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Texas Instruments LM3705XCMM-308/NOPB
- Part No.:
- LM3705XCMM-308/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM3705XCMM-308/NOPB.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3705XCMM-308/NOPB from Texas Instruments is a microprocessor supervisory IC that monitors VCC supply voltage, asserts active-high reset during power-up/brownout, provides early low-line warning (LLO), and supports manual reset (MR) and independent power-fail detection (PFI/PFO). It features a 3.08V reset threshold, 200ms reset timeout, totem-pole RESET output, and operates down to 1.2V VCC. Used in embedded controllers and automotive systems for reliable power sequencing and fault response.
For engineers reviewing the LM3705XCMM-308/NOPB datasheet, LM3705XCMM-308/NOPB pinout, LM3705XCMM-308/NOPB application, or LM3705XCMM-308/NOPB equivalent, this page delivers verified specifications, package mapping, functional role in power monitoring circuits, and validated alternative options - all grounded in National Semiconductor's SNVS088D documentation and TI's official product data.
Technical Context
The LM3705XCMM-308/NOPB integrates four independent comparators: one for VCC reset detection (3.08V threshold), one for PFI input (1.225V reference), one for MR input (1.225V threshold), and one for LLO generation (1.02×VRST = 3.14V threshold). Its internal timer ensures 200ms reset assertion after VCC rise or MR release.
All outputs - RESET (active-high), PFO, and LLO - are totem-pole with rail-to-rail drive capability (VOH ≥ 0.8×VCC, VOL ≤ 0.4V at 3.2mA), and the device draws only 28µA typical supply current. It supports operation across −40°C to +85°C with ±2% reset threshold accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2% over temperature - defines precise brownout detection point for 3.3V systems. |
| Reset Timeout Period | 200ms - guarantees minimum reset pulse width for safe µP initialization after power recovery. |
| RESET Output Type | Totem-pole active-high - drives high without external pull-up, compatible with standard logic inputs. |
| VCC Operating Range | 1.2V to 5.5V - enables use in low-voltage microcontrollers and battery-backed applications. |
| Supply Current | 28µA typical - minimizes quiescent load on backup supplies or energy-constrained systems. |
| LLO Threshold | 3.14V (1.02×3.08V) - triggers early non-maskable interrupt ~2% above reset threshold for graceful shutdown. |
| PFI Threshold | 1.225V ±25mV - allows monitoring of auxiliary rails (e.g., 5V or 12V via resistor divider) independently of VCC. |
Pinout & Package
LM3705XCMM-308/NOPB is housed in a 9-bump micro SMD package (NS BPA09FFB), measuring 1.412mm × 1.412mm × 0.850mm, with non-solder-mask-defined (NSMD) landing pads required for reliable assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main supply input | Power source for internal circuitry; reset assertion guaranteed down to 1.2V. |
| GND | Ground reference | Common return path for all analog comparators and digital outputs. |
| RESET | Active-high reset output | Drives high after timeout; directly interfaces µP reset input without pull-up resistor. |
| PFI | Power-fail comparator input | Accepts divided-down voltage from secondary rail; triggers PFO when below 1.225V. |
| PFO | Power-fail logic output | Active-low signal indicating auxiliary supply failure - independent of VCC status. |
| LLO | Low-line logic output | Active-low early-warning signal asserting at 3.14V to enable NMI-driven shutdown sequence. |
| MR | Manual-reset input | Debounced input with 56kΩ internal pull-up; asserts reset when pulled below 1.225V for >25µs. |
| NC | No-connect terminals (pins A1, A3) | Unused bumps - must be left unconnected per datasheet; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 3.08V reset threshold | Eliminates external resistor network; ±0.5% accuracy at 25°C ensures tight tolerance in 3.3V systems. |
| Independent LLO comparator | Provides deterministic early warning at 1.02×VRST - enables firmware-controlled save-and-shutdown before reset occurs. |
| Dedicated PFI/PFO channel | Monitors secondary supply (e.g., 5V bias rail) with 1.225V reference - isolates critical fault detection from main VCC path. |
| Internal MR pull-up (56kΩ) | Reduces BOM count; allows direct connection to open-drain logic or pushbutton without external resistor. |
| 200ms factory-set timeout | Guarantees sufficient reset hold time for slow-starting µPs or peripherals - no timing capacitor required. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 3.3V MCU supply and 5V sensor bus in harsh industrial environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: LM3705XCMM-308/NOPB acts as primary power supervisor - asserting RESET on brownout, triggering LLO for pre-failure logging, and using PFI to detect 5V rail collapse. Use Value: Prevents corrupted firmware execution during undervoltage events and enables deterministic last-action logging via NMI before reset. |
Use Scenario: Integrated into door module PCB to supervise MCU VCC and monitor 12V battery-derived 5V rail for ignition-off battery drain detection. IC Role / Device Role / Timing Role: LM3705XCMM-308/NOPB serves as dual-rail supervisor - using VCC for main MCU reset, PFI for battery voltage monitoring, and MR for service-mode reset. Use Value: Enables wake-on-LLO for low-power sleep mode entry and uses PFO to flag battery sag before system shutdown. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Ensures fail-safe operation of ARM-based controller in battery-powered infusion pump where power interruption must trigger immediate motor stop and alarm. IC Role / Device Role / Timing Role: LM3705XCMM-308/NOPB provides safety-critical reset supervision - RESET halts motor drivers, LLO initiates emergency dose rollback, and MR supports clinical reset button. Use Value: Meets IEC 60601-1 power integrity requirements by guaranteeing reset assertion down to 1.2V and providing two-stage fault signaling. |
