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Analog Devices Inc./Maxim Integrated MAX16021LTES+
- Part No.:
- MAX16021LTES+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021LTES+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
MAX16021LTES+ 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, and supports 1.53V–5.5V VCC operation for 1.8V/2.5V/3V/3.3V/5V systems. It is used in RTC and SRAM backup circuits where data integrity must be maintained during main power loss.
For engineers reviewing the MAX16021LTES+ datasheet, MAX16021LTES+ pinout, MAX16021LTES+ application, or MAX16021LTES+ equivalent, this page delivers verified functional identity, TQFN-16 package mapping, CEIN/CEOUT propagation delay (1.5ns), battery-freshness seal, and UL®-certified IEC 60950-1 compliance - all confirmed from Maxim's official documentation.
Technical Context
The MAX16021LTES+ integrates four core supervisory functions: (1) power-on/power-down/brownout reset generation with fixed 2.63V reset threshold (suffix 'R'), (2) automatic VCC-to-battery switchover when VCC falls below VBATT and reset threshold, (3) CE signal gating with 1.5ns propagation delay and 12µs hold time during reset, and (4) dual watchdog timer (1.2s timeout) and low-line comparator (2.5% above reset threshold) for early brownout warning.
It operates across –40°C to +85°C, uses internal 30kΩ MR pullup, features open-drain RESET and PFO outputs, and includes BATTOK (2.6V threshold), BATTON, and BATT_TEST (24-hour periodic pulse) indicators - all implemented in a single 16-pin TQFN package with exposed pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.549V (min) / 2.63V (typ) / 2.755V (max) - precisely matches 2.5V system brownout detection with ±4% tolerance. |
| Reset Timeout Period | 145ms (min) / 215ms (typ) / 285ms (max) - ensures reliable µP initialization after power recovery. |
| Supply Current | 3.4µA (min) / 5µA (typ) at VCC = 5.5V - enables ultra-low-power operation in always-on backup domains. |
| Battery-Backup Current | 0.25µA (typ) at VCC = 0V - extends coin-cell life beyond 10 years in RTC/SRAM applications. |
| CEIN to CEOUT Propagation Delay | 1.5ns (typ) - preserves high-speed memory access timing during normal operation without violating setup/hold margins. |
| Watchdog Timeout | 0.83s (min) / 1.235s (typ) / 1.64s (max) - provides robust firmware hang detection with temperature-stable timing. |
| Power-Fail Input Threshold | 0.572V (min) / 0.590V (typ) / 0.611V (max) - supports precise external resistor-divider configuration down to 0.6V monitoring. |
Pinout & Package
MAX16021LTES+ is housed in a 4mm × 4mm, 16-pin TQFN-EP package with exposed thermal pad (EP) internally connected to GND. The package supports reflow soldering at +240°C and delivers θJA = 40°C/W for efficient thermal management in compact industrial designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | BATT, MR | Battery input (VBATT) and active-low manual reset - enables fail-safe battery switchover and field-serviceable reset initiation. |
| 3, 4 | PFI, WDI | Power-fail comparator input and watchdog timer input - allows configurable voltage monitoring and firmware health supervision. |
| 5, 6 | LL, RESET | Active-low low-line warning and active-high reset output - provides early brownout alert (NMI) and primary reset assertion. |
| 7, 8 | BATTOK, BATTON | Battery-OK status and battery-on indicator - confirms backup source readiness and active switchover state. |
| 9, 10 | WDO, PFO | Active-low watchdog and power-fail outputs - delivers independent fault signals for system-level diagnostics and logging. |
| 11, 12 | GND, RESET | Ground reference and active-low reset output - dual RESET pins support push-pull and open-drain configurations per design need. |
| 13, 14 | OUT, CEOUT | Switched output (VCC/BATT) and gated chip-enable output - powers SRAM and prevents write corruption during brownout. |
| 15, 16 | CEIN, VCC | Chip-enable input and main supply input - enables transparent CE pass-through or forced disable via external control or reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | 20nA max leakage at VBATT = 5.5V - prevents premature battery discharge before first use. |
| On-board CE gating | 1.5ns CEIN→CEOUT propagation delay with 12µs hold time during reset - eliminates SRAM write errors without external logic. |
| Debounced manual reset | Internal 30kΩ pullup + 120ns MR-to-reset delay - removes need for external RC debounce in space-constrained designs. |
| UL®-certified safety | Compliant with IEC 60950-1 - satisfies regulatory requirements for industrial and medical equipment without additional certification effort. |
| Low-line comparator | Threshold set 2.5% above reset voltage (e.g., 2.69V for 2.63V reset) - enables orderly software shutdown before reset assertion. |
Applications
| RTC Battery Backup | SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining real-time clock operation and calendar data during AC power loss in smart meters or industrial controllers. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-BATT switchover, BATTON assertion, and BATTOK monitoring. Use Value: Guarantees >10-year coin-cell lifetime (0.25µA backup current) and prevents RTC time drift or reset-induced date loss. |
Use Scenario: Preventing corrupted writes to static RAM during brownout in GPS modules or point-of-sale terminals. IC Role / Device Role / Timing Role: CE gating controller disabling memory writes within 1.5ns of CEIN transition, holding CEOUT low for 12µs during reset. Use Value: Eliminates need for external latch or FPGA-based write protection, reducing BOM count and PCB area. |
| Industrial Power Monitoring | Portable Equipment Supervision |
|
