My Inquiry
My Account
Analog Devices Inc. LTC1232IS8#PBF
- Part No.:
- LTC1232IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1232IS8#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC1232IS8#PBF from Analog Devices (acquired Linear Technology) is a precision microprocessor supervisory circuit providing VCC monitoring, watchdog timer, and push-button reset in an 8-lead SO package. It guarantees RST assertion down to VCC = 1V, features dual precision voltage thresholds (4.62V/4.37V), 600ms power-ok delay, 2.0mA max supply current, and operates from –40°C to +85°C for industrial embedded control systems.
For engineers reviewing the LTC1232IS8#PBF datasheet, LTC1232IS8#PBF pinout, LTC1232IS8#PBF application, or LTC1232IS8#PBF equivalent, key selection criteria include guaranteed reset at 1V VCC, selectable watchdog timeout (150ms/600ms/1.2s via TD pin), TOL-selectable trip points, open-drain RST output with 2mA sink capability, and industrial temperature grade.
Technical Context
The LTC1232IS8#PBF integrates a bandgap-based precision voltage reference, comparator with 40mV hysteresis, debounced push-button input (PB RST), three-level watchdog time-out selection (TD pin), and dual active-low reset outputs (RST and RST). Its internal logic ensures reset remains asserted during brownout and guarantees RST low down to VCC = 1V - critical for controlled µP shutdown.
Watchdog timing is fully configurable: 150ms (TD = GND), 600ms (TD = floating), or 1.2s (TD = VCC); reset pulse width is ≥250ms across all trigger sources (power failure, watchdog timeout, or PB RST release). The TOL pin selects between 4.62V (5% tolerance) and 4.37V (10% tolerance) VCC trip points, enabling flexible supply margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Trip Point | 4.62V (TOL = GND) or 4.37V (TOL = VCC); sets precise power-fail detection threshold for 5V systems |
| Reset Assertion Voltage | Guaranteed RST low down to VCC = 1V; ensures reliable µP hold-in-reset during deep brownout |
| Watchdog Timeout | Selectable 150ms / 600ms / 1.2s via TD pin; enables system-specific watchdog responsiveness |
| Reset Pulse Width | ≥250ms minimum active duration; meets µP reset stabilization requirements per JEDEC JESD22-A102 |
| Supply Current | 2.0mA maximum at VCC = 5V; supports low-power industrial operation without external regulation overhead |
| Operating Temp | –40°C to +85°C (I-grade); qualified for automotive body electronics and industrial controllers |
| RST Output Type | Open-drain, 2mA sink at 0.4V; compatible with 3.3V/5V µP reset inputs and external pull-up flexibility |
Pinout & Package
Package: 8-lead plastic SO (S8), narrow 0.150-inch body, RoHS-compliant, JEDEC MS-012AC compliant. Thermal resistance θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PB RST | Debounced push-button input | Active-low input requiring ≥40ms low pulse; internally pulled up to VCC (10kΩ typical); triggers ≥250ms reset on release |
| TD | Watchdog timeout select | Three-state input: GND → 150ms, floating → 600ms, VCC → 1.2s; configures watchdog sensitivity without external components |
| TOL | Voltage threshold select | GND → 4.62V trip (5% margin), VCC → 4.37V trip (10% margin); enables single-part support for varying supply tolerances |
| GND | Ground reference | Analog/digital common return; must be low-impedance connection to minimize noise-induced false resets |
| VCC | Power supply input | 5V nominal supply (4.5–5.5V range); requires 0.1µF ceramic bypass capacitor placed adjacent to pin |
| ST | Watchdog strobe input | Edge-triggered (high-to-low); resets watchdog timer; must be toggled within selected timeout period to prevent reset |
| RST | Active-low open-drain reset | Drives µP RESET pin low; requires external pull-up; sinks ≥2mA at 0.4V; asserts until VCC > trip point + hysteresis |
| RST | Active-high complementary reset | Inverted logic of RST; provides direct interface to systems requiring active-high reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1V VCC reset hold | Ensures µP remains in defined reset state even during severe undervoltage events - eliminates uncontrolled restarts |
| Dual precision VCC thresholds | 4.62V (5%) and 4.37V (10%) options via TOL pin - supports both tight-regulation and wide-tolerance 5V rails with one footprint |
| Configurable watchdog timeout | Three discrete timeouts (150ms/600ms/1.2s) set by TD pin voltage - avoids external RC timing components and layout variability |
| Integrated push-button debounce | Hardware-based 40ms minimum debounce and ≥250ms fixed reset pulse - eliminates firmware or external RC debounce circuits |
| 40mV internal hysteresis | Prevents oscillatory reset triggering during slow VCC slewing or noise transients - improves system robustness without external components |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Power sequencing and fault recovery in programmable logic controllers operating in harsh factory environments with fluctuating 5V supplies. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, watchdog supervision of main MCU, and hardware reset initiation on power-up/down and user-initiated reset. Use Value: Guarantees clean reset at 1V VCC and delivers 600ms power-ok delay - ensuring FPGA configuration and I/O initialization complete before MCU release. |
Use Scenario: Monitoring 5V supply in door module ECUs exposed to battery voltage transients (load dump, cold crank). IC Role / Device Role / Timing Role: Precision voltage supervisor with selectable 4.37V trip point (TOL = VCC) to tolerate 10% rail variation while maintaining watchdog supervision of safety-critical MCU. Use Value: 40mV hysteresis prevents chatter during slow VCC recovery; open-drain RST allows shared reset bus with other modules. |
| Medical Diagnostic Equipment | Network Edge Routers |
Use Scenario: Ensuring deterministic boot sequence in portable ultrasound units where 5V DC-DC output may sag under high-current transducer activation. IC Role / Device Role / Timing Role: Dual-threshold supervisor triggering reset at 4.62V (TOL = GND) during startup, then holding reset until stable; watchdog guards against firmware lockup during image processing. Use Value: ≥250ms reset pulse satisfies ARM Cortex-M reset timing requirements; RST remains asserted below 1V - preventing partial register initialization. |
