Datasheet > DS1233A

DS1233A

更新时间： 2023-12-20 18:46:06

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
5页	100K
描述
3.3V、经济型复位芯片

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DS1233A 数据手册

DS1233A

3.3V EconoReset

www.maxim-ic.com

FEATURES

PIN ASSIGNMENT

. Automatically restarts microprocessor after

power failure

DALLAS

DS1233A

Econo

. Monitors pushbutton for external override

. Internal circuitry debounces pushbutton

switch

Reset

. Maintains reset for 350ms after V_CCreturns to

an in-tolerance condition or pushbutton

released

. Accurate 10% or 15% microprocessor 3.3V

power supply monitoring

. Reduces need for discrete components

. Precision temperature-compensated voltage

reference and voltage sensor

. Low-cost TO-92 package or surface mount

SOT-223 package

1 2 3

BOTTOM VIEW

TO-92 PACKAGE

TOP VIEW

SOT-223 PACKAGE

. Internal 5kpull-up resistor

. Operating temperature of -40C to +85C

PIN DESCRIPTION

PIN 1

GROUND

PIN 2

PIN 3

PIN 4

RESET

V_CC

GROUND (SOT-223 ONLY)

DESCRIPTION

The DS1233A EconoReset monitors two vital conditions for a microprocessor: power supply and external

override. A precision temperature-compensated reference and comparator circuit are used to monitor the

status of the power supply (V_CC). When an out-of-tolerance condition is detected, an internal power fail

signal is generated which forces reset to the active state. When V_CCreturns to an in-tolerance condition,

the reset signal is kept in the active state for approximately 350ms to allow the power supply and

processor to stabilize. The second function of the DS1233A is pushbutton reset control. The DS1233A

debounces a pushbutton closure and will generate a 350ms reset pulse upon release.

OPERATION — POWER MONITOR

The DS1233A provides the functions of detecting out-of-tolerance power supply conditions and warning

a processor-based system of impending power failure. When V_CCis detected as out-of-tolerance as

defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active

for approximately 350ms after the power supply has reached the selected tolerance. This allows the power

supply and microprocessor to stabilize before RST is released.

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