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Analog Devices Inc./Maxim Integrated MAX16021PTES+
- Part No.:
- MAX16021PTES+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTES+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:898
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Product details
Overview
MAX16021PTES+ 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, and supports 1.53V–5.5V operation for 5V/3.3V/3V/2.5V/1.8V systems. Used in RTC and SRAM backup circuits where data retention during main power loss is critical.
For engineers reviewing the MAX16021PTES+ datasheet, MAX16021PTES+ pinout, MAX16021PTES+ application, or MAX16021PTES+ equivalent, key selection criteria include its 16-pin TQFN package, open-drain reset output, 2.549V–2.755V reset threshold range (suffix 'R'), CEIN/CEOUT propagation delay of 1.5ns, and battery-OK/battery-on indicators for system-level power state awareness.
Technical Context
The MAX16021PTES+ integrates four core supervisory functions: µP reset generation during VCC brownout/power-up/power-down; automatic VCC-to-battery switchover when VCC falls below both reset threshold and VBATT; internal CE gating to prevent memory corruption during brownout; and power-fail detection with 0.590V PFI threshold and 30mV hysteresis.
It implements a dual-path power switch (VCC↔OUT and BATT↔OUT) controlled by internal comparators and latches, with CE gating logic that holds CEOUT low for 12µs after reset assertion if CEIN is low-ensuring completion of ongoing memory access before write protection engages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.549V (min) to 2.755V (max); fixed threshold for 2.63V nominal 3V-system monitoring |
| Reset Timeout Period | 145ms (min); ensures reliable µP initialization after power recovery |
| Supply Current | 3.4µA (typ) at VCC = 5.5V; enables ultra-low-power operation in always-on systems |
| Battery-Backup Current | 0.25µA (typ) at VCC = 0V; minimizes battery drain during extended backup mode |
| CEIN to CEOUT Delay | 1.5ns (typ); supports high-speed µP/DSP interfaces without timing violation |
| PFI Threshold | 0.590V (typ); allows precise low-voltage monitoring down to 0.6V with 30mV hysteresis |
| Operating Temp Range | -40°C to +85°C; qualified for industrial and embedded environments |
Pinout & Package
MAX16021PTES+ 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 under continuous load.
| 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 30kΩ internal pullup to VCC; debounced internally |
| PFI | Power-fail comparator input | Monitors scaled VCC via external resistor divider; referenced to 0.590V internal threshold |
| WDI | Watchdog timer input | Clears watchdog on rising/falling edge; timeout = 1.235s (typ); disabled if left floating |
| LL | Active-low low-line output | Asserts 2.5% above reset threshold to provide early warning NMI before reset triggers |
| BATT_TEST | Open-drain battery-test output | Pulses low for 1.3s every 24h to verify battery health; triggers BATTOK deassertion if VBATT < 2.6V |
| BATTOK | Battery-OK status indicator | Asserts low when battery voltage falls below 2.6V threshold; used for system-level battery health reporting |
| BATTON | Active-high battery-on indicator | Goes high only during active battery-backup mode; signals transition to backup power path |
| WDO | Active-low watchdog output | Asserts independently of RESET; resets on next WDI edge or system reset |
| PFO | Active-low power-fail output | Asserts when PFI input falls below 0.590V; provides dedicated power-fail interrupt signal |
| GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal management |
| RESET | Active-low reset output | Open-drain output; requires external pullup; asserts on VCC brownout, MR low, or watchdog timeout |
| OUT | Switched output | Delivers regulated VCC or BATT to load (e.g., SRAM); bypass with ≥0.1µF capacitor to GND |
| CEOUT | Active-low chip-enable output | Gates memory CE line; held low for 12µs after reset if CEIN was low, preventing write corruption |
| CEIN | Chip-enable input | Passes through to CEOUT during normal operation; disconnected during reset assertion |
| VCC | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry and drives push-pull outputs; bypass with 0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| On-board CE gating with 1.5ns propagation delay | Prevents memory write corruption during brownout by disabling CE path within nanoseconds of reset assertion |
| Battery freshness seal | Reduces BATT standby leakage to ±10nA, preserving shelf life of backup cells |
| Integrated low-line comparator (LL) | Provides 2.5% early-warning threshold relative to reset point, enabling orderly software shutdown before reset |
| Dual-mode reset output (open-drain) | Supports flexible interface with µP I/O banks requiring pullup or wired-OR configurations |
| UL®-certified per IEC 60950-1 | Validated for safety compliance in end-equipment without additional system-level certification effort |
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 signaling to enable RTC sleep mode. Use Value: Ensures zero time drift and eliminates RTC reinitialization; leverages 0.25µA battery-backup current to extend coin-cell life beyond 10 years. | Use Scenario: Preventing data corruption in set-top box firmware storage during AC power interruption. IC Role / Device Role / Timing Role: CE gating controller that disables memory write access within 1.5ns of brownout detection. Use Value: Eliminates need for external logic or FPGA-based write-protection schemes; guarantees data integrity without software intervention. |
| Industrial PLC Power Monitoring | Point-of-Sale (POS) Transaction Integrity |
