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Analog Devices Inc./Maxim Integrated MAX16020PTET+
- Part No.:
- MAX16020PTET+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020PTET+.pdf
- Description:
- IC UP SUPERVISOR LP 16-TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
MAX16020PTET+ 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 3.3V systems (typical reset threshold 3.100V), provides 145ms min reset timeout, delivers 1.5ns CEIN-to-CEOUT propagation delay, and operates from 1.53V to 5.5V supply - used for write protection of SRAM during brownout in GPS and portable equipment.
For engineers reviewing the MAX16020PTET+ datasheet, MAX16020PTET+ pinout, MAX16020PTET+ application, or MAX16020PTET+ equivalent, key selection criteria include its open-drain reset output, 16-pin TQFN package, battery-freshness seal, watchdog timer (1.2s typ), and CE gating with sub-2ns propagation - all critical for reliable memory backup in industrial and battery-powered systems.
Technical Context
The MAX16020PTET+ integrates four core functions: µP reset generation during VCC power-up/down/brownout; automatic VCC-to-battery switchover when VCC falls below reset threshold and VBATT > VCC; internal CE signal gating to prevent erroneous writes during power failure; and power-fail comparator with 0.590V threshold and 30mV hysteresis.
It features a dedicated BATTOK indicator (2.6V threshold), BATTON output signaling battery-backup mode, and a debounced manual reset input with 30kΩ internal pullup. The device uses an internal MOSFET for switchover, with VCC-to-OUT on-resistance as low as 1.7Ω at 3.15V/65mA and battery standby current ≤±10nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.100V (typ), fixed for 3.3V systems - ensures deterministic reset assertion before logic corruption |
| Reset Timeout Period | 145ms (min) - guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables ultra-low-power operation in always-on backup circuits |
| Battery-Backup Current | 0.25µA (max) at VCC = 0V - preserves battery life for multi-year RTC/SRAM retention |
| CE Propagation Delay | 1.5ns (typ) - supports high-speed µP/DSP interfaces without timing violation |
| Power-Fail Threshold | 0.590V ±19mV - allows precise low-voltage monitoring down to 0.6V via external resistor divider |
| Operating Temp Range | -40°C to +85°C - qualified for industrial and automotive-adjacent environments |
Pinout & Package
MAX16020PTET+ is housed in a 16-pin 4mm × 4mm TQFN-EP package with exposed pad (EP) connected internally to GND. Thermal resistance θJA = 40°C/W enables stable operation under continuous load without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BATT | Backup battery input | Connects to 2.2–5.5V backup source; enables automatic switchover when VCC < VTH and VBATT > VCC |
| 2 MR | Active-low manual reset input | Asserts reset on logic-low; includes 30kΩ internal pullup - eliminates need for external resistor |
| 3 PFI | Power-fail comparator input | Accepts resistive divider output; referenced to 0.590V internal threshold with 30mV hysteresis |
| 4 WDI | Watchdog timer input | Edge-triggered; resets watchdog on rising/falling edge; timeout = 1.2s (typ) |
| 5 LL | Active-low low-line output | Asserts 2.5% above reset threshold - provides early warning NMI for orderly shutdown |
| 6 RESET | Active-high reset output | Open-drain; requires external pullup; asserts when VCC < VTH or MR low |
| 7 BATTOK | Battery-OK status indicator | Asserts high when VBATT ≥ 2.6V; deasserts low if battery voltage drops below threshold |
| 8 BATTON | Battery-on status indicator | Active-high; signals entry into battery-backup mode (VCC < VTH and VBATT > VCC) |
| 9 WDO | Active-low watchdog output | Asserts low on watchdog timeout; cleared by next WDI edge or reset assertion |
| 10 PFO | Active-low power-fail output | Asserts when PFI input falls below 0.590V; used for system-level power-fail interrupt |
| 11 GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal performance |
| 12 RESET | Active-low reset output | Second reset output (open-drain); complements active-high RESET for flexible µP interface |
| 13 OUT | Switched output | Connects to VCC or BATT based on switchover logic; powers SRAM/RTC in backup mode |
| 14 CEOUT | Active-low chip-enable output | Gated version of CEIN; disabled during reset to prevent spurious memory writes |
| 15 CEIN | Chip-enable input | Passes through to CEOUT unless reset asserted; connect to GND or OUT if unused |
| 16 VCC | Main supply input | 1.53–5.5V operating range; bypass with 0.1µF capacitor to GND per pin |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | Reduces BATT leakage to ≤20nA at VBATT = 5.5V - prevents premature battery discharge during storage |
| On-board CE gating | 1.5ns CEIN-to-CEOUT propagation with 12µs hold time during reset - ensures atomic memory access during brownout |
| Watchdog timer | 1.2s typical timeout with edge-triggered clear - detects firmware lockup without CPU intervention |
| Low-line comparator | 2.5% higher threshold than reset voltage - delivers nonmaskable interrupt 100–200µs before reset assertion |
| UL® certification | Complies with IEC 60950-1 - satisfies safety requirements for industrial and commercial end equipment |
Applications
| GPS Receivers | Point-of-Sale Terminals |
|---|---|
Use Scenario: Maintains real-time clock and navigation data integrity during vehicle ignition cycling or battery disconnection. IC Role / Device Role / Timing Role: Supervisory controller providing VCC brownout detection, battery-backed SRAM power switchover, and CE gating during reset. Use Value: Prevents loss of last-known position and time stamp by ensuring uninterrupted power to RTC and flash memory during 100ms–500ms main supply gaps. |
Use Scenario: Secures transaction logs and configuration settings in retail kiosks subject to uncontrolled AC power loss. IC Role / Device Role / Timing Role: Dual-role supervisor: generates clean reset for ARM processor and gates CE lines to prevent partial writes to EEPROM during brownout. Use Value: Eliminates need for external backup capacitors or discrete MOSFET switches - reduces BOM count while guaranteeing data coherency. |
| Industrial PLC Modules | Portable Medical Monitors |
