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Analog Devices Inc./Maxim Integrated MAX16020LTES+
- Part No.:
- MAX16020LTES+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020LTES+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
MAX16020LTES+ 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 minimum reset timeout, supports 1.53V–5.5V operation, and provides CEIN-to-CEOUT propagation delay of 1.5ns for SRAM write protection in GPS and industrial control systems.
For engineers reviewing the MAX16020LTES+ datasheet, MAX16020LTES+ pinout, MAX16020LTES+ application, or MAX16020LTES+ equivalent, key selection criteria include its 16-pin TQFN package, push-pull reset output, battery-OK/battery-on indicators, watchdog timer (1.2s typ), and CE gating with 12µs reset hold time-critical for reliable memory backup during brownout.
Technical Context
The MAX16020LTES+ 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 and VBATT. Its internal CE gating latches CEIN state on reset assertion and holds CEOUT low for 12µs if CEIN is low at reset onset-preventing partial writes to CMOS RAM.
It integrates five independent supervisory functions: reset generation (with 145–285ms timeout), watchdog timer (0.83–1.64s), power-fail comparator (0.572–0.611V threshold), low-line warning (2.5% above reset threshold), and battery health monitoring (BATTOK at 2.508–2.673V, BATTON, BATT_TEST pulse every 24h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.010V (min) to 3.190V (max) - precisely targets 3.0V system brownout detection |
| Reset Timeout Period | 145ms (min) - ensures µP completes full initialization before release |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables ultra-low-power operation in always-on systems |
| Battery-Backup Mode Current | 0.25µA (typ) - extends coin-cell life beyond 10 years in RTC/SRAM backup |
| CEIN-to-CEOUT Propagation Delay | 1.5ns - supports high-speed µP/DSP interfaces without timing violation |
| Watchdog Timeout | 1.235s (typ) - balances fault detection responsiveness with software execution margin |
| Power-Fail Input Threshold | 0.590V (typ), ±30mV hysteresis - enables accurate low-voltage monitoring down to 0.6V |
Pinout & Package
MAX16020LTES+ uses a 16-pin 4mm × 4mm TQFN-EP package with exposed pad (EP) connected to GND for thermal management. Pin 1 is BATT; pin 16 is VCC; EP must be soldered to a large ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Backup battery input | Connects to coin cell; enables automatic switchover when VCC drops below reset threshold and VBATT > VCC |
| MR (Pin 2) | Active-low manual reset input | Asserts RESET on logic-low; includes 30kΩ internal pullup; debounced internally |
| PFI (Pin 3) | Power-fail comparator input | Monitors divided-down VCC against 0.590V reference; triggers PFO when voltage falls below threshold |
| WDI (Pin 4) | Watchdog timer input | Clears watchdog on rising/falling edge; timeout asserts WDO if no transition occurs within 1.235s |
| LL (Pin 5) | Active-low low-line output | Asserts 2.5% above reset threshold-provides early NMI for orderly shutdown before reset |
| BATT_TEST (Pin 6) | Battery-test pulse output | Drives open-drain low for 1.3s every 24h to verify battery health under load |
| RESET (Pin 12) | Active-low reset output | Push-pull drive; asserts during VCC brownout, MR low, or watchdog timeout; holds for ≥145ms |
| CEIN (Pin 15) | Chip-enable input | Directly controls CE gating path; low during memory access; gated off during reset to prevent corruption |
| CEOUT (Pin 14) | Active-low chip-enable output | Passes CEIN when reset inactive; held low for 12µs after reset assertion if CEIN was low |
| VCC (Pin 16) | Main supply input | Accepts 1.53V–5.5V; powers all internal circuits except BATT-dependent paths |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | Prevents premature battery discharge via <20nA leakage until first power-up |
| On-board CE gating with 1.5ns delay | Eliminates need for external logic; preserves µP timing integrity during SRAM write cycles |
| Integrated battery health monitoring | BATTOK indicates voltage ≥2.508V; BATT_TEST pulses every 24h to validate under load |
| Low-line warning (LL) output | Triggers 2.5% above reset threshold-enables nonmaskable interrupt for graceful shutdown |
| UL® certification (IEC 60950-1) | Validated for safety compliance in industrial and consumer end-equipment |
Applications
| GPS Receivers | Industrial PLCs |
|---|---|
Use Scenario: Maintaining real-time clock and navigation data during vehicle ignition cycling or antenna signal loss. IC Role / Device Role / Timing Role: Supervisory controller providing battery-backed SRAM retention, brownout reset, and early low-VCC warning via LL output. Use Value: Prevents GPS position drift and session loss by ensuring uninterrupted RTC and ephemeris storage during 100ms–500ms main power gaps. | Use Scenario: Preserving I/O configuration and process state during factory floor power sags or maintenance outages. IC Role / Device Role / Timing Role: Dual-role supervisor: resets CPU on brownout and gates CE to lock SRAM during voltage instability. Use Value: Eliminates spurious writes to control registers by holding CEOUT low for 12µs during reset-guaranteeing deterministic state recovery. |
| Point-of-Sale Terminals | Portable Medical Devices |
