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Analog Devices Inc./Maxim Integrated MAX16020PTET+T
- Part No.:
- MAX16020PTET+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020PTET+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,112
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Product details
Overview
MAX16020PTET+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 operates from 1.53V to 5.5V to protect SRAM/RTC in brownout conditions.
For engineers reviewing the MAX16020PTET+T datasheet, MAX16020PTET+T pinout, MAX16020PTET+T application, or MAX16020PTET+T equivalent, key selection criteria include its 16-pin TQFN package, open-drain reset output (suffix 'P'), 2.260V–2.390V reset threshold (suffix 'Z'), CEIN/CEOUT propagation delay of 1.5ns, and battery-OK/battery-on indicators for RTC backup integrity verification.
Technical Context
The MAX16020PTET+T implements a dual-path power-switching architecture: VCC-to-OUT when main supply is valid, and BATT-to-OUT during brownout-controlled by internal comparators with 2.5% hysteresis on low-line detection. Its CE gating logic disables memory write access within 12µs of reset assertion while maintaining 1.5ns signal pass-through during normal operation.
It integrates a 1.2s watchdog timer with WDI edge-triggered clearing, a 0.6V power-fail comparator (PFI/PFO) with 30mV hysteresis, and battery-test functionality that pulses BATT_TEST low for 1.3s every 24 hours-enabling autonomous health checks without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.260V (min) to 2.390V (max); fixed threshold for reliable 2.5V system supervision with ±1.5% temp drift. |
| Reset Timeout Period | 145ms (min); ensures µP reset hold time exceeds boot ROM initialization requirements. |
| Supply Current | 3.4µA (typ) at VCC = 5.5V; enables multi-year operation in battery-backed RTC/SRAM applications. |
| Battery-Backup Mode Current | 0.25µA (typ); minimizes battery drain during extended main-power outages. |
| CEIN to CEOUT Propagation Delay | 1.5ns (typ); supports high-speed µP/DSP interfaces without timing violation in CE-gated memory systems. |
| Watchdog Timeout | 1.235s (typ); provides deterministic firmware hang detection aligned with real-time task deadlines. |
| Power-Fail Comparator Threshold | 0.590V (typ), ±10mV tolerance; allows precise low-voltage monitoring down to 0.6V with noise immunity. |
Pinout & Package
MAX16020PTET+T 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 supports operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BATT | Backup battery input | Connects to lithium coin cell or supercapacitor; enables seamless switchover when VCC falls below reset threshold and VBATT > VCC. |
| 2 MR | Active-low manual reset input | Internally pulled up to VCC (30kΩ); asserts RESET on logic-low transition; debounced via 120ns glitch immunity. |
| 3 PFI | Power-fail comparator input | Accepts resistive divider output; referenced to 0.590V internal threshold with 30mV hysteresis for noise rejection. |
| 4 WDI | Watchdog timer input | Edge-sensitive; clears internal timer on rising/falling edges; disabled if left floating or three-stated. |
| 5 LL | Active-low low-line indicator | Asserts 2.5% above reset threshold to provide early warning NMI before reset, enabling graceful shutdown. |
| 6 BATT_TEST | Open-drain battery-test pulse output | Pulses low for 1.3s every 24h; used with external load to verify battery voltage remains ≥2.6V. |
| 7 BATTOK | Battery-OK status output | Asserts low when VBATT < 2.508V; indicates battery depletion before backup mode becomes unreliable. |
| 8 BATTON | Active-high battery-on indicator | Goes high only when device is actively sourcing OUT from BATT-confirms backup mode engagement. |
| 9 WDO | Active-low watchdog output | Asserts when WDI remains static >1.235s; resets on next WDI edge or RESET assertion. |
| 10 PFO | Active-low power-fail output | Complements PFI; goes low when VPFI < 0.590V and returns high after VPFI > 0.620V (hysteresis). |
| 11 GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal management (θJC = 6°C/W). |
| 12 RESET | Active-low reset output | Open-drain configuration (suffix 'P'); requires external pull-up; asserts during VCC brownout, MR low, or WDO timeout. |
| 13 OUT | Switched output | Delivers VCC or BATT to load (e.g., SRAM VDD); on-resistance ≤2.6Ω at 1.91V/10mA ensures minimal dropout. |
| 14 CEOUT | Active-low chip-enable output | Gates memory CE line; passes CEIN when RESET inactive; held low for 12µs after reset assertion to complete pending cycles. |
| 15 CEIN | Chip-enable input | Directly drives CEOUT during normal operation; high-impedance when RESET asserted to prevent spurious writes. |
| 16 VCC | Main supply input | Operates from 1.53V–5.5V; bypassed with 0.1µF ceramic capacitor; powers all internal circuits except PFI comparator (powered from OUT). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CE gating with 1.5ns propagation | Prevents memory corruption during brownout by disabling write access within 12µs of reset assertion while preserving µP interface timing. |
| Battery-freshness seal | Reduces BATT standby leakage to ±10nA, extending shelf life of backup power sources beyond 10 years. |
| Autonomous battery-test circuit | Generates periodic 1.3s BATT_TEST pulse every 24h-enables self-check without host processor involvement. |
| Low-line comparator (LL) | Provides 2.5% early-warning threshold relative to reset point, allowing nonmaskable interrupt-driven software shutdown before data loss. |
| UL®-certified IEC 60950-1 compliance | Validates safety for industrial and consumer end-equipment requiring regulatory approval without additional isolation components. |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
Use Scenario: Maintaining accurate timekeeping and calendar data during AC power loss in smart meters or industrial controllers. IC Role / Device Role / Timing Role: Supervisory IC providing VCC-to-BATT switchover, BATTON confirmation, and BATTOK health monitoring. Use Value: Ensures RTC continues operating with <0.25µA battery current and validates battery voltage ≥2.6V via autonomous BATT_TEST pulses. |
