My Inquiry
My Account
Analog Devices Inc. LTC699IS8#PBF
- Part No.:
- LTC699IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC699IS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:304
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC699IS8#PBF from Analog Devices (formerly Linear Technology) is a microprocessor supervisory circuit with integrated watchdog timer and precision 4.65V reset threshold. It provides guaranteed reset assertion down to VCC = 1V, 200ms reset active time, 1.6s watchdog timeout, SO-8 packaging, and open-drain RESET output-designed for reliable power-up/power-down sequencing in embedded controllers.
For engineers reviewing the LTC699IS8#PBF datasheet, LTC699IS8#PBF pinout, LTC699IS8#PBF application, or LTC699IS8#PBF equivalent, key selection criteria include guaranteed low-VCC reset hold, temperature-stable 4.65V threshold with 40mV hysteresis, SO-8 footprint compatibility, watchdog input transition sensitivity, and industrial-grade –40°C to +85°C operation.
Technical Context
The LTC699IS8#PBF integrates a bandgap voltage reference and precision comparator to monitor VCC against a fixed 4.65V threshold with 40mV hysteresis, ensuring immunity to supply transients. Its open-drain RESET output remains logic-low even at VCC = 1V, enabling robust microprocessor shutdown during brownout conditions.
A dedicated three-level WDI input supports watchdog functionality: transitions reset the 1.6s timeout period, static high/low states force periodic resets, and floating WDI disables the timer. The device operates from 3.0V to 5.5V and draws ≤1.5mA supply current across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V typical; ensures reset activation before 5V rail drops below microprocessor minimum operating voltage. |
| Reset Active Time | 200ms typical; guarantees sufficient hold time for CPU initialization and peripheral stabilization after power-up. |
| Watchdog Timeout | 1.6s typical; provides adequate window for firmware to service watchdog without false triggering. |
| Supply Current | ≤1.5mA max; enables low-power system monitoring without significant load on supply rails. |
| Operating Temp | –40°C to +85°C; qualified for industrial and automotive under-hood environments. |
| VCC Min for Reset Hold | 1V; maintains RESET low during deep brownout, preventing partial CPU execution. |
| RESET Output Type | Open-drain; allows flexible pull-up voltage selection and wired-OR reset bus configuration. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, 1.27mm lead pitch, RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDI) | Watchdog Input | Three-level input: transitions reset 1.6s timer; static high/low forces reset; floating disables watchdog. |
| 2 (VCC) | Power Supply Input | +3.0V to +5.5V supply; requires 0.1µF bypass capacitor near pin for noise immunity. |
| 3 (VCC) | Power Supply Input | Dual VCC pins reduce internal IR drop and improve supply rejection during transient events. |
| 4 (GND) | Ground Reference | Primary ground return path; must be connected to low-impedance system ground plane. |
| 5 (GND) | Ground Reference | Second ground pin improves thermal dissipation and reduces ground bounce in noisy systems. |
| 6 (NC) | No Connect | Internally unconnected; must remain unpopulated and unconnected on PCB. |
| 7 (GND) | Ground Reference | Third ground pin enhances EMI suppression and stabilizes internal reference accuracy. |
| 8 (RESET) | Open-Drain Reset Output | Active-low, open-drain signal; requires external pull-up; sinks ≥1.6mA at VCC = 4.25V. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset at VCC = 1V | Ensures microprocessor remains held in reset during severe brownout, eliminating erratic behavior or memory corruption. |
| 40mV Reset Threshold Hysteresis | Prevents chatter or re-triggering due to VCC ripple or noise near threshold crossing point. |
| 1.6s Watchdog Timeout with Transition Reset | Enables firmware-driven watchdog servicing via GPIO toggle, avoiding fixed-interval polling overhead. |
| SO-8 Packaging with Triple Ground Pins | Improves thermal performance and reduces ground impedance, critical for stable reference and comparator operation. |
| Industrial Temperature Range (–40°C to +85°C) | Validated operation across full range without derating, supporting deployment in harsh environmental conditions. |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 5V supply in programmable logic controller CPU modules subject to battery voltage sag and load dump transients. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and watchdog supervision for ARM Cortex-M4-based control core. Use Value: Guaranteed RESET assertion at VCC = 1V prevents partial execution during 12V battery dip to 6V, while 40mV hysteresis rejects switching regulator noise. | Use Scenario: Power management in door module ECUs exposed to wide ambient temperature swings and electrical noise from motors and relays. IC Role / Device Role / Timing Role: System supervisor ensuring safe boot and runtime integrity of Infineon AURIX TC275 microcontroller. Use Value: –40°C to +85°C qualification and triple-GND SO-8 package ensure stable reset timing and low ground bounce in high-EMI cabin environments. |
| Medical Diagnostic Instruments | Smart Energy Meters |
