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Texas Instruments LM3704XCMMX-263
- Part No.:
- LM3704XCMMX-263
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3704XCMMX-263.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
LM3704XCMMX-263 from Texas Instruments (formerly National Semiconductor) is a microprocessor supervisory IC providing power-up/down/brownout reset, manual reset input, power-fail warning, and early low-line detection for embedded systems. It features a 3.08V reset threshold, 200ms reset timeout period, totem-pole RESET output, and operates from 1.0V to 5.5V supply. Used in critical µP power monitoring where reliable early fault signaling is required.
For engineers reviewing the LM3704XCMMX-263 datasheet, LM3704XCMMX-263 pinout, LM3704XCMMX-263 application, or LM3704XCMMX-263 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for industrial and automotive power supervision designs.
Technical Context
The LM3704XCMMX-263 integrates four independent comparators: one for VCC reset detection (3.08V threshold), one for PFI (1.225V reference), one for MR (1.225V threshold), and one for LLO (1.02×VRST = ~3.14V). All comparators include hysteresis (0.0032×VRST) to prevent chatter during voltage transitions.
It implements a precision internal timer that guarantees RESET assertion for exactly 200ms after VCC rises above VRST or MR releases, with valid operation down to VCC = 1.0V. The totem-pole RESET output drives high/low actively and supports ISINK up to 3.2mA at 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.5% at 25°C; ensures reliable reset initiation when main supply drops below nominal 3.3V rail. |
| Reset Timeout Period | 200ms fixed; guarantees minimum reset pulse width sufficient to initialize most 8-/16-bit microcontrollers. |
| VCC Operating Range | 1.0V to 5.5V; enables supervision of ultra-low-voltage logic rails and compatibility with 3.3V/5V systems. |
| Supply Current | 28µA typical; minimizes quiescent load on battery-backed or energy-constrained systems. |
| PFO/LLO Output Type | Totem-pole; provides rail-to-rail switching without external pull-up, simplifying interface to µP NMI or interrupt pins. |
| LLO Threshold | 1.02×VRST (~3.14V); triggers early warning 2% above reset point, enabling graceful shutdown before reset asserts. |
| MR Input Threshold | 1.225V with 56kΩ internal pull-up; allows direct connection to open-drain logic or pushbutton without external components. |
Pinout & Package
LM3704XCMMX-263 is packaged in a 9-bump micro SMD (BPA09FFB), measuring 1.412mm × 1.412mm × 0.850mm, with non-solder-mask-defined (NSMD) pads per AN-1112.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Primary supply rail monitored; RESET remains asserted until VCC ≥ 3.08V for ≥200ms. |
| GND | Ground reference | Common return for all comparators and outputs; must be low-impedance for accurate threshold tracking. |
| RESET | Active-low reset output | Totem-pole logic output; drives low during reset conditions and high otherwise; sinks up to 3.2mA. |
| PFI | Power-fail comparator input | Monitors auxiliary supply via external divider; asserts PFO low when input falls below 1.225V. |
| LLO | Low-line output | Early warning signal; goes low when VCC drops to ~3.14V, enabling NMI-based pre-reset response. |
| MR | Manual reset input | Debounced input with 1.225V threshold and internal 56kΩ pull-up; initiates 200ms reset pulse when pulled low ≥25µs. |
| NC | No-connect | Pins A1 (MR) and B2 (test) are unused; must be left floating per datasheet guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 200ms reset timeout | Eliminates need for external RC timing network; ensures consistent, repeatable reset duration across temperature and voltage. |
| ±0.5% reset threshold accuracy at 25°C | Reduces design margin requirements for 3.3V systems; avoids unnecessary over-specification of supply rails. |
| Separate 1.225V PFI comparator | Enables independent monitoring of unregulated or secondary supplies-e.g., detecting AC adapter loss before main rail collapses. |
| LLO output at 1.02×VRST | Provides deterministic early-warning window (~60mV above reset point) for firmware-controlled save-and-shutdown sequences. |
| 28µA supply current | Extends battery life in portable instruments; supports >10-year operation on coin-cell when paired with low-power µP sleep modes. |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during brownouts caused by shared 24V bus transients; LLO triggers watchdog-independent firmware save routine. Use Value: Prevents corrupted EEPROM writes during undervoltage events; 200ms timeout ensures full µP initialization before control loop resumes. | Use Scenario: Power supervision for CAN-enabled door module MCU powered from vehicle battery with cold-crank voltage dips to 6V. IC Role / Device Role / Timing Role: LM3704XCMMX-263 monitors local 3.3V LDO output; PFI tracks raw battery via resistor divider to warn of impending ignition-off transition. Use Value: LLO-generated NMI allows safe EEPROM logging of door position and window status before main reset occurs at ~3.08V. |
| Medical Patient Monitor Front-End | Smart Energy Meter MCU Subsystem |
Use Scenario: Ensuring deterministic startup and fault recovery in Class II medical devices using isolated 3.3V supply derived from mains. IC Role / Device Role / Timing Role: LM3704XCMMX-263 provides power-on reset and detects AC dropout via PFI; MR supports clinical staff-initiated soft reset. Use Value: RESET assertion down to 1.0V VCC guarantees supervision even during LDO post-regulation sag; meets IEC 60601-1 reliability requirements. | Use Scenario: Supervising metrology SoC and RTC in utility meters operating from supercapacitor backup during grid outages. IC Role / Device Role / Timing Role: LM3704XCMMX-263 monitors 3.3V rail; LLO activates at 3.14V to trigger data flush to FRAM before VCC crosses 3.08V reset threshold. Use Value: 28µA quiescent current extends supercapacitor hold-up time; micro SMD footprint saves space in compact meter PCB layout. |
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 reset threshold, 200ms timeout, open-drain RESET, 1.6V–6.0V VCC range | Lacks dedicated PFI and LLO outputs; only provides basic reset + manual reset | Select when only core reset functionality is needed and board space permits SOT-23-6 package. |
| MAX6326UT31D3+ | 3.08V reset threshold, 200ms timeout, push-pull RESET, 1.0V–5.5V VCC, no PFI/LLO | Missing power-fail and low-line outputs; includes watchdog timer not present in LM3704XCMMX-263 | Choose if watchdog capability is prioritized over dual-supply monitoring and early warning signals. |
Compared with TPS3808G33DBVR and MAX6326UT31D3+, LM3704XCMMX-263 uniquely integrates PFI, LLO, and MR in a single micro SMD package-enabling three-tiered power fault response (early warning → save → reset) without additional ICs or layout area.
