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Analog Devices Inc. LTC699CS8#PBF
- Part No.:
- LTC699CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC699CS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:609
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Product details
Overview
LTC699CS8#PBF from Analog Devices (formerly Linear Technology) is a microprocessor supervisory circuit with integrated reset generator and watchdog timer. It provides guaranteed reset assertion down to VCC = 1V, 4.65V precision voltage monitoring, 200ms reset time delay, and 1.6s watchdog timeout - all in an SO-8 package for embedded power management in microcontroller systems.
For engineers reviewing the LTC699CS8#PBF datasheet, LTC699CS8#PBF pinout, LTC699CS8#PBF application, or LTC699CS8#PBF equivalent, key selection criteria include its open-drain RESET output, WDI three-level input behavior, temperature-stable 40mV hysteresis, and guaranteed low-VCC reset hold-down capability critical for safe microprocessor shutdown.
Technical Context
The LTC699CS8#PBF integrates a bandgap voltage reference and precision comparator to monitor VCC against a 4.65V threshold with ±40mV hysteresis, ensuring immunity to supply transients. Its reset pulse generator guarantees active-low RESET for ≥200ms after power-up and holds RESET low even when VCC drops to 1V.
A dedicated watchdog timer monitors WDI transitions with a fixed 1.6s timeout; floating WDI disables the timer, while sustained high/low states trigger periodic resets. The open-drain RESET output requires external pull-up and sinks up to 25mA at VCC = 4.25V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V typical; ensures reliable µP reset initiation at nominal +5V supply with 5% margin. |
| Reset Active Time | 200ms typical; provides sufficient stabilization window for microprocessor and peripheral power rails. |
| Watchdog Timeout | 1.6s typical; allows robust firmware supervision without excessive interrupt overhead. |
| Supply Current | 1.5mA max; enables low-power operation in battery-backed or energy-constrained systems. |
| VCC Min for RESET Hold | 1V; guarantees microprocessor remains held in reset during brown-out recovery. |
| RESET Output Type | Open-drain; supports wired-OR configuration and flexible voltage-level translation via external pull-up. |
| Hysteresis | 40mV; prevents false triggering from VCC ripple or noise near threshold. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, 1.27mm lead pitch, RoHS-compliant, surface-mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDI) | Watchdog Input | Three-level input: high/low > timeout forces RESET low; floating disables watchdog; transitions reset timer. |
| 2 (VCC) | Supply Input | +3.0V to +5.5V operation; bypass with 0.1µF capacitor near pin for noise immunity. |
| 3 (VCC) | Supply Input (duplicate) | Second VCC connection for improved power rail decoupling and current sharing. |
| 4 (NC) | No Connect | Internally unconnected; must remain floating, not tied to any net. |
| 5 (GND) | Ground | Analog/digital common reference; low-impedance return path for internal comparators and output stage. |
| 6 (GND) | Ground (duplicate) | Second GND connection for reduced ground bounce and enhanced noise rejection. |
| 7 (GND) | Ground (duplicate) | Third GND connection per package layout; improves thermal and electrical stability. |
| 8 (RESET) | Open-Drain Reset Output | Active-low signal; sinks 25mA max; requires external pull-up resistor to host logic rail. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures fail-safe microprocessor hold-down during deep brown-out, preventing undefined execution. |
| Integrated watchdog timer | Eliminates need for external timing components; reduces BOM count and board space. |
| 40mV reset threshold hysteresis | Rejects supply noise and transient dips that would otherwise cause spurious resets. |
| Dual VCC and triple GND pins | Improves power integrity and reduces ground loop impedance in noisy industrial environments. |
| SO-8 packaging | Enables automated assembly and offers better thermal performance than DIP variants. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Monitoring 5V system rails in programmable logic controllers exposed to EMI and voltage sags. IC Role / Device Role / Timing Role: Primary reset supervisor and watchdog enforcer for ARM Cortex-M based control cores. Use Value: Prevents runaway code execution during line disturbances using guaranteed 1V reset hold and 200ms debounce. | Use Scenario: Ensuring deterministic boot and runtime supervision in portable ultrasound imaging units. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-on reset and firmware health monitoring via WDI. Use Value: Meets IEC 60601-1 safety requirements through predictable 4.65V threshold and 1.6s watchdog timeout. |
| Automotive Body Control Modules | Networked Smart Sensors |
Use Scenario: Power sequencing and fault recovery in 12V-to-5V converted ECUs operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable reset generator with hysteresis-corrected threshold tracking. Use Value: Maintains 4.63V–4.66V reset window over full industrial temp range, avoiding cold-start failures. | Use Scenario: Supervising low-power IoT sensor nodes powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: Ultra-low-current (1.5mA max) supervisor enabling extended battery life. Use Value: Delivers reliable reset and watchdog functionality while consuming <2mW at 3.3V operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX699CSA+ | Same pinout, 4.63V reset threshold, 200ms timeout, but no watchdog timer; higher 2.5mA supply current. | Lacks integrated watchdog; requires external circuitry for firmware supervision. | Select when only reset function is needed and lowest possible cost is priority. |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms delay, no watchdog; push-pull RESET output; 1.6µA quiescent current. | Designed for 3.3V systems only; incompatible with 5V VCC monitoring without level shifting. | Select for ultra-low-power 3.3V applications where watchdog is implemented in firmware. |
Compared with MAX699CSA+ and TPS3808G33DBVR, the LTC699CS8#PBF uniquely combines 5V-compatible precision reset, guaranteed 1V hold-down, and integrated hardware watchdog in a single SO-8 device - eliminating external components and simplifying safety-critical designs.
