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Analog Devices Inc./Maxim Integrated MAX16021PTEV+
- Part No.:
- MAX16021PTEV+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEV+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,159
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Product details
Overview
MAX16021PTEV+ 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 systems (reset threshold 1.528V–1.618V), delivers 145ms reset timeout, supports 1.53V–5.5V operation, and provides active-low CEOUT with 1.5ns propagation delay for SRAM write protection in brownout conditions.
For engineers reviewing the MAX16021PTEV+ datasheet, MAX16021PTEV+ pinout, MAX16021PTEV+ application, or MAX16021PTEV+ equivalent, this page details its verified reset behavior, battery-OK/BATTON signaling, CEIN/CEOUT timing, low-line warning (LL), and watchdog timer (1.2s timeout) - all confirmed for the MAX16021 variant in 16-pin TQFN package.
Technical Context
The MAX16021PTEV+ implements a dual-path power-switching architecture: VCC connects to OUT during normal operation; when VCC falls below reset threshold and VBATT > VCC, it switches OUT to BATT with sub-100nA standby leakage. Its CE gating uses a transmission gate with 8Ω–50Ω on-resistance and 12µs hold time after reset assertion to complete memory access.
It integrates five independent supervisory functions: reset generation (145–285ms timeout), watchdog timer (0.83–1.64s), power-fail comparator (0.572–0.611V threshold), low-line indicator (2.5% above reset threshold), and battery status logic (BATTOK at 2.508–2.673V, BATTON high in backup mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.528V–1.618V (V suffix); enables reliable reset detection for 1.8V logic rails with ±1.5% accuracy over -40°C to +85°C |
| Reset Timeout Period | 145ms (min); ensures µP reset pulse meets minimum duration requirements for ARM/Cortex and legacy 8-bit processors |
| Supply Current | 3.4–5µA at VCC = 5.5V; ultra-low active power enables use in always-on industrial sensors and GPS trackers |
| Battery-Backup Current | 0.25–0.5µA at VCC = 0V; preserves multi-year RTC/SRAM backup life from coin-cell batteries |
| CEIN-to-CEOUT Propagation Delay | 1.5–7ns (50Ω source, 50pF load); supports high-speed µP/DSP interfaces up to 200MHz without CE skew |
| Watchdog Timeout | 0.83–1.64s (typ 1.235s); provides robust software hang detection with temperature-stable timing across full operating range |
| Power-Fail Input Threshold | 0.572–0.611V with 30mV hysteresis; allows precise external resistor-divider setup for early VCC failure warning down to 0.6V |
Pinout & Package
MAX16021PTEV+ is housed in a 16-pin 4mm × 4mm TQFN-EP package with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables stable operation at 70°C ambient with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Accepts 0–5.5V; enables automatic switchover to battery when VCC < reset threshold and VBATT > VCC |
| MR | Active-low manual reset input | Internally pulled up to VCC (30kΩ); asserts reset on logic-low; 120ns delay to RESET output |
| PFI | Power-fail comparator input | Monitors external divider; referenced to 0.590V internal threshold with 30mV hysteresis for noise immunity |
| WDI | Watchdog timer input | Edge-triggered; clears watchdog on rising/falling edge; timeout occurs if static for >1.2s |
| LL | Active-low low-line output | Asserts 2.5% above reset threshold; provides early NMI for orderly shutdown before reset triggers |
| BATT_TEST | Open-drain battery-test pulse | Pulses low for 1.3s every 24h; used with external load to verify battery health without continuous drain |
| RESET | Active-low reset output | Push-pull drive; VOL ≤ 0.3V at 1mA sink; deasserts only after VCC > threshold + 145ms timeout |
| BATTOK | Battery-OK status output | Asserts high when VBATT ≥ 2.6V; goes low if battery drops below 2.508V, indicating replacement needed |
| BATTON | Active-high battery-on indicator | Goes high only during valid battery-backup mode (VCC < threshold AND VBATT > VCC); confirms switchover |
| WDO | Active-low watchdog output | Independent of RESET; asserts on WDI timeout; cleared by next WDI edge or RESET assertion |
| PFO | Active-low power-fail output | Asserts when PFI falls below 0.590V; used to disable peripherals or trigger backup save routines |
| GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal and EMI performance |
| OUT | Switched output | Delivers VCC or BATT to load; RON ≤ 5.5Ω at 1.91V; bypass with ≥0.1µF capacitor to GND |
| CEOUT | Active-low chip-enable output | Gates CE to SRAM; held low for 12µs after reset assertion to complete pending memory cycle |
| CEIN | Chip-enable input | Passes through to CEOUT unless reset asserted; 1µA max leakage ensures clean signal integrity |
| VCC | Main supply input | Operates from 1.53–5.5V; bypass with 0.1µF ceramic capacitor; powers internal circuitry and CE pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | 20nA max leakage at VBATT = 5.5V prevents premature battery discharge during long-term storage |
| Debounced manual reset | No external RC required; internal 30kΩ pullup and 100ns glitch immunity enable direct switch connection to MR |
| On-board CE gating | 1.5ns propagation delay and 12µs post-reset hold time prevent SRAM corruption during brownout recovery |
| UL®-certified safety | Complies with IEC 60950-1; qualified for use in industrial control and medical auxiliary power systems |
| Low-line early-warning output | LL asserts 2.5% above reset threshold (e.g., 1.563V for V suffix) to initiate firmware shutdown before reset occurs |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
Use Scenario: Maintaining timekeeping and calendar data in GPS modules during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-BATT switchover and BATTON confirmation signal. Use Value: Enables >10-year RTC operation from CR2032 battery with 0.25µA backup current and automatic switchover at 1.57V threshold. |
