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Analog Devices Inc./Maxim Integrated MAX16038PLA29+T
- Part No.:
- MAX16038PLA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-WFDFN
- Datasheet:
-
MAX16038PLA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
The MAX16038PLA29+T from Maxim Integrated is an 8-pin μDFN supervisory IC with watchdog timer, active-low open-drain reset output, and 2.93V factory-set reset threshold. It monitors VCC (1.2V–5.5V), asserts reset during brownout or software hang, switches SRAM supply to backup battery when VCC drops below threshold, and operates across –40°C to +85°C. Used in portable POS terminals for reliable power-up sequencing and data retention during main power loss.
For engineers reviewing the MAX16038PLA29+T datasheet, MAX16038PLA29+T pinout, MAX16038PLA29+T application, or MAX16038PLA29+T equivalent, key selection criteria include its 1.6s watchdog timeout, 13µA quiescent current, 2.93V reset threshold accuracy (±70mV), and compatibility with battery-backed CMOS RAM systems requiring fail-safe chip-enable gating and power-fail warning.
Technical Context
The MAX16038PLA29+T implements a dedicated watchdog timer with 1.00–2.25s timeout range and edge-triggered reset clearing logic-asserting RESET pulses on WDI stall detection. Its internal 1.235V reference enables precise PFI and RESETIN comparators, while the battery switchover path uses MOSFET-based VCC/BATT selection with 40mV hysteresis to prevent oscillation during slow VCC decay.
This device belongs to the MAX16033–MAX16040 family of low-power supervisory circuits optimized for space-constrained µP systems. It excludes manual-reset (MR) and chip-enable (CEIN/CEOUT) functions present in 10-pin variants, instead integrating only WDI, PFI, PFO, RESET, BATTON, OUT, BATT, and GND-enabling minimal footprint monitoring of critical supply rails and software execution integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±70mV - ensures reliable reset assertion at 3.0V nominal supply brownout |
| Watchdog Timeout | 1.65s typical - provides sufficient margin for firmware loops without false triggers |
| Quiescent Current | 13µA at 2.8V - enables multi-year battery backup in always-on portable equipment |
| Operating Voltage | 1.2V to 5.5V - supports direct interface with 1.8V, 2.5V, 3.3V, and 5V µP domains |
| Reset Timeout | 140ms minimum - guarantees µP initialization completes before release from reset |
| Output Type | Active-low open-drain RESET - allows wired-OR configuration with other system reset sources |
| Package | 2mm × 2mm, 8-pin μDFN - fits high-density PCB layouts in handheld and embedded modules |
Pinout & Package
Package: 2mm × 2mm, 8-pin μDFN, exposed pad, RoHS-compliant, tape-and-reel (T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low open-drain reset output | Drives external µP reset input low during VCC brownout, watchdog timeout, or power failure; requires external pullup |
| 2 (PFI) | Power-fail input | Monitors auxiliary supply via resistor divider; trips PFO when voltage falls below 1.235V |
| 3 (GND) | Ground reference | Common return for all analog and digital circuitry; connects to exposed thermal pad |
| 4 (WDI) | Watchdog input | Edge-sensitive input - rising/falling transitions reset internal 1.65s timer; stall >2.25s triggers reset pulse |
| 5 (PFO) | Active-low power-fail output | Open-drain signal asserted when PFI < 1.235V or VCC < reset threshold; used for NMI or interrupt |
| 6 (VCC) | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and supplies OUT during normal operation |
| 7 (OUT) | SRAM power output | Switches between VCC and BATT based on voltage comparison; delivers up to 200mA from VCC |
| 8 (BATT) | Battery backup input | Connects to 2.1V–5.5V backup source; activates switchover when VCC < VTH and VCC < VBATT −40mV |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with edge-clearing logic | Prevents spurious resets from noise; requires periodic WDI toggling to maintain µP operation |
| Factory-trimmed 2.93V reset threshold | Eliminates external resistor network - reduces BOM count and layout area in cost-sensitive designs |
| 13µA supply current at 2.8V | Extends battery life in backup mode - draws only 2µA from battery when VCC = 0V |
| 40mV hysteresis on battery switchover | Prevents rapid ON/OFF cycling during slow VCC decay - ensures stable SRAM power during brownout recovery |
| Active-low open-drain RESET and PFO | Enables flexible system-level reset arbitration and interrupt routing without level-shifting components |
Applications
| Portable POS Terminals | Critical µP Power Monitoring |
|---|---|
Use Scenario: Battery-powered retail terminals performing credit card transactions during AC power interruption. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET to halt µP execution, switching SRAM supply to backup battery, and signaling power-fail via PFO to trigger graceful shutdown. Use Value: Prevents data corruption in transaction logs by maintaining SRAM power and halting writes during unstable VCC conditions. | Use Scenario: Industrial controller requiring guaranteed µP reset during 12V rail brownout caused by motor startup. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply derived from 12V; asserts RESET within 25µs of VCC falling below 2.93V and holds for ≥140ms. Use Value: Eliminates need for discrete RC reset circuits - improves timing accuracy and temperature stability over –40°C to +85°C. |
| Set-Top Boxes | Real-Time Clock Backup |