Use Scenario: Preventing corrupted writes to static RAM during voltage sag in GPS receivers or set-top boxes. IC Role / Device Role / Timing Role: CE gating controller that disables memory write access within 12µs of reset assertion while passing signals at 1.5ns latency during normal operation. Use Value: Eliminates need for external logic or FPGA-based write-protection schemes-reducing BOM count and PCB area. |
| Industrial Control Power Monitoring | Portable Medical Device Power Management |
Use Scenario: Detecting incipient power failure in PLC I/O modules to trigger safe state transitions before brownout. IC Role / Device Role / Timing Role: Dual-threshold supervisor using LL for early warning (NMI) and RESET for hard reset, both referenced to same VTH. Use Value: Enables deterministic 145ms reset hold time and 20µs LL response-meeting IEC 61000-4-11 immunity requirements. |
Use Scenario: Extending battery life in handheld diagnostic tools by minimizing quiescent current during standby. IC Role / Device Role / Timing Role: Ultra-low-power supervisor with 0.25µA battery-backup current and programmable watchdog timeout. Use Value: Supports >5-year shelf life on CR2032 coin cell while providing fail-safe reset and memory protection during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16021PTET+T | Includes active-high RESET output (pin 6) in addition to active-low RESET (pin 12); identical CE gating, battery monitoring, and timing specs. | Required where µP needs simultaneous active-high and active-low reset signaling for dual-rail or legacy compatibility. | Select MAX16021PTET+T only if dual-reset polarity is mandatory; otherwise MAX16020PTET+T offers identical functionality at lower cost. |
| TPS3808G33DBVR | Single-supply reset IC with 3.3V threshold; no battery switchover, CE gating, BATTOK, or BATT_TEST functions. | Limited to basic reset generation in non-backup applications; lacks integrated power-fail comparator and watchdog. | Choose TPS3808G33DBVR only for simple 3.3V reset needs without backup or memory protection-avoid for RTC/SRAM systems. |
Compared with MAX16021PTET+T, the MAX16020PTET+T omits the redundant active-high reset output but retains full battery supervision and CE gating-making it optimal for cost-sensitive, space-constrained designs where single-polarity reset suffices. Against TPS3808G33DBVR, MAX16020PTET+T delivers 5+ integrated functions (backup switchover, CE control, watchdog, PFI, battery test) in one die versus discrete solutions.
Availability
MAX16020PTET+T is available at Aetrix Electronics and suitable for industrial control, portable medical devices, and GPS navigation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16020PTET+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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX160xx family was designed specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection-targeting applications where reliability, low power, and small footprint are critical.
FAQ
What is the reset threshold voltage range for MAX16020PTET+T?
The MAX16020PTET+T has a fixed reset threshold range of 2.260V (minimum) to 2.390V (maximum), corresponding to the 'Z' suffix in its ordering code. This threshold is optimized for 2.5V systems and exhibits ±1.5% variation over the -40°C to +85°C operating temperature range, ensuring robust brownout detection without external resistor networks.
How does the CE gating function operate in MAX16020PTET+T during a reset event?
In MAX16020PTET+T, CE gating disconnects CEIN from CEOUT when RESET asserts. If CEIN is low at reset onset, CEOUT remains low for 12µs to complete any ongoing memory cycle, then pulls high to OUT. If CEIN is high, CEOUT stays high throughout reset-preventing spurious writes while maintaining signal integrity for read operations.
What is the purpose of the BATT_TEST pin on MAX16020PTET+T?
The BATT_TEST pin on MAX16020PTET+T outputs a 1.3s open-drain low pulse every 24 hours to activate an external load (e.g., resistor) across the backup battery. This draws current to verify battery voltage remains ≥2.6V; if BATTOK deasserts during the test, it signals imminent battery failure-enabling predictive maintenance in field-deployed equipment.
Can MAX16020PTET+T operate with a 1.8V main supply?
Yes, MAX16020PTET+T supports VCC from 1.53V to 5.5V, making it fully compatible with 1.8V systems. Its reset threshold (2.260V–2.390V) is higher than 1.8V, so it cannot supervise the 1.8V rail directly-but it can monitor a higher auxiliary rail (e.g., 3.3V) while powering downstream logic from 1.8V via OUT, provided VCC ≥ VTH for internal operation.
What package type and RoHS status does MAX16020PTET+T use?
MAX16020PTET+T uses a 16-pin 4mm × 4mm TQFN-EP package with exposed pad (EP) connected to GND. The '+T' suffix confirms it is lead(Pb)-free and RoHS-compliant per EU Directive 2011/65/EU, with matte-tin surface finish and reflow profile compatible with J-STD-020D (peak 240°C).
MAX16020PTET+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:
- 3.1V
- 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+T FAQ
1.How can I place an order for MAX16020PTET+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020PTET+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 MAX16020PTET+T reliable?
The price and inventory of MAX16020PTET+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020PTET+T is usually 5 days.
3.What payment methods are accepted for MAX16020PTET+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020PTET+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020PTET+T?
MAX16020PTET+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020PTET+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 MAX16020PTET+T?
For technical support, including MAX16020PTET+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020PTET+T requirements.
6.How does Aetrix verify that MAX16020PTET+T is sourced from the original manufacturer or authorized distributors?
All MAX16020PTET+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 MAX16020PTET+T meets industry standards.
7.What is the process for return or replacement of MAX16020PTET+T?
All MAX16020PTET+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020PTET+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 MAX16020PTET+T part is unused and in its original packaging.
Return procedure for MAX16020PTET+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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