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Analog Devices Inc. LTC1232CS8#TRPBF
- Part No.:
- LTC1232CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1232CS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,521
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Product details
Overview
LTC1232CS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision microprocessor supervisory circuit with integrated watchdog timer, push-button reset debouncing, and dual-threshold voltage monitoring. It provides guaranteed active-low RST assertion down to VCC = 1V, 4.62V/4.37V precision trip points (selectable via TOL pin), 600ms power-ok delay (TD floating), and 2.0mA max supply current. Used in embedded controllers requiring reliable power-up sequencing and fault recovery.
For engineers reviewing the LTC1232CS8#TRPBF datasheet, LTC1232CS8#TRPBF pinout, LTC1232CS8#TRPBF application, or LTC1232CS8#TRPBF equivalent, key selection criteria include VCC trip point hysteresis (40mV), open-drain RST output drive capability (6mA sink), watchdog time-out configurability (150ms/600ms/1.2s), and SO-8 package compatibility for space-constrained industrial control boards.
Technical Context
The LTC1232CS8#TRPBF integrates a bandgap voltage reference, precision comparator with 40mV hysteresis, and a programmable watchdog timer with three selectable timeout periods (150ms/600ms/1.2s) set by the TD pin state (GND/floating/VCC). Its internal debounce logic ensures ≥40ms PB RST low assertion before generating a ≥250ms reset pulse.
It features dual VCC threshold detection: 4.62V typical (TOL = GND, ±5%) and 4.37V typical (TOL = VCC, ±10%), both guaranteed over 0°C to 70°C. The RST output remains valid down to VCC = 1V, enabling robust brownout hold-off in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.62V (TOL = GND) or 4.37V (TOL = VCC); enables precise 5V supply monitoring with selectable tolerance |
| Reset Active Time | 250–1000ms; guarantees minimum processor stabilization window after power-up or fault |
| Watchdog Timeout | 600ms (TD floating); configurable fallback period for microcontroller activity supervision |
| RST Output Type | Open-drain; allows wired-OR reset bus configuration and external pull-up voltage flexibility |
| Supply Current | 0.5–2.0mA; ultra-low quiescent draw suitable for always-on monitoring in energy-sensitive systems |
| VCC Min for RST Validity | 1.0V; ensures reset signal integrity during deep brownout, preventing spurious MCU wake-up |
| Input Leakage | ±1µA; minimizes parasitic loading on PB RST and ST inputs in high-impedance control paths |
Pinout & Package
Package: 8-lead plastic SO (SO-8, narrow 0.150-inch body), RoHS-compliant, JEDEC MS-012AC compliant, θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PB RST | Debounced push-button input | Active-low logic input; internally pulled up to VCC (10kΩ typ); requires ≥40ms low pulse to trigger ≥250ms RST assertion |
| TD | Watchdog timeout select | Three-state input: GND = 150ms, floating = 600ms, VCC = 1.2s; sets watchdog timer period without external components |
| TOL | Voltage threshold select | Selects trip point hysteresis: GND = 4.62V (±5%), VCC = 4.37V (±10%); enables dual-supply tolerance configuration |
| GND | Ground reference | Analog and digital ground return; must be low-impedance connection to minimize noise coupling into comparator |
| VCC | Power supply input | 5V nominal supply (4.5–5.5V range); requires 0.1µF ceramic bypass capacitor placed near pin |
| ST | Watchdog strobe input | Edge-triggered reset input; high-to-low transition resets watchdog timer; pulse width ≥20ns required |
| RST | Active-low open-drain reset | Drives µP RESET pin low; requires external pull-up; sinks ≥6mA at 0.4V for reliable logic-level assertion |
| RST | Active-high push-pull reset | Inverted complement of RST; drives high when RST is low; eliminates need for external inverter in some designs |
Key Features
| Feature | Design Value |
|---|---|
| Dual-precision VCC monitoring | 4.62V and 4.37V thresholds with 40mV hysteresis ensure immunity to supply transients and stable reset release |
| Configurable watchdog timer | Three factory-set timeout options (150ms/600ms/1.2s) selected solely by TD pin state-no external RC network needed |
| Integrated push-button debounce | Hardware-based timing rejects mechanical switch bounce; guarantees ≥250ms clean reset pulse after ≥40ms button press |
| Brownout-safe reset assertion | RST remains valid down to VCC = 1V, ensuring microprocessor stays held in reset during deep undervoltage conditions |
| Low-power operation | 2.0mA maximum ICC enables continuous monitoring in battery-powered or energy-harvesting applications |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
|
Use Scenario: Power sequencing and runtime watchdog supervision in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, push-button initiated system reset, and periodic ST strobing to confirm firmware liveness. Use Value: Prevents runaway code execution and ensures deterministic restart after power interruption using 600ms watchdog timeout and 4.62V trip point. |
Use Scenario: Ensuring safe boot and fault containment in portable ultrasound or patient monitor units with backup battery support. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RST during main supply drop while maintaining reset validity down to 1V for battery switchover. Use Value: Guarantees controlled shutdown and prevents corrupted memory writes during brownout using 40mV hysteresis and 250ms minimum reset pulse. |
| Automotive Body Control Modules | Point-of-Sale Terminal Systems |
|