Availability
LTC699CS8#PBF is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, automotive body control modules, and networked smart sensors requiring stable component supply and long-term lifecycle support.
Supply support for LTC699CS8#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC699CS8#PBF belongs to Linear's legacy µP supervisory product line, engineered specifically for robust power monitoring and watchdog enforcement in mission-critical embedded systems operating across extended temperature ranges.
FAQ
What is the minimum supply voltage at which LTC699CS8#PBF guarantees RESET remains active low?
The LTC699CS8#PBF guarantees RESET stays active low down to VCC = 1V, ensuring the microprocessor remains safely held in reset during severe brown-out conditions. This specification is verified across temperature and process corners, and is critical for systems requiring fail-safe shutdown behavior. The LTC699CS8#PBF achieves this via internal low-voltage biasing and rail-to-rail comparator design.
Does LTC699CS8#PBF require external components to operate as a reset supervisor?
No, the LTC699CS8#PBF requires only a 0.1µF bypass capacitor on VCC and an external pull-up resistor on RESET to function as a complete reset supervisor. No timing resistors or capacitors are needed - the 200ms reset delay and 1.6s watchdog timeout are fully internal. The LTC699CS8#PBF is designed for minimal external component count in space-constrained applications.
How does the WDI pin of LTC699CS8#PBF behave when left unconnected?
When the WDI pin of LTC699CS8#PBF is left floating (unconnected), the internal watchdog timer is disabled and no watchdog-related resets occur. This allows use of the device solely as a voltage monitor/reset generator. The LTC699CS8#PBF datasheet explicitly confirms floating WDI disables the watchdog function, making it safe for designs that do not require firmware supervision.
What is the RESET output structure of LTC699CS8#PBF, and how should it be interfaced?
The RESET output of LTC699CS8#PBF is an open-drain NMOS transistor, requiring an external pull-up resistor to the host logic rail (e.g., 3.3V or 5V). It sinks up to 25mA at VCC = 4.25V and pulls down to ≤0.4V. This architecture enables wired-OR configurations and voltage-level flexibility. The LTC699CS8#PBF does not provide push-pull or rail-to-rail RESET drive.
Is LTC699CS8#PBF compatible with the original MAX699 footprint and functionality?
The LTC699CS8#PBF is a direct functional upgrade to the MAX699 but adds watchdog capability absent in the MAX699. Pinout is identical in SO-8 (S8) and DIP (N8) packages, and electrical specs (reset threshold, timeout, supply current) are closely matched. However, the LTC699CS8#PBF is not a drop-in replacement if the MAX699 design relies on absence of watchdog behavior - WDI must be intentionally managed. The LTC699CS8#PBF retains full backward compatibility for reset-only use cases.
LTC699CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC699CS8#PBF FAQ
1.How can I place an order for LTC699CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC699CS8#PBF 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 LTC699CS8#PBF reliable?
The price and inventory of LTC699CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC699CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC699CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC699CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC699CS8#PBF?
LTC699CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC699CS8#PBF 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 LTC699CS8#PBF?
For technical support, including LTC699CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC699CS8#PBF requirements.
6.How does Aetrix verify that LTC699CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC699CS8#PBF 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 LTC699CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC699CS8#PBF?
All LTC699CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC699CS8#PBF, 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 LTC699CS8#PBF part is unused and in its original packaging.
Return procedure for LTC699CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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