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Analog Devices Inc. LTC692CN8#PBF
- Part No.:
- LTC692CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC692CN8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,689
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Product details
Overview
LTC692CN8#PBF from Analog Devices (formerly Linear Technology) is an 8-pin microprocessor supervisory IC integrating reset generation, battery backup switchover, power-fail warning, and watchdog timing. It features a 4.40V precision reset threshold, guaranteed RESET assertion down to VCC = 1V, 1.5mA max supply current, 35ns fast RAM chip-enable gating, and operates from 0°C to 70°C in PDIP-8 packaging. It is used in battery-powered controllers and automotive systems requiring reliable power monitoring.
For engineers reviewing the LTC692CN8#PBF datasheet, LTC692CN8#PBF pinout, LTC692CN8#PBF application, or LTC692CN8#PBF equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed thermal and timing behavior, and real-world use cases for microprocessor reset, CMOS RAM write protection, and early power-fail detection.
Technical Context
The LTC692CN8#PBF implements a bandgap-referenced voltage comparator (C1) for precise 4.40V ±0.15V reset threshold detection with 40mV hysteresis and <10μs response time. Its internal charge-pumped NMOS switch delivers up to 50mA to VOUT with 5Ω typical on-resistance, while a separate PMOS switch enables battery backup with 125Ω effective resistance and ≤1μA standby current.
A dedicated power-fail comparator (C3) references a stable 1.3V internal reference and drives PFO low when PFI falls below 1.30V ±0.05V; it supports external hysteresis via feedback resistors. The watchdog timer uses either an internal oscillator (100ms/1.6s timeout) or external clock input (WDI), with reset pulse generator ensuring ≥140ms active-low RESET duration after timeout or undervoltage events.
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 |
| VCC Operating Range | 4.5V to 5.5V - compatible with standard 5V logic and regulated supplies |
| Supply Current | 1.5mA max at full load - enables low-power system monitoring without burdening supply |
| Battery Backup Mode Current | 1μA max at VBATT = 2.8V, VCC = 0V - preserves backup battery life for years |
| RESET Assertion at Low VCC | Guaranteed active low down to VCC = 1V - holds μP in safe shutdown during brownout |
| CE Propagation Delay | 20–45ns at VCC = 5V, CL = 20pF - enables fast, glitch-free RAM write-protection gating |
| Power-Fail Response Time | 2μs (falling), 8μs (rising) - provides timely early-warning interrupt before system failure |
Pinout & Package
Package: 8-lead plastic DIP (N8), through-hole mounting, 0°C to 70°C operating range, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Voltage output for backed-up memory | Delivers up to 50mA from VCC via NMOS switch (5Ω RDS(on)) or from VBATT via PMOS switch (125Ω) |
| VCC | Main 5V supply input | Monitored by precision comparator C1; bypass with 0.1μF capacitor for stability |
| GND | Analog/digital ground reference | Common return path for all internal circuits and external decoupling |
| PFI | Power-fail input | Non-inverting input to comparator C3; threshold = 1.30V ±0.05V referenced to internal 1.3V bandgap |
| VBATT | Backup battery input | 2.0–4.0V range; enables automatic switchover when VCC drops 50–70mV below VBATT |
| RESET | Active-low microprocessor reset output | Open-drain, guaranteed low to 200mV at 10μA sink even at VCC = 1V |
| WDI | Watchdog input | Three-level input (high/low/floating); timeout disabled when floating, resets on each transition |
| PFO | Power-fail output | Active-low open-drain output indicating PFI < 1.30V; forced low during battery backup mode |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures deterministic μP shutdown during deep brownout, preventing undefined state or corruption |
| Fast 35ns CE gating | Enables immediate write-protection of CMOS RAM upon undervoltage, eliminating data loss windows |
| Adjustable reset timing (LTC693 only) | Not applicable to LTC692CN8#PBF - fixed 200ms typical reset active time via internal oscillator |
| Thermal limiting with shutdown | Activates at ~155°C with 10°C hysteresis, protecting device during sustained overload or short-circuit |
| Low 1μA battery standby current | Extends lithium or supercapacitor backup life to >10 years in typical CMOS RAM applications |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
|
Use Scenario: Monitoring 5V supply derived from vehicle battery during cold cranking or alternator dropout. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, RAM backup, and early PFO interrupt for graceful firmware save before power loss. Use Value: Prevents ECU configuration corruption and enables last-state logging using guaranteed RESET assertion down to VCC = 1V. |
Use Scenario: Power supervision in DIN-rail mounted PLCs exposed to industrial line transients and brownouts. IC Role / Device Role / Timing Role: Dual-role supervisor: generating 200ms reset pulse and enabling CE OUT to gate RAM writes during undervoltage. Use Value: Eliminates need for external RC reset timers and discrete backup switches, reducing BOM count and board space. |
| Medical Portable Monitor | Smart Meter with Nonvolatile Memory |
|
Use Scenario: Battery-backed operation during AC mains failure in handheld diagnostic devices. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog timer ensuring continuous memory retention and firmware integrity. Use Value: Achieves <1μA battery drain in backup mode while maintaining 50mA VOUT capability for sensor interface circuitry. |
