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PDF LM3724 Data sheet ( Hoja de datos )
| Número de pieza | LM3724 | |
| Descripción | 5-Pin Microprocessor Reset Circuits | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 2001
LM3722/LM3723/LM3724
5-Pin Microprocessor Reset Circuits
General Description
The LM3722/LM3723/LM3724 microprocessor supervisory
circuits monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor
during power-up, power-down, brown-out conditions, and
manual reset.
The LM3722/LM3723/LM3724 asserts a reset signal when-
ever the supply decreases below the factory-programmed
reset threshold for at least 100 ms. The reset signal remains
asserted for 190 ms after VCC rises above the threshold.
The LM3722 has an active-low RESET push-pull output. The
LM3723 has an active-high RESET push-pull output. The
LM3724 has an active-low open-drain RESET output.
Three standard reset voltage options are available, suitable
for monitoring 5V, 3.3V, and 2.5V supply voltages. Additional
reset voltages are also available; contact National Semicon-
ductor for details.
With a low supply current of only 6µA, the
LM3722/LM3723/LM3724 are ideal for use in portable equip-
ment. The LM3722/LM3723/LM3724 are available in the
5-pin SOT23 package.
Features
n Precise monitoring of 2.5V, 3.3V, and 5V supply
voltages
n Fully specified over temperature
Industrial: −40˚C to +85˚C
Extended: −40˚C to +125˚C
n 100 ms minimum Power-On Reset pulse width, 190 ms
typical:
Active-Low RESET Output (LM3722)
Active-High RESET Output (LM3723)
Active-Low RESET Open Drain Output (LM3724)
n Guaranteed RESET Output valid for VCC ≥ 1V
n Low Supply Current, 6µA typical
n Power supply transient immunity
n Compatible with MAX811/812 applications
Applications
n Microprocessor Systems
n Computers
n Controllers
n Intelligent Instruments
n Portable/Battery-Powered Equipment
Typical Application Circuit
Connection Diagram
20014401
SOT23-5
*( ) are for LM3723
© 2001 National Semiconductor Corporation DS200144
20014402
20014437
www.national.com
1 page  
Electrical Characteristics (Continued)
Typical values are at TA = +25˚C. Limits with standard typeface are for TA = +25˚C, and limits in boldface type apply for the
operating temperature range (−40˚C to +85˚C) for LM372_IM5X, and (−40˚C to +125˚C) for LM372_EM5X, unless otherwise
noted. (Note 4)
Symbol
Parameter
Conditions
Min Typ Max Units
VOH
RESET Output Voltage High
(LM3723)
1.8V < VCC < VTH min, ISOURCE = 150µA
0.8VCC
V
VOL RESET Output Voltage Low VCC = VTH min, ISINK = 1.2 mA
(LM3724)
(LM3724 -2.32/3.08)
0.3 V
IIN RESET Output Leakage
Current (LM3724)
VCC = VTH min, ISINK = 3.2 mA
(LM3724 -4.63)
VCC > 1V, ISINK = 50µA
VCC > VTH, RESET = 5.5V
0.4
0.3
0.5 µA
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which the device operates
correctly. Operating ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical
Characteristics.
Note 2: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the SOT23-5 package must be derated at
4.5mW/˚C at ambient temperatures above 70˚C. The device has internal thermal protection.
Note 4: Production testing done at TA = +25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods.
Note 5: RESET Output for LM3722 and LM3724, RESET output for LM3723.
Note 6: Glitches of 100 ns or less typically will not generate a reset pulse.
5 www.national.com
5 Page 
Typical Application Circuits (Continued)
FIGURE 5. LM3722 Switch Debouncer
20014431
FIGURE 6. LM3723 Power-On Delay
20014424
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM3724.PDF ] | |
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