Use Scenario: Managing power-on reset and runtime supervision of dual-core network processors in enterprise switches with strict uptime requirements. IC Role / Device Role / Timing Role: Primary reset controller asserting RST on VCC drop, PB RST for field service reset, and ST-driven watchdog to detect packet-processing stalls. Use Value: TD = floating configures 600ms watchdog timeout - long enough to avoid false triggers during firmware updates, short enough to recover from deadlocks. |
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 trip point, 600ms watchdog, but no TOL-selectable threshold or PB RST debounce; only RST output (no RST) | Lacks push-button interface and dual-threshold flexibility; suited for simpler reset-only designs without user reset needs | Choose LTC699 when only basic 5V supervision and watchdog are required, and board space is constrained (same S8 package) |
| LTC1326 | Triple supply monitor (5V/3.3V/ADJ), ±0.75% accuracy, micropower (12µA), but no integrated watchdog or PB RST | Designed for multi-rail systems (e.g., mixed-signal SoC boards); lacks timing supervision - requires external watchdog IC | Choose LTC1326 when monitoring multiple voltages is essential and ultra-low quiescent current is prioritized over integrated timing functions |
Compared with LTC699 and LTC1326, the LTC1232IS8#PBF uniquely combines dual-threshold VCC monitoring, hardware-debounced push-button reset, and three-mode configurable watchdog - all in a single 8-pin SO package - making it optimal for cost-sensitive, space-constrained industrial controllers requiring full reset autonomy.
Availability
LTC1232IS8#PBF is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical diagnostic equipment, and network edge routers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC1232IS8#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. (ADI) acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous industrial and automotive qualification standards.
The LTC1232IS8#PBF belongs to Linear's legacy µP supervisory IC family, designed specifically for robust, component-minimized reset and watchdog functionality in 5V microprocessor systems operating under variable supply and thermal conditions.
FAQ
What is the guaranteed minimum VCC level at which LTC1232IS8#PBF asserts RST?
The LTC1232IS8#PBF guarantees RST remains logic low down to VCC = 1V, ensuring the microprocessor stays in a known reset state during severe brownout conditions. This specification is tested and guaranteed across the full –40°C to +85°C operating temperature range, and is independent of trip point selection (TOL pin state). The LTC1232IS8#PBF achieves this using an internal low-voltage bias circuit that sustains comparator and output stage operation far below standard logic thresholds.
How does the TD pin configure watchdog timeout on LTC1232IS8#PBF?
The TD pin on LTC1232IS8#PBF selects one of three watchdog timeout periods: connect TD to GND for 150ms, leave TD floating for 600ms, or connect TD to VCC for 1.2s. These values are typical and specified over temperature; the 600ms mode (TD floating) is most commonly used for general-purpose µP supervision. The LTC1232IS8#PBF internally biases the TD node, so no external pull-up/down resistors are needed - simplifying layout and reducing BOM count.
Can LTC1232IS8#PBF monitor both 5V and 3.3V rails?
No, the LTC1232IS8#PBF is designed exclusively for 5V supply monitoring with trip points centered at 4.62V and 4.37V. It does not support 3.3V rail supervision - attempting to use it on a 3.3V rail would result in continuous reset assertion since VCC would remain below the minimum trip threshold. For dual-rail monitoring, consider the LTC1326 family, which includes dedicated 3.3V and adjustable thresholds alongside the 5V channel. The LTC1232IS8#PBF must be powered from and monitor only a 5V domain.
What is the function of the TOL pin on LTC1232IS8#PBF?
The TOL pin on LTC1232IS8#PBF selects between two precision VCC trip points: connecting TOL to GND sets the trip point to 4.62V (5% tolerance relative to 5V), while connecting TOL to VCC sets it to 4.37V (10% tolerance). This allows a single LTC1232IS8#PBF footprint to accommodate different power supply regulation specifications without redesign. The LTC1232IS8#PBF uses an internal resistor divider and comparator to implement this dual-threshold architecture, eliminating the need for external trimming components.
Does LTC1232IS8#PBF require external components for basic operation?
The LTC1232IS8#PBF requires only a 0.1µF ceramic bypass capacitor on the VCC pin for stable operation - no external resistors, capacitors, or diodes are needed for core functions (VCC monitoring, watchdog, push-button reset). The PB RST pin includes internal pull-up (~10kΩ), TD and TOL pins are internally biased, and both RST outputs are fully functional with only an external pull-up on RST. This minimal external component count reduces PCB area, assembly cost, and potential failure points - a key design advantage of the LTC1232IS8#PBF.
LTC1232IS8#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1232IS8#PBF FAQ
1.How can I place an order for LTC1232IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1232IS8#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 LTC1232IS8#PBF reliable?
The price and inventory of LTC1232IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1232IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1232IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1232IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1232IS8#PBF?
LTC1232IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1232IS8#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 LTC1232IS8#PBF?
For technical support, including LTC1232IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1232IS8#PBF requirements.
6.How does Aetrix verify that LTC1232IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1232IS8#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 LTC1232IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1232IS8#PBF?
All LTC1232IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1232IS8#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 LTC1232IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1232IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC1232IS8#PBF 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…
