My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX817LCPA+
- Part No.:
- MAX817LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX817LCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX817LCPA+ from Maxim Integrated is a +5V microprocessor supervisory circuit with active-low reset, backup-battery switchover, and power-fail comparator functionality. It features a 4.65V ±5% reset threshold, 200ms reset timeout, 11µA quiescent supply current, and operates in 0°C to +70°C temperature range. Designed for critical µP monitoring in portable battery-powered systems, it ensures reliable reset assertion during power-up, brownout, and power-down events.
For engineers reviewing the MAX817LCPA+ datasheet, MAX817LCPA+ pinout, MAX817LCPA+ application, or MAX817LCPA+ equivalent, this device serves as a precision voltage monitor and system supervisor in embedded controllers, intelligent instruments, and portable equipment where low-power operation and battery backup integrity are essential.
Technical Context
The MAX817LCPA+ integrates a precision reset comparator with 4.65V threshold and 25mV hysteresis, a 200ms internal reset timer, and a dedicated power-fail comparator (PFI/PFO) with 1.25V threshold. Its battery switchover circuit uses dual PMOS switches (5Ω VCC-to-OUT, 80Ω BATT-to-OUT) to maintain RAM supply during VCC drop below both VRST and VBATT.
It supports battery freshness seal activation via PFO latching during power cycling and ignores fast transients on VCC due to internal filtering. Unlike MAX818/MAX819 variants, it lacks watchdog input and manual reset - confirmed by Selector Guide and Pin Description tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±5% - triggers active-low RESET when VCC falls below this level, ensuring µP reset before brownout corruption |
| Reset Timeout Period | 200ms typical - guarantees minimum reset pulse width after VCC recovery, meeting most µP tRST requirements |
| Supply Current | 11µA typical at +25°C - enables multi-year battery life in portable applications with no load |
| VCC Operating Range | +4.75V to +5.5V - compatible with standard +5V regulated supplies and tolerates 5% line variation |
| Battery Switchover | Enables automatic OUT switching from VCC to BATT when VCC < VRST and VCC < VBATT - preserves CMOS RAM data during power loss |
| Power-Fail Comparator | 1.25V PFI threshold with 4mV hysteresis - provides independent undervoltage warning for secondary supplies or low-battery detection |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and industrial control panels |
Pinout & Package
MAX817LCPA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), pin-compatible with 8-pin SO and DIP variants. The µMAX package supports high-density PCB layouts and offers thermal performance suitable for battery-powered portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC and BATT based on voltage comparison; delivers up to 250mA with <5Ω on-resistance from VCC |
| 2 VCC | Main +5V supply input | Primary power source; powers internal circuitry and drives OUT when above reset threshold and VBATT |
| 3 GND | Ground reference | 0V return path for all analog and digital functions; must be low-impedance for accurate reset threshold sensing |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V - used for secondary supply monitoring |
| 5 PFO | Power-fail comparator output | Open-drain output pulled high externally; signals power-fail condition and enables battery freshness seal when grounded |
| 6 WDI | Watchdog input | No functional connection in MAX817 - unused pin; must be left open or tied to VCC/GND per datasheet guidance |
| 7 RESET | Active-low reset output | Drives µP reset pin low for ≥200ms during power-up/brownout; sinks 3.2mA minimum at 0.4V |
| 8 BATT | Backup battery input | Accepts 2.0V–6.0V battery or SuperCap; powers OUT and internal circuitry when VCC fails |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V reset threshold | ±5% tolerance over temperature ensures consistent brownout protection without external resistor trimming |
| 200ms reset timeout | Internally generated delay meets JEDEC JESD8-12B µP reset timing requirements without external RC components |
| 11µA supply current | Enables >10-year shelf life in battery-backed memory systems with typical 20mAh coin cell |
| Independent power-fail comparator | 1.25V reference allows monitoring of auxiliary rails (e.g., +3.3V, +2.5V) without affecting primary reset function |
| Battery freshness seal | Disables BATT leakage (<1nA at +25°C) until first power cycle, preserving battery capacity during storage and shipment |
Applications
| Embedded Controllers | Intelligent Instruments |
|---|---|
Use Scenario: Industrial PLCs and remote telemetry units requiring nonvolatile RAM retention during AC mains interruption. IC Role / Device Role / Timing Role: Supervisory circuit providing active-low RESET signal and seamless BATT-to-OUT switchover within 10µs of VCC collapse. Use Value: Prevents RAM corruption and system lockup by guaranteeing µP reset before supply decay reaches critical levels. |
Use Scenario: Handheld multimeters and portable oscilloscopes needing persistent calibration data across battery swaps. IC Role / Device Role / Timing Role: Voltage monitor and backup power switcher maintaining VOUT at ≥2.8V while VCC drops from 5.0V to 0V. Use Value: Eliminates need for external diode-OR circuits and reduces BOM count by integrating switchover logic and reset timing. |
| Battery-Powered Computers | Critical µP Monitoring |
Use Scenario: Ruggedized tablets and medical data loggers operating on Li-ion packs with variable discharge profiles. IC Role / Device Role / Timing Role: Dual-function supervisor asserting RESET when VCC falls below 4.65V and enabling PFO-based low-battery warning. Use Value: Provides deterministic reset behavior across full battery voltage range (4.2V–3.0V) without software intervention. |
Use Scenario: Aerospace avionics modules where µP must never execute invalid code during transient supply disturbances. IC Role / Device Role / Timing Role: Precision reset generator with 25mV hysteresis rejecting noise spikes up to 100µs duration per Figure 11. Use Value: Guarantees reset assertion only during genuine brownouts - avoids false resets from EMI or switching noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690ACPA+ | 4.65V reset threshold, 200ms timeout, but no power-fail comparator or battery switchover; higher 25µA supply current | Lacks BATT support and PFI/PFO - suitable only for basic reset-only applications without backup power needs | Select when cost sensitivity outweighs feature requirements and battery backup is handled externally |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 200ms timeout, 1.6µA supply current, but no BATT pin or power-fail comparator | Designed for 3.3V systems only; incompatible with +5V VCC operation and battery switchover architecture | Choose only for new 3.3V designs where ultra-low quiescent current is prioritized over multi-rail supervision |
Compared with MAX690ACPA+ and TPS3808G33DBVR, the MAX817LCPA+ uniquely combines +5V supervision, battery switchover, and independent power-fail detection in a single µMAX package - making it irreplaceable for portable systems requiring RAM backup and auxiliary rail monitoring.
