DD
−0.3
I
SINK
= 2 mA 0.1
V
V
OL
Low-level output voltage
UCC2946
I
SINK
= 20 A, VDD = 1 V
0.4
V
V
OL
Low-level output voltage
UCC3946
I
SINK
= 20 µA, VDD = 1 V
0.2
VDD-to-output delay time VDD = −1 mV/µs 120 µs
Reset period
UCC2946
C
RP
= 64 nF
140 200 320
ms
Reset period
UCC3946
C
RP
= 64 nF
160 200 260
ms
WATCHDOG SECTION
V
IH
High-level input voltage, WDI 0.7×V
DD
V
V
IL
Low-level input voltage, WDI 0.3×V
DD
V
Watchdog period
UCC2946
C
RP
= 64 nF
0.96 1.60 2.56
s
Watchdog period
UCC3946
C
RP
= 64 nF
1.12 1.60 2.08
s
Watchdog pulse width 50 ns
V
OH
High-level output voltage I
SOURCE
= 2 mA V
DD
−0.3
V
V
OL
Low-level output voltage I
SINK
= 2 mA 0.1
V
(1)
Minimum supply voltage where RES
is considered valid.