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Analog Devices Inc. LTC1232CS8#PBF
- Part No.:
- LTC1232CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1232CS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:161
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Product details
Overview
LTC1232CS8#PBF 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, 2.0mA max supply current, and operates in an 8-pin SO package. It is used in embedded controllers requiring reliable power-up sequencing and fault recovery.
For engineers reviewing the LTC1232CS8#PBF datasheet, LTC1232CS8#PBF pinout, LTC1232CS8#PBF application, or LTC1232CS8#PBF equivalent, key selection criteria include guaranteed reset assertion at 1V VCC, selectable watchdog timeout (150ms/600ms/1.2s via TD pin), debounced push-button reset with ≥250ms active pulse, dual VCC threshold selection (5% or 10% hysteresis), and open-drain RST output capability.
Technical Context
The LTC1232CS8#PBF integrates three independent reset sources: precision bandgap-based VCC monitoring with 40mV hysteresis, a programmable watchdog timer with three timeout options selected by the TD pin (GND/floating/VCC), and a debounced PB RST input that triggers ≥250ms reset pulses after ≥40ms low assertion. All reset paths drive both RST (active-high) and RST (active-low) outputs simultaneously.
Its internal comparator ensures monotonic trip-point behavior across temperature (±0.01V drift over –40°C to 85°C), while the RST open-drain output supports flexible pull-up configurations and maintains logic-low state down to VCC = 1V - critical for controlled microprocessor shutdown during brownout conditions.
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 detection |
| Reset Active Time | 250–1000ms minimum; ensures stable µP initialization after power-up, brownout, or push-button event |
| Watchdog Timeout | 600ms (TD floating); provides fail-safe recovery if µP fails to strobe ST within defined interval |
| Supply Current | 0.5–2.0mA; ultra-low quiescent draw suitable for battery-backed or energy-sensitive systems |
| RST Output Type | Open-drain; allows wired-OR configuration and external pull-up voltage selection up to 7V |
| Operating Temp | –40°C to +85°C (I-grade); qualified for industrial and automotive under-hood environments |
| VCC Min for RST | 1V; guarantees active-low RST remains asserted during deep brownout, preventing µP runaway |
Pinout & Package
Package: 8-lead plastic SO (Small Outline, narrow 0.150″ body), RoHS-compliant, JEDEC MS-012AC compliant, θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | 5V nominal input; must be bypassed with 0.1µF capacitor; supports operation down to 1V for reset holdover |
| GND | Ground reference | Common return for all analog and digital functions; requires low-impedance connection |
| ST | Watchdog strobe input | Edge-triggered reset of watchdog timer; high-to-low transition required ≤600ms (TD floating) to prevent timeout |
| TD | Time-out delay select | Three-state input: GND = 150ms, floating = 600ms, VCC = 1.2s; sets watchdog timeout period |
| TOL | Threshold selection | Selects VCC trip point: GND = 4.62V (5%), VCC = 4.37V (10%) - defines reset activation voltage |
| PB RST | Push-button reset input | Internally pulled up; debounces ≥40ms low pulse and generates ≥250ms reset pulse on release |
| RST | Active-high reset output | Inverted logic output; complements RST; open-drain structure requires external pull-up |
| RST | Active-low reset output | Primary µP reset signal; guaranteed low down to VCC = 1V; open-drain, 6mA sink capability |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset at VCC = 1V | Ensures microprocessor remains held in reset during severe brownout, eliminating erratic execution or latch-up |
| Dual precision VCC thresholds | 4.62V/4.37V trip points with 40mV hysteresis prevent noise-induced false resets on noisy 5V rails |
| Configurable watchdog timeout | Three selectable periods (150ms/600ms/1.2s) via single TD pin enable system-specific fault-recovery timing |
| Hardware-debounced push-button input | Eliminates need for external RC debounce or firmware polling; guarantees clean ≥250ms reset pulse |
| Simultaneous RST/RST outputs | Supports both active-high and active-low reset architectures without level-shifting components |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power cycling and EMI-rich environments cause transient VCC dips and µP lockups. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC monitoring, watchdog supervision, and hardware reset initiation. Use Value: Prevents spurious reboots via 40mV hysteresis and guarantees reset hold until VCC ≥ 4.62V; 600ms timeout recovers hung firmware without manual intervention. | Use Scenario: Battery voltage sag during cold cranking drops 5V rail below spec, risking ECU instability. IC Role / Device Role / Timing Role: Brownout detector and fail-safe reset generator with 1V VCC holdover capability. Use Value: Maintains RST active-low down to VCC = 1V, ensuring ECU stays in safe shutdown state until battery recovers - critical for ASIL-B compliance. |
| Medical Diagnostic Equipment | Network Edge Routers |
