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UCC1946N

更新时间： 2024-10-02 13:15:07

品牌	Logo	应用领域
德州仪器 - TI		微处理器监控
页数	文件大小	规格书
6页	108K
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UCC1946N 数据手册

UCC1946

UCC2946

UCC3946

Microprocessor Supervisor with Watchdog Timer

FEATURES

DESCRIPTION

•

Fully Programmable Reset Threshold

The UCC3946 is designed to provide accurate microprocessor supervi-

sion, including reset and watchdog functions. During power up, the IC

asserts a reset signal RES with VDD as low as 1V. The reset signal re-

mains asserted until the VDD voltage rises and remains above the re-

set threshold for the reset period. Both reset threshold and reset period

are programmable by the user. The IC is also resistant to glitches on

the VDD line. Once RES has been deasserted, any drops below the

threshold voltage need to be of certain time duration and voltage mag-

nitude to generate a reset signal. These values are shown in Figure 1.

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 will be asserted.

The watchdog function will be disabled during reset conditions.

Fully Programmable Reset Period

Fully Programmable Watchdog Period

2% Accurate Reset Threshold

VDD Can Go as Low as 2V

18µA Maximum IDD

Reset Valid Down to 1V

The UCC3946 is available in 8-pin SOIC(D), 8-pin DIP (N or J) and

8-pin TSSOP(PW) packages to optimize board space.

BLOCK DIAGRAM

VDD

400nA

POWER TO

CIRCUITRY

1.235V

RES

RTH

POWER ON RESET

400nA

8-BIT COUNTER

100mV

CLR A1

WDO

CLK

1.235V

WATCHDOG TIMING

EDGE DETECT

WDI

GND

UDG-98001

Note: Pinout represents the 8-pin TSSOP package.

SLUS247B - FEBRUARY 2000

12 3 4 5 6

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