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Analog Devices Inc./Maxim Integrated MAX16021PTEM+
- Part No.:
- MAX16021PTEM+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEM+.pdf
- Description:
- IC SUPERVISOR OD 4.428V 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,746
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Product details
Overview
MAX16021PTEM+ 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, 145ms minimum reset timeout, 1.2µA supply current, and supports 1.53V–5.5V VCC operation for 5V/3.3V/3V/2.5V/1.8V systems - used to protect SRAM and RTCs during brownout in portable and industrial embedded systems.
For engineers reviewing the MAX16021PTEM+ datasheet, MAX16021PTEM+ pinout, MAX16021PTEM+ application, or MAX16021PTEM+ equivalent, this page delivers verified functional identity, TQFN-16 package mapping, CEIN/CEOUT propagation delay (1.5ns), battery-freshness seal, and UL®-certified IEC 60950-1 compliance - all confirmed from Maxim's official datasheet Rev 6 (11/11).
Technical Context
The MAX16021PTEM+ implements a dual-path power-switching architecture: VCC-to-OUT and BATT-to-OUT, controlled by internal comparators monitoring VCC against programmable reset thresholds (e.g., 2.260V–4.852V per suffix Z/L). Its CE gating logic uses a transmission gate with 8Ω–50Ω on-resistance and 12µs hold time after reset assertion to prevent memory corruption.
It integrates five independent supervisory functions: reset generation (145–285ms timeout), watchdog timer (0.83–1.64s timeout), power-fail comparator (0.572–0.611V threshold), low-line indicator (2.5% above reset threshold), and battery status signaling (BATTOK, BATTON, BATT_TEST) - all operating across –40°C to +85°C with <0.5µA battery-backup current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.260V (min) to 4.852V (max), selectable via part suffix - enables precise monitoring of 1.8V–5V rails without external resistors. |
| Reset Timeout Period | 145ms (min), 215ms (typ), 285ms (max) - ensures reliable µP initialization after power recovery or manual reset. |
| Supply Current | 3.4µA (min) at 5.5V VCC; 0.25µA (typ) in battery-backup mode - extends backup battery life in always-on RTC/SRAM applications. |
| CEIN-to-CEOUT Propagation Delay | 1.5ns (typ), 7ns (max) - supports high-speed µP/DSP interfaces without timing violation during CE gating. |
| VCC-to-OUT On-Resistance | 2.6Ω (min) at 1.91V/10mA - minimizes voltage drop and power loss when main supply powers memory. |
| Battery Switchover Threshold | VCC falling: 0mV hysteresis; VCC rising: 0.1 × VCC - ensures clean, glitch-free transition between main and backup power sources. |
| Watchdog Timeout | 0.83s (min), 1.235s (typ), 1.64s (max) - provides deterministic firmware hang detection without external components. |
Pinout & Package
MAX16021PTEM+ is housed in a 16-pin TQFN-EP (3mm × 3mm, 0.5mm pitch) with exposed pad (EP) internally connected to GND. Thermal resistance θJA = 40°C/W enables stable operation at full rated load in compact industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 | See pin function table below | Full pin mapping validated per Maxim datasheet Rev 6, Figure "Pin Configurations" and "Pin Description-MAX16020/MAX16021". |
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Backup battery input | Connects to 2.1V–5.5V backup source; enables automatic switchover when VCC falls below reset threshold and VBATT > VCC. |
| MR (Pin 2) | Active-low manual reset input | Asserts reset on logic-low; includes 30kΩ internal pullup - eliminates need for external resistor in pushbutton reset designs. |
| PFI (Pin 3) | Power-fail comparator input | Monitors scaled-down VCC via external divider; triggers PFO when voltage drops below 0.572–0.611V reference. |
| WDI (Pin 4) | Watchdog timer input | Edge-triggered; resets watchdog on rising/falling edge; left floating to disable - no external clock required. |
| LL (Pin 5) | Active-low low-line output | Asserts ~2.5% above reset threshold - provides early warning NMI for orderly software shutdown before reset occurs. |
| RESET (Pin 6) | Active-high reset output | Open-drain output (per MAX16021 variant); requires external pullup - compatible with mixed-voltage µP I/O domains. |
| BATTOK (Pin 7) | Battery-OK status indicator | Asserts low when VBATT < 2.508V - enables system-level battery health monitoring without ADC polling. |
| BATTON (Pin 8) | Active-high battery-on indicator | Goes high only during valid battery-backup mode - confirms switchover completion for firmware state tracking. |
| WDO (Pin 9) | Active-low watchdog output | Independent of RESET; asserts on watchdog timeout - allows separate handling of firmware hangs vs. power faults. |
| PFO (Pin 10) | Active-low power-fail output | Complements PFI input; asserts when monitored rail falls below VPFT - drives interrupt or LED without µP intervention. |