Use Scenario: Securing transaction logs and encryption keys during AC adapter disconnection or battery swap. IC Role / Device Role / Timing Role: Memory protector with battery switchover, watchdog supervision, and BATTOK health verification. Use Value: Ensures PCI-DSS-compliant data persistence using 0.25µA battery-backup current-extending CR2032 life to >12 years. | Use Scenario: Retaining patient settings and calibration data during transport or low-battery conditions in handheld diagnostics. IC Role / Device Role / Timing Role: Low-power supervisor enabling fail-safe memory backup, battery-status signaling, and orderly shutdown via LL-triggered NMI. Use Value: Meets IEC 62304 Class C requirements by guaranteeing SRAM integrity through 100% duty-cycle battery operation with <1µA standby draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16021LTES+ | Same pinout and core functions, but features active-high RESET output instead of active-low | Requires PCB-level logic inversion or µP firmware adaptation for reset signal polarity | Select when host µP requires active-high reset assertion or when redesign allows signal polarity change |
| TPS3808G33DBVR | Single-supply reset IC only-no battery switchover, CE gating, BATTOK, or watchdog timer | Limited to basic reset generation; cannot replace MAX16020LTES+ in battery-backed memory systems | Choose only for cost-sensitive designs where battery backup and memory protection are unnecessary |
Compared with MAX16021LTES+, the MAX16020LTES+ offers native active-low reset compatibility with legacy µPs; versus TPS3808G33DBVR, it delivers full system supervision-battery switchover, CE gating, and multi-output status signaling-in a single 16-pin TQFN.
Availability
MAX16020LTES+ is available at Aetrix Electronics and suitable for GPS receivers, industrial PLCs, point-of-sale terminals, and portable medical devices requiring stable component supply across extended product lifecycles.
Supply support for MAX16020LTES+ 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 computing applications.
The MAX16020LTES+ belongs to Maxim's µP supervisory family, engineered specifically for systems requiring coordinated power monitoring, battery-backed memory protection, and deterministic reset sequencing in space-constrained, low-power environments.
FAQ
What is the reset threshold voltage range for MAX16020LTES+?
The MAX16020LTES+ has a guaranteed reset threshold range of 3.010V (minimum) to 3.190V (maximum), with a typical value of 3.100V. This range is optimized for reliable supervision of 3.0V nominal power rails, and the threshold exhibits minimal temperature drift-±0.5% over –40°C to +85°C-as confirmed in the device's normalized threshold vs. temperature plot (toc10).
Does MAX16020LTES+ support battery-backed SRAM write protection?
Yes, MAX16020LTES+ provides hardware-enforced SRAM write protection via its dedicated CEIN/CEOUT gating circuitry. When RESET asserts, CEOUT is immediately held low for 12µs if CEIN was low at assertion time-blocking partial writes. The 1.5ns propagation delay ensures compatibility with high-speed µPs, and the internal transmission gate maintains low on-resistance (<50Ω) for clean signal pass-through during normal operation.
How does the battery-test function operate in MAX16020LTES+?
The MAX16020LTES+ includes an autonomous BATT_TEST output that pulses low for 1.3 seconds every 24 hours. This controlled load test verifies battery health under realistic discharge conditions. Concurrently, the BATTOK output remains high only if VBATT stays above 2.508V-ensuring that SRAM backup remains viable. Both signals are active only when VCC is present, preventing false triggers during battery-only operation.
What is the purpose of the LL (low-line) output on MAX16020LTES+?
The LL output on MAX16020LTES+ is an active-low early-warning signal that asserts when VCC falls to 2.5% above the device's reset threshold-typically ~3.175V for a 3.100V threshold. It enables µPs to trigger a nonmaskable interrupt (NMI) and execute an orderly software shutdown before RESET asserts, preserving data integrity and avoiding uncontrolled reboots during gradual brownouts.
Can MAX16020LTES+ operate with a 1.8V supply rail?
No, MAX16020LTES+ is not rated for 1.8V system supervision. Its fixed reset threshold range (3.010V–3.190V) and minimum operating voltage of 1.53V are designed for 3.0V and 3.3V systems. For 1.8V rails, Maxim specifies alternative variants such as MAX16020LWES+ (1.733V threshold) or MAX16020LYES+ (2.192V threshold); the LTES+ suffix explicitly denotes the 3.0V-range version.
MAX16020LTES+ 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:
- 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+ FAQ
1.How can I place an order for MAX16020LTES+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020LTES+ 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+ reliable?
The price and inventory of MAX16020LTES+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020LTES+ is usually 5 days.
3.What payment methods are accepted for MAX16020LTES+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020LTES+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020LTES+?
MAX16020LTES+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020LTES+ 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+?
For technical support, including MAX16020LTES+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020LTES+ requirements.
6.How does Aetrix verify that MAX16020LTES+ is sourced from the original manufacturer or authorized distributors?
All MAX16020LTES+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16020LTES+?
All MAX16020LTES+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020LTES+, 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+ part is unused and in its original packaging.
Return procedure for MAX16020LTES+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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