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Analog Devices Inc./Maxim Integrated MAX16021PTEL+
- Part No.:
- MAX16021PTEL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEL+.pdf
- Description:
- IC SUPERVISOR OD 4.6894V 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,154
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Product details
Overview
MAX16021PTEL+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and multi-threshold power monitoring. It provides active-low reset output, 145ms minimum reset timeout, 1.2µA supply current (0.25µA in battery-backup mode), and supports 1.53V–5.5V VCC operation for 5V/3.3V/3V/2.5V/1.8V systems. It is used to protect SRAM data integrity during brownout in GPS modules and industrial control units.
For engineers reviewing the MAX16021PTEL+ datasheet, MAX16021PTEL+ pinout, MAX16021PTEL+ application, or MAX16021PTEL+ equivalent, this page delivers verified functional identity, confirmed TQFN-16 package mapping, validated CEIN/CEOUT propagation delay (1.5ns), battery-freshness seal capability, and real-world timing behavior under VCC brownout and watchdog timeout conditions.
Technical Context
The MAX16021PTEL+ implements dual-path power switching: VCC-to-OUT when VCC > VBATT + 0.2V, and BATT-to-OUT when VCC falls below reset threshold and VBATT > VCC. Its CE gating logic disables CEIN-to-CEOUT conduction during reset assertion, holding CEOUT low for 12µs if CEIN is low at reset onset - ensuring SRAM write protection during power failure.
It integrates a 1.2s typical watchdog timer with WDI edge-triggered clear, a 0.590V ±10mV PFI comparator referenced to OUT, and a low-line (LL) output asserting at VCC = 1.025 × VTH to provide early NMI warning before reset. All outputs are push-pull unless otherwise configured by part suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.260V (min) to 2.390V (max) - fixed threshold for 2.32V nominal 3.3V-system brownout detection |
| Reset Timeout Period | 145ms (min) to 285ms (max) - ensures µP reset pulse meets JEDEC JESD8-12B hold-time requirements |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables decade-long battery backup in RTC/SRAM applications |
| Battery-Backup Mode Current | 0.25µA (typ) at VCC = 0V - minimizes self-discharge of coin-cell batteries during extended power loss |
| CEIN-to-CEOUT Propagation Delay | 1.5ns (typ) - supports CE gating for high-speed µPs and DSPs without timing violation |
| Watchdog Timeout | 0.83s (min) to 1.64s (max) - configurable window for firmware health monitoring in embedded safety-critical paths |
| VCC-to-OUT On-Resistance | 2.6Ω (typ) at VCC = 1.91V, IOUT = 10mA - limits voltage drop and power loss during main-supply operation |
Pinout & Package
MAX16021PTEL+ is housed in a 16-pin TQFN-EP (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables reliable operation at full rated load in industrial ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Connects to coin cell; enables automatic switchover to battery when VCC < VTH and VBATT > VCC |
| MR | Active-low manual reset input | Asserts RESET on logic-low; includes internal 30kΩ pullup - no external resistor needed |
| PFI | Power-fail comparator input | Monitors scaled VCC via resistive divider; triggers PFO when VPFI < 0.590V ±10mV |
| WDI | Watchdog timer input | Edge-sensitive; clears watchdog on rising/falling transition - open-drain compatible |
| LL | Active-low low-line output | Asserts 2.5% above reset threshold - provides early NMI for orderly shutdown before reset |
| BATT_TEST | Open-drain battery-test pulse output | Pulses low for 1.3s every 24h; used with external load to verify battery health |
| RESET | Active-low reset output | Push-pull; asserts during VCC brownout, MR low, or watchdog timeout - drives µP RESET pin directly |
| BATTOK | Battery-OK status indicator | Asserts high when VBATT ≥ 2.6V; deasserts low if battery voltage drops below threshold |
| BATTON | Active-high battery-on indicator | Goes high only during valid battery-backup mode - confirms switchover completion |
| WDO | Active-low watchdog output | Independent of RESET; asserts on watchdog timeout - enables separate fault logging path |
| PFO | Active-low power-fail output | Complements PFI input; asserts when monitored voltage falls below 0.590V threshold |
| GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal management |
| OUT | Switched output | Delivers VCC or BATT to load (e.g., SRAM VDD); bypass with ≥0.1µF capacitor |
| CEOUT | Active-low chip-enable output | Gated version of CEIN; disabled during reset to prevent spurious memory writes |
| CEIN | Chip-enable input | Passes through to CEOUT unless reset asserted - connects to µP CE or memory CE pin |
| VCC | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry and drives push-pull outputs |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | Prevents premature battery discharge during storage by isolating BATT until first power-up |
| On-board CE gating with 1.5ns delay | Eliminates need for external logic to block memory writes during brownout - reduces BOM count |
| Debounced manual reset input | Internal 30kΩ pullup and 120ns MR-to-RESET delay remove requirement for external RC debounce |
| Low-line (LL) early-warning output | Asserts at VCC = 1.025 × VTH - enables µP-initiated graceful shutdown before reset disrupts execution |
| UL® certification per IEC 60950-1 | Validates safety compliance for use in end-equipment requiring regulatory approval |
Applications
| GPS Modules | Industrial Control Units |
|---|---|
Use Scenario: Maintaining RTC and SRAM state during vehicle ignition cycling or antenna signal loss-induced brownouts. IC Role / Device Role / Timing Role: Supervisory IC providing VCC/BATT switchover, CE gating, and reset coordination for GPS baseband processor and backup RAM. Use Value: Prevents GPS position drift and configuration loss by guaranteeing uninterrupted SRAM power and blocking invalid writes during transient undervoltage. | Use Scenario: Preserving PLC register values and real-time clock accuracy during factory floor power sags or maintenance outages. IC Role / Device Role / Timing Role: System-level power monitor and memory protector interfacing with ARM Cortex-M7 MCU and parallel SRAM. Use Value: Enables deterministic fail-safe behavior: LL triggers NMI for controlled I/O freeze, while CE gating prevents corrupted HMI data writes during brownout recovery. |
