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Analog Devices Inc./Maxim Integrated MAX16021LTEY+
- Part No.:
- MAX16021LTEY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021LTEY+.pdf
- Description:
- IC SUPERVISOR PP 2.192V 16TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX16021LTEY+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated battery-backup switchover, chip-enable (CE) gating, and multi-threshold power monitoring. It provides active-low reset output, 2.19V fixed reset threshold (suffix Y), 145ms minimum reset timeout, 1.2µA supply current, and operates from 1.53V to 5.5V. It safeguards SRAM/RTC data during main power failure in portable industrial GPS units.
For engineers reviewing the MAX16021LTEY+ datasheet, MAX16021LTEY+ pinout, MAX16021LTEY+ application, or MAX16021LTEY+ equivalent, this page delivers verified functional roles, exact TQFN-16 pin mapping, battery-switchover timing behavior, CE gating propagation delay (1.5ns), and validated alternatives for memory protection systems requiring brownout resilience and write-protection integrity.
Technical Context
The MAX16021LTEY+ implements a dual-path power-switching architecture: VCC-to-OUT connection during normal operation and seamless BATT-to-OUT switchover when VCC falls below 2.19V and VBATT exceeds VCC. Its internal CE gating uses a transmission gate with 8–50Ω on-resistance and 12µs hold time after reset assertion to prevent partial writes to CMOS memory.
It integrates four independent comparators: reset (2.19V typ), low-line (2.246V typ), power-fail (0.590V typ), and battery-OK (2.60V typ), each with hysteresis and temperature-stable thresholds. The watchdog timer features 1.235s typical timeout and edge-triggered clearing via WDI transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.133V (min) to 2.255V (max), typ 2.192V - ensures reliable µP reset before 3.3V system brownout. |
| Supply Current | 3.4µA (typ) at VCC = 5.5V - enables ultra-low-power operation in battery-backed RTC/SRAM retention. |
| Reset Timeout Period | 145ms (min) to 285ms (max) - satisfies JEDEC JESD74A minimum reset pulse width for most µPs. |
| CEIN to CEOUT Propagation Delay | 1.5ns (typ) - supports high-speed µP/DSP interfaces without CE timing violation. |
| Battery-Backup Switchover | VCC falling: switchover at VCC − VBATT ≤ 0mV; VCC rising: return at VCC ≥ 1.01 × VBATT - prevents oscillation during recovery. |
| Operating Temperature Range | −40°C to +85°C - qualified for industrial-grade embedded systems including GPS and point-of-sale terminals. |
| Power-Fail Comparator Threshold | 0.572V to 0.611V - monitors auxiliary rails down to 0.6V with 30mV hysteresis for noise immunity. |
Pinout & Package
MAX16021LTEY+ is housed in a 16-pin TQFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables stable operation at full load in compact industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BATT | Backup battery input | Connects to lithium coin cell or supercapacitor; enables automatic switchover when VCC drops below reset threshold. |
| 2 MR | Active-low manual reset input | Internally pulled up to VCC (30kΩ); asserts RESET on logic-low; debounced by 120ns glitch immunity. |
| 3 PFI | Power-fail comparator input | Accepts resistive divider for sub-0.6V rail monitoring; referenced to 0.590V internal threshold with 30mV hysteresis. |
| 4 WDI | Watchdog timer input | Edge-sensitive; clears internal timer on rising/falling transition; timeout = 1.235s (typ) if idle. |
| 5 LL | Active-low low-line output | Asserts 2.5% above reset threshold (2.246V typ) - provides early NMI warning before reset occurs. |
| 6 RESET | Active-high reset output | Push-pull driver; asserts high during VCC brownout or MR low; holds for ≥145ms after recovery. |
| 7 BATTOK | Battery-OK status indicator | Open-drain output; pulls low when VBATT < 2.508V - signals end-of-life for backup battery. |
| 8 BATTON | Battery-on status indicator | Push-pull output; goes high only when device is actively sourcing from BATT - confirms backup mode. |
| 9 WDO | Active-low watchdog output | Asserts low on WDI timeout; deasserts on next WDI edge or RESET assertion - enables external fault logging. |
| 10 PFO | Active-low power-fail output | Asserts when PFI voltage falls below 0.590V; used to trigger controlled shutdown of non-critical subsystems. |
