My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16021PTEW+
- Part No.:
- MAX16021PTEW+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEW+.pdf
- Description:
- IC SUPERVISOR OD 1.661V 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,792
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16021PTEW+ 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 1.8V–5V supply rails, provides 145ms reset timeout, delivers <1.2µA operating current (0.25µA in battery-backup mode), and supports 16-pin TQFN packaging for RTC and SRAM backup in portable industrial systems.
For engineers reviewing the MAX16021PTEW+ datasheet, MAX16021PTEW+ pinout, MAX16021PTEW+ application, or MAX16021PTEW+ equivalent, key selection criteria include its open-drain reset output (suffix 'W'), 1.616V typical reset threshold, 1.5ns CEIN-to-CEOUT propagation delay, and UL® certification to IEC 60950-1 for safety-critical embedded designs.
Technical Context
The MAX16021PTEW+ implements dual-path power switching between VCC and BATT using internal MOSFETs, with switchover triggered when VCC falls below both the reset threshold and VBATT. Its CE gating logic disables memory write access during brownout by holding CEOUT low for 12µs after reset assertion, then actively pulling CEOUT high to OUT.
It integrates a 1.2s watchdog timer with WDI edge-triggered clearing, a 0.590V power-fail comparator (PFI) with 30mV hysteresis, and a low-line (LL) output asserting at 2.5% above the reset threshold - all operating across -40°C to +85°C with full specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.616V (typical); enables reliable brownout detection for 1.8V systems with ±2.5% tolerance over temperature |
| Reset Timeout Period | 145ms (min); ensures µP reset pulse meets minimum hold-time requirements for ARM Cortex-M and similar cores |
| Supply Current | 1.2µA (max at 5.5V); minimizes quiescent drain on primary supply in always-on monitoring applications |
| Battery-Backup Current | 0.25µA (typical at VCC = 0V); extends shelf life of coin-cell backup for >10-year RTC/SRAM retention |
| CEIN-to-CEOUT Delay | 1.5ns (typical); supports high-speed memory interfaces up to 500MHz without timing violation |
| Power-Fail Threshold | 0.590V ±19mV; allows precise PFI resistor-divider design for early warning of supply collapse down to 0.6V |
| Operating Temperature | -40°C to +85°C; fully specified for industrial-grade reliability without derating |
Pinout & Package
MAX16021PTEW+ is housed in a 16-pin 4mm × 4mm TQFN-EP package with exposed pad (EP) connected internally to GND. Thermal resistance θJA = 40°C/W enables operation at full rating in compact PCB layouts without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 | Physical pin numbers per TQFN layout | Match top-view pinout: BATT (1), MR (2), PFI (3), WDI (4), LL (5), RESET (6), BATTOK (7), BATTON (8), WDO (9), PFO (10), GND (11), RESET (12), OUT (13), CEOUT (14), CEIN (15), VCC (16) |
| VCC (Pin 16) | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry and drives push-pull outputs; requires 0.1µF bypass to GND |
| BATT (Pin 1) | Backup battery input | Connects to coin cell or supercap; supplies OUT during VCC brownout; leakage <10nA when VCC active |
| CEIN (Pin 15) / CEOUT (Pin 14) | Chip-enable signal path | Enables hardware write-protection of SRAM/RTC; CEOUT gated off during reset with 12µs hold time and 1.5ns pass-through delay |
| RESET (Pin 6 & 12) | Dual active-low reset outputs | Pin 6 = active-high RESET (MAX16021-specific); Pin 12 = active-low RESET; both asserted during VCC brownout or MR pull-down |
| LL (Pin 5) | Low-line warning output | Asserts 2.5% above reset threshold to trigger NMI for orderly shutdown before reset occurs |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | Prevents premature discharge via 100nA internal leakage path until first power-up, extending shelf life of unused units |
| On-board CE gating | Eliminates need for external logic or discrete MOSFETs to protect SRAM writes during power failure |
| Debounced manual reset | Internal 30kΩ pull-up and 100ns glitch immunity enable direct switch connection without external RC filtering |
| UL®-certified safety compliance | IEC 60950-1 certification simplifies end-equipment safety approval for medical, industrial, and POS systems |
| Watchdog timer with edge-clearing | WDI rising/falling edge resets timer - avoids false triggers from noisy or floating inputs in battery-powered devices |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining accurate timekeeping and calendar data during AC power loss in smart meters and industrial controllers. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-BATT switchover, BATTON signaling, and BATTOK health monitoring. Use Value: Enables >10-year RTC retention on CR2032 via 0.25µA battery-backup current and freshness seal. |
Use Scenario: Preventing corruption of configuration or calibration data stored in static RAM during brownout in GPS modules and set-top boxes. IC Role / Device Role / Timing Role: Hardware-enforced CE gating that blocks write cycles within 1.5ns of reset assertion. Use Value: Eliminates software-based write-protection routines and guarantees data integrity without µP intervention. |
| Industrial Control Power Monitoring | Portable/Battery-Powered Equipment |
|