Use Scenario: Consumer STB losing main power while recording live TV to internal flash storage. IC Role / Device Role / Timing Role: Detects 5V supply collapse, asserts RESET to freeze µP state, switches RTC/SRAM power to coin cell, and signals PFO to save buffer contents. Use Value: Ensures uninterrupted timekeeping and prevents partial write corruption in flash memory during unexpected power loss. | Use Scenario: Embedded meter with RTC retaining time/date during 10-year battery life. IC Role / Device Role / Timing Role: Provides ultra-low-current (2µA) battery backup path to RTC VDD; asserts BATTON to enable external pass transistor for higher load current. Use Value: Reduces total backup current to sub-µA levels - extends coin-cell lifetime beyond 10 years without compromising switchover speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16034PLA29+T | 10-pin μDFN; includes CEIN/CEOUT gating and MR input - adds chip-enable control not present in MAX16038PLA29+T | Required where µP CE line must be disabled during reset to prevent RAM corruption | Select MAX16034PLA29+T only if CE gating or manual reset functionality is needed; otherwise MAX16038PLA29+T offers smaller footprint and lower cost |
| TPS3808G33DBVR | 3.3V fixed reset threshold; no watchdog or battery switchover - lacks backup power management and WDI monitoring | Suitable for simple reset-only applications without battery backup or software supervision | Choose TPS3808G33DBVR only for basic reset generation; MAX16038PLA29+T is required when battery switchover, watchdog, and PFI monitoring are mandatory |
Compared with MAX16034PLA29+T, the MAX16038PLA29+T saves board space and cost by omitting unused CEIN/CEOUT and MR pins, while retaining identical watchdog, reset, and battery switchover performance. Compared with TPS3808G33DBVR, it delivers integrated power-fail warning, battery backup control, and software supervision - eliminating three discrete components in battery-critical systems.
Availability
MAX16038PLA29+T is available at Aetrix Electronics and suitable for portable POS terminals, set-top boxes, industrial controllers, and real-time clock backup systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16038PLA29+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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX16033–MAX16040 product line delivers integrated power-supply supervision, battery switchover, and watchdog functionality in miniature μDFN packages - targeting space-constrained µP systems needing high reliability and ultra-low quiescent current.
FAQ
What is the factory-set reset threshold voltage for MAX16038PLA29+T?
The MAX16038PLA29+T has a factory-set reset threshold of 2.93V, with guaranteed tolerance of ±70mV over –40°C to +85°C. This value is laser-trimmed during production and does not require external resistors. The '29' suffix in MAX16038PLA29+T explicitly denotes the 2.93V threshold variant per Maxim's ordering guide.
Does MAX16038PLA29+T support battery backup for SRAM, and how does switchover work?
Yes, MAX16038PLA29+T supports battery backup for SRAM via its OUT pin. When VCC falls below 2.93V and remains below VBATT minus 40mV hysteresis, the internal MOSFET connects BATT to OUT. The device draws only 2µA from the battery in backup mode (VBATT = 2.8V, VCC = 0V), enabling multi-year operation on coin cells. MAX16038PLA29+T does not power up from BATT alone - VCC must be present at startup.
What is the watchdog timeout behavior of MAX16038PLA29+T, and how is it cleared?
The MAX16038PLA29+T watchdog has a typical timeout of 1.65s, with min/max of 1.00s/2.25s. It is cleared on any rising or falling edge at the WDI pin - not just periodic toggling. If WDI remains static longer than the timeout, RESET pulses low for ≥140ms. The watchdog also clears automatically whenever RESET is asserted, preventing lockout during debug or initialization sequences.
Can MAX16038PLA29+T generate a power-fail interrupt, and what is the PFI threshold?
Yes, MAX16038PLA29+T provides a power-fail interrupt via the open-drain PFO pin. The internal PFI comparator trips when the voltage at the PFI pin falls below 1.235V, with ±50mV tolerance. Users configure the trip point for any supply rail using a resistor divider - e.g., to monitor a 5V rail, use R1/R2 = 3.05 for 5.0V threshold. PFO also asserts when VCC drops below the 2.93V reset threshold.
Is MAX16038PLA29+T pin-compatible with other devices in the MAX16033–MAX16040 family?
No, MAX16038PLA29+T is an 8-pin μDFN device and is not pin-compatible with 10-pin variants like MAX16034PLA29+T. While both share identical reset threshold, watchdog, and battery switchover functionality, MAX16038PLA29+T omits CEIN, CEOUT, and MR pins. Board redesign is required to substitute between 8-pin and 10-pin packages - refer to Pin Description table in MAX16038PLA29+T datasheet for exact terminal mapping.
MAX16038PLA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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:
- 8-µDFN (2x2)
MAX16038PLA29+T FAQ
1.How can I place an order for MAX16038PLA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16038PLA29+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 MAX16038PLA29+T reliable?
The price and inventory of MAX16038PLA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16038PLA29+T is usually 5 days.
3.What payment methods are accepted for MAX16038PLA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16038PLA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16038PLA29+T?
MAX16038PLA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16038PLA29+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 MAX16038PLA29+T?
For technical support, including MAX16038PLA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16038PLA29+T requirements.
6.How does Aetrix verify that MAX16038PLA29+T is sourced from the original manufacturer or authorized distributors?
All MAX16038PLA29+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 MAX16038PLA29+T meets industry standards.
7.What is the process for return or replacement of MAX16038PLA29+T?
All MAX16038PLA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16038PLA29+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 MAX16038PLA29+T part is unused and in its original packaging.
Return procedure for MAX16038PLA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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