Use Scenario: Supervises metrology SoC and RTC backup supply in utility-grade meter exposed to wide ambient temperature and line transients. IC Role / Device Role / Timing Role: LM3705XCMM-308/NOPB monitors main 3.3V rail and uses PFI to track supercapacitor charge level - PFO signals imminent backup switchover. Use Value: Extends data retention window by triggering RTC save routines 20–50ms before VCC crosses reset threshold. |
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, no LLO or PFI | Lacks early-warning LLO and independent PFI - suitable only for basic reset-only use cases | Select if only reset supervision is needed and board layout accommodates external pull-up. |
| MAX6369KA29+T | 2.93V reset threshold, 200ms timeout, totem-pole RESET, includes watchdog timer but no PFI/LLO | Offers watchdog functionality but omits dual-comparator architecture - cannot replace LLO/PFI roles | Choose when system-level watchdog supervision is prioritized over multi-rail monitoring. |
Compared with LM3705XCMM-308/NOPB, TPS3808G33DBVR and MAX6369KA29+T provide reset supervision but lack its integrated LLO early-warning and independent PFI channels - making them unsuitable for applications requiring staged power-fail response or auxiliary rail monitoring.
Availability
LM3705XCMM-308/NOPB is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across −40°C to +85°C.
Supply support for LM3705XCMM-308/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 (TI) is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of heritage in precision analog ICs and industrial-grade reliability.
The LM3705XCMM-308/NOPB belongs to TI's microprocessor supervisory circuit family, designed specifically for robust power monitoring in safety-critical and battery-sensitive applications where deterministic reset timing and multi-threshold fault detection are essential.
FAQ
What is the exact reset threshold voltage of LM3705XCMM-308/NOPB?
The LM3705XCMM-308/NOPB has a factory-programmed reset threshold of 3.08V, with ±0.5% accuracy at room temperature and ±2% accuracy over the full operating range (−40°C to +85°C). This value is laser-trimmed during manufacturing and does not require external components to set - it is fixed and specified in the SNVS088D datasheet.
Does LM3705XCMM-308/NOPB support manual reset functionality?
Yes, LM3705XCMM-308/NOPB includes a dedicated MR (Manual Reset) input with an internal 56kΩ pull-up resistor and 1.225V threshold. When MR is pulled below this voltage for longer than 25µs, it asserts RESET after a 12µs delay. The MR pin is fully debounced and can interface directly with pushbuttons or logic outputs without external components.
What is the purpose of the LLO output on LM3705XCMM-308/NOPB?
The LLO (Low-Line Output) on LM3705XCMM-308/NOPB is an active-low early-warning signal that asserts when VCC falls to 1.02×VRST (≈3.14V for this part). It provides ~2% advance notice before reset activation, enabling firmware to execute critical save operations or initiate controlled shutdown - distinct from the later-asserting RESET signal.
Can LM3705XCMM-308/NOPB monitor a supply other than VCC?
Yes, LM3705XCMM-308/NOPB includes a dedicated PFI (Power-Fail Input) pin referenced to an internal 1.225V comparator. By using an external resistor divider, users can monitor secondary supplies (e.g., 5V, 12V, or battery rails) independently of VCC - with PFO providing a separate active-low fault signal for that rail.
What package type and dimensions does LM3705XCMM-308/NOPB use?
LM3705XCMM-308/NOPB uses the 9-bump micro SMD package (NS BPA09FFB), measuring 1.412mm × 1.412mm × 0.850mm. It requires NSMD (non-solder-mask-defined) copper pads per TI Application Note AN-1112, and is optimized for ultra-compact PCB layouts in space-constrained applications like portable medical devices and automotive ECUs.
LM3705XCMM-308/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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
LM3705XCMM-308/NOPB FAQ
1.How can I place an order for LM3705XCMM-308/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3705XCMM-308/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 LM3705XCMM-308/NOPB reliable?
The price and inventory of LM3705XCMM-308/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3705XCMM-308/NOPB is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3705XCMM-308/NOPB transactions.
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LM3705XCMM-308/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3705XCMM-308/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 LM3705XCMM-308/NOPB?
For technical support, including LM3705XCMM-308/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3705XCMM-308/NOPB requirements.
6.How does Aetrix verify that LM3705XCMM-308/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3705XCMM-308/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 LM3705XCMM-308/NOPB meets industry standards.
7.What is the process for return or replacement of LM3705XCMM-308/NOPB?
All LM3705XCMM-308/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3705XCMM-308/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 LM3705XCMM-308/NOPB part is unused and in its original packaging.
Return procedure for LM3705XCMM-308/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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