My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6443US23L+T
- Part No.:
- MAX6443US23L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6443US23L+T.pdf
- Description:
- IC MPU RESET 2.313V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,271
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6443US23L+T from Maxim Integrated is a single-supply, fixed-threshold microprocessor reset supervisor IC with one extended-setup manual reset input (MR1), active-low push-pull RESET output, 2.313V VCC reset threshold, and 6.72s manual reset setup period. It monitors VCC only, asserts RESET when VCC drops below 2.313V, holds RESET low for 210ms (typ) after recovery, and consumes just 6µA at 3.6V - used in set-top boxes and DVD players to prevent brownout-induced firmware corruption.
For engineers reviewing the MAX6443US23L+T datasheet, MAX6443US23L+T pinout, MAX6443US23L+T application, or MAX6443US23L+T equivalent, key selection criteria include its guaranteed valid reset down to VCC = 1.0V, immunity to <20µs transients at 100mV overdrive, SOT143-4 package footprint, and precise factory-set 2.313V threshold with ±12.5mV tolerance over -40°C to +85°C.
Technical Context
The MAX6443US23L+T implements a precision bandgap-based voltage monitor for VCC only, with internal hysteresis of 2×VTH (≈4.6mV) and 60ppm/°C tempco. Its MR1 input features a 50kΩ internal pullup and requires a sustained low pulse of exactly 6.72s (L-suffix) to trigger a one-shot 140ms–280ms RESET assertion.
No RSTIN or second manual reset (MR2) functionality is present; it lacks adjustable monitoring capability and dual-reset logic. The push-pull RESET output drives low to ≤0.3V at 50µA sink current and high to ≥0.8×VCC, ensuring direct compatibility with 1.8V–5.5V µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±12.5mV - factory-trimmed precision threshold for reliable brownout detection at nominal 2.3V rails |
| Manual Reset Setup Period (tMR) | 6.72s - extended debounce window prevents nuisance resets from front-panel switch bounce or accidental presses |
| Reset Timeout Period (tRP) | 140ms (min) to 280ms (max) - ensures µP completes full power-up initialization before release |
| Supply Current (ICC) | 6µA (typ) at 3.6V - enables always-on supervision in battery-backed or ultra-low-power consumer devices |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET assertion even during deep brownout conditions down to 1.0V VCC |
| Package & Temp Range | SOT143-4, -40°C to +85°C - compact surface-mount footprint qualified for industrial and consumer ambient environments |
Pinout & Package
MAX6443US23L+T is housed in a 4-pin SOT143 package (outline 21-0052), with pins arranged in standard top-view order: Pin 1 = GND, Pin 2 = VCC, Pin 3 = MR1, Pin 4 = RESET. All pins are rated for -0.3V to +6V absolute max, and the package supports reflow soldering per JEDEC J-STD-020 (lead-free: +260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND | Ground reference | Primary return path for VCC supply and internal comparator bias; must be low-impedance connection to system ground plane |
| 2: VCC | Power supply & monitored rail | Supplies IC core and serves as sole monitored voltage source; operation guaranteed from 1.0V to 5.5V |
| 3: MR1 | Active-low manual reset input | Internally pulled up to VCC via 50kΩ; requires ≥6.72s low assertion to generate one-shot RESET pulse |
| 4: RESET | Active-low push-pull output | Drives µP reset pin directly; sinks ≤0.3V @ 50µA, sources ≥0.8×VCC @ 200µA - no external pullup needed |
Key Features
| Feature | Design Value |
|---|---|
| Precision fixed reset threshold | 2.313V with ±12.5mV tolerance over full temperature range - eliminates need for external resistor dividers or calibration |
| Extended manual reset setup | 6.72s MR1 hold time - rejects all switch closures shorter than this, enabling use of unfiltered mechanical buttons |
| Low quiescent current | 6µA typical at 3.6V - extends battery life in always-on consumer electronics like DVD players and modems |
| Valid reset down to VCC = 1.0V | RESET remains functional and logic-valid even as supply collapses - prevents undefined µP state during deep brownout |
| Transient immunity | Immune to VCC glitches ≤20µs wide when falling 100mV below threshold - avoids false resets from EMI or switching noise |
Applications
| Set-Top Box Power Management | DVD Player Brownout Recovery |
|---|---|
Use Scenario: System experiences unstable AC line sags during channel change or HDMI hot-plug events. IC Role / Device Role / Timing Role: Monitors 3.3V VCC rail and asserts RESET if voltage dips below 2.313V for >100ms, holding reset for 210ms after recovery to ensure clean µP restart. Use Value: Prevents corrupted video buffer writes and HDMI handshake failures by enforcing deterministic reset timing during marginal supply conditions. |
Use Scenario: Battery-backed real-time clock circuit sustains 1.8V rail while main 5V rail collapses during disc ejection. IC Role / Device Role / Timing Role: Supervises primary 3.3V supply only; ignores secondary rails, asserting RESET solely on VCC breach to halt firmware execution before data loss. Use Value: Enables safe shutdown sequence initiation without requiring multi-rail monitoring complexity or additional ICs. |
| Cable Modem Front-Panel Reset | Industrial Media Player Watchdog |
