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Analog Devices Inc./Maxim Integrated MAX6400BS29-T
- Part No.:
- MAX6400BS29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 4-WFBGA, CSPBGA
- Datasheet:
-
MAX6400BS29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 4UCSP
- Quantity:
- Payment:
- Shipping:
Inventory:6,900
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Product details
Overview
MAX6400BS29-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit in a 4-bump UCSP package, designed to monitor VCC supply voltage and assert an active-low push-pull reset signal when voltage falls below 2.93V (±2.5% over -40°C to +85°C). It features 500nA typical supply current, 100ms minimum reset timeout, manual reset input with internal 50kΩ pullup, and guaranteed reset validity down to VCC = 1.0V. Used in battery-powered portable electronics for reliable power-on/brownout reset control.
For engineers reviewing the MAX6400BS29-T datasheet, MAX6400BS29-T pinout, MAX6400BS29-T application, or MAX6400BS29-T equivalent, key selection criteria include its 2.93V factory-trimmed threshold, push-pull active-low output configuration, UCSP-4 packaging, immunity to sub-200ns VCC transients, and compatibility with systems requiring reset assertion at VCC ≥ 1.0V.
Technical Context
The MAX6400BS29-T integrates a precision bandgap reference comparator with factory-trimmed 2.93V reset threshold and ±2.5% accuracy across -40°C to +85°C. Its internal timer ensures a minimum 100ms reset timeout after VCC rises above VTH, and it guarantees correct logic state down to VCC = 1.0V.
It supports manual reset via MR pin with 1µs minimum pulse width, 100ns glitch rejection, and 200ns MR-to-reset delay. The push-pull output drives low with VOL ≤ 0.4V at ISINK = 100µA (VCC ≥ 1.2V) and high with VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.1V), eliminating need for external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.93V ±2.5% (–40°C to +85°C); ensures reliable brownout detection at nominal 2.93V supply level |
| Supply Current (ICC) | 500nA typical at VCC = 3.0V; enables multi-year battery life in always-on portable devices |
| Reset Timeout (tRP) | 100ms minimum; provides sufficient hold time for microprocessor initialization sequences |
| Operating Voltage Range | 1.2V to 5.5V (–40°C to +85°C); supports operation down to near-dead battery levels |
| MR Input Logic | Active-low with internal 50kΩ pullup; allows direct switch-to-GND connection without external components |
| Output Type | Push-pull, active-low RESET; eliminates need for external pullup resistor and supports direct µP reset pin drive |
| VCC Transient Immunity | Rejects negative transients <200ns (at 100mV overdrive); prevents false resets during switching noise |
Pinout & Package
MAX6400BS29-T is housed in a 4-bump, 2×2 mm chip-scale package (UCSP-4), optimized for ultra-compact portable designs. The package uses solder bumps directly on die surface and requires specific PCB layout and reflow profile per Maxim's UCSP reliability guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | GND | Ground reference for all internal circuitry and reset comparator |
| B1 | RESET | Active-low push-pull output; drives low during reset assertion, high otherwise; no external pullup needed |
| B2 | MR | Active-low manual reset input; internally pulled up to VCC; asserts reset when pulled to GND |
| A2 | VCC | Supply voltage input and monitored rail; powers device and serves as reset threshold reference |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 500nA typical supply current enables >10-year battery life in coin-cell–powered devices |
| Factory-trimmed VTH | 2.93V threshold with ±2.5% tolerance over full temperature range eliminates calibration overhead |
| Guaranteed reset at VCC = 1.0V | Ensures valid reset signaling even during deep brownout or end-of-battery conditions |
| Integrated MR pullup | 50kΩ internal resistor allows single-switch manual reset without external components |
| No external components required | Complete supervisory function in one die - no capacitors, resistors, or trimming needed |
Applications
| Cell Phones | MP3 Players |
|---|---|
Use Scenario: Power-up sequencing and low-battery brownout recovery in GSM/CDMA handsets with Li-ion batteries. IC Role / Device Role / Timing Role: Monitors VCC rail and asserts active-low RESET to halt CPU execution until stable 2.93V+ supply is confirmed. Use Value: Prevents corrupted boot firmware execution during marginal battery voltage transitions. |
Use Scenario: Reset coordination during USB charging events and battery voltage sag in flash-based audio players. IC Role / Device Role / Timing Role: Generates 100ms+ reset pulse upon VCC drop below 2.93V, ensuring clean DSP and memory controller initialization. Use Value: Eliminates audio artifacts and file system corruption caused by partial power-up states. |
| Pagers | PDAs |
Use Scenario: Maintaining deterministic startup behavior in two-way pagers operating on primary alkaline cells. IC Role / Device Role / Timing Role: Supervises main 3.0V supply and triggers reset when voltage decays below 2.93V during discharge curve tail. Use Value: Guarantees message reception integrity by preventing processor lockup during low-VCC operation. |
