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Analog Devices Inc./Maxim Integrated MAX16020PTEZ+
- Part No.:
- MAX16020PTEZ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020PTEZ+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
MAX16020PTEZ+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and watchdog timer functionality. It monitors 1.8V–5V power supplies, provides 145ms reset timeout, 1.2µA supply current, and operates from -40°C to +85°C in a 16-pin TQFN package. It is used to protect SRAM/RTC data integrity during main power failure in portable and industrial systems.
For engineers reviewing the MAX16020PTEZ+ datasheet, MAX16020PTEZ+ pinout, MAX16020PTEZ+ application, or MAX16020PTEZ+ equivalent, key selection criteria include its open-drain reset output (suffix 'P'), 16-pin TQFN-EP package, CEIN/CEOUT propagation delay of 1.5ns, battery-freshness seal, and UL® certification to IEC60950-1.
Technical Context
The MAX16020PTEZ+ implements a dual-path power-switching architecture: VCC-to-OUT and BATT-to-OUT, controlled by internal comparators and a switchover threshold of VCC − VBATT = 0.1 × VCC (rising) and 0 mV (falling). Its CE gating logic disables memory write access during brownout via a transmission gate with 8–50Ω on-resistance and 12µs hold time after reset assertion.
It integrates four independent supervisory blocks: a reset generator with 145–285ms timeout and ±1.5% threshold accuracy over temperature; a 1.2s watchdog timer with edge-triggered WDI input; a 0.59V power-fail comparator (PFI/PFO) with 30mV hysteresis; and a low-line (LL) comparator set 2.5% above reset threshold for early warning NMI generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.640V typical (suffix 'P' per Table 1b), enabling reliable monitoring of 2.5V/3.3V systems with ±1.5% drift over -40°C to +85°C |
| Supply Current | 5µA max at VCC = 5.5V; 0.5µA max in battery-backup mode - enables multi-year operation on coin-cell backup |
| Reset Timeout | 145ms minimum, 285ms maximum - ensures µP reset pulse meets JEDEC JESD72B requirements for stable initialization |
| CE Propagation Delay | 1.5ns typical (50Ω source, 50pF load) - supports high-speed µP/DSP interfaces up to 200MHz without timing violation |
| Watchdog Timeout | 1.235s typical (0.83–1.64s range) - provides robust firmware hang detection while accommodating slow clock domains |
| Power-Fail Threshold | 0.590V ±19mV (PFI), referenced to OUT - allows precise low-voltage monitoring down to 0.6V with noise immunity |
| Operating Temp Range | -40°C to +85°C - fully specified for industrial and automotive under-hood environments without derating |
Pinout & Package
MAX16020PTEZ+ 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 at 2000mW max dissipation with proper PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Backup battery input | Accepts 0–5.5V; enables seamless switchover to backup power when VCC falls below reset threshold and VBATT > VCC |
| MR (Pin 2) | Active-low manual reset input | Internally pulled up to OUT via 30kΩ; asserts RESET on logic-low; debounced with 120ns glitch immunity |
| PFI (Pin 3) | Power-fail comparator input | Monitors external voltage divider; triggers PFO when input falls below 0.59V; powered from OUT for rail-independent operation |
| WDI (Pin 4) | Watchdog timer input | Edge-sensitive; clears watchdog on rising/falling transition; 320ns min pulse width; tolerates floating or three-state inputs |
| LL (Pin 5) | Active-low low-line indicator | Asserts 2.5% above reset threshold - provides early warning NMI before reset, enabling orderly software shutdown |
| BATT_TEST (Pin 6) | Battery-test pulse output | Open-drain; pulses low for 1.3s every 24h to verify battery health; deasserts BATTOK if VBATT < 2.6V |
| BATTOK (Pin 7) | Battery-OK status output | Push-pull; goes low when battery voltage drops below 2.6V threshold - enables system-level battery health reporting |
| BATTON (Pin 8) | Battery-on indicator | Push-pull; asserts high only during active battery-backup mode - confirms switchover completion and backup power delivery |
| WDO (Pin 9) | Active-low watchdog output | Asserts low on watchdog timeout; resets on next WDI edge or RESET assertion - decouples watchdog action from reset domain |
| PFO (Pin 10) | Active-low power-fail output | Complements PFI input; asserts low when VPFI < 0.59V; includes 30mV hysteresis to prevent chatter near threshold |
