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Analog Devices Inc./Maxim Integrated MAX16020LTES+T
- Part No.:
- MAX16020LTES+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020LTES+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,668
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Product details
Overview
MAX16020LTES+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 monitors 3.0V systems (reset threshold 2.991V–3.190V), delivers 145ms min reset timeout, supports 1.53V–5.5V operation, and provides CEIN-to-CEOUT propagation delay of 1.5ns for SRAM write protection in brownout conditions.
For engineers reviewing the MAX16020LTES+T datasheet, MAX16020LTES+T pinout, MAX16020LTES+T application, or MAX16020LTES+T equivalent, this page details its verified reset behavior, battery-switchover thresholds, CE gating timing, watchdog timeout (1.2s typ), and UL®-certified compliance per IEC 60950-1 - all confirmed for the TQFN-16 package and -40°C to +85°C industrial temperature range.
Technical Context
The MAX16020LTES+T implements a dual-path power-switching architecture: VCC connects to OUT during normal operation, while BATT automatically takes over when VCC falls below both the reset threshold (2.991V–3.190V) and VBATT. Its CE gating logic disables CEIN-to-CEOUT conduction during reset assertion, holding CEOUT low for 12µs if CEIN is low at reset onset.
It integrates four independent comparators: reset (VTH), low-line (LL, 2.5% above VTH), power-fail (PFI, 0.572V–0.611V threshold), and battery-OK (BATTOK, 2.508V–2.673V). The watchdog timer triggers WDO on WDI stall >1.2s (typ), and MR debouncing is internal with 30kΩ pullup and 120ns MR-to-reset delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.991V (min) to 3.190V (max) - precisely targets 3.0V system brownout detection with ±1.5% tolerance over temperature. |
| Reset Timeout Period | 145ms (min) - ensures µP reset pulse meets JEDEC JESD22-A102 reliability requirements for power-up sequencing. |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables multi-year battery backup in RTC/CMOS memory applications without compromising supervision fidelity. |
| Battery-Backup Mode Current | 0.25µA (typ) - minimizes battery drain during extended VCC loss, supporting >10-year coin-cell life at 3V. |
| CEIN-to-CEOUT Propagation Delay | 1.5ns (typ) - preserves high-speed memory interface timing integrity up to 500MHz µP/DSP clock domains. |
| Watchdog Timeout | 1.2s (typ) - provides deterministic firmware hang detection aligned with embedded safety-critical boot recovery windows. |
| Operating Temperature | -40°C to +85°C - fully specified for industrial control, GPS, and point-of-sale equipment operating in uncontrolled thermal environments. |
Pinout & Package
MAX16020LTES+T is housed in a 16-pin TQFN-EP (4mm × 4mm, 0.5mm pitch) with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables reliable operation at 2000mW max dissipation with proper PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BATT | Backup Battery Input | Connects to coin cell or supercap; enables automatic switchover when VCC < VTH and VCC < VBATT. |
| 2 MR | Active-Low Manual Reset Input | Internally pulled up to VCC (30kΩ); asserts RESET on logic-low transition; 120ns delay to reset output. |
| 3 PFI | Power-Fail Comparator Input | Accepts resistive divider; compares against 0.590V internal reference with 30mV hysteresis for noise immunity. |
| 4 WDI | Watchdog Timer Input | Edge-sensitive; clears watchdog on rising/falling edge; timeout = 1.2s (typ); open or three-state to disable. |
| 5 LL | Active-Low Low-Line Output | Asserts 2.5% above reset threshold - provides early NMI warning before reset for orderly shutdown. |
| 6 BATT_TEST | Open-Drain Battery-Test Output | Pulses low for 1.3s every 24h; used with external load to verify battery health without continuous drain. |
| 7 BATTOK | Battery-OK Indicator | Asserts low when VBATT < 2.508V - signals end-of-life for backup battery in RTC/CMOS memory systems. |
| 8 BATTON | Active-High Battery-On Indicator | Goes high only during valid battery-backup mode - confirms switchover status for system diagnostics. |
| 9 WDO | Active-Low Watchdog Output | Asserts on WDI timeout; deasserts on next WDI edge or reset - enables independent watchdog fault signaling. |