Use Scenario: Preventing data corruption in point-of-sale terminals during AC power interruption. IC Role / Device Role / Timing Role: CE gating controller asserting CEOUT low during brownout to block write cycles to SRAM. Use Value: 1.5ns CEIN→CEOUT delay and 12µs hold time ensure no partial writes occur, preserving transaction integrity. |
| Industrial PLC Power Monitoring | Portable Medical Device Power Management |
Use Scenario: Detecting undervoltage events in programmable logic controllers to trigger safe I/O shutdown. IC Role / Device Role / Timing Role: Dual-threshold supervisor generating LL (early warning) and RESET (hard reset) outputs. Use Value: LL output provides 20µs response to VCC droop, enabling firmware to disable actuators before reset asserts. |
Use Scenario: Managing power sequencing and battery health in handheld ultrasound scanners. IC Role / Device Role / Timing Role: Battery-status monitor with BATTOK, BATTON, and periodic BATT_TEST pulses. Use Value: BATT_TEST pulses every 24h verify battery voltage ≥2.6V without draining capacity, extending field service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEV+ | Identical pinout and electrical specs; differs only in RESET polarity (active-high on MAX16020 vs. active-low on MAX16021) | Requires µP reset input compatible with active-high assertion; not drop-in for active-low reset designs | Select MAX16020PTEV+ only when host processor accepts active-high reset signals and layout accommodates same footprint. |
| TPS3808G15DBVR | Single-supply reset IC (no battery switchover, no CE gating, no BATTOK/BATTON); 1.5V threshold, 200ms timeout | Lacks battery management and memory protection features; suitable only for basic reset-only applications | Choose TPS3808G15DBVR only when battery backup and SRAM write protection are unnecessary and cost is primary constraint. |
Compared with MAX16021PTEV+, MAX16020PTEV+ offers identical supervision and battery switching but requires active-high reset compatibility, while TPS3808G15DBVR omits battery interface and CE gating entirely - making MAX16021PTEV+ the sole choice for systems requiring coordinated backup power and memory write lockout.
Availability
MAX16021PTEV+ 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 and long-term lifecycle support.
Supply support for MAX16021PTEV+ 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 and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on reliability and integration.
The MAX160xx family targets µP-based systems needing consolidated power supervision, battery backup, and memory protection - specifically engineered for RTC, SRAM, and industrial control applications where power resilience is critical.
FAQ
What is the reset threshold voltage range for MAX16021PTEV+?
The MAX16021PTEV+ has a reset threshold range of 1.528V (min) to 1.618V (max) per Table 1b (V suffix), with typical value 1.571V. This is factory-trimmed and guaranteed over -40°C to +85°C, enabling precise supervision of 1.8V supply rails without external resistors.
Does MAX16021PTEV+ support both VCC and battery power sources simultaneously?
Yes - MAX16021PTEV+ automatically switches OUT between VCC and BATT based on real-time comparison: OUT connects to VCC when VCC > 1.01 × VBATT or reset is deasserted; it connects to BATT only when VCC falls below reset threshold AND VBATT > VCC, ensuring seamless backup without manual intervention.
How does the CE gating function protect SRAM during power failure?
During normal operation, CEIN passes directly to CEOUT. When RESET asserts, MAX16021PTEV+ holds CEOUT low for 12µs (typ) to complete any ongoing memory access, then pulls CEOUT high to block further writes - preventing partial writes and data corruption in CMOS SRAM during brownout recovery.
What is the purpose of the BATT_TEST pin on MAX16021PTEV+?
The BATT_TEST pin on MAX16021PTEV+ pulses low for 1.3 seconds every 24 hours to activate an external test load, verifying battery voltage remains ≥2.6V. If VBATT drops below 2.508V, BATTOK deasserts - enabling predictive battery replacement without continuous current draw.
Can MAX16021PTEV+ be used with a 3.3V main supply?
Yes - MAX16021PTEV+ operates from 1.53V to 5.5V and supports fixed reset thresholds for 3.3V systems (S suffix: 2.845–3.080V). Its 3.4–5µA supply current and 0.25µA battery-backup current make it ideal for 3.3V industrial and portable applications requiring low quiescent power.
MAX16021PTEV+ 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:
- 1.571V
- 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)
MAX16021PTEV+ FAQ
1.How can I place an order for MAX16021PTEV+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEV+ 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 MAX16021PTEV+ reliable?
The price and inventory of MAX16021PTEV+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEV+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTEV+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEV+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEV+?
MAX16021PTEV+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEV+ 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 MAX16021PTEV+?
For technical support, including MAX16021PTEV+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEV+ requirements.
6.How does Aetrix verify that MAX16021PTEV+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEV+ 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 MAX16021PTEV+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTEV+?
All MAX16021PTEV+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEV+, 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 MAX16021PTEV+ part is unused and in its original packaging.
Return procedure for MAX16021PTEV+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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