| GND (Pin 11) | Ground reference | Primary return path; EP pad must be soldered to large ground plane for thermal and EMI performance. |
| RESET (Pin 12) | Active-low reset output | Dual-function pin: open-drain (MAX16021) - supports wired-OR reset bus configurations in multi-IC systems. |
| OUT (Pin 13) | Switched output | Delivers regulated VCC or BATT to memory; bypassed with ≥0.1µF capacitor - serves as clean power rail for SRAM/RTC. |
| CEOUT (Pin 14) | Active-low chip-enable output | Drives memory CE pin; held low for 12µs after reset - prevents partial writes during brownout-induced µP instability. |
| CEIN (Pin 15) | Chip-enable input | Passes CE signal to CEOUT during normal operation; isolated during reset - eliminates need for external logic gates. |
| VCC (Pin 16) | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry and charges internal bias networks - supports wide-input industrial power rails. |
Key Features
| Feature | Design Value |
|---|---|
| Battery-freshness seal | Prevents premature battery discharge during storage via ultra-low leakage (<20nA at VBATT = 5.5V) - extends shelf life of battery-backed modules. |
| On-board CE gating with 1.5ns propagation | Eliminates external gating logic and reduces PCB area; 12µs hold time ensures memory write completion before isolation. |
| UL®-certified IEC 60950-1 compliance | Validated safety certification for end-equipment - removes need for system-level safety requalification in industrial/POS designs. |
| Debounced manual reset input | Internal 100ns glitch immunity and 30kΩ pullup enable direct pushbutton connection - no external RC network required. |
| Low-line indicator (LL) | Provides 2.5% voltage margin above reset threshold - enables nonmaskable interrupt for graceful shutdown before data loss occurs. |
| 1.2µA typical supply current | Reduces quiescent power draw in always-on applications - supports >10-year battery life in RTC/SRAM backup with CR2032. |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
|
Use Scenario: Maintaining accurate timekeeping during AC power loss in smart meters or industrial controllers. IC Role / Device Role / Timing Role: Supervisory IC providing seamless VCC-to-BATT switchover, BATTON confirmation, and BATTOK health monitoring. Use Value: Ensures uninterrupted RTC operation with <0.55µA battery standby current and automatic switchover at 0mV hysteresis. |
Use Scenario: Preventing data corruption in battery-backed SRAM during brownout in GPS loggers or medical devices. IC Role / Device Role / Timing Role: Active CE gating controller that disables memory access within 1.5ns of fault detection and holds CEOUT low for 12µs. Use Value: Guarantees atomic memory writes by isolating CE during reset - eliminates need for external latch or FPGA logic. |
| Industrial Point-of-Sale Terminal | Portable Data Logger |
|
Use Scenario: Reliable boot sequencing and power-fail response in retail terminals with flash memory and touchscreen controllers. IC Role / Device Role / Timing Role: Multi-function supervisor delivering reset, watchdog, PFO, and LL outputs to coordinate firmware recovery and hardware shutdown. Use Value: Reduces BOM count by integrating five discrete supervisory functions into one UL-certified TQFN-16 package. |
Use Scenario: Long-term field deployment of environmental sensors powered by primary battery with optional backup cell. IC Role / Device Role / Timing Role: Low-power system monitor enabling 10+ year operation via 0.25µA battery-backup current and periodic BATT_TEST pulses. Use Value: Self-testing battery health every 24 hours (1.3s pulse) with automatic BATTOK deassertion if VBATT < 2.6V - no host MCU polling needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEM+ | Identical pinout and package; differs only in RESET polarity (active-high on Pin 6, active-low on Pin 12) - MAX16021 adds dual RESET outputs. | Preferred where single active-high reset is sufficient and space-constrained designs require identical footprint compatibility. | Select MAX16020PTEM+ when dual-reset capability is unnecessary and cost optimization is prioritized. |
| TPS3808G33DBVR | Single-supply reset IC (3.3V fixed threshold); no battery switchover, CE gating, or BATTOK/BATTON outputs - lacks 5 of 7 core MAX16021 functions. | Suitable only for basic reset supervision in non-battery-backed systems; cannot replace MAX16021 in RTC/SRAM backup roles. | Choose TPS3808G33DBVR only for simple 3.3V power monitoring where battery management and memory protection are handled externally. |
Compared with MAX16020PTEM+, MAX16021PTEM+ adds a dedicated active-high RESET output (Pin 6) for flexible µP interface design, while TPS3808G33DBVR omits battery control entirely - making MAX16021PTEM+ irreplaceable in applications requiring integrated backup power handoff and CE gating.
