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Analog Devices Inc./Maxim Integrated MAX16021PTET+
- Part No.:
- MAX16021PTET+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTET+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
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Product details
Overview
MAX16021PTET+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and power-fail 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 operation for 5V/3.3V/3V/2.5V/1.8V systems. It is used to protect SRAM data integrity during main power loss in real-time clock and portable equipment.
For engineers reviewing the MAX16021PTET+ datasheet, MAX16021PTET+ pinout, MAX16021PTET+ application, or MAX16021PTET+ equivalent, key selection criteria include its dual-supply switchover behavior, CEIN-to-CEOUT 1.5ns propagation delay, battery-OK/battery-on indicators, and compatibility with µP-based systems requiring brownout write protection and orderly shutdown via LL output.
Technical Context
The MAX16021PTET+ integrates four core functions: (1) VCC-monitored reset generation with 145–285ms timeout and fixed thresholds (e.g., 3.100V typ); (2) automatic VCC-to-battery switchover when VCC falls below reset threshold and VBATT > VCC; (3) CE signal gating with 1.5ns propagation delay and 12µs hold time during reset; and (4) auxiliary supervision including watchdog timer (1.235s typ), power-fail comparator (0.590V threshold), and low-line indicator (2.5% above reset threshold).
It features push-pull or open-drain outputs (MAX16021PTET+ uses push-pull RESET and WDO), operates across –40°C to +85°C, and is housed in a 16-pin TQFN package with exposed pad. Its CE gating logic actively pulls CEOUT to OUT during disconnect, ensuring CMOS memory write protection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.100V typical (suffix 'T'), ±1.5% over temperature - ensures reliable µP reset at defined VCC brownout level |
| Reset Timeout Period | 145ms minimum - guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | 5µA max at VCC = 5.5V - enables ultra-low-power operation in always-on backup systems |
| Battery-Backup Current | 0.25µA typical at VCC = 0V - minimizes battery drain during extended main-power outage |
| CEIN-to-CEOUT Propagation Delay | 1.5ns typical (50Ω source, 50pF load) - supports high-speed µP/DSP interfaces without timing violation |
| Watchdog Timeout | 1.235s typical - provides deterministic system recovery if firmware hangs or fails to toggle WDI |
| Power-Fail Comparator Threshold | 0.590V ±19mV - allows precise low-voltage monitoring down to sub-1V rails using external divider |
Pinout & Package
MAX16021PTET+ is packaged in a 16-pin 4mm × 4mm TQFN with exposed pad (EP), rated for –40°C to +85°C operation. The EP is internally connected to GND and must be soldered to a large ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Connects to backup cell; enables automatic switchover to battery when VCC drops below reset threshold and VBATT > VCC |
| MR | Active-low manual reset input | Asserts reset on logic-low pulse; includes internal 30kΩ pullup - eliminates need for external resistor |
| PFI | Power-fail comparator input | Accepts resistive divider output; referenced to 0.590V internal threshold - enables custom low-voltage detection |
| WDI | Watchdog timer input | Edge-sensitive; clears watchdog on rising/falling transition - supports both active and three-state drivers |
| LL | Active-low low-line output | Asserts ~2.5% above reset threshold - provides early warning NMI for controlled software shutdown |
| BATT_TEST | Open-drain battery-test output | Pulses low for 1.3s every 24h - enables periodic verification of battery health without external controller |
| BATTOK | Battery-OK status output | Goes low when VBATT < 2.6V - signals end-of-life condition for backup battery |
| BATTON | Active-high battery-on indicator | Asserts only during valid battery-backup mode - confirms switchover has occurred and backup is active |
| WDO | Active-low watchdog output | Asserts on WDI timeout; deasserts on next WDI edge or reset - provides independent fault signaling path |
| PFO | Active-low power-fail output | Asserts when PFI falls below 0.590V - drives external interrupt or latch without µP involvement |
| GND | Ground reference | Primary return path; EP is internally tied to GND - requires solid thermal grounding |
| RESET | Active-low reset output | Push-pull driver; VOL ≤ 0.3V at 1mA - directly interfaces with µP reset pin without pullup |
| OUT | Switched output | Delivers VCC or BATT to load; RON ≤ 5.5Ω at 1.91V - powers SRAM or RTC with minimal dropout |
| CEOUT | Active-low chip-enable output | Controlled by CEIN and reset state; pulled up to OUT - gates memory writes during brownout |
| CEIN | Chip-enable input | Directly connects to µP CE signal; low-resistance pass-through during normal operation - no added latency |
| VCC | Main supply input | 1.53V–5.5V operation; bypass with 0.1µF capacitor - powers all internal circuits except battery monitor |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | 20nA max leakage at VBATT = 5.5V - preserves shelf life of backup battery before first use |
| On-board CE gating | 1.5ns CEIN-to-CEOUT propagation delay - maintains timing integrity for high-speed memory interfaces |
| Debounced manual reset | 120ns MR-to-reset delay with internal 30kΩ pullup - eliminates external RC network and PCB space |
| Low-line indicator (LL) | 2.5% higher threshold than reset voltage - delivers nonmaskable interrupt before reset for graceful shutdown |
| UL® certification (IEC 60950-1) | Validated safety compliance - simplifies end-equipment regulatory approval for industrial and medical use |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
Use Scenario: Maintaining accurate timekeeping and calendar data during AC power loss in smart meters or IoT gateways. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-battery switchover and BATTON assertion to signal backup activation. Use Value: Ensures RTC continues operating with <0.25µA battery draw and zero time loss during main power interruption. |
