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Analog Devices Inc./Maxim Integrated MAX6452UT46L+T
- Part No.:
- MAX6452UT46L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6452UT46L+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,800
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Product details
Overview
MAX6452UT46L+T from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (4.625V) and one adjustable-threshold (0.63V reference) voltage monitor, extended manual reset setup period (6.72s), push-pull active-low RESET output, and 6-pin SOT23 package. It ensures reliable system reset during power-up, brownout, and intentional front-panel reset in consumer and industrial electronics.
For engineers reviewing the MAX6452UT46L+T datasheet, MAX6452UT46L+T pinout, MAX6452UT46L+T application, or MAX6452UT46L+T equivalent, key selection considerations include its dual-monitor architecture (VCC + RSTIN), precise 4.625V fixed threshold with ±0.125V tolerance, 6.72s MR1 setup timeout, 140ms min reset pulse width, and guaranteed operation down to VCC = 1.0V.
Technical Context
The MAX6452UT46L+T integrates two independent reset comparators: one monitors VCC against a factory-trimmed 4.625V threshold (±0.125V), while the second monitors an external voltage via RSTIN using a precision 0.630V internal reference (±0.015V over -40°C to +85°C). Its MR1 input requires a 6.72s low assertion before generating a one-shot RESET pulse, and MR2 provides immediate reset on rising edge - enabling interrupt-before-reset and smart-card-detect functionality.
This device uses BiCMOS process technology, delivers 6µA typical supply current at 3.6V, guarantees valid RESET output logic down to VCC = 1.0V, and features internal 50kΩ pullups on both MR1 and MR2. The RESET output is push-pull active-low with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.55V) and VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 3.15V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.625V (factory-trimmed, ±0.125V tolerance) - ensures reset assertion when main supply drops below nominal 4.6V rail |
| RSTIN Reference Voltage | 0.630V (±0.015V over full temp range) - enables accurate monitoring of voltages as low as 0.63V via external resistor divider |
| MR1 Setup Period | 6.72s (L-suffix) - prevents nuisance resets from brief button presses; requires sustained low for >6.7s to trigger reset |
| Reset Timeout Period | 140ms minimum - guarantees sufficient processor reset hold time per JEDEC JESD8-12E |
| Supply Current | 6µA typical at 3.6V - enables battery-backed or ultra-low-power always-on monitoring |
| Operating Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout conditions |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup; drives directly into µP reset pin |
Pinout & Package
MAX6452UT46L+T is housed in a 6-pin SOT23 package (package code U6+1, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad for thermal performance. Pin 1 is MR1 (active-low manual reset with 50kΩ internal pullup), Pin 2 is VCC (supply and primary monitor input), Pin 3 is RESET (push-pull active-low output), Pin 4 is GND, Pin 5 is MR2 (immediate-reset active-high input), and Pin 6 is RSTIN (high-impedance adjustable-threshold input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR1 | Extended manual reset input | Active-low; internal 50kΩ pullup to VCC; must be held low ≥6.72s to initiate one-shot reset pulse |
| 2 - VCC | Main supply input & monitor source | Power supply pin and input to fixed 4.625V reset comparator; operates from 1.0V to 5.5V |
| 3 - RESET | Active-low reset output | Push-pull driver; asserts low for ≥140ms after VCC/RSTIN fault or MR1/MR2 trigger; valid down to VCC = 1.0V |
| 4 - GND | Ground reference | Common return for all internal circuits and external biasing networks |
| 5 - MR2 | Immediate manual reset input | Active-high; rising edge triggers immediate one-shot reset; debounced for 210ms on falling edge to prevent false triggers |
| 6 - RSTIN | Adjustable voltage monitor input | High-impedance (≤25nA leakage) input referenced to 0.630V; used with external resistor divider to set custom reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (4.625V) and secondary rail (via RSTIN + external divider) - enables multi-rail system integrity checks |
| Extended + immediate manual reset inputs | MR1 (6.72s setup) prevents accidental resets; MR2 rising-edge trigger enables instant system test or card-detect response without delay |
| Guaranteed reset validity down to VCC = 1.0V | Ensures deterministic µP reset state even during severe brownout - no undefined logic states at low supply |
| Low 6µA quiescent current | Enables permanent connection to battery-backed rails without significant drain - suitable for always-on monitoring |
| Immunity to short transients | Rejects <20µs VCC glitches dropping 100mV below threshold - avoids spurious resets in noisy environments |
Applications
| Set-Top Box Power Management | DVD Player Brownout Recovery |
|---|---|
Use Scenario: Monitors 3.3V and 1.2V rails in digital media players; detects undervoltage on either rail during AC dropout or capacitor aging. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-low RESET to ARM-based SoC upon first rail failure; holds reset for ≥140ms to ensure full processor initialization. Use Value: Prevents corrupted firmware execution during partial power loss - eliminates boot-loop failures in field-deployed units. | Use Scenario: Integrated into DVD player front-panel control board to coordinate power-on sequence and handle emergency reset during disc jam or laser error. IC Role / Device Role / Timing Role: MR1 tied to "power" button (6.72s press = hard reset); MR2 tied to eject sensor (rising edge = immediate reset on disc removal); RESET drives SoC reset and motor controller enable. Use Value: Enables single-button user interface for both normal operation and recovery - reduces BOM count and improves serviceability. |
| Industrial PLC I/O Module | Automotive Infotainment Head Unit |
