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Analog Devices Inc. LTC692IS8#TRPBF
- Part No.:
- LTC692IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC692IS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,077
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Product details
Overview
LTC692IS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision microprocessor supervisory circuit in 8-lead SOIC package, providing guaranteed reset assertion down to VCC = 1V, 4.40V precision voltage monitoring, 200ms typical reset active time, and integrated battery backup switchover for CMOS RAM protection in automotive and industrial control systems.
For engineers reviewing the LTC692IS8#TRPBF datasheet, LTC692IS8#TRPBF pinout, LTC692IS8#TRPBF application, or LTC692IS8#TRPBF equivalent, key selection criteria include reset threshold accuracy (±0.1V), battery switchover hysteresis (20mV), VOUT dropout performance (5Ω typical), standby current (1μA max), and guaranteed operation over –40°C to +85°C.
Technical Context
The LTC692IS8#TRPBF integrates a bandgap reference, precision comparator C1 for 4.40V VCC monitoring with 40mV hysteresis, and dual power-path switching: an NMOS charge-pump switch (M1) for VCC-to-VOUT delivery (50mA, 5Ω RDS(on)) and a PMOS switch (M2) for VBATT-to-VOUT backup (125Ω, 1μA standby). It features a dedicated PFI/PFO power-fail warning path referenced to 1.3V and supports watchdog timeout via internal oscillator or external clock.
Its reset pulse generator ensures minimum 140ms active-low RESET assertion after VCC recovery, with guaranteed logic-low output down to VCC = 1V (200mV max sink voltage at 10μA). The device implements thermal limiting (~155°C shutdown) and short-circuit protection on VOUT, while CE IN/CE OUT provide fast (20ns typical) memory write-protection gating independent of VCC level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V typical, ±0.1V tolerance - ensures reliable μP reset before 5V rail drops below safe operating margin. |
| VOUT Dropout (IOUT = 50mA) | VCC – 0.50V min - enables low-voltage headroom for backed-up RAM under full load. |
| Battery Switchover Hysteresis | 20mV - prevents oscillation during VCC/VBATT crossover near 50–70mV difference. |
| Supply Current (Active) | 1.5mA max - minimizes primary supply loading in always-on supervisory applications. |
| Standby Current (VBATT mode) | 1μA max - extends lithium or supercapacitor backup life for years in memory retention. |
| RESET Propagation Delay | Guaranteed active low to VCC = 1V - holds μP in known state during brownout recovery. |
| Operating Temperature | –40°C to +85°C - qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
Package: 8-lead plastic SOIC (S8), 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Voltage output for backed-up memory | Delivers regulated power to CMOS RAM; switches between VCC (NMOS, 5Ω) and VBATT (PMOS, 125Ω) based on switchover comparator. |
| VCC | 5V main supply input | Primary power source; monitored by precision comparator C1 for reset generation and used as reference for all internal functions. |
| GND | Ground reference | Common return for all analog and digital circuitry; requires low-inductance 0.1μF bypass capacitor. |
| PFI | Power-fail input | Noninverting input to comparator C3; compares external divided voltage against internal 1.3V reference for early warning. |
| VBATT | Backup battery input | Supplies VOUT when VCC falls below VBATT −50mV; accepts 2.0V–4.0V range for Li coin cells or supercaps. |
| RESET | Active-low microprocessor reset | Open-drain output forced low during VCC undervoltage or watchdog timeout; guaranteed functional to VCC = 1V. |
| WDI | Watchdog timer input | Three-level input (high/low/floating); toggling resets internal timeout counter; floating disables watchdog. |
| PFO | Power-fail output | Open-drain output that goes low when PFI < 1.3V; used to interrupt μP prior to RESET assertion for controlled shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures deterministic μP shutdown during deep brownout without requiring external level-shifting circuitry. |
| Integrated battery switchover | Eliminates need for external diodes or MOSFETs; provides seamless transition between main and backup supplies with 20mV hysteresis. |
| Fast CE IN/CE OUT gating | 20ns propagation delay enables real-time write-protection of RAM/EEPROM during power faults, independent of VCC level. |
| Low-power backup mode | 1μA max supply current preserves battery life for >10 years in typical CMOS RAM retention applications. |
| Thermal limiting & short-circuit protection | Prevents damage during sustained overload or output fault conditions; shuts down at ~155°C with 10°C hysteresis. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V system rail in engine management systems where transient load dumps and cold-crank brownouts occur. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, RAM backup switchover, and power-fail warning to safeguard firmware integrity during voltage excursions. Use Value: Guaranteed RESET down to VCC = 1V prevents spurious reboots during cranking; 1μA standby current extends backup battery life beyond vehicle service life. | Use Scenario: Power supervision in DIN-rail mounted PLCs exposed to wide ambient temperature swings and unregulated AC/DC converter ripple. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for reset, uses PFI/PFO to trigger controlled I/O shutdown before main rail collapse. Use Value: 40mV reset hysteresis rejects noise-induced false triggers; –40°C to +85°C rating ensures reliability across factory floor environments. |
| Medical Portable Diagnostic Device | Smart Energy Meter |