Availability
MAX817LCPA+ is available at Aetrix Electronics and suitable for embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX817LCPA+ 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, communications, and computing markets.
The MAX817LCPA+ belongs to Maxim's microprocessor supervisory product line, designed specifically to replace discrete reset generators and battery backup circuits in space-constrained, low-power +5V systems.
FAQ
What is the reset threshold voltage of the MAX817LCPA+?
The MAX817LCPA+ has a factory-trimmed reset threshold of 4.65V with ±5% tolerance over temperature. This value is specified in the Electrical Characteristics table under "VRST" and applies across the full 0°C to +70°C operating range. The L suffix explicitly denotes the 4.65V version, distinguishing it from the 4.40V M variant. The MAX817LCPA+ uses this threshold to assert active-low RESET whenever VCC falls below this level, ensuring µP initialization before brownout conditions cause erratic behavior.
Does the MAX817LCPA+ support watchdog timer functionality?
No, the MAX817LCPA+ does not include watchdog timer functionality. According to the Selector Guide and Functional Diagram, watchdog input (WDI) is present on the die but not enabled in the MAX817 variant - it is reserved for MAX818/MAX819. The WDI pin (Pin 6) is unused and must be left open or tied to VCC/GND per datasheet recommendations. For watchdog capability, engineers must select MAX818LCPA+ or MAX819LCPA+ instead.
How does the battery freshness seal work on the MAX817LCPA+?
The battery freshness seal on the MAX817LCPA+ disconnects the BATT pin from internal circuitry until first power-up, reducing standby leakage to <1nA. Activation requires grounding PFO during a specific power-cycle sequence: apply VCC above 4.65V, wait for RESET deassertion, then cycle VCC down. Once enabled, the seal remains active until VCC exceeds VRST again. This ensures maximum shelf life for backup batteries in shipped products - a key requirement for medical and industrial field-deployed equipment using the MAX817LCPA+.
Can the MAX817LCPA+ monitor a secondary voltage rail like +3.3V?
Yes, the MAX817LCPA+ can monitor secondary rails using its dedicated power-fail comparator. Connect a resistive divider from the +3.3V rail to PFI so that the divided voltage equals 1.25V at the trip point (e.g., R1 = 16.5kΩ, R2 = 10kΩ). When the monitored rail drops, PFI falls below 1.25V and PFO pulls low - providing a clean, isolated warning signal. This function operates independently of the main reset circuit, allowing simultaneous supervision of VCC and auxiliary supplies without interaction - a verified capability documented in Figure 8 and Applications Information section of the MAX817LCPA+ datasheet.
What package type is used for the MAX817LCPA+?
The MAX817LCPA+ uses the 8-pin µMAX package (3mm × 3mm, 0.8mm height), identified by the "UA" suffix in Maxim's ordering nomenclature. This thermally enhanced, surface-mount package is pin-compatible with 8-pin SO and DIP variants but offers superior power density and solder-reflow compatibility for high-volume portable electronics manufacturing. The "+" in the part number confirms lead-free finish per JEDEC J-STD-609, and the C grade indicates 0°C to +70°C operation - all confirmed in the Ordering Information table on page 1 of the MAX817LCPA+ datasheet.
MAX817LCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX817LCPA+ FAQ
1.How can I place an order for MAX817LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX817LCPA+ 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 MAX817LCPA+ reliable?
The price and inventory of MAX817LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX817LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX817LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX817LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX817LCPA+?
MAX817LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX817LCPA+ 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 MAX817LCPA+?
For technical support, including MAX817LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX817LCPA+ requirements.
6.How does Aetrix verify that MAX817LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX817LCPA+ 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 MAX817LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX817LCPA+?
All MAX817LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX817LCPA+, 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 MAX817LCPA+ part is unused and in its original packaging.
Return procedure for MAX817LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX817LCPA+ 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…