| GND (Pin 11) | Ground reference | Primary signal return; EP pad must be soldered to large ground plane for thermal and EMI performance |
| RESET (Pin 12) | Active-low reset output | Open-drain (suffix 'P'); sinks 3.2mA at VOL ≤ 0.3V; requires external pullup; asserts on VCC brownout, MR, or watchdog timeout |
| OUT (Pin 13) | Switched output | Delivers regulated VCC or BATT to load; on-resistance ≤ 5.5Ω at 1.91V/10mA - minimizes voltage drop in backup mode |
| CEOUT (Pin 14) | Active-low chip-enable output | Drives memory CE; pulled up to OUT; gated off during reset to prevent spurious writes; 12µs hold time ensures write completion |
| CEIN (Pin 15) | Chip-enable input | Directly controls CEOUT path; low impedance input; disconnects from CEOUT during reset - isolates memory control during fault |
| VCC (Pin 16) | Main supply input | 1.53–5.5V operating range; powers all internal circuits except PFI comparator (powered from OUT) |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | 20nA max leakage at VBATT = 5.5V - preserves shelf life of backup batteries for >10 years in storage |
| On-board CE gating | 1.5ns propagation delay and 12µs post-reset hold time - prevents memory corruption without external logic or timing constraints |
| UL® IEC60950-1 certification | Validated safety compliance - eliminates need for additional isolation or certification effort in end-equipment safety approvals |
| Low-line (LL) comparator | 2.5% higher threshold than reset - delivers deterministic early-warning interrupt for firmware-controlled graceful shutdown |
| Debounced manual reset | 120ns glitch immunity and internal 30kΩ pullup - enables direct switch connection without external RC or Schmitt trigger |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining RTC timekeeping and calendar data during AC power loss in smart meters or industrial controllers. IC Role / Device Role / Timing Role: Supervisory IC providing automatic VCC-to-BATT switchover, BATTON confirmation, and BATTOK health monitoring. Use Value: Ensures uninterrupted RTC operation with <0.55µA battery standby current and verified 10-year coin-cell lifetime. |
Use Scenario: Preventing corrupted writes to static RAM during brownout in GPS navigation units or point-of-sale terminals. IC Role / Device Role / Timing Role: CE gating controller disabling memory access within 1.5ns of fault detection and holding CEOUT low for 12µs. Use Value: Eliminates need for external latch or FPGA logic, reducing BOM count and PCB area while guaranteeing data integrity. |
| Industrial Control Power Monitoring | Portable Medical Device Power Management |
|
Use Scenario: Detecting incipient power failure in PLC I/O modules to initiate safe state transitions before reset. IC Role / Device Role / Timing Role: Dual-threshold supervisor using LL for early NMI and RESET for hard reset, both referenced to same VCC rail. Use Value: Provides two-stage response: 2.5% early warning (LL) followed by guaranteed reset (RESET) - avoids false triggers and missed events. |
Use Scenario: Managing backup power for volatile configuration registers in handheld ultrasound or glucose monitors. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor (1.2µA active, 0.25µA backup) with battery-test pulse and health indicators. Use Value: Extends single-charge battery life by >15% versus discrete solutions and enables field-upgradable battery health diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16021TTEZ+ | Same pinout and features, but push-pull RESET output (suffix 'T') instead of open-drain ('P') | Requires no external pullup resistor; better suited for systems needing active-high reset signaling or driving multiple loads | Select MAX16021TTEZ+ when board layout lacks space for pullup or when interfacing with µPs requiring driven-high reset signals |
| TPS3808G33DBVR | Single-supply supervisor only (no BATT switchover, no CE gating, no BATTOK/BATTON) | Limited to basic reset generation; lacks battery management and memory protection functions | Choose TPS3808G33DBVR only for cost-sensitive designs where battery backup and CE control are unnecessary |
Compared with MAX16020PTEZ+, MAX16021TTEZ+ offers identical supervision and gating but simplifies reset interface design, while TPS3808G33DBVR reduces feature set and bill-of-materials cost at the expense of system-level power resilience and data integrity safeguards.
