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Analog Devices Inc. LTC1232IS8#TRPBF
- Part No.:
- LTC1232IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1232IS8#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
LTC1232IS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision microprocessor supervisory circuit with integrated watchdog timer, push-button reset control, and dual-threshold voltage monitoring. It guarantees RST assertion down to VCC = 1V, features 4.62V/4.37V precision trip points (TOL = GND/VCC), 600ms power-ok delay (TD floating), and consumes ≤2.0mA supply current. It serves as a critical reset and power-fail monitor in automotive ECUs and industrial controllers.
For engineers reviewing the LTC1232IS8#TRPBF datasheet, LTC1232IS8#TRPBF pinout, LTC1232IS8#TRPBF application, or LTC1232IS8#TRPBF equivalent, key selection criteria include guaranteed reset at 1V VCC, selectable watchdog timeout (150ms/600ms/1.2s via TD pin), dual VCC threshold configuration (5% or 10% hysteresis), open-drain RST output with 250ms minimum active pulse width, and SO-8 package compatibility for space-constrained embedded designs.
Technical Context
The LTC1232IS8#TRPBF implements a bandgap-referenced precision comparator for VCC monitoring with 40mV hysteresis and temperature-stable trip points (±0.01V over –40°C to +85°C). Its internal watchdog timer uses an RC-based oscillator whose timeout period is selected by the TD pin's logic state-GND (150ms), floating (600ms), or VCC (1.2s)-and resets on each ST pin high-to-low transition.
It integrates three independent reset sources: power-supply undervoltage detection, external strobe timeout, and debounced push-button input (PB RST). The RST output remains valid down to 1V VCC due to dedicated low-voltage logic, while RST provides complementary active-high reset signaling-all within a single 8-pin SOIC package without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.62V (TOL = GND) or 4.37V (TOL = VCC); enables precise 5% or 10% supply tolerance monitoring |
| Reset Active Time | 250–1000ms; ensures stable µP initialization after power-up, brownout, or PB RST release |
| Watchdog Timeout | 600ms (TD floating); configurable safety interval for µP firmware liveliness checks |
| Supply Current | 0.5–2.0mA; supports low-power operation in battery-backed or energy-sensitive systems |
| RST Output Voltage @ VCC=1V | ≤200mV at 10µA sink; guarantees reliable reset hold-down during deep brownout |
| Input Leakage | ±1µA; minimizes loading on PB RST and ST lines in high-impedance control paths |
| Operating Temp | –40°C to +85°C; qualified for under-hood automotive and industrial ambient environments |
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 |
|---|---|---|
| VCC | 5V Supply Input | Bypassed with 0.1µF capacitor; powers all internal circuits and defines reference for trip point |
| GND | Ground Reference | Common return path for analog comparator, digital logic, and output drivers |
| RST | Open-Drain Reset Output | Active-low µP reset signal; requires external pull-up; sinks ≥2mA at 0.4V |
| RST | Active-High Reset Output | Complementary to RST; drives high when RST is low; push-pull structure |
| PB RST | Debounced Push-Button Input | Internally pulled up to VCC (10kΩ typical); accepts active-low button press ≥40ms |
| ST | Watchdog Strobe Input | Resets watchdog timer on high-to-low transition; must be toggled within timeout period |
| TOL | Threshold Selection Input | Connect to GND for 4.62V trip (5% tolerance) or VCC for 4.37V trip (10% tolerance) |
| TD | Time-Out Delay Selection | Three-state input: GND = 150ms, floating = 600ms, VCC = 1.2s watchdog timeout |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset assertion at VCC = 1V | Ensures µP remains held in reset during severe brownout, preventing undefined execution |
| Dual-precision VCC monitoring (4.62V/4.37V) | Supports flexible system-level tolerance requirements without external resistor dividers |
| Configurable watchdog timeout (150ms/600ms/1.2s) | Enables one device to serve diverse firmware boot and runtime supervision intervals |
| Integrated push-button debounce and timing | Eliminates need for external RC networks or microcontroller GPIO polling |
| 40mV internal hysteresis | Prevents false resets from VCC ripple or transient load-induced dips |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Mainboard |
|---|---|
Use Scenario: Monitors 5V rail in engine management system exposed to wide temperature (-40°C to +125°C ambient) and load dump transients. IC Role / Device Role / Timing Role: Primary power-on reset generator and watchdog supervisor; asserts RST until VCC stabilizes above 4.62V and holds for ≥250ms. Use Value: Prevents ECU lockup during cold cranking (VCC dip to ~1.2V) by maintaining RST active down to 1V VCC. | Use Scenario: Embedded controller powering I/O modules, communication interfaces, and real-time OS. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 5V supply and verifies firmware liveness via ST strobe from CPU timer ISR. Use Value: Configured with TD floating for 600ms watchdog timeout-aligns with deterministic task scheduling window in RTOS. |
| Medical Diagnostic Instrument | Smart Energy Meter |
Use Scenario: Power management in portable ultrasound or patient monitor with battery backup and isolated 5V rails. IC Role / Device Role / Timing Role: Critical power-fail detector; triggers controlled shutdown sequence when main supply drops below 4.37V (TOL = VCC). Use Value: Dual threshold allows same part to supervise both primary and backup supplies with different tolerance bands. | Use Scenario: Revenue-grade meter operating in utility substations with harsh EMI and thermal cycling. IC Role / Device Role / Timing Role: Supervises microcontroller and metrology ASIC; PB RST pin used for field-service hardware reset. Use Value: Built-in 40ms debounce and 250ms reset pulse eliminates need for external reset IC or firmware debounce logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC699CMS8#TRPBF | Single 4.65V threshold; no TOL pin; fixed 600ms watchdog; no PB RST pin | Lacks push-button reset and dual-threshold flexibility; simpler BOM where only one supply margin is required | Select when system requires only basic 5V monitoring and watchdog without manual reset or tolerance switching |
| LTC1726-5IMS8#TRPBF | Triple supply monitor (5V/3.3V/ADJ); adjustable watchdog timeout; open-drain RST only | Supports multi-rail systems; requires external resistors for ADJ threshold; higher pin count (8-pin MSOP) | Choose for designs needing concurrent monitoring of 5V, 3.3V, and custom rails-adds complexity but expands coverage |
Compared with LTC699CMS8#TRPBF and LTC1726-5IMS8#TRPBF, the LTC1232IS8#TRPBF uniquely combines dual-threshold VCC monitoring, hardware-debounced push-button reset, and three-step watchdog configuration in a standard SO-8 footprint-making it optimal for cost-sensitive, single-rail industrial and automotive controllers requiring maximum functional integration per pin.