Use Scenario: User holds front-panel reset button for >6.72s to force recovery from network lockup. IC Role / Device Role / Timing Role: MR1 input debounces mechanical switch closure; generates 140ms–280ms one-shot RESET pulse only after full 6.72s low assertion. Use Value: Eliminates need for external RC debounce or µP firmware polling - reduces BOM count and firmware development effort. |
Use Scenario: Embedded ARM processor in kiosk media player fails to respond to watchdog timer due to memory corruption. IC Role / Device Role / Timing Role: Acts as hardware-level fail-safe: if µP fails to toggle MR1 (via GPIO) within 6.72s window, hard reset is triggered. Use Value: Guarantees autonomous recovery without relying on software-based watchdogs vulnerable to code crashes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6444US23L+T | Identical specs except open-drain RESET output (vs. push-pull); same 2.313V threshold, 6.72s tMR, SOT143-4 package | Requires external pullup resistor to VCC or another logic rail; suited for level-shifting or wired-OR reset bus configurations | Select MAX6444US23L+T only if system requires open-drain flexibility; otherwise MAX6443US23L+T simplifies layout with push-pull drive |
| MAX6315US23D3+T | Lower 2.32V threshold (±1.5%), 200ms timeout (min), 1.6µA ICC at 3.6V, but no extended manual reset - MR input responds immediately | Lacks 6.72s debounce; unsuitable for front-panel switches without external filtering; better for low-power always-on monitoring | Choose MAX6315US23D3+T for ultra-low-current applications where manual reset is software-controlled or filtered externally |
Compared with MAX6444US23L+T, MAX6443US23L+T eliminates external pullup components and simplifies PCB routing; versus MAX6315US23D3+T, it provides robust mechanical switch interfacing at the cost of slightly higher supply current - making it optimal for consumer front-panel reliability.
Availability
MAX6443US23L+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable modems requiring stable component supply, long-life industrial qualification, and guaranteed -40°C to +85°C operation.
Supply support for MAX6443US23L+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, and interface applications, with emphasis on high-reliability industrial and consumer solutions.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in cost-sensitive consumer electronics, delivering extended manual reset immunity and guaranteed low-voltage reset validity without external components.
FAQ
What is the exact reset threshold voltage of the MAX6443US23L+T?
The MAX6443US23L+T has a factory-trimmed VCC reset threshold of 2.313V, with a guaranteed tolerance of ±12.5mV over the full -40°C to +85°C temperature range. This value is fixed and non-adjustable, corresponding to the "23" suffix in the part number per Table 1 of the datasheet.
How does the 6.72s manual reset setup period work on the MAX6443US23L+T?
The MAX6443US23L+T requires MR1 to be held low for a minimum of 6.72 seconds (the "L" suffix) before asserting RESET. Shorter pulses are ignored entirely. Once asserted, RESET remains low for 140ms (min) to 280ms (max), then deasserts automatically - no latching or external control is needed.
Does the MAX6443US23L+T support monitoring of multiple supply rails?
No, the MAX6443US23L+T monitors only the VCC supply rail. It does not include RSTIN or dual-supply monitoring capability. For multi-rail supervision, consider MAX6449US23L+T (which adds adjustable RSTIN input) or other members of the MAX6443–MAX6452 family with "RSTIN" pin.
Can the MAX6443US23L+T operate reliably when VCC drops below 1.5V?
Yes - the MAX6443US23L+T guarantees valid RESET assertion and logic state down to VCC = 1.0V. Its internal circuitry remains functional and RESET output meets VOL ≤0.3V and VOH ≥0.8×VCC specifications even at 1.0V, ensuring µP reset integrity during deep brownout.
What package type and pin count does the MAX6443US23L+T use?
The MAX6443US23L+T uses a 4-pin SOT143 package (outline 21-0052), with pinout: Pin 1 = GND, Pin 2 = VCC, Pin 3 = MR1, Pin 4 = RESET. It is RoHS-compliant, lead(Pb)-free, and qualified for reflow per JEDEC J-STD-020.
MAX6443US23L+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6443US23L+T FAQ
1.How can I place an order for MAX6443US23L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6443US23L+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 MAX6443US23L+T reliable?
The price and inventory of MAX6443US23L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6443US23L+T is usually 5 days.
3.What payment methods are accepted for MAX6443US23L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6443US23L+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6443US23L+T?
MAX6443US23L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6443US23L+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 MAX6443US23L+T?
For technical support, including MAX6443US23L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6443US23L+T requirements.
6.How does Aetrix verify that MAX6443US23L+T is sourced from the original manufacturer or authorized distributors?
All MAX6443US23L+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 MAX6443US23L+T meets industry standards.
7.What is the process for return or replacement of MAX6443US23L+T?
All MAX6443US23L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6443US23L+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 MAX6443US23L+T part is unused and in its original packaging.
Return procedure for MAX6443US23L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6443US23L+T 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…
