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Analog Devices Inc. LTC699CN8#PBF
- Part No.:
- LTC699CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC699CN8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,649
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Product details
Overview
LTC699CN8#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 8-lead SOIC package for embedded power management in industrial controllers and automotive ECUs.
For engineers reviewing the LTC699CN8#PBF datasheet, LTC699CN8#PBF pinout, LTC699CN8#PBF application, or LTC699CN8#PBF equivalent, key selection criteria include its open-drain RESET output, WDI three-level input behavior, temperature-stable 40mV hysteresis, PSRR performance (1 ms/V reset timing, 8 ms/V watchdog), and guaranteed low-VCC reset hold capability critical for safe microprocessor shutdown.
Technical Context
The LTC699CN8#PBF integrates a bandgap-referenced precision comparator and a monostable watchdog timer on a single die. Its reset threshold is fixed at 4.65V (±5%) with 40mV hysteresis to reject supply transients, and it asserts RESET active-low when VCC drops below threshold or when WDI remains static beyond 1.6s.
RESET is an open-drain output requiring external pull-up; it remains valid down to VCC = 1V with ≤200mV sink voltage at 10µA. The WDI pin supports high/low/static disable modes and resets the watchdog timer on every logic transition - no clock source or external components are needed beyond a 0.1µF VCC bypass capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V typical; ensures reliable µP reset at nominal +5V rail with ±5% tolerance |
| Reset Active Time | 200ms typical; holds µP in reset long enough for full power stabilization post-power-up |
| Watchdog Timeout | 1.6s typical; provides sufficient margin for firmware service without false triggers |
| Supply Current | 1.5mA max; enables low-power operation in always-on supervisory applications |
| RESET Output Type | Open-drain; allows flexible pull-up voltage selection and wired-OR reset bus implementation |
| VCC Min for RESET Hold | 1V; guarantees stable µP shutdown state even during deep brownout conditions |
| PSRR (Reset Timing) | 1 ms/V; limits reset pulse jitter under supply ripple, improving system robustness |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant, JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Primary return path for internal comparators and timer; must be low-impedance |
| 2 (VCC) | Power supply input | +3.0V to +5.5V supply; requires 0.1µF ceramic bypass capacitor placed adjacent to pin |
| 3 (VCC) | Power supply input | Dual VCC connection improves noise immunity and current distribution across die |
| 4 (NC) | No connect | Internally unconnected; must remain floating or tied to GND per layout guidelines |
| 5 (GND) | Ground reference | Secondary ground pin; reduces ground bounce and improves reset timing accuracy |
| 6 (GND) | Ground reference | Third ground pin; enhances thermal dissipation and EMI suppression in high-noise environments |
| 7 (WDI) | Watchdog input | Three-level input: high/low enables watchdog; floating disables it; transitions reset timeout counter |
| 8 (RESET) | Open-drain reset output | Active-low signal; sinks up to 25mA; requires external pull-up to host logic voltage |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures µP remains held in known state during severe brownout, preventing undefined execution |
| 40mV reset threshold hysteresis | Rejects short-duration VCC glitches without spurious reset assertion |
| Zero external timing components | Eliminates BOM cost and layout area for RC networks; simplifies design validation |
| Three-level WDI interface | Enables watchdog enable/disable via pin state (high/low/floating), reducing GPIO overhead |
| Specified over 0°C to 70°C | Validated for commercial temperature range; suitable for non-automotive industrial deployments |
Applications
| Industrial PLC Controllers | Medical Diagnostic Instruments |
|---|---|
Use Scenario: Monitoring 5V power rails in programmable logic controllers exposed to variable line conditions and EMI. IC Role / Device Role / Timing Role: Primary supervisory IC providing both power-on reset and runtime watchdog supervision. Use Value: Prevents runaway code execution during transient brownouts using guaranteed 1V reset hold and 200ms reset pulse width. | Use Scenario: Ensuring deterministic startup and fault recovery in portable ultrasound and imaging systems. IC Role / Device Role / Timing Role: Dual-function supervisor: initiates controlled boot sequence and monitors firmware health via WDI toggling. Use Value: Eliminates need for discrete reset + watchdog ICs, reducing board space and qualification effort while meeting IEC 60601 safety margins. |
| Automotive Body Control Modules | Communications Base Station Controllers |
Use Scenario: Power supervision in non-safety-critical BCMs operating from vehicle battery (9–16V) with LDO-regulated 5V domain. IC Role / Device Role / Timing Role: Voltage monitor and watchdog timer for microcontroller managing door locks, lighting, and HVAC. Use Value: Maintains reset assertion through cold-crank events where VCC dips to ~1.2V, satisfying OEM brownout resilience requirements. | Use Scenario: Supervising control processors in LTE/5G remote radio units subject to thermal cycling and intermittent power loss. IC Role / Device Role / Timing Role: System-level reset arbiter and watchdog enforcer for ARM-based baseband controllers. Use Value: Provides 1.6s watchdog timeout with <10µs response time, enabling rapid fault detection before packet loss or synchronization drift occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX699CSA+ | Fixed 4.65V reset threshold; no watchdog timer; 200ms reset timeout; SO-8 package | Lacks watchdog functionality; suitable only for basic reset-only use cases | Select when watchdog is unnecessary and legacy MAX699 footprint compatibility is required |
| TPS3808G33DBVR | Adjustable reset threshold (0.4–5.0V); 200ms min reset delay; no integrated watchdog; SOT-23-6 | Smaller package and adjustable threshold but no WDI function; requires external timing resistor | Select for space-constrained designs needing threshold flexibility but no watchdog capability |
Compared with MAX699CSA+ and TPS3808G33DBVR, the LTC699CN8#PBF uniquely combines precision reset monitoring with a fully integrated, zero-component watchdog timer - making it the only option among the three that satisfies dual-supervision requirements without additional ICs or passive components.
