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Analog Devices Inc./Maxim Integrated MAX16021PTEV+T
- Part No.:
- MAX16021PTEV+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEV+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,663
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Product details
Overview
MAX16021PTEV+T 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 timeout, 1.2µA supply current, and supports 1.8V/2.5V/3V/3.3V/5V systems. Used in RTC and SRAM backup circuits where data retention during main power loss is critical.
For engineers reviewing the MAX16021PTEV+T datasheet, MAX16021PTEV+T pinout, MAX16021PTEV+T application, or MAX16021PTEV+T equivalent, key selection criteria include reset threshold accuracy (1.571V typ), CEIN-to-CEOUT propagation delay (1.5ns), battery-OK indicator threshold (2.6V), and TQFN-16 package compatibility with high-density PCB layouts.
Technical Context
The MAX16021PTEV+T integrates four core supervisory functions: µP reset generation during VCC brownout/power-down, automatic VCC-to-battery switchover for memory backup, internal CE signal gating to prevent write corruption, and power-fail detection via PFI/PFO with 0.590V threshold and 30mV hysteresis.
It features dual reset outputs (active-low RESET and active-high RESET), watchdog timer (1.235s typ timeout), low-line comparator (LL) asserting 2.5% above reset threshold, and battery-test functionality with 24-hour periodic BATT_TEST pulse. All functions operate across -40°C to +85°C with 1.53V–5.5V VCC range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.571V (typical); precisely monitors 1.8V systems with ±3% tolerance over temperature. |
| Supply Current | 5µA (max at VCC = 5.5V); enables ultra-low-power operation in always-on backup circuits. |
| Battery-Backup Mode Current | 0.5µA (max); minimizes battery drain during extended VCC outage, extending shelf life. |
| Reset Timeout Period | 145–285ms; ensures reliable µP initialization after power recovery without premature release. |
| CEIN-to-CEOUT Propagation Delay | 1.5ns (typ); supports high-speed memory interfaces up to 500MHz without timing violation. |
| Power-Fail Comparator Threshold | 0.590V ±19mV; allows precise low-voltage monitoring down to 0.6V with noise immunity. |
| Operating Temperature Range | -40°C to +85°C; qualified for industrial and automotive-adjacent embedded applications. |
Pinout & Package
MAX16021PTEV+T is housed in a 16-pin TQFN-EP (3mm × 3mm) package with exposed pad connected to GND for thermal management. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Connects to lithium or coin-cell battery; enables automatic switchover when VCC falls below reset threshold and VBATT > VCC. |
| MR | Active-low manual reset input | Asserts reset on logic-low transition; includes 30kΩ internal pullup-no external resistor needed. |
| PFI | Power-fail comparator input | Accepts resistive divider for custom low-voltage detection; referenced to 0.590V internal threshold. |
| WDI | Watchdog timer input | Edge-triggered; resets watchdog on rising/falling edge; left floating to disable function. |
| LL | Active-low low-line output | Asserts 2.5% above reset threshold to provide early warning NMI before reset occurs. |
| BATT_TEST | Open-drain battery-test output | Pulses low for 1.3s every 24 hours to verify battery health; triggers BATTOK deassertion if VBATT < 2.6V. |
| BATTOK | Battery-OK status output | Indicates valid backup voltage (2.508–2.673V range); goes low when battery is depleted. |
| BATTON | Active-high battery-on indicator | Signals active battery-backup mode; used to enable auxiliary circuits only during backup. |
| WDO | Active-low watchdog output | Asserts independently of RESET; allows separate system-level watchdog handling. |
| PFO | Active-low power-fail output | Complements PFI input; asserts when monitored voltage falls below threshold. |
| GND | Ground reference | Primary return path; EP pad must be soldered to large ground plane for thermal performance. |
| RESET | Active-low reset output | Drives µP reset pin; remains asserted for full timeout period after VCC recovery or MR release. |
| OUT | Switched output | Delivers VCC or BATT to load (e.g., SRAM VDD); automatically selects source based on voltage conditions. |
| CEOUT | Active-low chip-enable output | Gates memory CE line; held low during reset to block writes; pulled up to OUT when inactive. |
| CEIN | Chip-enable input | Passes through to CEOUT during normal operation; isolated during reset to enforce write protection. |
| VCC | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry and drives push-pull outputs (RESET, BATTON, etc.). |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | Reduces initial battery leakage to ≤20nA, preserving shelf life before first use. |
| On-board CE gating with 1.5ns delay | Prevents memory corruption during brownout by blocking CE transitions within nanosecond timing budget. |
| Debounced manual reset input | Eliminates need for external RC filter; internal 120ns MR-to-RESET delay rejects sub-100ns noise spikes. |
| UL®-certified per IEC 60950-1 | Validated for safety compliance in end equipment without additional system-level certification effort. |
| Low-line comparator (LL) | Provides deterministic early-warning interrupt 2.5% above reset threshold-enables graceful software shutdown. |
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 controller that switches RTC power source from VCC to backup battery and asserts BATTON to enable oscillator bias. Use Value: Guarantees uninterrupted RTC operation for >10 years on CR2032 battery due to 0.5µA backup current and freshness seal. |
Use Scenario: Preventing data corruption in point-of-sale terminals during AC power interruption. IC Role / Device Role / Timing Role: CE gate enforcer that disables SRAM write access within 1.5ns of brownout detection. Use Value: Eliminates need for external latch or FPGA-based write-protection logic, reducing BOM count and layout area. |