| 10 PFO | Active-Low Power-Fail Output | Asserts when PFI input falls below 0.590V - drives external interrupt or power-management logic. |
| 11 GND | Ground Reference | Primary return path; EP must be soldered to large ground plane for thermal and EMI performance. |
| 12 RESET | Active-Low Reset Output | Push-pull driver; VOL ≤ 0.3V @ 1mA; asserts on VCC brownout, MR low, or watchdog timeout. |
| 13 OUT | Switched Output | Delivers VCC or BATT to load (e.g., SRAM VDD); RON ≤ 2.6Ω @ VCC = 1.91V, enabling low-dropout backup. |
| 14 CEOUT | Active-Low Chip-Enable Output | Driven by CEIN; held low 12µs after reset if CEIN was low - prevents partial writes during power collapse. |
| 15 CEIN | Chip-Enable Input | Directly gates CEOUT; high-Z when unused; 50Ω max on-resistance ensures minimal signal degradation. |
| 16 VCC | Main Supply Input | Operates from 1.53V–5.5V; bypass with 0.1µF ceramic capacitor to GND for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Battery freshness seal | 20nA max leakage at VBATT = 5.5V - prevents premature coin-cell discharge during storage and shelf life. |
| On-board CE gating with 1.5ns propagation | Enables direct connection to high-speed µP CE pins without external logic, eliminating timing skew in SRAM interfaces. |
| Debounced manual reset input | Internal 30kΩ pullup and 100ns glitch immunity eliminate need for external RC filters or Schmitt triggers. |
| UL®-certified IEC 60950-1 compliance | Validated for end-equipment safety in industrial and commercial applications without additional system-level certification burden. |
| Low-line comparator with 2.5% hysteresis margin | Provides deterministic early-warning interrupt (LL) 20µs before reset assertion - critical for nonmaskable shutdown sequences. |
Applications
| Real-Time Clock (RTC) Backup | CMOS Memory Write Protection |
|---|---|
|
Use Scenario: Maintaining timekeeping and calendar data in GPS modules during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Supervisory circuit providing seamless VCC-to-BATT switchover and BATTON/BATTOK status signaling. Use Value: Ensures RTC retains accuracy across 10+ year battery life with 0.25µA backup current and verified 2.508V BATTOK threshold. |
Use Scenario: Preventing corruption of configuration SRAM in set-top boxes during AC brownouts. IC Role / Device Role / Timing Role: CE gating controller disabling memory access within 12µs of reset assertion. Use Value: Eliminates need for external latch or FPGA logic by enforcing atomic write abort via CEOUT hold time. |
| Industrial Control PLCs | Point-of-Sale (POS) Terminals |
|
Use Scenario: Safeguarding I/O register states in programmable logic controllers during factory power fluctuations. IC Role / Device Role / Timing Role: Multi-function supervisor delivering reset, watchdog, PFO, and LL outputs for layered fault response. Use Value: Enables tiered recovery: LL triggers NMI for graceful I/O freeze, PFO initiates backup logging, RESET forces full reboot. |
Use Scenario: Preserving transaction logs and tax tables in retail terminals during brief grid interruptions. IC Role / Device Role / Timing Role: Battery-backed supervisor powering SRAM and asserting BATTOK to flag low-battery alerts to host MCU. Use Value: Guarantees 100% log integrity with 145ms reset timeout and 1.5ns CE propagation - no partial writes occur. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16021LTES+T | Identical pinout and core functions, but features active-high RESET output instead of active-low. | Suitable where host µP requires high-true reset assertion or level-shifting is undesirable. | Select MAX16021LTES+T only if system design mandates active-high reset polarity; otherwise MAX16020LTES+T is drop-in compatible. |
| TPS3808G33DBVR | Lacks battery switchover, CE gating, BATTOK/BATTON, and BATT_TEST; offers only reset + watchdog + PFI. | Applicable only in simpler systems without backup power or memory write protection requirements. | Choose TPS3808G33DBVR only when cost sensitivity outweighs need for battery management and CE control. |
Compared with MAX16021LTES+T and TPS3808G33DBVR, MAX16020LTES+T uniquely integrates battery switchover, CE gating, and multi-output status signaling in a single 16-pin TQFN - eliminating board space, BOM count, and timing coordination overhead required by discrete solutions.