Availability
LTC699CN8#PBF is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive body control modules, and communications base station controllers requiring stable component supply and long-term lifecycle support.
Supply support for LTC699CN8#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 LTC699 family was designed specifically for microprocessor system supervision - delivering integrated reset generation and watchdog timing in minimal footprint, targeting reliability-critical embedded applications where power integrity and firmware health monitoring are essential.
FAQ
What is the guaranteed minimum VCC level at which LTC699CN8#PBF maintains valid RESET assertion?
The LTC699CN8#PBF guarantees RESET remains asserted active-low down to VCC = 1V, with a maximum sink voltage of 200mV at 10µA load. This ensures the microprocessor stays in a defined reset state during deep brownout conditions - a key differentiator versus standard supervisors that release reset above 2.5V. This behavior is verified across the full 0°C to 70°C operating range.
Does LTC699CN8#PBF require external components to configure its reset threshold or watchdog timeout?
No, the LTC699CN8#PBF requires zero external components for either function: its 4.65V reset threshold and 1.6s watchdog timeout are factory-laser-trimmed and internally fixed. Only a 0.1µF ceramic capacitor on VCC is recommended for noise immunity. Unlike adjustable supervisors, this eliminates calibration uncertainty, BOM items, and layout sensitivity - directly supporting the "minimum external component count" design goal stated in its official features.
How does the WDI pin on LTC699CN8#PBF behave when left unconnected?
When the WDI pin of the LTC699CN8#PBF is left floating (unconnected), the internal watchdog timer is automatically disabled - RESET will not assert due to watchdog timeout. This three-level input behavior (high = enabled, low = enabled, floating = disabled) provides hardware-selectable watchdog control without requiring firmware configuration or pull resistors, simplifying system bring-up and failure mode analysis.
What is the purpose of having three GND pins and two VCC pins on the LTC699CN8#PBF SOIC package?
The LTC699CN8#PBF uses multiple GND and VCC pins to reduce power supply impedance, minimize ground bounce during RESET transitions, and improve noise rejection in electrically noisy environments. Dual VCC pins distribute supply current and lower inductance; triple GND pins provide low-impedance return paths for internal comparators and timer circuits - directly supporting its specified 10µs response time and stable operation under fast-rail transients.
Is LTC699CN8#PBF pin-compatible with MAX699CSA+?
No, LTC699CN8#PBF is not pin-compatible with MAX699CSA+. While both are SO-8 devices, their pinouts differ: LTC699CN8#PBF assigns pins 1/5/6 to GND, pins 2/3 to VCC, pin 4 to NC, pin 7 to WDI, and pin 8 to RESET; MAX699CSA+ uses pin 1 for RESET, pin 2 for VCC, pin 3 for GND, and pin 4 for WDI. Board redesign is required for substitution - though both share functional overlap in reset monitoring, only LTC699CN8#PBF integrates watchdog timing.
LTC699CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC699CN8#PBF FAQ
1.How can I place an order for LTC699CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC699CN8#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 LTC699CN8#PBF reliable?
The price and inventory of LTC699CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC699CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC699CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC699CN8#PBF transactions.
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4.How is shipping managed for LTC699CN8#PBF?
LTC699CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC699CN8#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 LTC699CN8#PBF?
For technical support, including LTC699CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC699CN8#PBF requirements.
6.How does Aetrix verify that LTC699CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC699CN8#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 LTC699CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC699CN8#PBF?
All LTC699CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC699CN8#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 LTC699CN8#PBF part is unused and in its original packaging.
Return procedure for LTC699CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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