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Analog Devices Inc./Maxim Integrated MAX16021PTER+
- Part No.:
- MAX16021PTER+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTER+.pdf
- Description:
- IC SUPERVISOR OD 2.640V 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:525
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Product details
Overview
MAX16021PTER+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and power-fail monitoring. It monitors 1.8V–5V supplies, provides 145ms reset timeout, 1.2µA supply current, and active-low/open-drain RESET output. It enables reliable memory write protection and RTC backup in brownout conditions.
For engineers reviewing the MAX16021PTER+ datasheet, MAX16021PTER+ pinout, MAX16021PTER+ application, or MAX16021PTER+ equivalent, this page delivers verified technical context, pin-level design meaning, real-world use cases for industrial and portable systems, and two validated alternative parts with documented functional differences.
Technical Context
The MAX16021PTER+ integrates four core supervisory functions: µP reset generation during VCC power-up/down/brownout; automatic VCC-to-battery switchover when VCC falls below VBATT and reset threshold; CE signal gating with 1.5ns propagation delay to prevent memory corruption; and dual watchdog timer (1.2s timeout) with WDI edge-triggered clear logic.
It features a dedicated low-line (LL) comparator asserting 2.5% above reset threshold for early brownout warning, battery-OK (BATTOK) and battery-on (BATTON) indicators, and PFI/PFO circuitry monitoring down to 0.6V with 30mV hysteresis - all operating across -40°C to +85°C with UL® IEC 60950-1 certification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.260V (min) to 2.390V (max) - fixed threshold for 2.5V system monitoring with ±1.5% temp stability |
| Reset Timeout Period | 145ms (min) to 285ms (max) - ensures sufficient hold time for µP initialization after power recovery |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables multi-year operation in battery-backed RTC/CMOS memory applications |
| Battery-Backup Mode Current | 0.25µA (typ) - minimizes drain on backup cell during extended main-power loss |
| CEIN to CEOUT Propagation Delay | 1.5ns (typ) - supports high-speed µP/DSP interfaces without timing violation in CE-gated memory access |
| Watchdog Timeout | 0.83s (min) to 1.64s (max) - provides configurable software supervision window for embedded firmware recovery |
| PFI Threshold Accuracy | 0.572V to 0.611V with 30mV hysteresis - enables precise low-voltage detection for power-fail interrupt generation |
Pinout & Package
MAX16021PTER+ is housed in a 16-pin TQFN package (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W supports operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Connects to 2.1–5.5V backup source; enables automatic switchover when VCC < VBATT and VCC < reset threshold |
| MR | Active-low manual reset input | Asserts RESET on logic-low; includes internal 30kΩ pullup; debounced via 120ns glitch immunity |
| PFI | Power-fail comparator input | Monitors external voltage divider; referenced to 0.6V internal threshold with 30mV hysteresis for noise rejection |
| WDI | Watchdog timer input | Edge-sensitive input; clears internal timer on rising/falling edges; timeout triggers WDO assertion |
| LL | Active-low low-line output | Asserts ~2.5% above reset threshold - provides early NMI warning before reset for orderly shutdown |
| BATT_TEST | Open-drain battery-test pulse output | Pulses low for 1.3s every 24h; used with external load to verify battery health without continuous discharge |
| BATTOK | Battery-OK status indicator | Asserts low when VBATT < 2.508V - signals degraded backup voltage before switchover failure |
| BATTON | Active-high battery-on indicator | Goes high only when device is actively sourcing OUT from BATT - confirms backup mode engagement |
| WDO | Active-low watchdog output | Independent of RESET; asserts on WDI timeout and deasserts on next WDI edge or RESET assertion |
| PFO | Active-low power-fail output | Asserts when PFI input falls below VPFT; deasserts after VPFT + hysteresis - usable as system PFI interrupt |
| GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal and EMI performance |
| RESET | Active-low reset output | Push-pull output; VOL ≤ 0.3V at 1mA sink - directly drives µP reset pin without external pullup |
| OUT | Switched output | Connects to VCC or BATT based on switchover logic; requires ≥0.1µF bypass capacitor to GND |
| CEOUT | Active-low chip-enable output | Gates memory CE; held low for 12µs after reset if CEIN was low - ensures completion of ongoing memory cycle |
| CEIN | Chip-enable input | Passes through to CEOUT during normal operation; disconnected during reset to block spurious writes |
| VCC | Main supply input | Operates from 1.53V to 5.5V; powers internal circuitry and provides bias for push-pull outputs |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | 20nA max leakage at VBATT = 5.5V - preserves shelf life of backup cells during long-term storage |
| On-board CE gating | 1.5ns propagation delay with 8Ω typical on-resistance - eliminates need for external logic or discrete switches |
| Low-line comparator (LL) | Threshold offset 2.5% above reset voltage - enables deterministic NMI-based shutdown before data corruption occurs |
| UL® IEC 60950-1 certification | Validated safety compliance - satisfies regulatory requirements for industrial and commercial end equipment |
| Debounced manual reset | 120ns glitch immunity + internal 30kΩ pullup - eliminates external RC network and reduces BOM count |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining timekeeping and calendar data during AC power loss in smart meters or industrial controllers. IC Role / Device Role / Timing Role: Supervisory controller providing seamless VCC-to-BATT switchover and BATTON confirmation signal. Use Value: Prevents RTC register corruption and eliminates time drift during extended outages using <1µA backup current. |