Availability
MAX16020PTEZ+ is available at Aetrix Electronics and suitable for industrial control, portable medical devices, and GPS navigation systems requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for MAX16020PTEZ+ 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 applications.
The MAX160xx family was designed specifically for µP-based systems requiring integrated power supervision, battery backup, and memory write protection - targeting applications where data retention and fail-safe behavior are critical.
FAQ
What is the reset threshold voltage of the MAX16020PTEZ+?
The MAX16020PTEZ+ has a typical reset threshold of 2.640V (minimum 2.568V, maximum 2.716V) as defined by its 'P' suffix in Table 1b. This value is factory-trimmed and remains stable across -40°C to +85°C with ±1.5% variation. The threshold is referenced to VCC and used to detect brownout conditions that trigger the 145ms reset timeout. MAX16020PTEZ+ does not support user-adjustable thresholds.
Does the MAX16020PTEZ+ support battery backup for external memory?
Yes, the MAX16020PTEZ+ directly supports battery backup for external CMOS memory via its OUT pin, which automatically switches from VCC to BATT when VCC falls below the reset threshold and VBATT exceeds VCC. Its CEIN/CEOUT gating function further protects memory by disabling chip-enable during brownout. MAX16020PTEZ+ specifies ≤5.5Ω VCC-to-OUT on-resistance and <0.55µA battery standby current at VBATT = 3V.
How does the CE gating function work on the MAX16020PTEZ+?
The MAX16020PTEZ+ uses CEIN and CEOUT pins to gate memory chip-enable signals: during normal operation, CEIN connects to CEOUT through a low-resistance transmission gate (8–50Ω); when RESET asserts, CEOUT is held low for 12µs (typical) regardless of CEIN state, then pulled high to OUT. This prevents spurious writes during power faults. MAX16020PTEZ+ achieves 1.5ns propagation delay under 50pF load.
Is the MAX16020PTEZ+ UL® certified?
Yes, the MAX16020PTEZ+ is UL® certified to conform to IEC60950-1, as explicitly stated in the Features section of its datasheet. This certification validates its safety compliance for use in end equipment requiring regulatory approval, including industrial and medical devices. MAX16020PTEZ+ carries this certification natively - no additional external components or layout modifications are required to meet the standard.
What is the watchdog timeout period for the MAX16020PTEZ+?
The MAX16020PTEZ+ features a watchdog timer with a typical timeout period of 1.235 seconds, ranging from 0.83s to 1.64s over temperature and supply voltage. It is triggered when the WDI input remains static (high or low) beyond this interval. The watchdog clears on any WDI edge or when RESET asserts. MAX16020PTEZ+ supports disabling the watchdog by leaving WDI unconnected or tri-stating its driver.
MAX16020PTEZ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.323V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 145ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX16020PTEZ+ FAQ
1.How can I place an order for MAX16020PTEZ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020PTEZ+ 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 MAX16020PTEZ+ reliable?
The price and inventory of MAX16020PTEZ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020PTEZ+ is usually 5 days.
3.What payment methods are accepted for MAX16020PTEZ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020PTEZ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020PTEZ+?
MAX16020PTEZ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020PTEZ+ 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 MAX16020PTEZ+?
For technical support, including MAX16020PTEZ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020PTEZ+ requirements.
6.How does Aetrix verify that MAX16020PTEZ+ is sourced from the original manufacturer or authorized distributors?
All MAX16020PTEZ+ 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 MAX16020PTEZ+ meets industry standards.
7.What is the process for return or replacement of MAX16020PTEZ+?
All MAX16020PTEZ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020PTEZ+, 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 MAX16020PTEZ+ part is unused and in its original packaging.
Return procedure for MAX16020PTEZ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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