Use Scenario: Supervises isolated 5V and 24V auxiliary supplies in programmable logic controller modules operating in harsh factory environments. IC Role / Device Role / Timing Role: VCC monitors 5V logic rail; RSTIN monitors 24V field bus via 39kΩ/1kΩ divider (threshold = 24.63V); RESET asserts on either fault with 140ms hold time. Use Value: Ensures deterministic restart after voltage sags caused by motor switching or EMI - meets IEC 61000-4-11 immunity requirements. | Use Scenario: Used in automotive head unit to supervise 5V MCU supply and 1.8V display interface rail across temperature (-40°C to +85°C) and vibration conditions. IC Role / Device Role / Timing Role: Fixed 4.625V threshold guards 5V rail; RSTIN monitors 1.8V rail via 250kΩ/100kΩ divider (threshold = 1.83V); RESET drives ASIL-B compliant reset chain. Use Value: Provides AEC-Q100-aligned supervision without external components - reduces layout area and qualification effort for automotive grade designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6452UT46T+T | Same dual-monitor architecture and 4.625V VCC threshold, but MR1 setup period reduced to 1.68s (T-suffix vs L-suffix) | Suitable where shorter user-press duration is acceptable (e.g., handheld devices), but less immune to accidental presses than 6.72s version | Select MAX6452UT46T+T only if system UI design mandates sub-2s reset activation; otherwise MAX6452UT46L+T preferred for robustness |
| TPS3808G33DBVR | Single 3.3V fixed threshold, no adjustable RSTIN input, 200ms reset timeout, 3-pin SOT23 package | Lacks dual-monitor capability and MR2 immediate-reset function; limited to single-rail applications requiring only basic 3.3V supervision | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where adjustable monitoring and dual reset inputs are unnecessary |
Compared with MAX6452UT46T+T, the MAX6452UT46L+T offers superior noise immunity via longer MR1 setup time; compared with TPS3808G33DBVR, it delivers expanded functionality including dual-rail monitoring, user-configurable thresholds, and dual-mode reset inputs - justifying its use in complex embedded systems demanding high reliability.
Availability
MAX6452UT46L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, industrial PLC modules, automotive infotainment systems, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6452UT46L+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, connectivity, and security applications in industrial, automotive, and consumer markets.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in noise-prone environments, featuring extended manual reset timing, dual-voltage monitoring, and guaranteed operation down to 1.0V supply - addressing reliability gaps in consumer electronics and industrial controls.
FAQ
What is the exact VCC reset threshold voltage for MAX6452UT46L+T?
The MAX6452UT46L+T has a factory-trimmed VCC reset threshold of 4.625V, with a guaranteed tolerance of ±0.125V (4.50V to 4.75V) over the full -40°C to +85°C operating temperature range. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" for suffix "46", and applies specifically to the MAX6452UT46L+T - not to other variants in the MAX6443–MAX6452 family.
Does MAX6452UT46L+T support monitoring a secondary voltage lower than 1.0V?
Yes, the MAX6452UT46L+T supports monitoring voltages as low as 0.63V via its RSTIN pin, which connects to an internal precision 0.630V reference comparator. By using an external resistor divider (e.g., R1 = 375kΩ, R2 = 250kΩ), users can configure the monitored threshold to 1.50V; for sub-1.0V rails, R2 ≥ 250kΩ maintains leakage current <25nA. This capability is exclusive to MAX6449–MAX6452 variants and is documented in the Adjustable Input Voltage section of the MAX6452UT46L+T datasheet.
What is the function of MR2 on MAX6452UT46L+T, and how does it differ from MR1?
On the MAX6452UT46L+T, MR2 is an active-high immediate-reset input: a rising edge triggers a one-shot RESET pulse with 140ms minimum duration, and is debounced for 210ms on the falling edge to suppress contact bounce. In contrast, MR1 is active-low with a 6.72s extended setup period (L-suffix) - it must be held low continuously for ≥6.72s to assert RESET. This dual-input architecture enables distinct use cases: MR1 for deliberate hard reset, MR2 for fast-response events like smart-card insertion detection.
Is MAX6452UT46L+T compatible with 1.8V logic systems?
Yes, the MAX6452UT46L+T is fully compatible with 1.8V logic systems. Its MR1 and MR2 inputs accept logic levels defined as VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC, so at VCC = 1.8V, they recognize <0.54V as low and >1.26V as high. The RESET output is push-pull with VOH ≥ 0.8×VCC at ISOURCE = 200µA, ensuring clean 1.44V high-level drive into 1.8V µP reset pins. All electrical characteristics are specified down to VCC = 1.0V.
What package type and pin count does MAX6452UT46L+T use?
The MAX6452UT46L+T uses a 6-pin SOT23 package (package code U6+1, outline 21-0058), with standard 0.95mm lead pitch, 2.9mm × 1.6mm body size, and exposed thermal pad. Pinout is: Pin 1 = MR1, Pin 2 = VCC, Pin 3 = RESET, Pin 4 = GND, Pin 5 = MR2, Pin 6 = RSTIN. This matches the functional diagram and pin configuration diagrams on page 10 of the official MAX6443–MAX6452 datasheet.
MAX6452UT46L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.625V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6452UT46L+T FAQ
1.How can I place an order for MAX6452UT46L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6452UT46L+T 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 MAX6452UT46L+T reliable?
The price and inventory of MAX6452UT46L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6452UT46L+T is usually 5 days.
3.What payment methods are accepted for MAX6452UT46L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6452UT46L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6452UT46L+T?
MAX6452UT46L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6452UT46L+T 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 MAX6452UT46L+T?
For technical support, including MAX6452UT46L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6452UT46L+T requirements.
6.How does Aetrix verify that MAX6452UT46L+T is sourced from the original manufacturer or authorized distributors?
All MAX6452UT46L+T 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 MAX6452UT46L+T meets industry standards.
7.What is the process for return or replacement of MAX6452UT46L+T?
All MAX6452UT46L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6452UT46L+T, 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 MAX6452UT46L+T part is unused and in its original packaging.
Return procedure for MAX6452UT46L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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