Use Scenario: Maintaining SRAM data during battery swap or AC power interruption in handheld ultrasound or glucose analyzers. IC Role / Device Role / Timing Role: Battery backup manager with automatic switchover, CE OUT-controlled memory write-protection, and watchdog supervision. Use Value: VOUT switchover hysteresis (20mV) prevents oscillation during battery replacement; CE OUT forces RAM into read-only mode within 20ns of VCC drop. | Use Scenario: Securing metering data during grid instability or tamper events in utility-grade electricity meters. IC Role / Device Role / Timing Role: Precision voltage monitor and watchdog controller ensuring EEPROM write completion before power loss. Use Value: 4.40V reset threshold aligns with EN50160 voltage dip limits; PFO interrupt allows 8ms+ shutdown window before RESET assertion. |
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, 100μA active current, SO8 package | Lacks VOUT/VBATT path and CE gating; requires external diode for backup power | Select when only basic reset supervision is needed and battery backup is implemented externally. |
| TPS3823DBVR | 3.08V reset threshold, no battery backup, no PFI/PFO, 16μA supply current, SOT-23-5 | Single-supply reset only; no memory protection or power-fail warning capability | Select for cost-sensitive, space-constrained designs where only VCC monitoring is required. |
Compared with MAX692AESA+ and TPS3823DBVR, the LTC692IS8#TRPBF uniquely integrates precision reset, battery switchover, power-fail warning, and memory write-protection in one SO8 package-enabling compact, robust supervision without external components.
Availability
LTC692IS8#TRPBF is available at Aetrix Electronics and suitable for automotive ECU, industrial PLC, medical diagnostic, smart energy meter, and battery-backed memory applications requiring stable component supply across extended temperature ranges.
Supply support for LTC692IS8#TRPBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC692 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for robust microprocessor supervision in harsh environments, combining precision voltage monitoring, battery backup, power-fail warning, and watchdog functionality in single-chip solutions.
FAQ
What is the guaranteed minimum reset active time for LTC692IS8#TRPBF?
The LTC692IS8#TRPBF guarantees a minimum reset active time of 140ms after VCC rises above the reset threshold. Its typical reset active time is 200ms, and this duration is fixed (not adjustable) on the LTC692 variant. The reset pulse generator ensures this timing holds across the full –40°C to +85°C operating range, and the RESET output remains valid even when VCC drops to 1V.
Does LTC692IS8#TRPBF support battery backup for CMOS RAM, and how does switchover work?
Yes, LTC692IS8#TRPBF supports battery backup via its VBATT and VOUT pins. When VCC falls below VBATT minus 50mV, the internal PMOS switch connects VBATT to VOUT, delivering backup power with 125Ω effective resistance and 1μA max standby current. Switchover includes 20mV hysteresis to prevent oscillation, and VOUT remains stable during transition due to internal charge-pump regulation.
Can LTC692IS8#TRPBF be used with a 3.3V microprocessor system?
No, LTC692IS8#TRPBF is designed for 5V systems: its reset threshold is fixed at 4.40V, and VCC must operate between 4.5V and 5.5V per specifications. For 3.3V systems, consider the LTC694-3.3 or LTC695-3.3 variants, which feature 2.90V reset thresholds and are pin-compatible in SO8/SO16 packages - but LTC692IS8#TRPBF itself is not rated for 3.3V operation.
What is the function of the CE IN and CE OUT pins on LTC692IS8#TRPBF?
CE IN and CE OUT implement hardware write-protection for external memory. CE IN accepts a chip-enable or address-decoder signal; CE OUT replicates it with 20ns typical propagation delay when VCC is valid, but forces a logic-high state when VCC drops below the reset threshold or VBATT, thereby disabling writes to RAM/EEPROM. This ensures data integrity during power faults without software intervention - a core function of LTC692IS8#TRPBF.
How does the power-fail warning (PFI/PFO) function in LTC692IS8#TRPBF?
The PFI pin connects to an external resistor divider sensing the 5V rail; when the divided voltage falls below the internal 1.3V reference, PFO asserts low - providing an early interrupt (typically milliseconds before RESET) to initiate controlled shutdown. PFO has no built-in hysteresis, but external resistors (e.g., between PFO and PFI) can add programmable hysteresis up to 850mV, preventing noise-induced false warnings - a documented capability in LTC692IS8#TRPBF's Applications Information section.
LTC692IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC692IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC692IS8#TRPBF 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#TRPBF reliable?
The price and inventory of LTC692IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC692IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC692IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC692IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC692IS8#TRPBF?
LTC692IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC692IS8#TRPBF 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#TRPBF?
For technical support, including LTC692IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC692IS8#TRPBF requirements.
6.How does Aetrix verify that LTC692IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC692IS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC692IS8#TRPBF?
All LTC692IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC692IS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC692IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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