Use Scenario: Tamper-proof energy logging in utility meters with EEPROM/NVRAM requiring write-protection during power dips. IC Role / Device Role / Timing Role: Precision voltage monitor and CE IN/CE OUT gating circuit enforcing hardware-enforced write lockout below 4.40V. Use Value: Meets IEC 62056 requirements for data integrity by guaranteeing no partial writes occur during supply instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690CPA+ | 4.65V reset threshold, no integrated battery switchover, no PFI/PFO, no watchdog timer | Lacks power-fail warning and battery backup - requires external components for same functionality | Select when only basic reset and pushbutton reset are needed; not suitable for battery-backed RAM systems |
| TPS3823-44DBVR | 4.40V reset threshold, 200ms fixed delay, no battery backup, no PFI/PFO, no CE gating | Provides only reset supervision - no memory protection or auxiliary power management capabilities | Choose for cost-sensitive 5V systems where battery backup and RAM write-protection are handled externally |
Compared with MAX690CPA+ and TPS3823-44DBVR, the LTC692CN8#PBF uniquely integrates reset, battery switchover, power-fail warning, and RAM gating in one 8-pin package - eliminating four external ICs and associated passives required to match its feature set.
Availability
LTC692CN8#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical portable monitors requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC692CN8#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC692 family was designed specifically for microprocessor-based systems needing integrated power supervision, battery backup, and fail-safe memory protection - targeting applications where reliability, low quiescent current, and guaranteed low-voltage reset are critical.
FAQ
What is the guaranteed minimum reset active time for LTC692CN8#PBF?
The LTC692CN8#PBF guarantees a minimum reset active time of 140ms after VCC rises above the 4.40V threshold, with a typical value of 200ms. This timing is fixed and non-adjustable on the LTC692CN8#PBF variant, unlike the LTC693 which supports external adjustment. The reset pulse generator ensures consistent timing across temperature and supply variations, critical for μP initialization stability.
Does LTC692CN8#PBF support battery backup for CMOS RAM?
Yes, the LTC692CN8#PBF supports battery backup for CMOS RAM via its VBATT and VOUT pins. When VCC drops 50–70mV below VBATT, the internal PMOS switch connects VBATT to VOUT, delivering power with ≤1μA standby current. In backup mode, VOUT tracks VBATT minus 0.02–0.1V, enabling multi-year retention for static RAM and nonvolatile memory.
Can LTC692CN8#PBF be used with a 3.3V microprocessor supply?
No, the LTC692CN8#PBF is specified only for 4.5V to 5.5V VCC operation and has a 4.40V reset threshold - it is not compatible with 3.3V systems. For 3.3V applications, consider the LTC694-3.3 or LTC695-3.3 variants, which feature 2.90V reset thresholds and matching voltage ranges explicitly validated for 3.3V rails.
What is the function of the CE IN and CE OUT pins on LTC692CN8#PBF?
On the LTC692CN8#PBF, CE IN accepts a logic signal (e.g., from address decoder) and CE OUT provides a buffered, gated replica. When VCC ≥ 4.40V, CE OUT follows CE IN with 20–45ns propagation delay; when VCC falls below threshold, CE OUT is forced high to disable RAM writes. This hardware-enforced write-protection prevents data corruption during power instability.
How does the power-fail warning (PFI/PFO) work on LTC692CN8#PBF?
The LTC692CN8#PBF uses an internal 1.30V reference to compare against the PFI pin voltage. When PFI falls below 1.30V ±0.05V, PFO goes low - typically configured via external resistor divider to trigger 5–10ms before VCC crosses the 4.40V reset threshold. PFO is forced low during battery backup mode, and the comparator responds in ≤8μs to rising edges and ≤2μs to falling edges.
LTC692CN8#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:
- 4.4V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC692CN8#PBF FAQ
1.How can I place an order for LTC692CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC692CN8#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 LTC692CN8#PBF reliable?
The price and inventory of LTC692CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC692CN8#PBF is usually 5 days.
3.What payment methods are accepted for LTC692CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC692CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC692CN8#PBF?
LTC692CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC692CN8#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 LTC692CN8#PBF?
For technical support, including LTC692CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC692CN8#PBF requirements.
6.How does Aetrix verify that LTC692CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC692CN8#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 LTC692CN8#PBF meets industry standards.
7.What is the process for return or replacement of LTC692CN8#PBF?
All LTC692CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC692CN8#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 LTC692CN8#PBF part is unused and in its original packaging.
Return procedure for LTC692CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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