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Updated at 30/10/2025 10:30:15(UTC+8)

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Description

The UCC2946D is a Microprocessor Supervisor with active-low push-pull output. It is designed to provide accurate microprocessor supervision, including reset and watchdog functions. During power up, the device asserts a reset signal RES with VDD as low as 1 V. The reset signal remains asserted until the VDD voltage rises and remains above the reset threshold for the reset period. Both reset threshold and reset period are programmable by the user. The UCCx946 is also resistant to glitches on the VDD line. Once RES has been de-asserted, any drops below the threshold voltage need to be of certain time duration and voltage magnitude to generate a reset signal. An I/O line of the microprocessor may be tied to the watchdog input (WDI) for watchdog functions. If the I/O line is not toggled within a set watchdog period, programmable by the user, WDO is asserted. The watchdog function is disabled during reset conditions.
Fully programmable reset threshold
Fully programmable reset period
Fully programmable watchdog period
Programmable time delay
Input voltage down to 2V
Input 18µA maximum input current
Reset valid down to 1 V
2% Accurate reset threshold
Green product and no Sb/Br

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UCC2946D Specifications

Attribute	Attribute Value

Datasheet	Datasheet
3D Model	3D Model
Mounting Style	Surface Mount
Number of Pins	8 Pin
Case/Package	SOIC-8
Supply Voltage (DC)	5.50V (max)
Supply Current	0.018 mA
Number of Positions	8 Position
Quiescent Current	10.0 µA
Threshold Voltage	Adjustable
Reset Threshold Voltage (Min)	1.17 V
Reset Threshold Voltage (Max)	1.26 V
Operating Temperature (Max)	95 ℃
Operating Temperature (Min)	-40 ℃
Supply Voltage (Max)	5.5 V
Supply Voltage (Min)	2.1 V
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Size-Length	4.9 mm
Size-Width	3.91 mm
Size-Height	1.58 mm
Operating Temperature	-40℃ ~ 85℃ (TA)
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15

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