Use Scenario: Protecting configuration and calibration data stored in battery-backed SRAM during brownout events. IC Role / Device Role / Timing Role: CE gating circuit blocking write cycles when VCC drops below safe margin. Use Value: Eliminates need for external CE logic; 1.5ns propagation delay ensures compatibility with 100MHz+ µPs. |
| GPS Module Power Management | Point-of-Sale (POS) Transaction Integrity |
|
Use Scenario: Preserving satellite almanac and last-known position in handheld GPS units during battery swap or low-voltage shutdown. IC Role / Device Role / Timing Role: Dual-supervision node monitoring both main 3.3V rail and backup coin cell, with LL-triggered save routine. Use Value: LL output initiates NMI-driven data flush before RESET assertion - guarantees atomic state capture. |
Use Scenario: Ensuring transaction logs and fiscal memory integrity during sudden mains failure in retail POS terminals. IC Role / Device Role / Timing Role: Coordinated reset, PFO interrupt, and CE gating preventing partial write to nonvolatile memory. Use Value: Simultaneous RESET assertion and CEOUT disable guarantee no incomplete financial record is committed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTER+ | Same pinout and feature set, but includes BATT_TEST output instead of RESET (active-high); identical reset threshold range and CE gating specs | Preferred where periodic battery health verification is required without adding external test circuitry | Select MAX16020PTER+ when BATT_TEST functionality is needed; MAX16021PTER+ is optimal when active-low RESET is mandatory for µP interface |
| TPS3808G33DBVR | Single-supply supervisor only (no battery switchover or CE gating); 3.3V fixed reset threshold; 350ms timeout; no LL or WDO outputs | Suitable for basic reset-only applications without backup or memory protection requirements | Choose TPS3808G33DBVR only for cost-sensitive designs omitting battery backup, CE control, and early-warning features |
Compared with MAX16021PTER+, MAX16020PTER+ offers identical supervision and gating but swaps RESET polarity for BATT_TEST, while TPS3808G33DBVR lacks battery management and CE logic entirely - making it unsuitable for memory backup or fail-safe write protection.
Availability
MAX16021PTER+ is available at Aetrix Electronics and suitable for industrial control, GPS systems, point-of-sale equipment, and portable/battery-powered devices requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for MAX16021PTER+ 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 MAX16021PTER+ belongs to Maxim's µP supervisory family, engineered specifically for systems requiring coordinated power monitoring, battery-backed memory retention, and hardware-enforced write protection during voltage anomalies.
FAQ
What is the reset threshold voltage for MAX16021PTER+?
The MAX16021PTER+ has a fixed reset threshold range of 2.260V (min) to 2.390V (max), optimized for 2.5V systems. This value is factory-trimmed and guaranteed over -40°C to +85°C with ±1.5% temperature stability. The exact threshold is defined by the 'Z' suffix in the part number and appears in Table 1b of the MAX16021PTER+ datasheet.
Does MAX16021PTER+ support both VCC and battery power sources simultaneously?
Yes - MAX16021PTER+ automatically switches OUT between VCC and BATT based on real-time voltage comparison. When VCC ≥ 1.01 × VBATT and above reset threshold, OUT connects to VCC. When VCC falls below reset threshold and VBATT > VCC, OUT connects to BATT. The BATTON output confirms active battery mode.
How does the CE gating function work in MAX16021PTER+?
In MAX16021PTER+, CEIN passes directly to CEOUT during normal operation. When RESET asserts, CEOUT is immediately disabled: if CEIN was low, CEOUT stays low for 12µs (typ) to complete ongoing memory access; if CEIN was high, CEOUT remains high. This prevents spurious writes during brownout - a key requirement for CMOS SRAM integrity.
What is the purpose of the LL (low-line) output on MAX16021PTER+?
The LL output on MAX16021PTER+ asserts low when VCC falls to ~2.5% above the reset threshold - providing an early warning before RESET activation. It is designed to trigger a nonmaskable interrupt (NMI) in the µP, enabling software-initiated data save and controlled shutdown before power collapse corrupts memory contents.
Can MAX16021PTER+ operate with a 1.8V main supply?
Yes - MAX16021PTER+ operates from 1.53V to 5.5V, fully supporting 1.8V systems. Its reset threshold is fixed at 2.26–2.39V, so it monitors 1.8V rails indirectly via external resistor dividers on PFI or by using its primary VCC supervision only in higher-voltage domains. For direct 1.8V monitoring, select the 'R' or 'Z' variants per Table 1b.
MAX16021PTER+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.64V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 145ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX16021PTER+ FAQ
1.How can I place an order for MAX16021PTER+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTER+ 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 MAX16021PTER+ reliable?
The price and inventory of MAX16021PTER+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTER+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTER+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTER+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTER+?
MAX16021PTER+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTER+ 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 MAX16021PTER+?
For technical support, including MAX16021PTER+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTER+ requirements.
6.How does Aetrix verify that MAX16021PTER+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTER+ 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 MAX16021PTER+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTER+?
All MAX16021PTER+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTER+, 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 MAX16021PTER+ part is unused and in its original packaging.
Return procedure for MAX16021PTER+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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