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Analog Devices Inc. LTC692CS8#PBF
- Part No.:
- LTC692CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC692CS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
LTC692CS8#PBF from Analog Devices (formerly Linear Technology) is an 8-pin SOIC microprocessor supervisory IC integrating power-on reset, battery backup switchover, power-fail warning, and watchdog timer functions. It features a 4.40V precision reset threshold, guaranteed RESET assertion down to VCC = 1V, 1.5mA max supply current, 35ns fast CE gating for RAM write protection, and thermal limiting. It is used in battery-powered controllers and automotive systems requiring robust power monitoring.
For engineers reviewing the LTC692CS8#PBF datasheet, LTC692CS8#PBF pinout, LTC692CS8#PBF application, or LTC692CS8#PBF equivalent, key selection criteria include its fixed 200ms reset timeout (non-adjustable), absence of RESET and LOW LINE dual outputs (distinguishing it from LTC693), 8-pin SO package, and support for CMOS RAM write-protection via CE IN/CE OUT with 20ns propagation delay.
Technical Context
The LTC692CS8#PBF implements a bandgap-referenced voltage comparator (C1) for precise 4.40V ±150mV reset threshold detection with 40mV hysteresis, ensuring immunity to VCC transients. Its internal charge-pumped NMOS switch delivers up to 50mA to VOUT with 5Ω typical on-resistance and supports seamless switchover between VCC and VBATT based on a 70mV/50mV threshold/hysteresis window.
A dedicated power-fail comparator (C3) references a stable 1.3V internal reference and drives PFO low when PFI falls below 1.3V; C3 lacks built-in hysteresis but supports external hysteresis via feedback resistors. The watchdog timer uses either the internal oscillator (1.6s/100ms timeout) or external clock input (OSC IN), with WDI requiring toggling every timeout period to prevent RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V typical; ensures reliable μP reset before VCC drops below 4.25V min, critical for stable system boot. |
| Reset Active Time | 200ms typical (fixed); provides sufficient hold time for μP initialization and clock stabilization after power-up. |
| VOUT Output Capability | 50mA max at VCC – 0.5V dropout; powers backed-up CMOS RAM directly without external regulators. |
| Battery Switchover Threshold | VCC – VBATT = 70mV (power-up), 50mV (power-down); prevents oscillation during marginal supply conditions. |
| Supply Current | 1.5mA max (active), 1μA max (battery backup); enables long-life operation in battery-powered systems. |
| CE Propagation Delay | 20ns typical; enables fast, glitch-free write-protection of RAM during brownout events. |
| RESET Low Voltage @ VCC=1V | 200mV max at 10μA sink; guarantees valid logic-low signal to hold μP in reset even under severe undervoltage. |
Pinout & Package
Package: 8-lead plastic SO (SOIC-8), surface-mount, JEDEC MS-012AC, 150 mil width. Thermal resistance θJA = 180°C/W on FR4 PCB with still air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Voltage output for backed-up memory | Delivers regulated power to CMOS RAM; switches between VCC (NMOS) and VBATT (PMOS) automatically. |
| VCC | 5V main supply input | Primary power source; monitored for reset generation and used to drive internal circuits and VOUT. |
| GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for stability. |
| PFI | Power-fail input | Non-inverting input to 1.3V comparator; senses early power degradation via external resistor divider. |
| VBATT | Backup battery input | Secondary power source; activates VOUT backup path when VCC falls below VBATT by 50mV. |
| RESET | Active-low microprocessor reset output | Open-drain logic output; asserts low during power-up, brownout, or watchdog timeout. |
| WDI | Watchdog timer input | Three-level input (high/low/floating); toggling resets watchdog; floating disables timer. |
| PFO | Power-fail output | Open-drain logic output; goes low when PFI < 1.3V, signaling impending supply failure. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion at VCC = 1V | Ensures μP remains held in reset during deep brownout, preventing undefined execution or data corruption. |
| Fast 35ns CE gating of RAM chip-enable signals | Prevents spurious writes to volatile memory during power transitions with minimal timing overhead. |
| Integrated battery switchover with 20mV hysteresis | Eliminates chatter during VCC/VBATT crossover, extending backup battery life and ensuring clean transition. |
| 1μA max standby current in battery backup mode | Supports multi-year operation on coin-cell batteries for memory retention in unpowered systems. |
| Thermal limiting with ~155°C shutdown threshold | Protects device and PCB during sustained overload or short-circuit conditions without external components. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V rail derived from vehicle battery during cold cranking, where voltage dips to 3.5–4.2V. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, RAM write-protection, and early power-fail warning via PFO interrupt. Use Value: Prevents ECU firmware crash or EEPROM corruption during transient undervoltage events common in automotive environments. |
Use Scenario: Power supervision in DIN-rail mounted PLCs with redundant 24V DC input converted to 5V. IC Role / Device Role / Timing Role: Primary reset generator and battery-backed RAM protector; PFI monitors regulator output for predictive shutdown. Use Value: Enables deterministic safe-state entry and nonvolatile memory preservation during AC mains loss or converter fault. |
| Medical Portable Diagnostic Device | Smart Energy Meter with Tamper Detection |
Use Scenario: Battery-powered handheld ultrasound unit with Li-ion pack and low-power CMOS SRAM buffer. IC Role / Device Role / Timing Role: Manages switchover from main supply to backup battery, asserts RESET during brownout, and gates RAM CE. Use Value: Maintains patient data integrity and enables graceful shutdown within 8ms of power loss, meeting IEC 62304 safety requirements. |