Use Scenario: Detecting incipient power rail collapse in PLC I/O modules to initiate safe state transition before system lockup. IC Role / Device Role / Timing Role: Dual-threshold supervision using LL (early warning) and RESET (hard reset) outputs. Use Value: Provides 20µs LL-to-RESET latency margin for NMI-driven firmware shutdown sequences. |
Use Scenario: Extending runtime and ensuring reliable boot in handheld test equipment powered by Li-ion or alkaline cells. IC Role / Device Role / Timing Role: Low-quiescent supervisor managing main/battery priority, watchdog supervision, and battery-test pulsing. Use Value: Reduces total system standby current to <2µA including watchdog, enabling multi-month battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEZ+ | Same 16-pin TQFN package; identical pinout except BATT_TEST replaces LL; reset threshold 1.528V (Z suffix) | Lacks LL output but adds periodic battery-test pulse; better suited for applications requiring automated battery health verification | Select MAX16020PTEZ+ when battery self-test functionality is required and low-line warning is unnecessary |
| TPS3808G16DBVR | Single-supply reset IC only; no battery switchover, CE gating, or watchdog; SOT-23-6 package; 1.6V threshold | Provides basic reset supervision only; cannot replace MAX16021PTEW+ in battery-backup or memory protection roles | Choose TPS3808G16DBVR only for cost-sensitive, space-constrained designs needing only reset generation |
Compared with MAX16020PTEZ+, MAX16021PTEW+ offers early brownout warning via LL instead of battery testing; compared with TPS3808G16DBVR, it delivers full system supervision with integrated power-path control and memory protection - making it irreplaceable in RTC/SRAM backup architectures.
Availability
MAX16021PTEW+ is available at Aetrix Electronics and suitable for real-time clock backup, CMOS SRAM write protection, and industrial power monitoring requiring stable component supply, long-lifecycle support, and certified safety compliance.
Supply support for MAX16021PTEW+ 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 management and reliability.
The MAX16021 belongs to Maxim's µP supervisory family engineered specifically for fail-safe memory backup and deterministic power sequencing in mission-critical embedded systems.
FAQ
What is the reset threshold voltage for MAX16021PTEW+?
The MAX16021PTEW+ has a typical reset threshold of 1.616V (minimum 1.528V, maximum 1.710V), corresponding to the 'W' suffix in its ordering code. This value is factory-trimmed and guaranteed over -40°C to +85°C, enabling robust brownout detection for 1.8V systems without external resistor dividers.
Does MAX16021PTEW+ support both VCC and battery power sources simultaneously?
Yes - MAX16021PTEW+ automatically switches OUT between VCC and BATT based on voltage comparison: OUT connects to VCC when VCC > VBATT and above reset threshold; it switches to BATT only when VCC falls below both the reset threshold and VBATT, ensuring uninterrupted power to SRAM or RTC during mains failure.
How does the CE gating function work in MAX16021PTEW+?
In MAX16021PTEW+, CEIN feeds directly to CEOUT during normal operation (reset deasserted) with 1.5ns propagation delay. When reset asserts, CEOUT is held low for 12µs if CEIN was low, then actively pulled high to OUT - blocking erroneous writes while allowing read completion, all without µP involvement.
What is the purpose of the LL (Low-Line) output on MAX16021PTEW+?
The LL output on MAX16021PTEW+ asserts when VCC drops to 2.5% above the reset threshold - providing an early warning signal prior to reset assertion. This allows the µP to execute an orderly software shutdown routine via nonmaskable interrupt (NMI), improving system robustness during gradual brownout conditions.
Is MAX16021PTEW+ RoHS-compliant and lead-free?
Yes - the '+' suffix in MAX16021PTEW+ explicitly denotes a lead(Pb)-free and RoHS-compliant package. The device meets EU RoHS Directive 2011/65/EU and is qualified for reflow soldering at peak temperatures up to +240°C per JEDEC J-STD-020.
MAX16021PTEW+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.661V
- Output:
- Open Drain or Open Collector
- 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)
MAX16021PTEW+ FAQ
1.How can I place an order for MAX16021PTEW+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEW+ 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 MAX16021PTEW+ reliable?
The price and inventory of MAX16021PTEW+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEW+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTEW+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEW+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEW+?
MAX16021PTEW+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEW+ 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 MAX16021PTEW+?
For technical support, including MAX16021PTEW+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEW+ requirements.
6.How does Aetrix verify that MAX16021PTEW+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEW+ 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 MAX16021PTEW+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTEW+?
All MAX16021PTEW+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEW+, 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 MAX16021PTEW+ part is unused and in its original packaging.
Return procedure for MAX16021PTEW+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16021PTEW+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
