My Inquiry
My Account
Analog Devices Inc. LTC692CS8#TRPBF
- Part No.:
- LTC692CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC692CS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC692CS8#TRPBF from Analog Devices (formerly Linear Technology) is an 8-pin SOIC microprocessor supervisory IC with integrated battery backup switching, power-fail warning, watchdog timer, and RAM write-protection gating. It features a 4.40V precision reset threshold, guaranteed RESET assertion down to VCC = 1V, 1.5mA max supply current, 35ns CE gating delay, and 200ms typical reset active time. It is used in battery-powered controllers and automotive systems requiring robust power monitoring and memory integrity.
For engineers reviewing the LTC692CS8#TRPBF datasheet, LTC692CS8#TRPBF pinout, LTC692CS8#TRPBF application, or LTC692CS8#TRPBF 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 SOIC package, and support for CMOS RAM write-protection via CE IN/CE OUT logic gating.
Technical Context
The LTC692CS8#TRPBF 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 to VBATT when VCC drops below VBATT by ≥50mV.
A dedicated power-fail comparator (C3) references a stable 1.3V internal reference and drives PFO low when PFI falls below 1.3V; C3 has no built-in hysteresis but supports external hysteresis via feedback. The watchdog timer uses either the internal oscillator (1.6s/100ms timeout) or external clock input (OSC IN), with WDI requiring toggling within timeout to prevent forced RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V typical (±150mV over temp); ensures reliable μP reset before 5V rail collapse |
| Reset Active Time | 200ms typical (min 140ms); fixed duration, non-adjustable - differs from LTC693 |
| VOUT Output Capability | 50mA max at VCC – 0.5V dropout; powers backed-up CMOS RAM directly |
| Battery Switchover Threshold | VCC – VBATT ≥ 50mV (power-down), ≥70mV (power-up); includes 20mV hysteresis |
| Supply Current | 1.5mA max (active), 1μA max (battery backup mode); enables long-life battery operation |
| CE Gating Delay | 35ns max propagation; fast write-protection activation during brownout |
| WDI Minimum Pulse Width | 200ns; supports high-frequency watchdog servicing without timing margin risk |
Pinout & Package
Package: 8-lead plastic SO (SOIC-8), surface-mount, JEDEC MS-012, 3.9mm × 4.9mm body, 1.27mm pitch.
| 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) |
| VCC | Main 5V supply input | Primary power source; monitored for reset; requires 0.1μF bypass capacitor |
| GND | Ground reference | Common return for all analog and digital circuitry; critical for comparator accuracy |
| PFI | Power-fail input | Non-inverting input to 1.3V-referenced comparator; senses early rail collapse |
| VBATT | Backup battery input | Source for VOUT during main supply loss; operates 2.0V–4.0V |
| RESET | Active-low microprocessor reset output | Guaranteed logic low down to VCC = 1V; min 140ms pulse width |
| WDI | Watchdog input | Three-level input (high/low/floating); floating disables watchdog timer |
| PFO | Power-fail output | Active-low open-drain signal; asserts when PFI < 1.3V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures μP remains held in reset during deep brownout, preventing undefined state execution |
| Fast 35ns CE gating | Enables immediate write-protection of RAM during supply instability, eliminating data corruption windows |
| Integrated battery switchover | Eliminates need for external diodes or MOSFETs; reduces BOM count and layout area |
| 1.3V precision PFI reference | Allows accurate, temperature-stable power-fail warning independent of VCC drift |
| Thermal limiting protection | Shuts down VOUT switch at ~155°C with 10°C hysteresis; prevents damage under sustained overload |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring 5V system rail in engine compartment where temperature swings and load dump cause transient undervoltage. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, RAM write-protection, and early power-fail warning before VCC drops below 4.40V. Use Value: Prevents ECU firmware crash or corrupted calibration data during ignition cycling or alternator failure. |
Use Scenario: Power supervision in DIN-rail mounted PLC with battery-backed SRAM retaining I/O configuration during AC mains interruption. IC Role / Device Role / Timing Role: Dual-role device: generates 200ms reset pulse on brownout and gates CE signal to freeze RAM writes until stable power returns. Use Value: Eliminates need for discrete reset generator + OR-gate + backup switch, reducing board space by >30%. |
| Medical Portable Infusion Pump | Smart Meter with Tamper-Resistant Memory |
Use Scenario: Battery-powered infusion pump requiring fail-safe shutdown and memory retention when primary Li-ion drops below safe operating voltage. IC Role / Device Role / Timing Role: Monitors VCC and VBATT simultaneously; asserts RESET and forces CE OUT high to lock dose history in EEPROM before power loss. Use Value: Meets IEC 62304 Class C software safety requirements for deterministic shutdown and data integrity. |
Use Scenario: Utility smart meter using nonvolatile RAM to store billing data; must survive grid outage and tamper attempts. IC Role / Device Role / Timing Role: Provides watchdog timer (WDI serviced by metrology MCU) and PFO-triggered interrupt to save last valid kWh reading before RESET. Use Value: Enables secure, audit-trail-compliant data retention without external FRAM or backup capacitor bank. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC693CS8#TRPBF | 16-pin SOIC; adds RESET (active-high), LOW LINE, OSC SEL, and adjustable reset timeout via external capacitor | Supports dual-reset signaling and configurable timing; required for designs needing RESET/LOW LINE separation or timeout tuning | Select when dual-output reset signaling or programmable reset duration is mandatory; not pin-compatible |
| MAX690ESA+ | 8-pin SOIC; 4.65V reset threshold; no integrated battery switchover or CE gating; higher 2.5mA supply current | Lacks RAM write-protection and battery backup functions; requires external components for equivalent functionality | Select only for legacy drop-in replacement where battery backup and CE gating are handled externally |
Compared with LTC692CS8#TRPBF, LTC693CS8#TRPBF offers expanded functionality at the cost of larger footprint and pin count, while MAX690ESA+ provides basic reset-only supervision with higher quiescent current and no integrated memory protection - making LTC692CS8#TRPBF the optimal balance of integration, size, and low-power performance for new designs requiring full supervisory capability in 8-pin SOIC.
