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Texas Instruments LM3722IM5X-2.32/NOPB
- Part No.:
- LM3722IM5X-2.32/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM3722IM5X-2.32/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3722IM5X-2.32/NOPB from Texas Instruments is a precision 5-pin SOT-23 microprocessor reset supervisor IC with active-low push-pull RESET output, factory-trimmed 2.32V reset threshold, 190 ms typical reset timeout, guaranteed operation down to VCC ≥1V, and 6 µA typical supply current. It monitors 2.5V supply rails in battery-powered embedded systems to prevent code execution during brown-out.
For engineers reviewing the LM3722IM5X-2.32/NOPB datasheet, LM3722IM5X-2.32/NOPB pinout, LM3722IM5X-2.32/NOPB application, or LM3722IM5X-2.32/NOPB equivalent, key selection criteria include reset threshold accuracy (±20 mV), industrial temperature range (−40°C to +85°C), MR input debouncing, power supply transient immunity, and compatibility with MAX811/812-based designs.
Technical Context
The LM3722IM5X-2.32/NOPB integrates a precision voltage reference (1.225V), dual comparators (reset and manual reset), and a one-shot timer to generate a minimum 100 ms (190 ms typical) active-low reset pulse. Its internal 22 kΩ MR pull-up enables direct switch interfacing without external components.
It uses a bandgap-based threshold detection architecture with 30 ppm/°C tempco, ensuring stable 2.32V reset point across −40°C to +85°C. The push-pull output drives CMOS/TTL loads directly, sinking up to 1.2 mA at VCC = 2.5V while maintaining VOL ≤ 0.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V ±20 mV - precisely matches 2.5V nominal supply tolerance window (90.8–94.8% of 2.5V) |
| Reset Timeout | 100–560 ms - guarantees minimum 100 ms assertion after VCC rise, 190 ms typical for reliable µP initialization |
| Supply Current | 6 µA typical at VCC = 2.5V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| VCC Range | 1.0V to 5.5V - ensures valid RESET output even during deep brown-out down to 1V supply |
| MR Input | Debounced with 22 kΩ internal pull-up - accepts momentary switch closure without external RC network |
| Output Type | Active-low push-pull - eliminates need for external pull-up resistor; drives logic inputs directly |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, RoHS-compliant green finish, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference and substrate connection - must be tied to system ground plane for noise immunity |
| 2 | GND | Second ground terminal - improves thermal dissipation and reduces ground bounce in high-noise environments |
| 3 | RESET | Active-low push-pull output - asserts low during power-up/brown-out and holds for full timeout period |
| 4 | MR | Manual reset input - initiates reset when pulled below 0.25×VCC; internally pulled up to VCC |
| 5 | VCC | Supply input - accepts 1.0V–5.5V; powers internal reference, comparators, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.32V threshold | Factory-trimmed to ±20 mV over temperature - eliminates need for external resistor divider calibration |
| Guaranteed RESET validity at VCC ≥1V | Ensures deterministic reset behavior during ultra-low-voltage brown-out recovery |
| 190 ms typical reset timeout | Exceeds common µP reset hold-time requirements (e.g., ARM Cortex-M, PIC, MSP430) |
| 6 µA supply current | Reduces quiescent power by >50% vs. legacy supervisors - critical for always-on sensor nodes |
| MR input with 22 kΩ pull-up | Supports direct SPST switch connection - no external BOM components required for manual reset |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
Use Scenario: Power sequencing in DIN-rail mounted controllers where 2.5V FPGA configuration rails must stabilize before firmware boot. IC Role / Device Role / Timing Role: Monitors 2.5V rail and asserts active-low RESET to FPGA's PROG_B pin until voltage exceeds 2.32V and remains stable for 190 ms. Use Value: Prevents partial configuration and metastability by enforcing strict power-good timing aligned to Xilinx 7-series FPGA requirements. | Use Scenario: Battery-backed ECG front-end with intermittent wake-up; supply dips during RF transmission cause brown-out risk. IC Role / Device Role / Timing Role: Detects 2.5V analog signal chain supply sag below 2.32V and forces MCU reset before corrupted ADC samples are processed. Use Value: Eliminates false arrhythmia alarms caused by firmware executing with invalid register states during undervoltage. |
| Smart Energy Meter | Wireless Sensor Node |
Use Scenario: Dual-supply meter with 2.5V metrology ASIC and 3.3V communication SoC; both require synchronized reset on AC line dropout. IC Role / Device Role / Timing Role: Supervises 2.5V metrology rail and triggers coordinated reset via shared MR net to secondary supervisor on 3.3V domain. Use Value: Ensures atomic state recovery across domains - prevents mismatched calibration data between metrology and comms layers. | Use Scenario: LoRaWAN node powered by CR2032; supply decays from 3.0V to 2.2V over 2+ years; firmware must halt before EEPROM write corruption. IC Role / Device Role / Timing Role: Provides early-warning reset at 2.32V threshold, giving MCU time to flush buffers and enter deep sleep before VCC falls below 2.2V. Use Value: Extends usable battery life by 18% versus fixed 2.0V reset ICs, while guaranteeing non-volatile memory integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX811TEUS+T | 2.93V reset threshold, 140 ms min timeout, 3.6 µA ICC, SOT-23-5 | Designed for 3.3V systems; lacks MR pull-up; requires external 100 kΩ pull-up on MR | Select when 2.93V threshold aligns with 3.3V rail tolerance and MR interface simplicity is not required |
| TPS3808G125DBVR | 1.25V threshold, adjustable via external resistor, 200 ms timeout, 1.1 µA ICC, SOT-23-6 | Requires external resistor network; extra pin increases layout area; optimized for ultra-low-power sub-1V domains | Select only if programmable threshold and sub-µA current outweigh fixed-threshold convenience and pin count |
Compared with MAX811TEUS+T and TPS3808G125DBVR, the LM3722IM5X-2.32/NOPB delivers exact 2.32V monitoring for 2.5V rails with integrated MR pull-up and push-pull output-reducing BOM count and eliminating timing uncertainty from external components.