Use Scenario: Monitoring 5V rail in BCMs exposed to load-dump and cold-crank conditions across –40°C to 105°C ambient. IC Role / Device Role / Timing Role: Precision voltage monitor with TOL-selectable thresholds adapting to varying system tolerances; RST holds MCU in reset until stable 5V is confirmed. Use Value: Eliminates need for external voltage dividers or comparators-reduces BOM count and improves thermal stability of reset threshold. |
Use Scenario: Reliable power-up initialization and user-initiated reset in retail kiosks subject to frequent AC cycling and accidental button presses. IC Role / Device Role / Timing Role: Hardware reset manager performing debounced PB RST handling, VCC validation, and watchdog supervision of payment processing firmware. Use Value: Delivers certified 250ms minimum reset pulse and rejects false triggers from ESD or contact bounce-meeting IEC 61000-4-2 compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC699 | Same 4.65V threshold and 600ms watchdog, but lacks PB RST input and TOL-selectable hysteresis | Requires external debounce circuitry for push-button reset; less flexible for dual-voltage-tolerance designs | Choose LTC699 only if push-button interface is unnecessary and fixed 4.65V threshold suffices |
| LTC1326 | Triple supply monitor (5V/3.3V/ADJ) with ±0.75% accuracy, but higher ICC (15µA) and no integrated watchdog timer | Supports multi-rail systems but cannot replace watchdog functionality without adding external timing IC | Choose LTC1326 when monitoring multiple supplies is critical and watchdog is implemented separately |
Compared with LTC1232CS8#TRPBF, LTC699 offers identical core supervision but omits push-button integration and threshold flexibility, while LTC1326 extends monitoring to three rails at the cost of losing watchdog capability-making LTC1232CS8#TRPBF optimal for single-rail, self-contained reset management.
Availability
LTC1232CS8#TRPBF is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC1232CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1232CS8#TRPBF belongs to Linear's legacy supervisory IC product line, designed specifically for robust, low-component-count power monitoring and reset generation in microprocessor-based systems.
FAQ
What is the guaranteed minimum VCC level at which LTC1232CS8#TRPBF maintains valid RST output?
The LTC1232CS8#TRPBF guarantees RST output voltage ≤200mV (active low) with VCC as low as 1.0V, measured at ISINK = 10µA. This ensures the microprocessor remains held in reset during severe brownout conditions where other supervisors may release prematurely. The LTC1232CS8#TRPBF achieves this via optimized internal biasing and rail-to-rail comparator design.
How does the TOL pin affect the VCC trip point of LTC1232CS8#TRPBF?
The TOL pin selects between two precision VCC thresholds: connecting TOL to GND sets VCCTP = 4.62V (±5% typical), while connecting TOL to VCC sets VCCTP = 4.37V (±10% typical). This allows one LTC1232CS8#TRPBF design to accommodate different system tolerance requirements without changing the bill of materials. The LTC1232CS8#TRPBF datasheet specifies hysteresis of 40mV in both configurations.
Can LTC1232CS8#TRPBF be used with a 3.3V microprocessor supply?
No-the LTC1232CS8#TRPBF is specified only for 4.5V to 5.5V VCC operation and monitors a 5V rail. Its internal reference and comparator are calibrated for 5V systems. For 3.3V supply monitoring, consider alternatives like LTC694-3.3 (2.9V threshold) or LTC1728-3.3 (SOT-23 triple monitor). The LTC1232CS8#TRPBF will not function correctly below 4.5V VCC.
What is the maximum sink current capability of the RST output on LTC1232CS8#TRPBF?
The RST output of LTC1232CS8#TRPBF is an open-drain driver rated for 2mA minimum and 6mA maximum sink current at VO = 0.4V, per DC Electrical Characteristics table. This allows direct interfacing with most 5V µP RESET inputs without additional buffering. The LTC1232CS8#TRPBF specification assumes standard CMOS load conditions and accounts for worst-case temperature variation.
Does LTC1232CS8#TRPBF require external components for basic watchdog operation?
No-basic watchdog operation requires zero external components. The timeout period (150ms/600ms/1.2s) is selected solely by the TD pin state (GND/floating/VCC). Only the VCC bypass capacitor (0.1µF ceramic) is mandatory for stable operation. The LTC1232CS8#TRPBF integrates all timing, comparison, and reset generation circuitry internally, fulfilling its "minimum external component count" design goal.
LTC1232CS8#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:
- 4.37V, 4.62V
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 250ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1232CS8#TRPBF FAQ
1.How can I place an order for LTC1232CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1232CS8#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 LTC1232CS8#TRPBF reliable?
The price and inventory of LTC1232CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1232CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1232CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1232CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1232CS8#TRPBF?
LTC1232CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1232CS8#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 LTC1232CS8#TRPBF?
For technical support, including LTC1232CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1232CS8#TRPBF requirements.
6.How does Aetrix verify that LTC1232CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1232CS8#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 LTC1232CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1232CS8#TRPBF?
All LTC1232CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1232CS8#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 LTC1232CS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1232CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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