My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX16021PTEY+
- Part No.:
- MAX16021PTEY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16021PTEY+.pdf
- Description:
- IC SUPERVISOR OD 2.192V 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,936
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX16021PTEY+ 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, 2.19V fixed reset threshold (suffix Y), 145ms minimum reset timeout, and operates from 1.53V to 5.5V supply. Used in RTC and SRAM backup systems where data retention during main power loss is critical.
For engineers reviewing the MAX16021PTEY+ datasheet, MAX16021PTEY+ pinout, MAX16021PTEY+ application, or MAX16021PTEY+ equivalent, key selection considerations include its 16-pin TQFN package, open-drain reset output (suffix P), CEIN/CEOUT propagation delay of 1.5ns, battery-OK (BATTOK) and battery-on (BATTON) indicators, and support for 2.19V system monitoring with early low-line warning (LL).
Technical Context
The MAX16021PTEY+ integrates four core supervisory functions: µP reset generation during VCC brownout/power-down, automatic VCC-to-battery switchover when VCC falls below VBATT and reset threshold, internal CE signal gating to prevent memory corruption during fault conditions, and power-fail detection down to 0.6V via PFI comparator with 30mV hysteresis.
Its architecture includes a watchdog timer (1.2s typical timeout), debounced manual reset input (MR) with 30kΩ internal pullup, battery freshness seal, and dual-mode operation-normal mode with VCC powering OUT, and battery-backup mode where BATT powers OUT while asserting BATTON and deasserting BATTOK if VBATT < 2.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V (typical), fixed threshold for 2.2V-class systems; ensures reliable reset assertion before logic failure |
| Reset Timeout Period | 145ms (min), guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current | 5µA (typ at VCC = 5.5V), enables ultra-low-power operation in always-on monitoring applications |
| Battery-Backup Current | 0.25µA (typ at VCC = 0V), minimizes battery drain during extended backup periods |
| CEIN to CEOUT Propagation Delay | 1.5ns (typ), supports high-speed µP/DSP interfaces without timing violation in CE-gated memory access |
| Power-Fail Input Threshold | 0.590V (typ), allows precise low-voltage monitoring of auxiliary rails or scaled-down supplies |
| Operating Temperature Range | -40°C to +85°C, qualified for industrial and embedded environments without derating |
Pinout & Package
MAX16021PTEY+ 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 under continuous load without external heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Backup battery input | Connects to backup cell; enables automatic switchover to battery when VCC drops below reset threshold and VBATT > VCC |
| MR | Active-low manual reset input | Asserts reset on logic-low transition; includes 30kΩ internal pullup to VCC; debounced internally |
| PFI | Power-fail comparator input | Monitors auxiliary voltage via resistive divider; referenced to 0.590V internal threshold with 30mV hysteresis |
| WDI | Watchdog timer input | Clears watchdog on rising/falling edge; timeout triggers WDO assertion if no transition occurs within 1.2s (typ) |
| LL | Active-low low-line output | Asserts ~2.5% above reset threshold (≈2.24V) to provide early warning NMI before reset activation |
| 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 discharge |
| BATTOK | Battery-OK status indicator | Deasserts low when VBATT < 2.6V; signals end-of-life or weak battery condition in backup mode |
| BATTON | Active-high battery-on indicator | Asserts high only when device is actively sourcing from BATT - confirms valid backup operation |
| WDO | Active-low watchdog output | Independent of RESET; asserts on watchdog timeout and clears on next WDI edge or reset assertion |
| PFO | Active-low power-fail output | Asserts when PFI input falls below 0.590V; provides system-level power-fail interrupt independent of reset state |
| GND | Ground reference | Primary return path; EP must be soldered to large ground plane for thermal and noise performance |
| RESET | Active-low reset output | Open-drain configuration (suffix P); requires external pullup; asserts during VCC brownout, MR low, or WDI timeout |
| OUT | Switched output | Connects to VCC or BATT based on switchover logic; powers SRAM/RTC; bypass with ≥0.1µF capacitor |
| CEOUT | Active-low chip-enable output | Gated version of CEIN; disabled during reset to prevent memory write corruption; pulled up to OUT |
| CEIN | Chip-enable input | Directly drives CEOUT during normal operation; high-impedance when reset asserted; connect to GND or OUT if unused |
| VCC | Main supply input | Accepts 1.53V–5.5V; powers internal circuitry; bypass with 0.1µF capacitor to GND near pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CE gating with 1.5ns propagation delay | Prevents erroneous memory writes during brownout by disabling CE path within nanoseconds of reset assertion |
| Battery-freshness seal | Reduces BATT leakage to ≤20nA at 5.5V, preserving shelf life of backup cells prior to first use |
| Dual reset outputs (RESET + WDO) | Enables independent reset handling and watchdog supervision - e.g., WDO triggers firmware recovery while RESET holds µP in reset |
| Low-line (LL) early-warning comparator | Asserts at 2.24V (2.5% above 2.19V threshold), giving µP ≥120µs to initiate graceful shutdown before reset |
| Battery test pulse (BATT_TEST) | Automated 1.3s periodic discharge pulse enables non-intrusive battery voltage validation without user intervention |
| UL® certification per IEC 60950-1 | Validates safety compliance for industrial and commercial end equipment requiring regulatory approval |
Applications
| Real-Time Clock (RTC) Backup | CMOS SRAM Write Protection |
|---|---|
Use Scenario: Maintaining accurate timekeeping and calendar data in GPS modules during vehicle ignition-off periods. IC Role / Device Role / Timing Role: Supervisory controller that switches RTC power source from VCC to backup battery and asserts BATTON to enable low-power RTC operation. Use Value: Guarantees uninterrupted RTC operation for >10 years on CR2032 using 0.25µA battery-backup current. |