Use Scenario: Utility meter with supercapacitor backup and tamper-detection circuitry requiring secure state retention. IC Role / Device Role / Timing Role: Provides reset supervision, PFO-triggered tamper logging, and write-protection of calibration EEPROM during power anomaly. Use Value: Guarantees accurate billing data persistence and audit trail recording even during rapid AC dropout or magnetic tampering events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690ESA+ | 4.65V reset threshold, no watchdog timer, no PFI/PFO, no CE gating; 8-pin SOIC. | Lacks power-fail warning and memory write-protection; suitable only for basic reset-only use cases. | Select only if system requires no watchdog, no battery backup, and higher reset threshold tolerance. |
| LTC693CS#PBF | 16-pin SOIC, adds RESET (active-high), LOW LINE, OSC SEL, BATT ON, and adjustable reset timeout. | Enables dual-reset signaling, external transistor drive for high-current backup, and configurable timing-requires PCB redesign. | Choose when needing active-high reset, extended pin count for diagnostics, or >50mA VOUT capability. |
Compared with MAX690ESA+ and LTC693CS#PBF, the LTC692CS8#PBF uniquely balances full-feature supervision (watchdog, PFO, CE gating, battery switchover) in an industry-standard 8-pin SOIC footprint, making it optimal for space-constrained designs requiring comprehensive yet compact power management.
Availability
LTC692CS8#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and portable medical diagnostic devices requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LTC692CS8#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. (including legacy Linear Technology products) is a global semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial, and automotive applications.
The LTC692/LTC693 product line was designed specifically for microprocessor-based systems requiring integrated power monitoring, battery backup, and system-level fault response - targeting reliability-critical embedded applications where discrete supervision solutions increase BOM count and board area.
FAQ
What is the reset timeout duration for LTC692CS8#PBF, and is it adjustable?
The LTC692CS8#PBF has a fixed reset active time of 200ms typical (140ms minimum), determined by its internal oscillator. Unlike the LTC693CS#PBF, this timeout is not adjustable via external components or pins. This fixed timing simplifies design for applications requiring consistent, predictable reset hold duration without configuration overhead. The LTC692CS8#PBF achieves this using an internal RC oscillator, eliminating the need for external timing capacitors while maintaining tight specification over temperature.
Does LTC692CS8#PBF support both active-high and active-low reset outputs?
No, the LTC692CS8#PBF provides only a single active-low RESET output. It does not include the complementary active-high RESET output found on the pin-compatible but functionally enhanced LTC693CS#PBF. This distinction is clearly documented in the Product Selection Guide table on page 3 of the datasheet, which lists "X" under RESET for LTC692 and "✓" for LTC693. Therefore, systems requiring dual-polarity reset signaling must use LTC693CS#PBF or add external logic.
Can LTC692CS8#PBF drive more than 50mA to VOUT in battery backup mode?
No, the LTC692CS8#PBF's VOUT is rated for up to 50mA from VCC and only 250μA from VBATT in backup mode, with a 125Ω PMOS switch impedance. Attempting higher loads causes excessive dropout and potential instability. For >50mA applications, the datasheet explicitly recommends using the LTC693CS#PBF with its BATT ON output to drive an external PNP transistor, or adding a Schottky diode from VCC to VOUT - neither option is supported natively by the LTC692CS8#PBF.
How does the power-fail comparator (PFI/PFO) function in LTC692CS8#PBF?
The LTC692CS8#PBF's PFI pin connects to an internal 1.3V comparator (C3); when PFI voltage falls below 1.3V, PFO asserts low. This allows early warning of supply decay before the 4.40V reset threshold is breached. The comparator has no built-in hysteresis, but external hysteresis can be added using resistors between PFO and PFI. The PFI input draws only ±25nA, enabling high-impedance sensing networks without loading error - a key advantage over older supervisory ICs.
What is the maximum allowable voltage on the VBATT pin of LTC692CS8#PBF?
The absolute maximum rating for VBATT is 6.0V, but the recommended operating range is 2.0V to 4.0V per the Electrical Characteristics table on page 3. Exceeding 4.0V risks violating the battery switchover comparator's design assumptions and may cause unreliable VOUT switching or increased leakage. For lithium coin cells (3V) or rechargeable Li-ion (3.6–4.2V), operation within 2.0–4.0V ensures specified performance, including 1μA max standby current and proper switchover hysteresis.
LTC692CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC692CS8#PBF FAQ
1.How can I place an order for LTC692CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC692CS8#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 LTC692CS8#PBF reliable?
The price and inventory of LTC692CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC692CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC692CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC692CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC692CS8#PBF?
LTC692CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC692CS8#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 LTC692CS8#PBF?
For technical support, including LTC692CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC692CS8#PBF requirements.
6.How does Aetrix verify that LTC692CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC692CS8#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 LTC692CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC692CS8#PBF?
All LTC692CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC692CS8#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 LTC692CS8#PBF part is unused and in its original packaging.
Return procedure for LTC692CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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