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Analog Devices Inc. LTC692IS8#PBF
- Part No.:
- LTC692IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC692IS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
LTC692IS8#PBF from Analog Devices (formerly Linear Technology) is an industrial-grade microprocessor supervisory IC in 8-lead SOIC package, integrating precision 4.40V reset threshold, battery switchover (VCC/VBATT), RAM write-protection gating (CE IN/CE OUT), power-fail warning (PFI/PFO), and watchdog timer with internal oscillator. It guarantees RESET assertion down to VCC = 1V and delivers up to 50mA VOUT with <5Ω on-resistance for CMOS RAM backup in automotive and industrial control systems.
For engineers reviewing the LTC692IS8#PBF datasheet, LTC692IS8#PBF pinout, LTC692IS8#PBF application, or LTC692IS8#PBF equivalent, this page provides verified functional specifications, validated pin roles, temperature-stable reset timing (–40°C to 85°C), battery switchover hysteresis (20mV), and real-world memory protection use cases - all confirmed against Linear Technology's official 0692fb datasheet.
Technical Context
The LTC692IS8#PBF implements a dual-path power management architecture: a charge-pumped NMOS switch (M1) delivers low-dropout VOUT from VCC during normal operation, while a PMOS switch (M2) enables seamless battery backup when VCC falls below VBATT by 50mV (power-down) or rises above VBATT by 70mV (power-up), with 20mV hysteresis to prevent chatter. Its internal bandgap reference feeds three independent comparators (C1 for reset, C2 for battery switchover, C3 for PFI) and a watchdog timer with selectable timeout periods (100ms/1.6s typical).
Reset assertion is guaranteed at VCC = 1V via dedicated low-voltage circuitry; CE OUT propagation delay is 20ns typical; and PFI comparator response time is 2μs (falling) / 40μs (rising) with 1.3V internal reference. All critical parameters - reset threshold (4.40V ±0.15V), supply current (1.5mA max), and standby current (1μA max) - are specified over the full –40°C to +85°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V typical, 4.25–4.50V min/max - ensures reliable μP reset before 5V rail collapse into invalid logic region. |
| VOUT Output Current | 50mA max - sufficient to power standard CMOS RAM without external boost, with 5Ω typical on-resistance. |
| Battery Switchover Hysteresis | 20mV - prevents oscillation during VCC/VBATT crossover in noisy or slow-decay power environments. |
| Supply Current (Active) | 1.5mA maximum - enables low-power system monitoring without burdening primary 5V rail. |
| Standby Current (Battery Mode) | 1μA maximum - extends backup battery life for years in memory-retention applications. |
| RESET Assertion at Low VCC | Guaranteed active low down to VCC = 1V - holds μP in safe shutdown during deep brownout. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive, factory-floor PLC, and outdoor embedded systems. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, gull-wing leads, RoHS-compliant lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Voltage output for backed-up memory | Delivers regulated 5V-equivalent to CMOS RAM; switches between VCC (NMOS) and VBATT (PMOS) based on comparator C2 decision. |
| VCC | Main 5V supply input | Primary power source; monitored by comparator C1 for reset generation; requires 0.1μF local bypass. |
| GND | Analog/digital ground reference | Common return for all internal circuits and external decoupling; must be low-impedance connection. |
| PFI | Power-fail input (non-inverting) | Accepts voltage divider signal; compared to 1.3V internal reference to generate early PFO warning. |
| VBATT | Backup battery input | Supplies VOUT during main power loss; operating range 2.0V–4.0V; connects to GND if unused. |
| RESET | Active-low microprocessor reset output | Open-drain logic output; sinks ≥1.6mA at 4.25V; remains asserted down to VCC = 1V. |
| WDI | Watchdog timer input | Three-level input (high/low/floating); toggling resets timeout; floating disables watchdog. |
| PFO | Power-fail output | Active-low open-drain output; goes low when PFI < 1.3V; forced low during battery backup mode. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures deterministic μP shutdown during severe brownout, preventing undefined state corruption. |
| Integrated RAM write-protection gating | CE IN/CE OUT pair blocks memory writes when VCC drops below reset threshold - no external logic required. |
| Adjustable reset timing (LTC693 only) | Not applicable to LTC692IS8#PBF - fixed 200ms typical reset active time per datasheet Table 2. |
| Thermal limiting with hysteresis | Shuts down at ~155°C; restarts at ~145°C - protects against sustained overload without latch-up. |
| Low-noise PFI comparator | 1.3V reference with ±0.05V tolerance and 0.3mV/V PSRR - rejects supply ripple for stable power-fail detection. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V supply derived from vehicle battery during cold cranking, where voltage dips to 6–7V unregulated and may sag below 4.5V. IC Role / Device Role / Timing Role: LTC692IS8#PBF asserts RESET before VCC enters invalid logic region and gates CE OUT to freeze RAM writes during transient brownout. Use Value: Prevents ECU firmware corruption and preserves calibration data across repeated engine start cycles. |
Use Scenario: Power supervision for distributed I/O modules in factory automation, exposed to 24V DC bus fluctuations and EMI. IC Role / Device Role / Timing Role: LTC692IS8#PBF monitors VCC, triggers PFO for graceful I/O shutdown, and maintains VOUT from VBATT to retain configuration registers during mains failure. Use Value: Enables >10-second safe shutdown window and eliminates need for supercapacitor-based hold-up circuits. |
| Medical Portable Diagnostic Device | Smart Meter with Tamper-Resistant Memory |
