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Texas Instruments LM3705XDMM-232/NOPB
- Part No.:
- LM3705XDMM-232/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3705XDMM-232/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,044
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Product details
Overview
LM3705XDMM-232/NOPB from Texas Instruments is a microprocessor supervisory IC designed for critical power monitoring in embedded systems. It provides active-high RESET output, 3.08V reset threshold, 1600ms reset timeout period, and integrated power-fail (PFI/PFO), low-line (LLO), and manual-reset (MR) functions. Used in automotive ECUs and industrial controllers to prevent code corruption during brownout.
For engineers reviewing the LM3705XDMM-232/NOPB datasheet, LM3705XDMM-232/NOPB pinout, LM3705XDMM-232/NOPB application, or LM3705XDMM-232/NOPB equivalent, this page delivers verified electrical parameters, package mapping to micro SMD (9-bump), functional pin roles, real-world use cases, and two validated alternative parts with documented technical differences.
Technical Context
The LM3705XDMM-232/NOPB integrates three independent comparators: one for VCC monitoring (reset threshold = 3.08V ±0.5% at 25°C, ±2% over −40°C to +85°C), one for PFI input referenced to 1.225V, and one for LLO triggering at 1.02×VRST. All comparators include hysteresis (0.0032×VRST) to prevent chatter during voltage transitions.
Its totem-pole RESET output drives high after timeout (1600ms) when VCC rises above threshold or MR releases; it asserts high only when VCC ≥1.2V and remains valid down to 1.2V supply. The internal 56kΩ MR pull-up enables direct logic-level interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.5% at 25°C; ensures reliable detection of VCC drop below safe operating level for 3.3V systems. |
| Reset Timeout Period | 1600ms; guarantees processor remains held in reset long enough for stable clock and supply recovery before boot. |
| RESET Output Type | Active-high totem-pole; eliminates need for external pull-up and supports direct connection to µP reset input requiring high-active assertion. |
| VCC Supply Current | 28 µA typical; enables battery-backed operation for >10 years in low-power monitoring applications. |
| PFI Threshold Voltage | 1.225V ±25mV; allows precise early warning of auxiliary supply failure via external resistor divider. |
| LLO Threshold | 1.02 × VRST (≈3.14V); triggers non-maskable interrupt 2% above reset point to enable graceful shutdown before reset activates. |
| Operating Temperature | −40°C to +85°C; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
LM3705XDMM-232/NOPB uses the 9-bump micro SMD package (NS BPA09FFB), footprint 1.412mm × 1.412mm × 0.850mm, NSMD pad layout required per AN-1112. No solder mask defined pads ensure reliable reflow attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main supply input | Power source for internal comparators and RESET driver; operates from 1.2V to 5.5V. |
| GND | Ground reference | Common return path for all analog and digital circuitry; must be low-impedance connection. |
| RESET | Active-high reset output | Drives high after timeout; asserts high during power-up, brownout, or MR activation - directly interfaces µP reset pin. |
| PFI | Power-fail comparator input | Accepts divided-down voltage from secondary supply; comparator trips when input falls below 1.225V. |
| PFO | Power-fail logic output | Open-drain compatible (pulled high externally); goes low when PFI < 1.225V - signals imminent supply collapse. |
| LLO | Low-line logic output | Early warning indicator; goes low when VCC drops to 1.02×VRST - used for NMI generation prior to reset. |
| MR | Manual-reset input | Active-low input with internal 56kΩ pull-up; asserts reset when pulled below 1.225V for >25µs. |
| NC | No-connect terminals | Pins A1, A2, A3, B2 are unconnected die pads; must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 1600ms timeout | Eliminates external timing capacitor; ensures consistent reset duration across production units and temperature. |
| ±0.5% reset threshold accuracy at 25°C | Reduces design margin needed for 3.3V systems - enables tighter supply tolerance without false resets. |
| Separate PFI comparator with 1.225V reference | Allows independent monitoring of backup rail or analog supply without loading main VCC path. |
| LLO output at 1.02×VRST with hysteresis | Provides deterministic early-warning window (≈60mV above reset point) for firmware-controlled shutdown. |
| 28 µA quiescent current | Supports always-on supervision in energy-constrained nodes - e.g., battery-powered telematics modules. |
Applications
| Automotive Engine Control Unit | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V MCU rail in engine ECU exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Supervises VCC integrity, asserts RESET on brownout, and triggers LLO-based NMI for fuel cut-off sequencing. Use Value: Prevents erratic MCU behavior during transient dips; 1600ms timeout ensures full regulator recovery before restart. |
Use Scenario: Embedded in DIN-rail mounted PLC module powering isolated analog inputs and CAN transceivers. IC Role / Device Role / Timing Role: Detects failure of auxiliary 12V DC-DC converter via PFI input while guarding main 3.3V logic supply. Use Value: Enables dual-supply fault isolation - PFO signals converter failure before VCC drops, allowing safe I/O disable. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU Subsystem |
Use Scenario: Ensures fail-safe shutdown of motor drivers when battery voltage decays below operational minimum. IC Role / Device Role / Timing Role: Uses MR input tied to emergency stop button; RESET holds MCU in known state until operator confirms reset. Use Value: Meets IEC 62304 safety requirement for controlled reset initiation - no spurious release due to contact bounce. |
Use Scenario: Supervises metrology SoC and RTC backup supply in utility meter operating on primary AC and supercapacitor. IC Role / Device Role / Timing Role: LLO warns of impending brownout to save metering data to EEPROM before RESET activates. Use Value: Guarantees data integrity across 1600ms grace period - sufficient time to complete flash write cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3V fixed reset threshold; 200ms timeout; open-drain RESET; no LLO or PFI outputs. | Lacks early warning capability - suitable only where basic reset suffices and auxiliary monitoring is handled elsewhere. | Select when system already includes discrete PFI/LLO circuitry and requires smaller SOT-23 footprint. |
| MAX6369KA23+T | 3.08V reset threshold; 1400ms timeout; includes watchdog timer; no PFI input; LLO function absent. | Provides watchdog functionality but omits dedicated power-fail comparator - limits multi-rail monitoring flexibility. | Choose when firmware-level watchdog supervision is mandatory and PFI monitoring is unnecessary. |
Compared with LM3705XDMM-232/NOPB, TPS3808G33DBVR reduces feature count but improves board density, while MAX6369KA23+T adds watchdog capability at the cost of losing PFI and LLO - neither offers identical triple-comparator supervision with factory-set 1600ms timing.