Use Scenario: Detecting undervoltage conditions in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Multi-threshold supervisor delivering simultaneous PFO, LL, and RESET signals for layered fault response. Use Value: Enables three-tiered action: LL triggers NMI for graceful I/O freeze, PFO initiates backup logging, RESET forces full restart-all from single IC. | Use Scenario: Securing credit card transaction buffers in retail terminals during momentary grid sags. IC Role / Device Role / Timing Role: Battery-backed reset and CE gate ensuring SRAM retains uncommitted transaction data until power recovers. Use Value: Guarantees ACID-compliant transaction persistence; BATTOK monitoring prevents use of degraded backup cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTES+ | Same pinout, identical CE gating and battery features, but includes BATT_TEST output instead of RESET (active-high) - MAX16021PTES+ has active-low RESET and no BATT_TEST | MAX16020PTES+ supports periodic battery self-test; MAX16021PTES+ prioritizes deterministic reset polarity for legacy µP compatibility | Select MAX16021PTES+ when active-low RESET is required and BATT_TEST functionality is unnecessary |
| TPS3808G33DBVR | Single-supply supervisor only (no battery switchover, no CE gating, no BATTOK/BATTON); 3.3V fixed reset threshold; SOT-23-6 package | Lacks battery backup, memory protection, and multi-output supervision; suitable only for basic reset-only applications | Choose MAX16021PTES+ when system requires integrated battery switchover, CE gating, and dual-status indicators |
Compared with MAX16020PTES+, MAX16021PTES+ trades BATT_TEST capability for guaranteed active-low RESET polarity-critical for µPs with dedicated active-low reset pins-while retaining identical CE gating performance and battery management. Against TPS3808G33DBVR, it delivers five additional supervisory functions in one 16-pin TQFN, eliminating board space and BOM count for discrete backup and protection circuitry.
Availability
MAX16021PTES+ is available at Aetrix Electronics and suitable for industrial control, GPS systems, set-top boxes, and point-of-sale equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16021PTES+ 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 industrial, automotive, and communications applications.
The MAX160xx family targets µP-based systems needing integrated power supervision, battery backup, and memory protection-designed to replace discrete reset + battery switch + watchdog solutions with a single compact IC.
FAQ
What is the reset threshold voltage range for MAX16021PTES+?
The MAX16021PTES+ has a fixed reset threshold range of 2.549V (min) to 2.755V (max), with a typical value of 2.63V. This corresponds to the 'R' suffix in the ordering code and is optimized for monitoring 3V nominal power rails. The threshold is temperature-stable, varying less than ±0.5% over -40°C to +85°C.
Does MAX16021PTES+ support both VCC and battery power sources simultaneously?
Yes, MAX16021PTES+ dynamically switches the OUT pin between VCC and BATT based on real-time voltage comparison. When VCC is above the reset threshold and greater than VBATT, OUT connects to VCC. When VCC falls below the reset threshold and VBATT exceeds VCC, OUT automatically connects to BATT-enabling uninterrupted power to attached SRAM or RTC without external MOSFETs or diodes.
How does the CE gating function protect memory in MAX16021PTES+?
The MAX16021PTES+ CE gating disconnects CEIN from CEOUT during reset assertion. If CEIN is low when reset triggers, CEOUT remains low for 12µs to complete the current memory access, then goes high and stays high regardless of CEIN transitions-preventing spurious writes. Propagation delay is 1.5ns (typ), ensuring compatibility with high-speed µPs and DSPs.
What is the purpose of the BATT_TEST output on MAX16021PTES+?
The MAX16021PTES+ does not include the BATT_TEST output. That feature is present only on MAX16020PTES+. MAX16021PTES+ substitutes an active-low RESET output in its place. BATT_TEST is a pulsed open-drain signal that activates every 24 hours to test battery health; its absence in MAX16021PTES+ simplifies design when periodic battery self-test is not required.
Can MAX16021PTES+ operate with a 1.8V main supply?
Yes, MAX16021PTES+ operates across 1.53V to 5.5V, fully supporting 1.8V systems. Its reset threshold is fixed at ~2.63V, so for 1.8V rails, it monitors a higher-voltage auxiliary supply (e.g., 3.3V or 5V) or uses external resistive scaling on the PFI input to detect 1.8V brownout indirectly. Internal circuitry remains functional at 1.8V VCC, drawing only 3.4µA typical supply current.
MAX16021PTES+ 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:
- 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)
MAX16021PTES+ FAQ
1.How can I place an order for MAX16021PTES+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTES+ 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 MAX16021PTES+ reliable?
The price and inventory of MAX16021PTES+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTES+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTES+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTES+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTES+?
MAX16021PTES+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTES+ 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 MAX16021PTES+?
For technical support, including MAX16021PTES+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTES+ requirements.
6.How does Aetrix verify that MAX16021PTES+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTES+ 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 MAX16021PTES+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTES+?
All MAX16021PTES+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTES+, 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 MAX16021PTES+ part is unused and in its original packaging.
Return procedure for MAX16021PTES+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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