Use Scenario: Preserves sensor calibration data and runtime state in programmable logic controllers exposed to 24VDC rail fluctuations. IC Role / Device Role / Timing Role: Power integrity manager with PFI monitoring, watchdog supervision, and battery-OK/BATTON status reporting. Use Value: Enables deterministic fail-safe behavior: triggers controlled shutdown via LL interrupt, then maintains SRAM contents for 10+ years on coin cell. |
Use Scenario: Ensures ECG waveform buffer and patient ID retention during battery swap in handheld diagnostic devices. IC Role / Device Role / Timing Role: Memory protector with CE gating, 0.25µA battery-backup current, and BATT_TEST pulse for periodic health verification. Use Value: Meets IEC 62304 Class C software safety requirements by preventing memory corruption during hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16021PTET+ | Same pinout and core functionality, but includes active-high RESET output instead of active-low; identical CE gating and battery management | Preferred where µP requires active-high reset assertion without external inverter | Select MAX16021PTET+ only if system design mandates active-high reset polarity; otherwise MAX16020PTET+ offers direct compatibility with standard µP reset inputs |
| TPS3808G33DBVR | Single-supply supervisor (no battery switchover or CE gating); 3.3V reset threshold; 200ms timeout; SOT-23-6 package | Lacks battery backup, CE control, and dual reset outputs - suitable only for basic reset-only applications | Choose TPS3808G33DBVR only when battery backup and memory write protection are unnecessary; MAX16020PTET+ is not replaceable in systems requiring those functions |
Compared with MAX16021PTET+, MAX16020PTET+ provides native active-low reset compatibility with most µPs, while TPS3808G33DBVR omits critical battery and CE features - making MAX16020PTET+ irreplaceable in applications demanding coordinated memory protection and seamless power switchover.
Availability
MAX16020PTET+ is available at Aetrix Electronics and suitable for GPS receivers, point-of-sale terminals, and portable medical monitors requiring stable component supply across extended product lifecycles.
Supply support for MAX16020PTET+ 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, communications, and consumer applications.
The MAX160xx family targets µP-based systems needing integrated power supervision, battery backup, and memory write protection - optimized for reliability in space-constrained, battery-sensitive applications.
FAQ
What is the reset threshold voltage for MAX16020PTET+?
The MAX16020PTET+ has a fixed reset threshold of 3.100V (typical), with min/max values of 3.010V and 3.190V respectively. This threshold is factory-trimmed and specified over the full -40°C to +85°C temperature range. The value is designed specifically for reliable supervision of 3.3V power rails, and appears in Table 1b of the official datasheet as suffix 'T'. MAX16020PTET+ does not support user-adjustable thresholds.
Does MAX16020PTET+ support both active-high and active-low reset outputs?
Yes, MAX16020PTET+ provides two independent reset outputs: pin 6 is an active-high RESET, and pin 12 is an active-low RESET - both open-drain. This dual-output architecture allows direct interfacing with µPs requiring either polarity without external logic. Neither output is push-pull; external pullup resistors are required on both pins. MAX16020PTET+ does not include internal pullups on its reset outputs.
How does the CE gating function work in MAX16020PTET+?
In MAX16020PTET+, CE gating disables the CEIN-to-CEOUT path during reset assertion to prevent spurious memory writes. When reset is active, CEOUT is held low for 12µs if CEIN was low at reset onset, then pulled high to OUT. If CEIN is high when reset asserts, CEOUT remains high. Propagation delay is 1.5ns (typ) under normal operation. This behavior is confirmed in the Pin Description section and Functional Diagram for MAX16020.
What is the purpose of the BATT_TEST pin on MAX16020PTET+?
The BATT_TEST pin (pin 6 on MAX16020, not present on MAX16021) pulses low for 1.3 seconds every 24 hours to activate an external test load, enabling periodic verification of battery health. During this pulse, the device monitors VBATT; if voltage drops below 2.6V, BATTOK deasserts. This feature is exclusive to MAX16020 variants and is documented in the Pin Description and Detailed Description sections of the MAX16016/MAX16020/MAX16021 datasheet.
Can MAX16020PTET+ operate with a 1.8V supply?
Yes, MAX16020PTET+ operates from 1.53V to 5.5V, fully supporting 1.8V nominal supplies. Its reset threshold remains fixed at 3.100V, so it cannot supervise 1.8V rails directly - but it can monitor higher rails (e.g., 3.3V or 5V) while being powered from a separate 1.8V domain. The supply current at 1.8V is 2.0µA (typ), and VCC-to-OUT on-resistance rises to ~5.5Ω, as specified in the Electrical Characteristics table.
MAX16020PTET+ 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 Low
- Reset Timeout:
- 145ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX16020PTET+ FAQ
1.How can I place an order for MAX16020PTET+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020PTET+ 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 MAX16020PTET+ reliable?
The price and inventory of MAX16020PTET+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020PTET+ is usually 5 days.
3.What payment methods are accepted for MAX16020PTET+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020PTET+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020PTET+?
MAX16020PTET+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020PTET+ 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 MAX16020PTET+?
For technical support, including MAX16020PTET+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020PTET+ requirements.
6.How does Aetrix verify that MAX16020PTET+ is sourced from the original manufacturer or authorized distributors?
All MAX16020PTET+ 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 MAX16020PTET+ meets industry standards.
7.What is the process for return or replacement of MAX16020PTET+?
All MAX16020PTET+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020PTET+, 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 MAX16020PTET+ part is unused and in its original packaging.
Return procedure for MAX16020PTET+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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