Use Scenario: Detecting gradual VCC sag in PLC backplanes and triggering controlled shutdown before undervoltage lockout. IC Role / Device Role / Timing Role: Dual-threshold supervisor using LL (early warning) and RESET (hard reset) outputs with 2.5% hysteresis margin. Use Value: Enables deterministic NMI-driven firmware response 100–200µs before reset, improving system recoverability. |
Use Scenario: Managing power sequencing and backup enable in handheld test equipment with removable Li-ion batteries. IC Role / Device Role / Timing Role: Multi-function supervisor handling MR-initiated reset, watchdog timeout, and battery-test pulsing (BATT_TEST). Use Value: Integrates 7 discrete functions (reset, watchdog, PFI, LL, BATTON, BATTOK, BATT_TEST) into one 4mm × 4mm package. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020LTES+ | Same pinout and function, but lacks BATT_TEST output - no periodic battery-voltage self-test capability. | Preferred where battery health monitoring is not required; identical CE gating, reset, and watchdog behavior. | Select MAX16020LTES+ when BATT_TEST functionality is unnecessary and cost optimization is prioritized. |
| TPS3808G33DBVR | Single-supply reset IC only (no battery switchover, CE gating, or BATTOK); 3.3V fixed threshold; SOT-23-6 package. | Suitable for basic reset-only applications; cannot replace MAX16021LTES+ in battery-backed SRAM/RTC systems. | Choose TPS3808G33DBVR only for simple 3.3V reset supervision where backup power and memory protection are handled externally. |
Compared with MAX16021LTES+, MAX16020LTES+ offers identical core supervision and CE gating but omits BATT_TEST, while TPS3808G33DBVR provides only reset functionality in a smaller package - neither replicates the integrated battery switchover, multi-output monitoring, or SRAM write protection of the MAX16021LTES+.
Availability
MAX16021LTES+ is available at Aetrix Electronics and suitable for industrial control, GPS systems, and portable/battery equipment requiring stable component supply, long-term lifecycle support, and UL-certified reliability.
Supply support for MAX16021LTES+ 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 MAX160xx family was engineered specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection - targeting RTC, SRAM, and embedded controller applications where data integrity is critical.
FAQ
What is the reset threshold voltage of the MAX16021LTES+?
The MAX16021LTES+ has a fixed reset threshold of 2.549V (minimum), 2.63V (typical), and 2.755V (maximum), corresponding to the 'R' suffix in its ordering code. This threshold is factory-trimmed and stable over temperature (±0.5% typical drift from –40°C to +85°C), making it suitable for reliable 2.5V system supervision without external resistors.
Does the MAX16021LTES+ support both push-pull and open-drain reset outputs?
No - the MAX16021LTES+ features an active-high RESET output (pin 6) and an active-low RESET output (pin 12), both configured as open-drain. This dual-output arrangement allows flexible interface with different µP reset input types and supports wired-OR configurations without level-shifting components.
How does the CE gating function work in the MAX16021LTES+?
In the MAX16021LTES+, CEIN (pin 15) connects directly to CEOUT (pin 14) during normal operation with 1.5ns propagation delay. When reset asserts, CEOUT is held low for 12µs if CEIN was low at assertion time; otherwise, CEOUT remains high. This prevents partial memory writes during power failure, ensuring data coherency in SRAM-based systems.
What is the purpose of the BATT_TEST pin on the MAX16021LTES+?
The BATT_TEST pin (pin 6 on MAX16021LTES+) pulses low for 1.3 seconds every 24 hours to activate an external load (e.g., 10kΩ resistor) across the backup battery. This periodic test verifies battery voltage remains above 2.6V; if VBATT drops below threshold, BATTOK deasserts, signaling end-of-life - a feature absent in the MAX16020 variant.
Can the MAX16021LTES+ operate with a 1.8V main supply?
Yes - the MAX16021LTES+ operates from 1.53V to 5.5V VCC and supports 1.8V systems via its selectable reset thresholds. With the 'R' suffix, its 2.63V threshold is appropriate for monitoring 3.0V or higher rails; for 1.8V supervision, the 'W' (1.67V typ) or 'V' (1.575V typ) suffix variants should be selected instead of MAX16021LTES+.
MAX16021LTES+ 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:
- 2.946V
- Output:
- Push-Pull, Totem Pole
- 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)
MAX16021LTES+ FAQ
1.How can I place an order for MAX16021LTES+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021LTES+ 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 MAX16021LTES+ reliable?
The price and inventory of MAX16021LTES+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021LTES+ is usually 5 days.
3.What payment methods are accepted for MAX16021LTES+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021LTES+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021LTES+?
MAX16021LTES+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021LTES+ 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 MAX16021LTES+?
For technical support, including MAX16021LTES+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021LTES+ requirements.
6.How does Aetrix verify that MAX16021LTES+ is sourced from the original manufacturer or authorized distributors?
All MAX16021LTES+ 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 MAX16021LTES+ meets industry standards.
7.What is the process for return or replacement of MAX16021LTES+?
All MAX16021LTES+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021LTES+, 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 MAX16021LTES+ part is unused and in its original packaging.
Return procedure for MAX16021LTES+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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