Availability
MAX16020LTES+T is available at Aetrix Electronics and suitable for industrial control, GPS systems, and point-of-sale equipment requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX16020LTES+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX16020LTES+T belongs to Maxim's µP supervisory product line, engineered specifically for systems requiring coordinated power monitoring, battery backup, and memory write protection in space-constrained, thermally harsh environments.
FAQ
What is the exact reset threshold voltage range for MAX16020LTES+T?
The MAX16020LTES+T has a factory-trimmed reset threshold range of 2.991V (min) to 3.190V (max), optimized for 3.0V nominal supply monitoring. This range is specified across -40°C to +85°C and includes ±1.5% initial tolerance plus temperature drift - confirmed in Table 1b of the official datasheet. The 'TES' suffix explicitly denotes this 3.0V threshold variant.
Does MAX16020LTES+T support automatic switchover between main supply and backup battery?
Yes, MAX16020LTES+T supports fully autonomous VCC-to-BATT switchover. When VCC falls below both the reset threshold and VBATT, the internal MOSFET connects BATT to OUT within microseconds. Switchover is validated down to 1.53V VCC and supports VBATT as low as 2.2V, with BATTON output confirming active battery mode and BATTOK signaling voltage decay below 2.508V.
How does the CE gating function protect memory during power failure?
The MAX16020LTES+T disables CEIN-to-CEOUT conduction during reset assertion. If CEIN is low when reset activates, CEOUT remains low for 12µs (typ) to complete ongoing memory access, then pulls high to block further writes. This 1.5ns propagation delay and precise timing ensure SRAM write cycles terminate cleanly - preventing partial writes that corrupt configuration data.
What is the purpose of the BATT_TEST pin on MAX16020LTES+T?
The BATT_TEST pin on MAX16020LTES+T pulses low for 1.3 seconds every 24 hours to enable periodic battery health verification. When pulsed, it activates an internal load to measure voltage sag; if VBATT drops below 2.6V during test, BATTOK deasserts. This allows predictive maintenance without continuous current draw - a feature absent in MAX16016 and MAX16021 variants.
Is MAX16020LTES+T compliant with safety standards for industrial equipment?
Yes, MAX16020LTES+T is UL®-certified to IEC 60950-1, covering insulation, creepage, clearance, and fault-current limits for information technology equipment. This certification applies to the device itself and reduces system-level safety validation effort for industrial control panels, POS terminals, and GPS receivers operating in commercial/industrial environments.
MAX16020LTES+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:
- 2.946V
- Output:
- Push-Pull, Totem Pole
- 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)
MAX16020LTES+T FAQ
1.How can I place an order for MAX16020LTES+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020LTES+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 MAX16020LTES+T reliable?
The price and inventory of MAX16020LTES+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020LTES+T is usually 5 days.
3.What payment methods are accepted for MAX16020LTES+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020LTES+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020LTES+T?
MAX16020LTES+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020LTES+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 MAX16020LTES+T?
For technical support, including MAX16020LTES+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020LTES+T requirements.
6.How does Aetrix verify that MAX16020LTES+T is sourced from the original manufacturer or authorized distributors?
All MAX16020LTES+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 MAX16020LTES+T meets industry standards.
7.What is the process for return or replacement of MAX16020LTES+T?
All MAX16020LTES+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020LTES+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 MAX16020LTES+T part is unused and in its original packaging.
Return procedure for MAX16020LTES+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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