Availability
LM3705XDMM-232/NOPB is available at Aetrix Electronics and suitable for automotive engine control, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM3705XDMM-232/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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and microcontrollers.
The LM3705XDMM-232/NOPB belongs to TI's microprocessor supervisory circuit family, engineered for robust power integrity monitoring in safety-critical embedded systems where deterministic reset behavior and multi-rail fault detection are essential.
FAQ
What is the exact reset threshold voltage of LM3705XDMM-232/NOPB and how tightly is it specified?
The LM3705XDMM-232/NOPB has a factory-trimmed reset threshold of 3.08V, with ±0.5% accuracy at 25°C and ±2% over the full −40°C to +85°C operating range. This precision ensures reliable detection of brownout in 3.3V systems without requiring external calibration or margining. The value is laser-trimmed during manufacturing and documented in the SNVS088D datasheet.
Does LM3705XDMM-232/NOPB support active-high reset assertion, and what is its drive strength?
Yes, LM3705XDMM-232/NOPB features an active-high totem-pole RESET output capable of sourcing up to 800µA at VCC −1.5V (for VCC > 4.5V) and sinking 3.2mA at 0.4V. This eliminates the need for an external pull-up resistor and allows direct interface with µP reset pins requiring high-active assertion - a key distinction from the LM3704's active-low RESET.
How does the Low-Line Output (LLO) function in LM3705XDMM-232/NOPB, and what is its threshold relationship to the reset point?
The LLO output in LM3705XDMM-232/NOPB goes low when VCC falls to 1.02×VRST (≈3.14V for 3.08V threshold), providing a deterministic early warning window ~60mV above the reset activation point. This enables firmware to initiate graceful shutdown - such as saving state or disabling actuators - before the hard reset engages, improving system reliability.
Can LM3705XDMM-232/NOPB monitor a secondary power supply, and how is that implemented?
Yes, LM3705XDMM-232/NOPB includes a dedicated Power-Fail Input (PFI) comparator referenced to an internal 1.225V threshold. An external resistor divider scales the secondary supply (e.g., 12V or 5V rail) to match this reference, allowing independent fault detection without loading the main VCC rail - confirmed in Figure 4 and Table 1 of SNVS088D.
What package type and mounting guidance applies to LM3705XDMM-232/NOPB?
LM3705XDMM-232/NOPB uses the 9-bump micro SMD package (NS BPA09FFB), 1.412mm × 1.412mm, requiring NSMD (non-solder-mask-defined) copper pads per TI Application Note AN-1112. The device is sensitive to IR/visible light; shielding from ambient illumination is recommended during PCB operation to prevent parametric shift.
LM3705XDMM-232/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 High
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
LM3705XDMM-232/NOPB FAQ
1.How can I place an order for LM3705XDMM-232/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3705XDMM-232/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 LM3705XDMM-232/NOPB reliable?
The price and inventory of LM3705XDMM-232/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3705XDMM-232/NOPB is usually 5 days.
3.What payment methods are accepted for LM3705XDMM-232/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3705XDMM-232/NOPB transactions.
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LM3705XDMM-232/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3705XDMM-232/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 LM3705XDMM-232/NOPB?
For technical support, including LM3705XDMM-232/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3705XDMM-232/NOPB requirements.
6.How does Aetrix verify that LM3705XDMM-232/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3705XDMM-232/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 LM3705XDMM-232/NOPB meets industry standards.
7.What is the process for return or replacement of LM3705XDMM-232/NOPB?
All LM3705XDMM-232/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3705XDMM-232/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 LM3705XDMM-232/NOPB part is unused and in its original packaging.
Return procedure for LM3705XDMM-232/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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