Availability
LM3722IM5X-2.32/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, smart energy meters, wireless sensor nodes, and battery-backed instrumentation requiring stable component supply across extended product lifecycles.
Supply support for LM3722IM5X-2.32/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and low-power design.
The LM3722IM5X-2.32/NOPB belongs to TI's microprocessor supervisory circuit family, engineered specifically for deterministic power-on reset and brown-out protection in space-constrained, battery-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage of the LM3722IM5X-2.32/NOPB?
The LM3722IM5X-2.32/NOPB has a factory-programmed reset threshold of 2.32V with a tolerance of ±20 mV over the full industrial temperature range (−40°C to +85°C). This value is laser-trimmed during production and specified in the Electrical Characteristics table of the SNVS154E datasheet under symbol VTH for part number LM3722-2.32. It is optimized for monitoring 2.5V nominal supplies within their standard 5–10% tolerance band.
Does the LM3722IM5X-2.32/NOPB require an external pull-up resistor on the RESET pin?
No, the LM3722IM5X-2.32/NOPB does not require an external pull-up resistor on the RESET pin because it features an active-low push-pull output stage. Unlike open-drain supervisors, this configuration actively drives the output low during reset and high when released, enabling direct connection to CMOS/TTL inputs without additional components. This simplifies PCB layout and eliminates potential leakage-induced floating states.
Can the LM3722IM5X-2.32/NOPB operate reliably below 2.5V supply?
Yes, the LM3722IM5X-2.32/NOPB is fully specified to operate with VCC as low as 1.0V. Its RESET output remains valid (VOL ≤ 0.3V at ISINK = 1.2 mA) down to VCC = 1V, and internal circuitry maintains accurate threshold detection and timing. This capability supports graceful shutdown and brown-out recovery in systems where the 2.5V rail may dip transiently during load surges or battery depletion.
How is the manual reset (MR) pin debounced in the LM3722IM5X-2.32/NOPB?
The LM3722IM5X-2.32/NOPB incorporates internal hardware debouncing on the MR pin, including a 22 kΩ internal pull-up resistor and glitch immunity of 100 ns. When MR is pulled below 0.25×VCC for more than 10 µs, the device asserts reset after a 2 µs propagation delay. This eliminates the need for external RC filters or firmware debouncing, enabling direct connection to mechanical switches or digital logic outputs.
Is the LM3722IM5X-2.32/NOPB compatible with MAX811-based designs?
Yes, the LM3722IM5X-2.32/NOPB is pin-compatible and functionally compatible with the MAX811 series for 2.5V supply monitoring applications. Both use SOT-23-5 packaging and provide active-low reset with manual reset input. However, the LM3722IM5X-2.32/NOPB offers tighter threshold accuracy (±20 mV vs. ±1.5%), lower supply current (6 µA vs. ~10 µA), and integrated MR pull-up - making it a drop-in upgrade in most existing MAX811 layouts without redesign.
LM3722IM5X-2.32/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM3722IM5X-2.32/NOPB FAQ
1.How can I place an order for LM3722IM5X-2.32/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3722IM5X-2.32/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3722IM5X-2.32/NOPB reliable?
The price and inventory of LM3722IM5X-2.32/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3722IM5X-2.32/NOPB is usually 5 days.
3.What payment methods are accepted for LM3722IM5X-2.32/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3722IM5X-2.32/NOPB transactions.
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4.How is shipping managed for LM3722IM5X-2.32/NOPB?
LM3722IM5X-2.32/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3722IM5X-2.32/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3722IM5X-2.32/NOPB?
For technical support, including LM3722IM5X-2.32/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3722IM5X-2.32/NOPB requirements.
6.How does Aetrix verify that LM3722IM5X-2.32/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3722IM5X-2.32/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3722IM5X-2.32/NOPB meets industry standards.
7.What is the process for return or replacement of LM3722IM5X-2.32/NOPB?
All LM3722IM5X-2.32/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3722IM5X-2.32/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3722IM5X-2.32/NOPB part is unused and in its original packaging.
Return procedure for LM3722IM5X-2.32/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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