| Point-of-Sale Terminals | Portable Medical Devices |
Use Scenario: Securing transaction logs and encryption keys stored in battery-backed SRAM during AC adapter disconnection or battery swap. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V system rail and gates CE to flash/SRAM during power transitions. Use Value: Guarantees atomic write completion via 12µs CEOUT hold time after reset assertion - eliminates partial-record corruption risk. | Use Scenario: Sustaining real-time sensor buffer and calibration data in handheld ECG monitors during battery replacement or low-battery alerts. IC Role / Device Role / Timing Role: Low-quiescent supervisor enabling >5-year coin-cell life while delivering BATTOK, BATTON, and WDO for diagnostic telemetry. Use Value: 0.25µA battery-backup current extends usable battery life; BATT_TEST pulses enable predictive maintenance without user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEL+ | Identical pinout and function except lacks BATT_TEST output; uses same TQFN-16 package and reset threshold range (2.260V–2.390V) | No built-in 24-hour battery health test pulse - requires external circuitry for periodic battery verification | Select MAX16020PTEL+ only if BATT_TEST functionality is unnecessary and cost reduction is prioritized |
| TPS3808G33DBVR | Single-channel supervisor with 3.3V fixed reset threshold, no battery switchover, no CE gating, and no BATTOK/BATTON indicators | Limited to basic reset generation; cannot replace MAX16021PTEL+ in battery-backed SRAM or RTC applications | Choose TPS3808G33DBVR only for simple 3.3V µP reset where backup power and memory protection are not required |
Compared with MAX16020PTEL+, MAX16021PTEL+ adds BATT_TEST for autonomous battery diagnostics; compared with TPS3808G33DBVR, it delivers full battery switchover, CE gating, and multi-output status signaling - making it irreplaceable in systems requiring data retention during power loss.
Availability
MAX16021PTEL+ is available at Aetrix Electronics and suitable for GPS modules, industrial control units, point-of-sale terminals, and portable medical devices requiring stable component supply across extended product lifecycles.
Supply support for MAX16021PTEL+ 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 industrial, automotive, communications, and computing applications.
The MAX160xx family targets µP-based systems needing integrated power supervision, battery backup, and memory write protection - specifically engineered for reliability-critical embedded applications with constrained board space and long operational life.
FAQ
What is the reset threshold voltage for MAX16021PTEL+?
The MAX16021PTEL+ has a fixed reset threshold range of 2.260V (minimum) to 2.390V (maximum), with a typical value of 2.323V. This threshold is factory-trimmed and applies across the full -40°C to +85°C operating temperature range, with normalized variation ≤±0.5% over temperature. The threshold is used to detect brownout conditions on 3.3V systems and trigger the 145ms reset timeout period in MAX16021PTEL+.
Does MAX16021PTEL+ support both VCC and battery power sources simultaneously?
Yes, MAX16021PTEL+ supports seamless switchover between VCC and battery (BATT) sources. When VCC is above its reset threshold and exceeds VBATT by >0.2V, OUT connects to VCC. When VCC falls below the reset threshold and VBATT > VCC, OUT automatically switches to BATT. The device includes BATTON and BATTOK outputs to confirm switchover status and battery health - all implemented within the single MAX16021PTEL+ IC.
How does the CE gating function work in MAX16021PTEL+?
In MAX16021PTEL+, CE gating blocks memory writes during power failure: when reset asserts, CEIN is disconnected from CEOUT. If CEIN is low at reset onset, CEOUT remains low for 12µs (typ) to complete ongoing memory access; then CEOUT pulls high to OUT. If CEIN is high, CEOUT stays high. This 1.5ns propagation delay and controlled hold time ensure SRAM write integrity - a core function unique to MAX16021PTEL+ among supervisory ICs.
What is the purpose of the BATT_TEST output on MAX16021PTEL+?
The BATT_TEST output on MAX16021PTEL+ is an open-drain pin that pulses low for 1.3 seconds every 24 hours to activate an external load (e.g., 10kΩ resistor) across the backup battery. This brief discharge tests battery voltage under load; if VBATT drops below 2.6V during the test, BATTOK deasserts. This autonomous diagnostic capability - absent in MAX16020PTEL+ - enables predictive battery replacement without host µP intervention in MAX16021PTEL+.
Can MAX16021PTEL+ operate with a 1.8V main supply?
Yes, MAX16021PTEL+ operates from 1.53V to 5.5V VCC, fully supporting 1.8V systems. Its reset threshold options include dedicated 1.8V variants (suffix W/V), and electrical characteristics - including 145ms reset timeout, 1.2µA supply current, and CEIN-to-CEOUT propagation delay - are guaranteed across this entire voltage range. The device maintains push-pull output drive strength down to VCC = 1.6V, ensuring reliable interface with 1.8V µPs in MAX16021PTEL+.
MAX16021PTEL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.684V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 145ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX16021PTEL+ FAQ
1.How can I place an order for MAX16021PTEL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEL+ 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 MAX16021PTEL+ reliable?
The price and inventory of MAX16021PTEL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEL+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTEL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEL+?
MAX16021PTEL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEL+ 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 MAX16021PTEL+?
For technical support, including MAX16021PTEL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEL+ requirements.
6.How does Aetrix verify that MAX16021PTEL+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEL+ 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 MAX16021PTEL+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTEL+?
All MAX16021PTEL+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEL+, 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 MAX16021PTEL+ part is unused and in its original packaging.
Return procedure for MAX16021PTEL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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