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Analog Devices Inc./Maxim Integrated MAX6448UK23L+T
- Part No.:
- MAX6448UK23L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6448UK23L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,370
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Product details
Overview
MAX6448UK23L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor supervisor IC with one extended-setup manual reset input (MR1) and one immediate-assertion manual reset input (MR2), 2.313V VCC reset threshold, 6.72s MR1 setup period, 140ms min reset timeout, and open-drain active-low RESET output in 5-pin SOT23 package. It ensures reliable system initialization in consumer electronics requiring immunity to switch bounce and transient-induced false resets.
For engineers reviewing the MAX6448UK23L+T datasheet, MAX6448UK23L+T pinout, MAX6448UK23L+T application, or MAX6448UK23L+T equivalent, key selection criteria include its dual-mode manual reset architecture (extended + immediate), guaranteed reset validity down to VCC = 1.0V, 6µA supply current, -40°C to +85°C operation, and compatibility with 3.3V/5V logic systems via open-drain RESET with external pullup.
Technical Context
The MAX6448UK23L+T implements a precision voltage monitor for VCC only (no RSTIN), with factory-trimmed 2.313V reset threshold and 60ppm/°C tempco. Its MR1 input requires ≥6.72s low assertion before generating a 140ms–280ms one-shot RESET pulse, while MR2 triggers immediate RESET on rising edge with 210ms debounce on deassertion.
RESET output is open-drain, specified to sink 3.2mA at VCC ≥ 4.25V with VOL ≤ 0.4V, and features guaranteed valid logic state for VCC ≥ 1.0V. Internal 50kΩ pullups on MR1 and MR2 eliminate need for external resistors, and the device draws only 6µA typical ICC at 3.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±0.075V - precisely monitors 2.5V or 3.3V rail brownout without external components |
| MR1 Setup Period | 6.72s typ - prevents nuisance resets from front-panel button presses shorter than this duration |
| Reset Timeout Period | 140ms min / 210ms typ - ensures µP reset pulse meets minimum assertion time for reliable boot |
| Supply Current | 6µA typ at 3.6V - enables always-on supervision in battery-powered devices with negligible drain |
| Operating Temperature | -40°C to +85°C - supports industrial and extended commercial environments without derating |
| RESET Output Type | Open-drain - allows level-shifting to different logic supplies (e.g., 1.8V µP reset input with 3.3V pullup) |
| VCC Validity Range | 1.0V to 5.5V - guarantees correct RESET logic state even during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, surface-mount, RoHS-compliant lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for all internal circuitry; must be low-impedance connection to system ground plane |
| 2 VCC | Power supply input | Primary monitored supply rail; powers internal comparators and logic; valid from 1.0V to 5.5V |
| 3 MR1 | Extended manual reset input | Active-low input with internal 50kΩ pullup; requires ≥6.72s low assertion to trigger one-shot RESET |
| 4 MR2 | Immediate manual reset input | Active-high input with internal 50kΩ pullup; rising edge triggers immediate RESET pulse; debounced 210ms on release |
| 5 RESET | Open-drain reset output | Active-low signal; requires external pullup resistor (≥20kΩ) to VCC or another logic supply |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode manual reset | MR1 (6.72s extended setup) + MR2 (immediate rising-edge trigger) enables both secure system reset and fast diagnostic reset |
| Immunity to short transients | Rejects VCC glitches ≤20µs when falling 100mV below threshold - eliminates false resets from EMI or switching noise |
| Guaranteed reset at low VCC | Valid RESET logic state maintained down to VCC = 1.0V - ensures deterministic behavior during power collapse |
| Low-power supervision | 6µA typical ICC at 3.6V - extends battery life in portable equipment without compromising supervision integrity |
| No external components required | Factory-set 2.313V threshold and internal MR pullups eliminate trimming resistors and pullup networks |
Applications
| Set-Top Box Power Management | DVD Player System Recovery |
|---|---|
|
Use Scenario: Front-panel power button press initiates soft interrupt if brief, hard reset if held >6.72s; card insertion detected via MR2 rising edge. IC Role / Device Role / Timing Role: Supervisor IC providing dual-path reset control - MR1 for user-initiated full reboot, MR2 for automatic peripheral event response. Use Value: Eliminates need for separate interrupt controller and reset generator; reduces BOM count by integrating debounce, timing, and voltage monitoring. |
Use Scenario: Power-up sequence ensures DVD controller initializes only after 3.3V rail stabilizes above 2.313V; MR2 detects tray-open event for immediate firmware reinitialization. IC Role / Device Role / Timing Role: Voltage monitor and event-triggered reset generator - VCC supervision enforces safe boot window, MR2 provides sub-100ns response to mechanical events. Use Value: Prevents corrupted disc reads during unstable power; enables responsive UI feedback without µP polling overhead. |
| Cable Modem Firmware Recovery | Industrial HMI Panel Reset |
|