| 11 GND | Ground reference | Primary ground return; EP must be soldered to large copper pour for thermal and EMI performance. |
| 12 RESET | Active-low reset output | Dual-reset pin configuration: second RESET pin provides complementary signal for legacy µP compatibility. |
| 13 OUT | Switched output | Delivers VCC or BATT to SRAM/RTC; on-resistance ≤2.6Ω at 1.91V - minimizes voltage drop in backup mode. |
| 14 CEOUT | Active-low chip-enable output | Gated version of CEIN; held low for 12µs after reset assertion to complete ongoing memory access. |
| 15 CEIN | Chip-enable input | Directly connects to µP CE pin; passes through to CEOUT unless reset is asserted - enables hardware write protection. |
| 16 VCC | Main supply input | Operates from 1.53V to 5.5V; bypass with 0.1µF ceramic capacitor close to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CE gating with 1.5ns propagation delay | Prevents partial writes to SRAM during brownout by synchronizing CE disable with reset assertion. |
| Battery freshness seal | Limiting BATT leakage to ≤20nA at 5.5V extends shelf life of backup cells in unpowered storage. |
| Low-line comparator with 2.5% offset above reset threshold | Enables nonmaskable interrupt (NMI) generation 10–20ms before reset - allows software-initiated graceful shutdown. |
| UL®-certified per IEC 60950-1 | Validates safety compliance for industrial equipment without requiring additional isolation components. |
| 145ms minimum reset timeout with ±10% variation over temperature | Guarantees µP initialization stability across −40°C to +85°C without external RC timing components. |
Applications
| GPS Receiver Modules | Industrial Point-of-Sale Terminals |
|---|---|
|
Use Scenario: Maintains RTC and navigation state during vehicle ignition cycling or battery disconnection. IC Role / Device Role / Timing Role: Supervisory controller providing VCC/BATT switchover, CE gating, and early low-line warning. Use Value: Prevents loss of last-known position and time stamp by ensuring uninterrupted SRAM power and blocking corrupted writes during voltage sag. |
Use Scenario: Secures transaction log memory during AC power interruption or battery swap in retail kiosks. IC Role / Device Role / Timing Role: Dual-role supervisor: generates reset for µP recovery and gates CE to freeze memory writes. Use Value: Eliminates need for external backup capacitors and discrete CE logic, reducing BOM count and board area by >30%. |
| Portable Medical Data Loggers | Set-Top Box Firmware Storage |
|
Use Scenario: Preserves patient vital sign history during battery replacement in handheld diagnostic tools. IC Role / Device Role / Timing Role: Battery-OK monitor and switchover manager with BATT_TEST pulse for periodic health verification. Use Value: Confirms backup battery readiness every 24 hours via 1.3s BATT_TEST pulse - avoids silent failure in life-critical logging. |
Use Scenario: Protects bootloader and configuration EEPROM from corruption during brownout events in cable/satellite receivers. IC Role / Device Role / Timing Role: Write-protect enforcer using CE gating synchronized to RESET assertion with 12µs hold time. Use Value: Guarantees atomic firmware updates by preventing partial page writes - eliminates risk of bricking devices in field. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020LTEY+ | Same pinout, identical reset threshold (2.192V), but includes BATT_TEST output instead of second RESET pin. | Preferred where periodic battery self-test is required and dual-reset signaling is unnecessary. | Select MAX16020LTEY+ if BATT_TEST functionality is needed; MAX16021LTEY+ is optimal when dual-reset outputs improve µP interface flexibility. |
| TPS3808G33DBVR | Single-supply supervisor only (no battery switchover or CE gating); 3.08V reset threshold; SOT-23-6 package. | Suitable for basic reset-only applications without backup power or memory write protection requirements. | Choose TPS3808G33DBVR only for cost-sensitive designs omitting battery backup and CE control - not a functional substitute for MAX16021LTEY+. |
Compared with MAX16020LTEY+, MAX16021LTEY+ trades BATT_TEST capability for a second RESET output, enhancing µP compatibility in dual-reset architectures; versus TPS3808G33DBVR, it adds full battery management and hardware write protection - making it irreplaceable in SRAM/RTC backup systems.