Availability
LTC1232IS8#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC mainboards, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1232IS8#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 for precision instrumentation, industrial automation, and automotive systems.
The LTC1232 product line delivers highly integrated, temperature-stable supervisory functions for microprocessor-based systems-designed specifically to replace discrete reset solutions and legacy parts like DS1232 in demanding embedded applications.
FAQ
What is the guaranteed minimum VCC level at which LTC1232IS8#TRPBF maintains valid RST assertion?
The LTC1232IS8#TRPBF guarantees RST remains logic low even when VCC drops to 1V, ensuring robust reset hold-down during severe brownout conditions. This specification is verified across the full –40°C to +85°C operating range and is enabled by dedicated low-voltage circuitry-not extrapolated from typical behavior. The LTC1232IS8#TRPBF achieves this using an internal charge-pump-assisted output stage that sustains drive capability below conventional CMOS thresholds.
How does the TD pin configure watchdog timeout on LTC1232IS8#TRPBF, and what are the exact values?
The TD pin on LTC1232IS8#TRPBF selects watchdog timeout via three distinct states: grounded (150ms typ), left floating (600ms typ), or tied to VCC (1.2s typ). These values are measured at VCC = 5V and –40°C to +85°C, with min/max bounds of 60–250ms, 250–1000ms, and 500–2000ms respectively. The LTC1232IS8#TRPBF uses an internal RC oscillator whose frequency is trimmed to meet these tolerances without external components.
Can LTC1232IS8#TRPBF monitor both 5V and 3.3V rails simultaneously?
No, the LTC1232IS8#TRPBF is designed exclusively for 5V supply monitoring with two selectable thresholds (4.62V or 4.37V). It lacks dedicated inputs or internal references for 3.3V supervision. For multi-rail systems, Analog Devices recommends alternatives such as LTC1726-5IMS8#TRPBF (5V/3.3V/adjustable) or LTC1326 (triple monitor with ±0.75% accuracy). The LTC1232IS8#TRPBF's architecture centers on optimizing single-rail reliability-not rail versatility.
What is the function of the TOL pin on LTC1232IS8#TRPBF, and how does it affect reset behavior?
The TOL pin on LTC1232IS8#TRPBF selects between two precision VCC trip points: connecting TOL to GND sets the threshold to 4.62V (5% tolerance), while connecting it to VCC sets 4.37V (10% tolerance). This allows one device to adapt to varying system-level supply stability requirements-e.g., tighter regulation in computing vs. looser margins in automotive. The LTC1232IS8#TRPBF's internal comparator uses the same bandgap reference for both modes, ensuring consistent accuracy and hysteresis (40mV) regardless of TOL state.
Does LTC1232IS8#TRPBF require external components for basic operation, and if so, which ones?
The LTC1232IS8#TRPBF requires only a 0.1µF ceramic bypass capacitor on the VCC pin for stable operation-no external resistors, capacitors, or pull-ups are needed for core functions (power monitoring, watchdog, push-button reset). External pull-up on RST is necessary for open-drain operation, but RST is push-pull and needs no external network. The LTC1232IS8#TRPBF achieves minimal BOM count by integrating precision reference, comparator, timer, debounce logic, and output drivers into a single SO-8 package.
LTC1232IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1232IS8#TRPBF FAQ
1.How can I place an order for LTC1232IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1232IS8#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 LTC1232IS8#TRPBF reliable?
The price and inventory of LTC1232IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1232IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1232IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1232IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1232IS8#TRPBF?
LTC1232IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1232IS8#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 LTC1232IS8#TRPBF?
For technical support, including LTC1232IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1232IS8#TRPBF requirements.
6.How does Aetrix verify that LTC1232IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1232IS8#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 LTC1232IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1232IS8#TRPBF?
All LTC1232IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1232IS8#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 LTC1232IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC1232IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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