Use Scenario: Remote firmware update failure triggers watchdog timeout, asserting MR1 for 6.72s to force clean restart; MR2 used for local service mode entry. IC Role / Device Role / Timing Role: Fault-recovery supervisor - MR1 provides tamper-resistant recovery path, MR2 enables technician access without altering main reset logic. Use Value: Enables field-upgradable systems with zero-touch recovery; separates user and service reset functions in same compact package. |
Use Scenario: Operator presses emergency stop, pulling MR1 low for >6.72s to halt PLC I/O and reset HMI display; MR2 tied to door interlock switch for immediate safety shutdown. IC Role / Device Role / Timing Role: Safety-critical reset coordinator - MR1 enforces deliberate operator action, MR2 delivers <1µs response to hardware safety signals. Use Value: Meets IEC 61508 SIL-2 requirements for dual independent reset paths; eliminates external RC timers and Schmitt triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6447UK23L+T | Same 5-pin SOT23 package, identical 2.313V threshold and 6.72s MR1 setup, but push-pull RESET output instead of open-drain | Requires VCC-referenced RESET load; unsuitable for level-shifting to lower-voltage µP inputs | Select MAX6447UK23L+T only when driving 3.3V/5V µP reset pins directly without voltage translation |
| TPS3808G18DBVR | 2.5V threshold, 200ms reset timeout, 3-pin SOT23, no manual reset inputs - single-function voltage monitor only | Lacks MR1/MR2 dual-mode reset capability; cannot replace front-panel or smart-card event triggering | Choose TPS3808G18DBVR only for basic power-on reset where manual intervention is handled externally |
Compared with MAX6447UK23L+T, MAX6448UK23L+T offers open-drain flexibility for mixed-voltage systems; compared with TPS3808G18DBVR, it adds critical dual-mode reset control essential for user-interactive and safety-critical embedded designs.
Availability
MAX6448UK23L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, cable modems, industrial HMIs, and medical displays requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6448UK23L+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 management, sensing, and interface applications, with emphasis on high reliability and low power.
The MAX6443–MAX6452 family was developed specifically for robust microprocessor supervision in consumer and industrial systems where immunity to mechanical switch bounce, voltage transients, and brownout conditions is mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6448UK23L+T?
The MAX6448UK23L+T has a factory-trimmed VCC reset threshold of 2.313V, with ±0.075V tolerance over temperature. This value is encoded in the "23" suffix per Table 1 of the datasheet and is guaranteed across the full -40°C to +85°C operating range without external calibration.
How does the MR2 input function on the MAX6448UK23L+T?
On the MAX6448UK23L+T, MR2 is an active-high immediate-reset input: a rising edge triggers a 140ms–280ms one-shot RESET pulse, and the input is internally debounced for 210ms on release to prevent false assertions during contact bounce. It is not a latched input and requires clean edge transitions.
Can the MAX6448UK23L+T monitor a voltage other than VCC?
No. The MAX6448UK23L+T monitors only the VCC supply rail. It does not include the RSTIN pin found on MAX6449–MAX6452 variants; therefore, it cannot supervise auxiliary voltages like 1.2V core or 1.8V I/O rails using an external resistor divider.
What is the minimum VCC required for valid RESET output operation of the MAX6448UK23L+T?
The MAX6448UK23L+T guarantees correct RESET logic state (high-impedance when deasserted, low when asserted) for VCC ≥ 1.0V. Below 1.0V, RESET behavior is not specified, and external pulldown resistors are ineffective since this device uses open-drain output.
Is the MAX6448UK23L+T pin-compatible with other devices in the MAX6443–MAX6452 family?
The MAX6448UK23L+T uses the 5-pin SOT23 package (U5+1) and shares identical pinout with MAX6445–MAX6448 variants. However, it is not pin-compatible with 4-pin SOT143 (MAX6443/MAX6444) or 6-pin SOT23 (MAX6449–MAX6452) versions due to differing pin counts and RSTIN presence.
MAX6448UK23L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- 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-23-5
MAX6448UK23L+T FAQ
1.How can I place an order for MAX6448UK23L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6448UK23L+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 MAX6448UK23L+T reliable?
The price and inventory of MAX6448UK23L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6448UK23L+T is usually 5 days.
3.What payment methods are accepted for MAX6448UK23L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6448UK23L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6448UK23L+T?
MAX6448UK23L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6448UK23L+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 MAX6448UK23L+T?
For technical support, including MAX6448UK23L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6448UK23L+T requirements.
6.How does Aetrix verify that MAX6448UK23L+T is sourced from the original manufacturer or authorized distributors?
All MAX6448UK23L+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 MAX6448UK23L+T meets industry standards.
7.What is the process for return or replacement of MAX6448UK23L+T?
All MAX6448UK23L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6448UK23L+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 MAX6448UK23L+T part is unused and in its original packaging.
Return procedure for MAX6448UK23L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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