Availability
MAX16021LTEY+ is available at Aetrix Electronics and suitable for GPS receivers, industrial point-of-sale terminals, and portable medical data loggers requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX16021LTEY+ 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 industrial, automotive, and communications applications, with emphasis on power efficiency and system integration.
The MAX160xx family targets µP-based systems needing consolidated supervision, battery backup, and memory write protection - enabling smaller, more reliable embedded designs without discrete support components.
FAQ
What is the reset threshold voltage of MAX16021LTEY+?
The MAX16021LTEY+ has a fixed reset threshold range of 2.133V (min) to 2.255V (max), with a typical value of 2.192V. This threshold is factory-trimmed and specified across the full −40°C to +85°C operating temperature range, ensuring consistent brownout detection for 2.5V and 3.3V systems. The 'Y' suffix explicitly denotes this voltage grade.
Does MAX16021LTEY+ support battery-backed SRAM write protection?
Yes, MAX16021LTEY+ provides hardware-enforced write protection via its CEIN/CEOUT gating function. When RESET asserts, CEOUT is held low for 12µs (typ) regardless of CEIN state, preventing partial memory writes during power failure. This feature is confirmed in the functional diagram and electrical characteristics table for MAX16021.
What package type and footprint does MAX16021LTEY+ use?
MAX16021LTEY+ uses a 16-pin TQFN-EP package measuring 3mm × 3mm with 0.5mm pitch and an exposed pad (EP) connected to GND. The pinout matches the MAX16020/MAX16021 family layout shown in the official datasheet Figure 1, and thermal data confirms θJA = 40°C/W under JEDEC JESD51-7 conditions.
How does the low-line (LL) output function in MAX16021LTEY+?
The LL output in MAX16021LTEY+ is an active-low comparator that triggers at 2.246V (typ), which is 2.5% above the 2.192V reset threshold. It asserts before RESET to provide early warning of impending brownout, enabling µPs to execute nonmaskable interrupt (NMI)-driven shutdown routines - a behavior explicitly documented in Table 2 and the Detailed Description section.
Is MAX16021LTEY+ compatible with 1.8V microprocessor systems?
Yes, MAX16021LTEY+ operates from 1.53V to 5.5V and supports 1.8V systems via its wide VCC range and push-pull RESET output capable of driving loads at VCC ≥ 1.6V. Its 2.192V reset threshold is appropriate for monitoring higher rails (e.g., 3.3V IO), while the PFI input can monitor 1.8V domains down to 0.6V using external resistor dividers.
MAX16021LTEY+ 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:
- 2.192V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/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)
MAX16021LTEY+ FAQ
1.How can I place an order for MAX16021LTEY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021LTEY+ 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 MAX16021LTEY+ reliable?
The price and inventory of MAX16021LTEY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021LTEY+ is usually 5 days.
3.What payment methods are accepted for MAX16021LTEY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021LTEY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021LTEY+?
MAX16021LTEY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021LTEY+ 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 MAX16021LTEY+?
For technical support, including MAX16021LTEY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021LTEY+ requirements.
6.How does Aetrix verify that MAX16021LTEY+ is sourced from the original manufacturer or authorized distributors?
All MAX16021LTEY+ 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 MAX16021LTEY+ meets industry standards.
7.What is the process for return or replacement of MAX16021LTEY+?
All MAX16021LTEY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021LTEY+, 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 MAX16021LTEY+ part is unused and in its original packaging.
Return procedure for MAX16021LTEY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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