Availability
LTC692CS8#TRPBF is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, portable medical devices, and smart meters requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LTC692CS8#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for the LTC® family of precision analog and power management ICs.
The LTC692/LTC693 product line was designed specifically for microprocessor-based systems requiring integrated power monitoring, battery backup, and memory protection - eliminating discrete solutions in space-constrained embedded applications.
FAQ
What is the reset voltage threshold of the LTC692CS8#TRPBF?
The LTC692CS8#TRPBF has a nominal reset voltage threshold of 4.40V, with a guaranteed range of 4.25V to 4.50V over the full operating temperature range. This threshold is set by an internal bandgap-referenced comparator and includes 40mV of hysteresis to prevent false triggering from VCC noise or transients. The LTC692CS8#TRPBF guarantees RESET remains asserted even when VCC drops as low as 1V, ensuring reliable microprocessor hold-down during deep brownout conditions.
Does the LTC692CS8#TRPBF support adjustable reset timeout?
No, the LTC692CS8#TRPBF does not support adjustable reset timeout. Its reset active time is fixed at 200ms typical (minimum 140ms) and is determined solely by the internal oscillator. In contrast, the pin-compatible but functionally enhanced LTC693CS8#TRPBF provides an adjustable reset timeout via external capacitor on the OSC IN pin. Therefore, if variable reset duration is required, the LTC692CS8#TRPBF must be replaced with the LTC693 variant - the LTC692CS8#TRPBF itself has no provision for timeout adjustment.
Can the LTC692CS8#TRPBF drive CMOS RAM chip-enable signals directly?
Yes, the LTC692CS8#TRPBF includes dedicated CE IN and CE OUT pins for direct RAM write-protection. CE OUT is a buffered, gated replica of CE IN when VCC is above the reset threshold; when VCC falls below 4.40V or VBATT, CE OUT is forced high to disable writes. Propagation delay is 35ns maximum, enabling fast, glitch-free write-locking. The CE OUT output can sink/source up to 35mA, allowing direct interface with standard CMOS RAM or EEPROM chip-enable inputs without external buffers - a core feature distinguishing LTC692CS8#TRPBF from basic reset-only supervisors.
What is the maximum continuous output current from the VOUT pin of the LTC692CS8#TRPBF?
The VOUT pin of the LTC692CS8#TRPBF delivers up to 50mA continuously when powered from VCC, with a typical dropout voltage of VCC – 0.05V at 1mA and VCC – 0.50V at 50mA. It uses a charge-pumped NMOS switch with 5Ω typical on-resistance. In battery backup mode (VCC < VBATT), VOUT draws from VBATT via a 125Ω PMOS switch, limiting current to ~250μA - sufficient for low-power CMOS RAM retention but not for active logic. Thermal shutdown activates at ~155°C if overloaded, protecting the LTC692CS8#TRPBF during sustained overcurrent.
How does the power-fail warning function work on the LTC692CS8#TRPBF?
The LTC692CS8#TRPBF implements power-fail warning using a dedicated comparator (C3) that compares the voltage at the PFI pin against an internal 1.3V reference. When PFI falls below 1.3V, the open-drain PFO output pulls low, signaling impending supply collapse. PFI is typically driven by a resistor divider from the monitored rail (e.g., unregulated input or regulated 5V). Unlike the reset comparator, C3 has no built-in hysteresis, but external hysteresis can be added via feedback from PFO to PFI. This allows designers to set PFO assertion several milliseconds before RESET triggers, giving the microprocessor time to execute controlled shutdown - a key capability enabled by the LTC692CS8#TRPBF's dual-threshold architecture.
LTC692CS8#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC692CS8#TRPBF FAQ
1.How can I place an order for LTC692CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC692CS8#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 LTC692CS8#TRPBF reliable?
The price and inventory of LTC692CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC692CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC692CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC692CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC692CS8#TRPBF?
LTC692CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC692CS8#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 LTC692CS8#TRPBF?
For technical support, including LTC692CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC692CS8#TRPBF requirements.
6.How does Aetrix verify that LTC692CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC692CS8#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 LTC692CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC692CS8#TRPBF?
All LTC692CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC692CS8#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 LTC692CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC692CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC692CS8#TRPBF 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…