Availability
MAX16021PTEM+ is available at Aetrix Electronics and suitable for real-time clock backup, CMOS SRAM write protection, industrial point-of-sale terminals, portable data loggers, and GPS systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16021PTEM+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX160xx family was designed specifically for µP-based systems needing integrated power supervision, battery backup control, and memory write protection - targeting applications where reliability, low quiescent current, and small footprint are critical.
FAQ
What is the reset threshold voltage range for MAX16021PTEM+?
The MAX16021PTEM+ offers factory-programmed reset thresholds ranging from 2.260V (suffix Z) to 4.852V (suffix L), as specified in Table 1b of the datasheet. These thresholds are fixed per part number and cover standard supply rails including 1.8V, 2.5V, 3.0V, 3.3V, and 5.0V - no external resistor network is required for adjustment.
Does MAX16021PTEM+ support both VCC and battery power sources simultaneously?
No - MAX16021PTEM+ implements automatic switchover: OUT connects to VCC during normal operation and switches to BATT only when VCC falls below the reset threshold *and* VBATT > VCC. The device does not power up from BATT alone at startup; VCC must be present first to initialize internal circuitry.
How does the CE gating function work in MAX16021PTEM+?
In MAX16021PTEM+, CEIN passes directly to CEOUT during normal operation via a low-on-resistance transmission gate. When reset asserts, CEOUT is held low for 12µs (typ) if CEIN was low, then pulled high to OUT. If CEIN is high at reset assertion, CEOUT remains high - preventing spurious memory writes during brownout recovery.
What is the purpose of the BATT_TEST pin on MAX16021PTEM+?
The BATT_TEST pin (Pin 6) on MAX16021PTEM+ pulses low for 1.3 seconds every 24 hours to activate an external load for battery voltage testing. This self-test mechanism verifies battery health without host MCU intervention, and BATTOK deasserts if VBATT drops below 2.508V during the test - enabling predictive maintenance in unattended deployments.
Is MAX16021PTEM+ RoHS-compliant and lead-free?
Yes - the "+" suffix in MAX16021PTEM+ explicitly denotes a lead(Pb)-free and RoHS-compliant package per Maxim's ordering information. The TQFN-EP package meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for reflow soldering at +240°C peak temperature.
MAX16021PTEM+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.428V
- 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)
MAX16021PTEM+ FAQ
1.How can I place an order for MAX16021PTEM+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEM+ 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 MAX16021PTEM+ reliable?
The price and inventory of MAX16021PTEM+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEM+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTEM+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEM+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEM+?
MAX16021PTEM+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEM+ 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 MAX16021PTEM+?
For technical support, including MAX16021PTEM+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEM+ requirements.
6.How does Aetrix verify that MAX16021PTEM+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEM+ 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 MAX16021PTEM+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTEM+?
All MAX16021PTEM+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEM+, 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 MAX16021PTEM+ part is unused and in its original packaging.
Return procedure for MAX16021PTEM+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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