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Analog Devices Inc./Maxim Integrated MAX16020LTER+T
- Part No.:
- MAX16020LTER+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16020LTER+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,223
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Product details
Overview
MAX16020LTER+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 - designed for write-protecting SRAM during brownout in RTC and portable memory systems.
For engineers reviewing the MAX16020LTER+T datasheet, MAX16020LTER+T pinout, MAX16020LTER+T application, or MAX16020LTER+T equivalent, key selection criteria include its 16-pin TQFN package, push-pull reset output (suffix 'L'), fixed 4.684V typical reset threshold, CEIN/CEOUT 1.5ns propagation delay, and battery-OK/battery-on indicators for reliable backup power management.
Technical Context
The MAX16020LTER+T integrates four core supervisory 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 gating to prevent memory corruption; and power-fail detection down to 0.6V via PFI/PFO. Its architecture includes a precision bandgap reference, watchdog timer with 1.2s typical timeout, and low-line comparator with 2.5% hysteresis above reset threshold.
It features dual-supply operation (VCC and VBATT), battery-freshness seal, debounced manual reset input (MR), and UL®-certified compliance per IEC 60950-1. The device supports both push-pull and open-drain outputs - MAX16020LTER+T uses push-pull RESET and WDO, enabling direct interface with µP reset inputs without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.684V (typical), ±1.5% accuracy over -40°C to +85°C - ensures precise brownout detection for 5V systems |
| Reset Timeout Period | 145ms (min), 215ms (typ), 285ms (max) - guarantees sufficient hold time for µP initialization |
| Supply Current | 3.4µA (typ) at VCC = 5.5V; 0.25µA in battery-backup mode - enables multi-year operation on coin cell |
| VCC-to-OUT On-Resistance | 2.6Ω (typ) at VCC = 1.91V, IOUT = 10mA - minimizes voltage drop during main power delivery |
| CEIN-to-CEOUT Propagation Delay | 1.5ns (typ), 7ns (max) - supports high-speed µP/DSP CE timing without added latency |
| Watchdog Timeout | 0.83s (min), 1.235s (typ), 1.64s (max) - provides robust firmware hang detection with temperature stability |
| Power-Fail Input Threshold | 0.590V (typ), ±10mV tolerance - enables accurate low-voltage monitoring down to sub-1V rails |
Pinout & Package
MAX16020LTER+T 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 full rated current in industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BATT | Backup battery input | Connects to coin cell; enables automatic switchover to battery when VCC < VTH and VBATT > VCC |
| 2 MR | Active-low manual reset input | Internally pulled up to VCC (30kΩ); asserts reset on logic-low transition with 120ns delay |
| 3 PFI | Power-fail comparator input | Monitors external voltage divider; triggers PFO when input falls below 0.590V threshold |
| 4 WDI | Watchdog timer input | Clears internal timer on rising/falling edge; timeout asserts WDO if no transition occurs within 1.235s |
| 5 LL | Active-low low-line output | Asserts 2.5% above reset threshold - provides early warning NMI before reset for orderly shutdown |
| 6 BATT_TEST | Open-drain battery-test pulse output | Pulses low for 1.3s every 24h; used with external load to verify battery health without continuous drain |
| 7 BATTOK | Battery-OK status indicator | Goes low when VBATT < 2.6V - signals end-of-life condition for backup battery |
| 8 BATTON | Active-high battery-on indicator | Asserts high only during valid battery-backup mode - confirms switchover integrity |
| 9 WDO | Active-low watchdog output | Push-pull output; deasserts high on next WDI edge or reset assertion - directly drives µP WDI or NMI |
| 10 PFO | Active-low power-fail output | Push-pull output; complements PFI input - indicates system power failure condition |
| 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; meets µP reset timing requirements with 0.3V VOL at 3.2mA sink current |
| 13 OUT | Switched output | Delivers VCC or BATT to load (e.g., SRAM VDD); auto-selects source based on voltage and reset state |
| 14 CEOUT | Active-low chip-enable output | Gates CE signal to memory; disabled during reset to prevent spurious writes - 12µs hold time after CEIN low |
| 15 CEIN | Chip-enable input | Directly connects to µP CE; passes through to CEOUT unless reset is asserted |
| 16 VCC | Main supply input | Operates from 1.53V–5.5V; bypass with ≥0.1µF ceramic capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CE gating with 1.5ns propagation delay | Prevents memory corruption during brownout by disabling CE path within nanoseconds of reset assertion |
| Battery-freshness seal | Reduces BATT leakage to ≤20nA - preserves shelf life of backup batteries for >10 years |
| UL®-certified IEC 60950-1 compliance | Validated safety certification eliminates need for additional system-level isolation in industrial equipment |
| Dual-mode reset output (push-pull) | Eliminates external pull-up resistors and reduces BOM count while ensuring fast, rail-to-rail reset signaling |
| Debounced manual reset input | Internal 30kΩ pull-up and 100ns glitch immunity enable direct switch connection without RC filters |
| Low-line comparator with 2.5% hysteresis | Provides deterministic early-warning interrupt prior to reset - enables software-controlled graceful shutdown |
Applications
| Real-Time Clock (RTC) Backup Power | CMOS SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining timekeeping and calendar data in GPS modules during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Supervisory controller managing VCC-to-BATT switchover, asserting BATTON to confirm backup mode, and holding RESET until stable. Use Value: Ensures RTC retains accuracy across 10+ year battery life with <0.25µA backup current and verified switchover at 4.684V threshold. |
Use Scenario: Preventing data corruption in point-of-sale terminals during AC power interruption. IC Role / Device Role / Timing Role: Gating CE signal to SRAM using CEIN/CEOUT path, disabling writes during brownout while maintaining read capability. Use Value: Eliminates need for external logic or FPGA-based CE control - 1.5ns CE propagation delay ensures compatibility with 100MHz µPs. |
| Industrial Control Panel Power Monitoring | Portable Medical Device Battery Management |
|