Use Scenario: Preventing data corruption in point-of-sale terminals during AC power interruption or brownout events. IC Role / Device Role / Timing Role: CE gate controller that disables memory write access within 12µs of reset assertion while maintaining read capability. Use Value: Eliminates need for external logic or FPGA-based write-protection schemes, reducing BOM count and PCB area. |
| Industrial Control Panel Power Monitoring | Portable Medical Device Power Sequencing |
Use Scenario: Detecting gradual mains voltage sag in factory HMIs to trigger controlled shutdown before control logic fails. IC Role / Device Role / Timing Role: Dual-threshold monitor providing LL early warning (2.24V) followed by RESET (2.19V) with 145ms timeout. Use Value: Enables deterministic firmware response window (≥120µs) for saving process state before hard reset. |
Use Scenario: Ensuring safe power sequencing in handheld ultrasound devices during battery swap or low-voltage conditions. IC Role / Device Role / Timing Role: Coordinated supervisor managing VCC switchover, battery health check (BATTOK/BATT_TEST), and watchdog-triggered recovery. Use Value: Meets IEC 62304 Class C software safety requirements by preventing inconsistent memory states during power transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16020PTEY+ | Identical pinout, same reset threshold (2.19V), but lacks BATT_TEST output; uses RESET (active-high) instead of MAX16021's dual RESET/RESET outputs | No automated battery health verification; suitable where manual battery replacement schedule suffices | Select MAX16020PTEY+ when BATT_TEST functionality is unnecessary and active-high reset signaling aligns with µP interface requirements |
| TPS3808G33DBVR | Single-supply supervisor only (no battery switchover, no CE gating, no BATTOK/BATTON); 3.3V fixed reset; SOT-23-6 package | Limited to basic reset generation - cannot replace MAX16021PTEY+ in battery-backed memory or RTC applications | Choose TPS3808G33DBVR only for cost-sensitive, non-backup applications requiring minimal footprint and simple reset assertion |
Compared with MAX16020PTEY+, MAX16021PTEY+ adds autonomous battery testing and dual-reset signaling flexibility; versus TPS3808G33DBVR, it delivers full power-management integration - switchover, CE protection, and multi-indicator status - eliminating 3–4 discrete components in backup-critical designs.
Availability
MAX16021PTEY+ is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, GPS navigation units, and point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX16021PTEY+ 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 requiring robust power supervision, seamless battery backup, and memory write protection - targeting applications where data integrity during power faults is non-negotiable.
FAQ
What is the reset threshold voltage of MAX16021PTEY+?
The MAX16021PTEY+ has a fixed reset threshold of 2.19V (typical), with min/max values of 2.117V and 2.288V respectively. This threshold is factory-trimmed and stable over temperature (±0.5% variation from -40°C to +85°C), making it suitable for monitoring 2.2V nominal supply rails in industrial and portable equipment where precise brownout detection is required.
Does MAX16021PTEY+ support both VCC and battery power sources simultaneously?
No - MAX16021PTEY+ implements automatic single-source selection: OUT connects to VCC during normal operation, and switches to BATT only when VCC falls below both the reset threshold (2.19V) and VBATT. The device does not parallel or sum the supplies; it acts as a seamless, low-loss power mux with <5.5Ω on-resistance and sub-µA quiescent current in backup mode.
How does the CE gating function protect memory in MAX16021PTEY+?
In MAX16021PTEY+, CE gating disables the CEIN-to-CEOUT path within 12µs of reset assertion. If CEIN is low when reset triggers, CEOUT remains low for 12µs to complete any ongoing memory access, then goes high and stays high - blocking further writes. This prevents partial writes and bus contention during power faults, ensuring SRAM data integrity without external logic.
What is the purpose of the BATT_TEST pin on MAX16021PTEY+?
The BATT_TEST pin on MAX16021PTEY+ outputs a 1.3s open-drain low pulse every 24 hours to activate an external test load (e.g., 10kΩ resistor). This draws temporary current to measure actual battery voltage under load, detecting weak cells before they fail in backup mode - a feature absent in MAX16020PTEY+ and critical for unattended medical or infrastructure applications.
Can MAX16021PTEY+ operate with a 1.8V main supply?
Yes - MAX16021PTEY+ supports VCC from 1.53V to 5.5V and is fully specified down to 1.53V. At 1.8V, it maintains all functions including reset generation (2.19V threshold is not active, but internal regulation ensures proper comparator biasing), CE gating (1.5ns delay preserved), and battery switchover - though VCC must exceed VBATT by >1% to remain connected to OUT.
MAX16021PTEY+ 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:
- 2.192V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High/Active Low
- Reset Timeout:
- 145ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (4x4)
MAX16021PTEY+ FAQ
1.How can I place an order for MAX16021PTEY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16021PTEY+ 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 MAX16021PTEY+ reliable?
The price and inventory of MAX16021PTEY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16021PTEY+ is usually 5 days.
3.What payment methods are accepted for MAX16021PTEY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16021PTEY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16021PTEY+?
MAX16021PTEY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16021PTEY+ 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 MAX16021PTEY+?
For technical support, including MAX16021PTEY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16021PTEY+ requirements.
6.How does Aetrix verify that MAX16021PTEY+ is sourced from the original manufacturer or authorized distributors?
All MAX16021PTEY+ 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 MAX16021PTEY+ meets industry standards.
7.What is the process for return or replacement of MAX16021PTEY+?
All MAX16021PTEY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16021PTEY+, 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 MAX16021PTEY+ part is unused and in its original packaging.
Return procedure for MAX16021PTEY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX16021PTEY+ 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…
