Datasheet LM3722, LM3723, LM3724 (Texas Instruments) - 2
| Hersteller | Texas Instruments |
| Beschreibung | 5-Pin Microprocessor Reset Circuits |
| Seiten / Seite | 20 / 2 — LM3722,. LM3723,. LM3724. www.ti.com. Connection Diagram. LM3722. LM3723. … |
| Dateiformat / Größe | PDF / 1.1 Mb |
| Dokumentensprache | Englisch |
LM3722,. LM3723,. LM3724. www.ti.com. Connection Diagram. LM3722. LM3723. Figure 3. SOT-23-5. PIN DESCRIPTIONS. PIN. NAME. FUNCTION
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LM3722, LM3723, LM3724
SNVS154E – MAY 2001 – REVISED MARCH 2013
www.ti.com Connection Diagram
GND 1 5 VCC
LM3722
GND 2
LM3723 LM3724
RESET 3 4 MR *(RESET) *( ) are for LM3723
Figure 3. SOT-23-5 PIN DESCRIPTIONS PIN NAME FUNCTION
1 GND Ground reference 2 GND Ground reference, device substrate, connect to ground. RESET Active-low output. RESET remains low while VCC is below the reset threshold voltage, and for 190 LM3722/LM3724 ms after VCC rises above the reset threshold voltage. 3 RESET Active-high output. RESET remains high while VCC is below the reset threshold, and for 190 ms LM3723 after VCC rises above the reset threshold. Active-low input. Reset is asserted whenever this pin is pulled low and remains asserted for 190 ms 4 MR after the MR pin goes high. May be left open. 5 VCC Supply Voltage (+5V, +3.3V, or +2.5V, nominal)
Block Diagram
VCC OPEN for LM3724 Reset Comparator CONNECT for LM3722/LM3723 + 22k Reset Logic and RESET/ - One-Shot Timer RESET Low Line Comparator Manual Reset Comparator + MR - 1.225V Reference
Figure 4. LM3722/LM3723/LM3724 Block Diagram
2 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM3722 LM3723 LM3724 Document Outline FEATURES APPLICATIONS DESCRIPTION Typical Application Circuits Connection Diagram Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Timing Diagram Circuit Information RESET OUTPUT RESET THRESHOLD MANUAL RESET INPUT (MR) Applications Information BENEFITS OF PRECISION RESET THRESHOLDS ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0V OPEN DRAIN OUTPUT (LM3724) NEGATIVE-GOING VCC TRANSIENTS INTERFACING TO µPS WITH BIDIRECTIONAL RESET PINS Typical Application Circuits Revision History
SNVS154E – MAY 2001 – REVISED MARCH 2013
www.ti.com Connection Diagram
GND 1 5 VCC
LM3722
GND 2
LM3723 LM3724
RESET 3 4 MR *(RESET) *( ) are for LM3723
Figure 3. SOT-23-5 PIN DESCRIPTIONS PIN NAME FUNCTION
1 GND Ground reference 2 GND Ground reference, device substrate, connect to ground. RESET Active-low output. RESET remains low while VCC is below the reset threshold voltage, and for 190 LM3722/LM3724 ms after VCC rises above the reset threshold voltage. 3 RESET Active-high output. RESET remains high while VCC is below the reset threshold, and for 190 ms LM3723 after VCC rises above the reset threshold. Active-low input. Reset is asserted whenever this pin is pulled low and remains asserted for 190 ms 4 MR after the MR pin goes high. May be left open. 5 VCC Supply Voltage (+5V, +3.3V, or +2.5V, nominal)
Block Diagram
VCC OPEN for LM3724 Reset Comparator CONNECT for LM3722/LM3723 + 22k Reset Logic and RESET/ - One-Shot Timer RESET Low Line Comparator Manual Reset Comparator + MR - 1.225V Reference
Figure 4. LM3722/LM3723/LM3724 Block Diagram
2 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM3722 LM3723 LM3724 Document Outline FEATURES APPLICATIONS DESCRIPTION Typical Application Circuits Connection Diagram Absolute Maximum Ratings Electrical Characteristics Typical Performance Characteristics Timing Diagram Circuit Information RESET OUTPUT RESET THRESHOLD MANUAL RESET INPUT (MR) Applications Information BENEFITS OF PRECISION RESET THRESHOLDS ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0V OPEN DRAIN OUTPUT (LM3724) NEGATIVE-GOING VCC TRANSIENTS INTERFACING TO µPS WITH BIDIRECTIONAL RESET PINS Typical Application Circuits Revision History