Use Scenario: Preventing corrupted writes to static RAM during brownout in point-of-sale terminals or industrial controllers. IC Role / Device Role / Timing Role: CE gating controller disabling memory access within 12µs of reset assertion while holding CEOUT stable. Use Value: Eliminates need for external logic or FPGA-based write-protection, reducing BOM count and layout complexity. |
| GPS Module Power Management | Portable Medical Device Monitoring |
Use Scenario: Preserving satellite almanac and position fix data during vehicle ignition cycling or battery replacement. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting BATTOK and BATTON to validate backup readiness and trigger data save routines. Use Value: Enables fast cold-start acquisition by retaining ephemeris data across power cycles with <50nA standby leakage. |
Use Scenario: Safeguarding patient parameter logs and configuration settings during battery swap in handheld diagnostic tools. IC Role / Device Role / Timing Role: System monitor generating LL interrupt for firmware-initiated data flush prior to reset assertion. Use Value: Guarantees full log persistence with deterministic 145ms reset window and verified battery-health feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTET+ | Identical pinout and function, but lacks BATT_TEST output - no built-in 24-hour battery self-test pulse | Suitable where periodic battery health verification is handled externally or not required | Select MAX16020PTET+ when BATT_TEST functionality is unnecessary and cost optimization is prioritized |
| TPS3808G33DBVR | Single-supply reset IC only; no battery switchover, CE gating, or BATTOK/BATTON outputs - lacks backup management capability | Applicable only for basic reset supervision without backup power control or memory write protection | Choose TPS3808G33DBVR only if system uses separate battery management and does not require integrated CE gating |
Compared with MAX16021PTET+, MAX16020PTET+ offers identical supervision and gating but omits autonomous battery testing, while TPS3808G33DBVR provides only reset functionality - making MAX16021PTET+ uniquely suited for systems requiring coordinated backup power, memory protection, and health monitoring in one IC.
Availability
MAX16021PTET+ is available at Aetrix Electronics and suitable for real-time clock backup, CMOS SRAM write protection, and portable medical device monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX16021PTET+ 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, automotive, and communications applications.
The MAX16021PTET+ belongs to Maxim's µP supervisory product line, engineered specifically for systems requiring integrated battery backup control, memory write protection, and multi-level power monitoring in space-constrained, low-power environments.
FAQ
What is the reset threshold voltage for MAX16021PTET+?
The MAX16021PTET+ has a nominal reset threshold of 3.100V (typical), with a range of 3.010V to 3.190V across temperature and process variation. This value is fixed per the 'T' suffix in the part number and is guaranteed over the full –40°C to +85°C operating range without external adjustment.
Does MAX16021PTET+ support both VCC and battery power sources simultaneously?
Yes, MAX16021PTET+ automatically switches the OUT pin between VCC and BATT based on voltage conditions: OUT connects to VCC when VCC ≥ 1.01 × VBATT and VCC is above reset threshold; it connects to BATT only when VCC falls below reset threshold and VBATT > VCC - enabling seamless backup without external MOSFETs or diodes.
How does the CE gating function work in MAX16021PTET+?
In MAX16021PTET+, CEIN is passed directly to CEOUT during normal operation. When RESET asserts, CEOUT is held low for 12µs if CEIN was low at assertion time; otherwise, CEOUT remains high. After 12µs, CEOUT is actively pulled up to OUT - preventing spurious memory writes during brownout while maintaining signal integrity.
What is the purpose of the BATT_TEST pin on MAX16021PTET+?
The BATT_TEST pin on MAX16021PTET+ pulses low for 1.3 seconds every 24 hours to enable automatic battery voltage testing. During this pulse, an external load can be applied to verify VBATT remains above 2.6V; if not, BATTOK deasserts - providing autonomous health monitoring without host processor intervention.
Can MAX16021PTET+ operate with a 1.8V main supply?
Yes, MAX16021PTET+ supports VCC from 1.53V to 5.5V and includes factory-trimmed reset thresholds for 1.8V systems (e.g., suffix 'W' = 1.661V typ). Its 0.25µA battery-backup current and 1.5ns CE propagation delay make it suitable for low-voltage, high-reliability applications such as portable sensors and wearables.
MAX16021PTET+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.1V
- 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)
MAX16021PTET+ FAQ
1.How can I place an order for MAX16021PTET+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTET+ 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 MAX16021PTET+ reliable?
The price and inventory of MAX16021PTET+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTET+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTET+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTET+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTET+?
MAX16021PTET+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTET+ 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 MAX16021PTET+?
For technical support, including MAX16021PTET+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTET+ requirements.
6.How does Aetrix verify that MAX16021PTET+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTET+ 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 MAX16021PTET+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTET+?
All MAX16021PTET+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTET+, 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 MAX16021PTET+ part is unused and in its original packaging.
Return procedure for MAX16021PTET+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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