Use Scenario: Regulatory requirements mandate deterministic power-on reset and fault logging after power interruption. IC Role / Device Role / Timing Role: Primary reset supervisor with traceable timing (250ms min active time) and push-button initiated diagnostics mode. Use Value: PB RST input delivers certified ≥250ms reset pulse upon button press, enabling repeatable field service entry without software dependency. | Use Scenario: High-availability systems require autonomous recovery from software hangs without operator involvement. IC Role / Device Role / Timing Role: Watchdog timer with configurable timeout (600ms default) and dual-reset outputs for redundant control paths. Use Value: ST strobe monitoring detects µP livelock; automatic 600ms timeout triggers simultaneous RST/RST assertion, forcing full system reboot and state restoration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC699 | No push-button reset input; fixed 4.65V threshold; no TOL pin; same 8-pin SO package | Lacks hardware debounce and user-initiated reset; suited for simpler watchdog-only use cases | Choose LTC699 only when PB RST functionality is unnecessary and fixed 4.65V threshold suffices |
| LTC1326 | Triple supply monitor (5V/3.3V/ADJ); ±0.75% threshold accuracy; 10-lead MSOP package | Supports multi-rail systems but lacks integrated watchdog timer and push-button interface | Select LTC1326 for designs requiring concurrent monitoring of 5V, 3.3V, and adjustable rails - not for standalone 5V watchdog+reset |
Compared with LTC699 and LTC1326, the LTC1232CS8#PBF uniquely combines VCC supervision, programmable watchdog timeout, and debounced push-button reset in a single 8-pin SO package - making it optimal for cost- and space-constrained 5V µP systems needing full reset autonomy.
Availability
LTC1232CS8#PBF is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.
Supply support for LTC1232CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC1232CS8#PBF belongs to Linear's legacy µP supervisory product line, designed specifically for robust, low-component-count power monitoring and fault recovery in 5V microprocessor systems.
FAQ
What is the guaranteed minimum VCC level at which LTC1232CS8#PBF asserts RST?
The LTC1232CS8#PBF guarantees RST remains logic low down to VCC = 1V. This ensures the microprocessor stays in a known reset state during deep brownout conditions, preventing undefined behavior or memory corruption. The specification is tested and guaranteed across temperature and process variation - not a typical value - and applies to both RST and RST outputs.
How does the TD pin configure the watchdog timeout period on LTC1232CS8#PBF?
The TD pin on LTC1232CS8#PBF selects one of three watchdog timeout periods: connecting TD to GND sets 150ms, leaving TD floating sets 600ms (the default for most applications), and connecting TD to VCC sets 1.2s. These settings are internally decoded and do not require external resistors or capacitors - enabling simple, reliable timeout configuration with zero additional components.
Does LTC1232CS8#PBF support both active-high and active-low reset signaling?
Yes, LTC1232CS8#PBF provides simultaneous RST (active-high) and RST (active-low) outputs. Both are open-drain and require external pull-ups. This dual-output architecture eliminates the need for inverters or level shifters, allowing direct interface with µPs that accept either reset polarity - a key advantage in mixed-vendor or legacy design integration.
What is the function of the TOL pin on LTC1232CS8#PBF, and how does it affect reset threshold?
The TOL pin on LTC1232CS8#PBF selects between two precision VCC trip points: when TOL = GND, the reset activates at 4.62V (5% tolerance on 5V); when TOL = VCC, it activates at 4.37V (10% tolerance). This allows system designers to match the reset threshold to their power supply regulation spec - tighter tolerance for high-reliability rails, looser for cost-optimized supplies - without changing BOM.
Can LTC1232CS8#PBF replace DS1232 in existing designs?
Yes, LTC1232CS8#PBF is specified as a superior upgrade for DS1232 and shares identical pinout, package (8-pin SO), and core functionality - including VCC monitoring, watchdog timer, and push-button reset. Key improvements include guaranteed 1V reset holdover, tighter trip-point accuracy (±0.12V vs DS1232's ±0.25V), and lower supply current (2mA max vs 5mA), enabling drop-in replacement with enhanced reliability.
LTC1232CS8#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:
- 4.37V, 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#PBF FAQ
1.How can I place an order for LTC1232CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1232CS8#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 LTC1232CS8#PBF reliable?
The price and inventory of LTC1232CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1232CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1232CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1232CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1232CS8#PBF?
LTC1232CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1232CS8#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 LTC1232CS8#PBF?
For technical support, including LTC1232CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1232CS8#PBF requirements.
6.How does Aetrix verify that LTC1232CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1232CS8#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 LTC1232CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1232CS8#PBF?
All LTC1232CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1232CS8#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 LTC1232CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1232CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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