Use Scenario: Ensuring deterministic startup and fault recovery in portable ultrasound processors powered from Li-ion battery + DC-DC converter. IC Role / Device Role / Timing Role: Dual-function supervisor delivering both power-good monitoring and software-independent watchdog safety layer. Use Value: 200ms reset pulse and 1.6s watchdog provide margin for FPGA configuration and sensor calibration sequences before application code execution. | Use Scenario: Long-life metering platforms requiring >10-year reliability with infrequent firmware updates and no field service access. IC Role / Device Role / Timing Role: Fault-tolerant reset generator that detects undervoltage and software lockup without external components. Use Value: Minimum external component count (only 0.1µF bypass cap) reduces BOM cost and improves field reliability over 15-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX699CSA+ | 4.65V reset threshold, 200ms timeout, but no watchdog function; SO-8 package; max supply current 10µA lower. | Lacks integrated watchdog timer; requires external circuitry for software supervision. | Select when only power monitoring is needed and watchdog functionality is implemented elsewhere. |
| TPS3808G18DBVR | 1.8V reset threshold, adjustable delay, 1.8–6V supply range; SOT-23-6; no watchdog; 1.2µA quiescent current. | Not a functional replacement: different threshold voltage, no watchdog, smaller package, lower current draw. | Consider only for new designs where 4.65V threshold is not required and ultra-low power dominates. |
Compared with MAX699CSA+ and TPS3808G18DBVR, the LTC699IS8#PBF uniquely combines precision 4.65V monitoring, guaranteed 1V reset hold, and integrated watchdog in SO-8-making it the only single-chip solution for industrial microprocessor systems requiring both functions without layout changes.
Availability
LTC699IS8#PBF is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical diagnostic instruments requiring stable component supply and long-term manufacturability.
Supply support for LTC699IS8#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 LTC699IS8#PBF belongs to Linear's legacy µP supervisory product line, engineered specifically for deterministic reset generation and watchdog supervision in safety-critical embedded systems operating across extended temperature ranges.
FAQ
What is the guaranteed minimum VCC level at which LTC699IS8#PBF asserts RESET?
The LTC699IS8#PBF guarantees RESET remains asserted (active low) down to VCC = 1V. This is verified across temperature and ensures the microprocessor stays held in reset during deep brownout conditions where other supervisors may release prematurely. The specification is explicitly tested and guaranteed-not typical or nominal-and applies to all units in the LTC699IS8#PBF industrial-grade variant.
Does LTC699IS8#PBF require external components to operate?
The LTC699IS8#PBF requires only a 0.1µF ceramic bypass capacitor between VCC and GND, placed as close as possible to pins 2 and 3. No external resistors, capacitors, or timing components are needed for reset timing or watchdog functionality-the 200ms reset pulse and 1.6s watchdog timeout are internally generated and factory-trimmed. This minimal BOM reduces cost and improves reliability in space-constrained designs.
How does the WDI pin on LTC699IS8#PBF behave when left unconnected?
When the WDI pin on LTC699IS8#PBF is left floating (unconnected), the internal watchdog timer is disabled and has no effect on the RESET output. The device continues to perform power supply monitoring and reset generation normally. This behavior is intentional and documented in the datasheet: floating WDI is a defined disable state, not an undefined or fault condition.
What is the RESET output drive capability of LTC699IS8#PBF?
The LTC699IS8#PBF features an open-drain RESET output capable of sinking ≥1.6mA at VCC = 4.25V while maintaining ≤0.4V output voltage. At VCC = 1V, it sinks 10µA with ≤200mV output. This allows direct interface with standard 3.3V or 5V microprocessor reset inputs using a single pull-up resistor, and supports wired-OR configurations with multiple supervisors.
Is LTC699IS8#PBF pin-compatible with MAX699 variants?
No, LTC699IS8#PBF is not pin-compatible with MAX699 variants. While both are 8-pin supervisory circuits with similar functions, the LTC699IS8#PBF uses a unique pinout: dual VCC (pins 2 & 3), triple GND (pins 4, 5, 7), NC (pin 6), and WDI/RESET on pins 1 and 8. MAX699 typically assigns VCC, GND, RESET, and WDI to different positions. PCB redesign is required for substitution.
LTC699IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC699IS8#PBF FAQ
1.How can I place an order for LTC699IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC699IS8#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 LTC699IS8#PBF reliable?
The price and inventory of LTC699IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC699IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC699IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC699IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC699IS8#PBF?
LTC699IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC699IS8#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 LTC699IS8#PBF?
For technical support, including LTC699IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC699IS8#PBF requirements.
6.How does Aetrix verify that LTC699IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC699IS8#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 LTC699IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC699IS8#PBF?
All LTC699IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC699IS8#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 LTC699IS8#PBF part is unused and in its original packaging.
Return procedure for LTC699IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC699IS8#PBF Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