Use Scenario: Detecting undervoltage events in PLC I/O modules to trigger safe I/O shutdown before reset. IC Role / Device Role / Timing Role: Generating LL output 2.5% above reset threshold to deliver nonmaskable interrupt for firmware-initiated diagnostics. Use Value: Provides 20µs LL response time and 145ms reset timeout - enables deterministic 50ms firmware response window before hardware reset. |
Use Scenario: Verifying lithium coin cell health in handheld glucose meters without draining battery between measurements. IC Role / Device Role / Timing Role: Executing autonomous 1.3s BATT_TEST pulses every 24h and asserting BATTOK only if VBATT ≥ 2.6V. Use Value: Reduces battery test overhead to <1µC per day - extends usable battery life by >30% versus continuous monitoring schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTER+T | Same 16-pin TQFN package and pinout, but open-drain RESET/WDO outputs instead of push-pull | Requires external pull-up resistors; suitable where level-shifting or wired-OR logic is needed | Select MAX16020PTER+T only when interfacing with mixed-voltage µPs or shared reset buses |
| MAX16021LTER+T | Identical electrical specs and package, but includes active-high RESET output (pin 6) alongside active-low RESET (pin 12) | Supports dual-reset architectures requiring both polarities - e.g., legacy µP + FPGA co-processing | Choose MAX16021LTER+T only when simultaneous active-high and active-low reset signals are required |
Compared with MAX16020PTER+T, MAX16020LTER+T eliminates external pull-ups and simplifies layout; compared with MAX16021LTER+T, it reduces pin count and cost where single-polarity reset suffices - making MAX16020LTER+T optimal for cost-sensitive, space-constrained µP systems needing guaranteed push-pull drive strength.
Availability
MAX16020LTER+T is available at Aetrix Electronics and suitable for real-time clock backup, CMOS SRAM write protection, and industrial power monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16020LTER+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 and mixed-signal ICs for power, sensing, and connectivity in industrial, automotive, and computing systems.
The MAX16020LTER+T belongs to Maxim's µP supervisory product line, engineered specifically for reliable memory backup, brownout resilience, and CE-gated write protection in battery-critical embedded systems.
FAQ
What is the reset threshold voltage of the MAX16020LTER+T?
The MAX16020LTER+T has a fixed reset threshold of 4.684V (typical), with a range of 4.520V (min) to 4.852V (max) across temperature and process variation. This value is confirmed in Table 1b of the datasheet and applies specifically to the 'L' suffix variant. The threshold remains stable within ±1.5% over the full -40°C to +85°C operating range, making MAX16020LTER+T suitable for 5V system supervision with tight margin requirements.
Does the MAX16020LTER+T support battery-backed SRAM applications?
Yes, the MAX16020LTER+T is explicitly designed for battery-backed SRAM applications. It automatically switches the OUT pin from VCC to BATT when VCC falls below the 4.684V reset threshold and VBATT exceeds VCC. The device provides BATTON and BATTOK outputs to monitor backup mode and battery health, and its 0.25µA battery-backup supply current ensures multi-year operation on standard CR2032 cells - all confirmed in the General Description and Detailed Description sections for MAX16020LTER+T.
How does the CE gating function work on the MAX16020LTER+T?
The MAX16020LTER+T uses CEIN and CEOUT pins to gate memory chip-enable signals during brownout. When reset is not asserted, CEIN passes directly to CEOUT with 1.5ns propagation delay. When reset asserts and CEIN is low, CEOUT remains low for 12µs to complete ongoing memory access; then it goes high and stays high regardless of CEIN transitions. This behavior prevents spurious writes and is validated in Figure 22 (toc22) and the CE Signal Gating section of the MAX16020LTER+T datasheet.
What is the purpose of the BATT_TEST pin on the MAX16020LTER+T?
The BATT_TEST pin on the MAX16020LTER+T provides an open-drain, timed pulse (1.3s low every 24 hours) to activate an external load for battery voltage verification. When combined with the BATTOK output - which deasserts low if VBATT drops below 2.6V - this enables autonomous, low-overhead battery health monitoring. The 1.3s pulse duration and 24h interval are fixed characteristics of MAX16020LTER+T, minimizing average current draw to less than 1µA per day.
Is the MAX16020LTER+T RoHS-compliant and lead-free?
Yes, the MAX16020LTER+T is RoHS-compliant and lead-free, as indicated by the '+T' suffix in the part number. The '+' denotes lead(Pb)-free/RoHS-compliant packaging, and the 'T' specifies tape-and-reel delivery. This is explicitly stated in the Ordering Information section of the datasheet and verified through Maxim's official product documentation for MAX16020LTER+T.
MAX16020LTER+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:
- 2.64V
- 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)
MAX16020LTER+T FAQ
1.How can I place an order for MAX16020LTER+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16020LTER+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 MAX16020LTER+T reliable?
The price and inventory of MAX16020LTER+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16020LTER+T is usually 5 days.
3.What payment methods are accepted for MAX16020LTER+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16020LTER+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16020LTER+T?
MAX16020LTER+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16020LTER+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 MAX16020LTER+T?
For technical support, including MAX16020LTER+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16020LTER+T requirements.
6.How does Aetrix verify that MAX16020LTER+T is sourced from the original manufacturer or authorized distributors?
All MAX16020LTER+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 MAX16020LTER+T meets industry standards.
7.What is the process for return or replacement of MAX16020LTER+T?
All MAX16020LTER+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16020LTER+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 MAX16020LTER+T part is unused and in its original packaging.
Return procedure for MAX16020LTER+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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