| Industrial PLC Memory Retention | Portable Medical Device Power Management |
|
Use Scenario: Preserving configuration registers and event logs in programmable logic controllers during factory line power dips. IC Role / Device Role / Timing Role: Dual-function supervisor providing both reset assertion and LL-triggered NMI for firmware-controlled save-and-halt sequence. Use Value: Enables deterministic 20ms window between LL assert and RESET for safe register dump before power loss. |
Use Scenario: Extending battery runtime in handheld ECG monitors by minimizing quiescent current during standby. IC Role / Device Role / Timing Role: Ultra-low-power supervisor (1.2µA ICC) with battery-test scheduling to validate charge before clinical use. Use Value: Reduces average system standby current by 40% versus discrete reset + battery monitor solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEV+T | Identical pinout and feature set but lacks BATT_TEST output; uses active-high RESET instead of active-low RESET on Pin 6. | Suitable for designs not requiring periodic battery health verification; simpler watchdog integration where dual-reset polarity is unnecessary. | Select MAX16020PTEV+T when BATT_TEST functionality is unused and active-high reset simplifies µP interface logic. |
| TPS3808G18DBVR | Single-supply reset IC with 1.8V threshold; no battery switchover, CE gating, or BATTOK/BATTON outputs. | Limited to basic reset supervision; cannot replace MAX16021PTEV+T in battery-backed memory applications. | Choose TPS3808G18DBVR only for cost-sensitive, non-backup applications where CE control and battery status are handled externally. |
Compared with MAX16020PTEV+T, MAX16021PTEV+T adds scheduled battery testing and dual-reset polarity flexibility; versus TPS3808G18DBVR, it delivers full system-level power management-making it irreplaceable in SRAM/RTC backup architectures.
Availability
MAX16021PTEV+T is available at Aetrix Electronics and suitable for industrial control, GPS systems, point-of-sale equipment, and portable medical devices requiring stable component supply and long-term lifecycle support.
Supply support for MAX16021PTEV+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) is a semiconductor company specializing in analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The MAX160xx family was designed specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection-targeting high-reliability embedded applications with constrained board space.
FAQ
What is the exact reset threshold voltage for MAX16021PTEV+T?
The MAX16021PTEV+T has a nominal reset threshold of 1.571V (typical), with guaranteed range of 1.528V to 1.618V across temperature and process variation. This value is fixed by internal trimming and applies to all units bearing the 'V' suffix per Table 1b in the datasheet. The threshold exhibits ±0.5% drift over -40°C to +85°C, ensuring stable 1.8V system monitoring without external calibration.
Does MAX16021PTEV+T support both VCC and battery power sources simultaneously?
Yes, MAX16021PTEV+T dynamically manages dual power sources: it connects OUT to VCC during normal operation and automatically switches OUT to BATT when VCC falls below the reset threshold and VBATT exceeds VCC. The internal MOSFET switchover path has ≤5.5Ω on-resistance at 1.91V, enabling efficient power delivery to SRAM or RTC without external diodes or controllers.
How does the CE gating function protect memory in MAX16021PTEV+T?
The MAX16021PTEV+T prevents memory corruption by disconnecting CEIN from CEOUT during reset assertion. If CEIN is low when reset activates, CEOUT stays low for 12µs to complete ongoing memory access; then it pulls high to disable further writes. This hardware-enforced gating eliminates race conditions that could occur with software-only write protection during brownout events.
What is the purpose of the BATT_TEST output on MAX16021PTEV+T?
The BATT_TEST output on MAX16021PTEV+T 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 verifies battery health: if VBATT drops below 2.6V during test, BATTOK deasserts to signal depletion. This autonomous self-test eliminates need for host µP intervention or external test circuitry.
Can MAX16021PTEV+T operate with a 1.53V supply voltage?
Yes, MAX16021PTEV+T is fully specified to operate from 1.53V to 5.5V on VCC. At 1.53V, it maintains functional reset generation, CE gating, and battery switchover-verified across -40°C to +85°C. Supply current remains ≤5µA, and reset timeout holds at minimum 145ms, making it suitable for ultra-low-voltage energy-harvesting or single-cell LiFePO₄ systems.
MAX16021PTEV+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX16021PTEV+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEV+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 MAX16021PTEV+T reliable?
The price and inventory of MAX16021PTEV+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEV+T is usually 5 days.
3.What payment methods are accepted for MAX16021PTEV+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEV+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEV+T?
MAX16021PTEV+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEV+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 MAX16021PTEV+T?
For technical support, including MAX16021PTEV+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEV+T requirements.
6.How does Aetrix verify that MAX16021PTEV+T is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEV+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 MAX16021PTEV+T meets industry standards.
7.What is the process for return or replacement of MAX16021PTEV+T?
All MAX16021PTEV+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEV+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 MAX16021PTEV+T part is unused and in its original packaging.
Return procedure for MAX16021PTEV+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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