Use Scenario: Coordinating reset timing between ARM core, SDRAM, and display controller during cold start and wake-from-sleep. IC Role / Device Role / Timing Role: Provides synchronized, 100ms minimum active-low reset pulse referenced to 2.93V VCC threshold. Use Value: Avoids race conditions and bus contention during multi-chip power-up sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6400BS28-T | 2.80V reset threshold (vs. 2.93V); same UCSP-4 package, push-pull active-low output, 500nA ICC | Suitable where system brownout margin requires earlier reset assertion at lower VCC | Select when design operates near 2.8V nominal supply or requires tighter brownout headroom |
| MAX6403BS33-T | 3.30V reset threshold; same 500nA ICC, UCSP-4, push-pull active-low; higher VTH targets 3.3V systems | Designed for 3.3V logic domains; not suitable for 2.93V-critical 3.0V systems without margin analysis | Choose only if system VCC nominal is ≥3.3V and brownout detection must align with 3.3V rail stability |
Compared with MAX6400BS29-T, the MAX6400BS28-T offers earlier reset at 2.80V for deeper brownout protection, while the MAX6403BS33-T shifts detection to 3.30V for compatibility with standard 3.3V I/O domains - neither is pin-compatible nor functionally interchangeable without verifying system-level voltage margins and timing requirements.
Availability
MAX6400BS29-T is available at Aetrix Electronics and suitable for portable electronics, battery-powered instrumentation, and handheld communication devices requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6400BS29-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX6400–MAX6405 family was designed specifically for ultra-low-power microprocessor supervision in space-constrained portable equipment, emphasizing minimal quiescent current, factory-trimmed accuracy, and chip-scale integration.
FAQ
What is the exact reset threshold voltage of the MAX6400BS29-T?
The MAX6400BS29-T has a factory-trimmed nominal reset threshold of 2.93V, with ±2.5% accuracy over the full operating temperature range of –40°C to +85°C. At +25°C, the typical threshold is 2.93V, and the min/max limits are 2.857V and 3.000V respectively, as specified in Table 1 of the datasheet.
Does the MAX6400BS29-T require an external pullup resistor on the RESET pin?
No, the MAX6400BS29-T features a push-pull active-low RESET output, so it actively drives both high and low states without needing an external pullup resistor. This simplifies board layout and reduces BOM count compared to open-drain alternatives like the MAX6402BS29-T.
Can the MAX6400BS29-T operate reliably at VCC = 1.2V?
Yes, the MAX6400BS29-T is fully specified to operate from VCC = 1.2V to 5.5V over –40°C to +85°C. Its reset output remains valid and correctly asserted down to VCC = 1.0V, making it suitable for applications where supply voltage may dip close to battery depletion.
What is the function of the MR pin on the MAX6400BS29-T?
The MR (Manual Reset) pin on the MAX6400BS29-T is an active-low input with an internal 50kΩ pullup to VCC. Pulling MR to GND asserts RESET, and the device holds reset active for the full 100ms timeout period after MR returns high. It supports direct switch-to-ground connection without external components.
Is the MAX6400BS29-T compatible with 3.3V microcontrollers?
Yes, the MAX6400BS29-T is compatible with 3.3V microcontrollers: its VCC range includes 3.3V, its RESET output drives high to ≥0.8×VCC (≥2.64V at 3.3V), and low to ≤0.4V - well within standard 3.3V CMOS logic thresholds. Its 2.93V threshold also provides appropriate margin for 3.3V system brownout detection.
MAX6400BS29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 4-WFBGA, CSPBGA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-UCSP (1.05x1.05)
MAX6400BS29-T FAQ
1.How can I place an order for MAX6400BS29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6400BS29-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 MAX6400BS29-T reliable?
The price and inventory of MAX6400BS29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6400BS29-T is usually 5 days.
3.What payment methods are accepted for MAX6400BS29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6400BS29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6400BS29-T?
MAX6400BS29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6400BS29-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 MAX6400BS29-T?
For technical support, including MAX6400BS29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6400BS29-T requirements.
6.How does Aetrix verify that MAX6400BS29-T is sourced from the original manufacturer or authorized distributors?
All MAX6400BS29-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 MAX6400BS29-T meets industry standards.
7.What is the process for return or replacement of MAX6400BS29-T?
All MAX6400BS29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6400BS29-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 MAX6400BS29-T part is unused and in its original packaging.
Return procedure for MAX6400BS29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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