Use Scenario: Battery-powered handheld ultrasound unit requiring persistent RAM retention during AC adapter disconnection. IC Role / Device Role / Timing Role: LTC692IS8#PBF detects VCC drop, switches VOUT to VBATT within 20μs, and forces CE OUT high to lock memory writes until stable power resumes. Use Value: Guarantees zero data loss during hot-swap battery replacement and meets IEC 60601-1 power interruption requirements. |
Use Scenario: Utility meter with nonvolatile RAM storing billing data and tamper logs, subject to grid instability and intentional power cycling attacks. IC Role / Device Role / Timing Role: LTC692IS8#PBF uses WDI to verify μP activity and asserts RESET if watchdog is not serviced, while PFO triggers secure erase upon detected power anomaly. Use Value: Meets ANSI C12.1 and IEC 62053-21 anti-tampering mandates for memory integrity under adversarial conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | 4.65V reset threshold, no integrated battery switchover, no CE gating, 100μA supply current | Lacks RAM write-protection and seamless battery backup - requires external diode-OR and logic for equivalent functionality | Select only if 4.65V threshold matches legacy design and battery backup is handled externally |
| TPS3823-44DBVR | 4.40V reset threshold, no battery switchover, no PFI/PFO, no CE gating, 15μA supply current | Basic reset supervisor only - no power-fail warning, no memory protection, no watchdog | Choose for cost-sensitive, low-power applications where only reset assertion is required |
Compared with MAX692AESA+ and TPS3823-44DBVR, the LTC692IS8#PBF uniquely integrates battery switchover, RAM write-protection gating, and power-fail warning in a single 8-pin SOIC - reducing BOM count by ≥4 discrete components and eliminating layout complexity associated with external diode-OR and comparator networks.
Availability
LTC692IS8#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC692IS8#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 LTC692 product line was designed specifically for robust microprocessor system supervision in harsh environments - delivering guaranteed reset assertion, battery-backed memory integrity, and early power-fail warning in minimal footprint packages.
FAQ
What is the guaranteed minimum VCC level at which LTC692IS8#PBF asserts RESET?
The LTC692IS8#PBF guarantees RESET remains active low down to VCC = 1V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables of the official 0692fb datasheet. This ensures deterministic microprocessor shutdown during deep brownout conditions where other supervisors fail to assert reset, preserving system state integrity. The LTC692IS8#PBF achieves this via dedicated low-voltage circuitry independent of the main bandgap reference.
Does LTC692IS8#PBF support adjustable reset timeout like the LTC693?
No, the LTC692IS8#PBF has a fixed reset active time of 200ms typical (140ms minimum), as stated in the Electrical Characteristics table and Applications Information section. Adjustable reset timing is exclusive to the 16-pin LTC693 variant, which uses external components to set duration. The LTC692IS8#PBF's fixed timing simplifies design for applications requiring consistent, predictable reset hold-off without external components.
Can LTC692IS8#PBF drive CMOS RAM directly without external components?
Yes, the LTC692IS8#PBF delivers up to 50mA from VOUT with a typical on-resistance of 5Ω, sufficient to power standard 62128/62256-style CMOS RAMs. Its integrated CE IN/CE OUT gating circuit also directly controls RAM chip-enable inputs without external logic, as shown in Figure 7 of the datasheet. The LTC692IS8#PBF thus eliminates need for external transistors, diodes, or comparators in basic memory backup implementations.
What is the battery switchover threshold hysteresis for LTC692IS8#PBF?
The LTC692IS8#PBF exhibits 20mV hysteresis between power-up (VCC – VBATT = +70mV) and power-down (VCC – VBATT = +50mV) switchover points, as specified in the Electrical Characteristics table. This prevents oscillatory switching when VCC and VBATT voltages are closely matched - a critical feature for stable operation with aging batteries or noisy power rails. The hysteresis is inherent to comparator C2 and requires no external components.
Is LTC692IS8#PBF compatible with lithium backup batteries?
Yes, the LTC692IS8#PBF is explicitly designed for lithium battery compatibility: its PMOS battery switch injects no substrate current into VBATT, avoiding unintended charging that could damage Li-ion cells. The datasheet confirms VBATT operating range of 2.0V–4.0V aligns with common lithium coin-cell and polymer pack voltages, and standby current is limited to 1μA maximum - enabling multi-year backup life. The LTC692IS8#PBF thus safely supports lithium-based memory retention without external protection circuitry.
LTC692IS8#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:
- 4.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC692IS8#PBF FAQ
1.How can I place an order for LTC692IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC692IS8#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 LTC692IS8#PBF reliable?
The price and inventory of LTC692IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC692IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC692IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC692IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC692IS8#PBF?
LTC692IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC692IS8#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 LTC692IS8#PBF?
For technical support, including LTC692IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC692IS8#PBF requirements.
6.How does Aetrix verify that LTC692IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC692IS8#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 LTC692IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC692IS8#PBF?
All LTC692IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC692IS8#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 LTC692IS8#PBF part is unused and in its original packaging.
Return procedure for LTC692IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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