Availability
LM3704XCMMX-263 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical patient monitor front-ends, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM3704XCMMX-263 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 acquired National Semiconductor in 2011 and maintains its high-reliability analog portfolio. TI specializes in precision analog ICs for industrial, automotive, and medical applications.
The LM3704 series belongs to TI's microprocessor supervisory product line, designed specifically for systems requiring multi-level power fault detection-including early warning (LLO), auxiliary supply monitoring (PFI), and deterministic reset timing-with minimal external components.
FAQ
What is the reset timeout period for LM3704XCMMX-263?
The LM3704XCMMX-263 has a factory-programmed reset timeout period of 200ms. This duration is guaranteed over the full operating temperature range (−40°C to +85°C) and supply voltage (1.0V to 5.5V). The timer starts when VCC rises above the 3.08V reset threshold or when the MR input releases, ensuring consistent reset pulse width for reliable microcontroller initialization.
Does LM3704XCMMX-263 support operation below 1.8V?
Yes, LM3704XCMMX-263 operates down to VCC = 1.0V, with RESET guaranteed active at that level. Its 3.08V reset threshold and 200ms timeout remain functional across the full 1.0V–5.5V range. This makes LM3704XCMMX-263 suitable for supervising low-voltage microcontrollers and battery-backed circuits where supply rails may sag significantly during brownout conditions.
What is the function of the LLO pin on LM3704XCMMX-263?
The LLO (Low-Line Output) pin on LM3704XCMMX-263 is an active-low early power-fail warning signal that asserts when VCC falls to 1.02×VRST (~3.14V). It provides a deterministic window-approximately 60mV above the 3.08V reset threshold-for firmware to execute critical tasks like saving state or disabling peripherals before RESET activates, enhancing system robustness in power-sensitive applications.
Can LM3704XCMMX-263 monitor a secondary power supply?
Yes, LM3704XCMMX-263 includes a dedicated PFI (Power-Fail Input) pin with a precise 1.225V internal reference. By connecting an external resistor divider from a secondary supply (e.g., unregulated 12V or battery rail) to PFI, the device asserts PFO low when that supply drops below the threshold-enabling independent monitoring of multiple rails without additional comparators or ICs.
What package type is used for LM3704XCMMX-263?
LM3704XCMMX-263 uses a 9-bump micro SMD package (NS Package Number BPA09FFB), measuring 1.412mm × 1.412mm × 0.850mm. It requires NSMD (non-solder-mask-defined) landing pads per Application Note AN-1112 and is optimized for space-constrained PCBs in portable and automotive electronics where minimal footprint is critical.
LM3704XCMMX-263 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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
LM3704XCMMX-263 FAQ
1.How can I place an order for LM3704XCMMX-263 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3704XCMMX-263 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 LM3704XCMMX-263 reliable?
The price and inventory of LM3704XCMMX-263 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3704XCMMX-263 is usually 5 days.
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4.How is shipping managed for LM3704XCMMX-263?
LM3704XCMMX-263 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3704XCMMX-263 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 LM3704XCMMX-263?
For technical support, including LM3704XCMMX-263 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3704XCMMX-263 requirements.
6.How does Aetrix verify that LM3704XCMMX-263 is sourced from the original manufacturer or authorized distributors?
All LM3704XCMMX-263 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 LM3704XCMMX-263 meets industry standards.
7.What is the process for return or replacement of LM3704XCMMX-263?
All LM3704XCMMX-263 units undergo pre-shipment inspection (PSI). If there is an issue with LM3704XCMMX-263, 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 LM3704XCMMX-263 part is unused and in its original packaging.
Return procedure for LM3704XCMMX-263:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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