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Analog Devices Inc./Maxim Integrated MAX708CPA
- Part No.:
- MAX708CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX708CPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,535
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Product details
Overview
The MAX708CPA from Maxim Integrated is an 8-pin DIP microprocessor supervisory circuit providing active-high reset output, power-fail warning, manual-reset input, and brownout detection at 4.40V threshold for +5V systems. It guarantees RESET validity down to VCC = 1V, delivers a 200ms reset pulse width, and supports TTL/CMOS-compatible debounced manual reset - used in embedded controllers and industrial instrumentation for reliable power-up sequencing and fault recovery.
For engineers reviewing the MAX708CPA datasheet, MAX708CPA pinout, MAX708CPA application, or MAX708CPA equivalent, key selection criteria include its 4.40V reset threshold, active-high RESET output (not active-low), absence of watchdog timer, and compatibility with 0°C to +70°C commercial temperature operation in plastic DIP packaging.
Technical Context
The MAX708CPA implements a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis to detect brownout conditions on the +5V supply rail. Its internal timing generator ensures a guaranteed 200ms reset pulse width after VCC rises above threshold or MR release.
Unlike the MAX705/MAX706 series, the MAX708CPA omits the watchdog timer and WDI/WDO pins, instead dedicating pins to dual reset outputs (RESET and RESET) and power-fail comparator (PFI/PFO). The PFI input accepts 1.25V threshold detection for external power-fail or low-battery monitoring independent of VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when +5V supply drops below this level, optimized for systems requiring tighter tolerance than 4.65V variants |
| Reset Pulse Width | 200ms nominal - ensures sufficient duration to fully initialize microprocessors like Intel 80C51 or Motorola 68HC11 |
| Supply Voltage Range | 1.0V to 5.5V - guarantees RESET output validity even during deep brownout down to 1V, enabling fail-safe state retention |
| Supply Current | 50µA typical - ultra-low quiescent current preserves battery life in backup-supply or portable applications |
| Power-Fail Input Threshold | 1.25V ±50mV - enables precise early-warning detection of failing supplies or depleted batteries via external resistor divider |
| Manual-Reset Input Threshold | 0.8V low / 2.0V high - TTL/CMOS-compatible with 250µA internal pull-up, allowing direct switch or logic-level triggering |
| Operating Temperature | 0°C to +70°C - commercial-grade rating suitable for office equipment, consumer controllers, and non-automotive embedded systems |
Pinout & Package
MAX708CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead or RoHS-compliant (add '+' suffix for lead-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Triggers 200ms reset pulse when pulled below 0.8V; internally pulled up with 250µA - eliminates need for external pull-up resistor |
| 2 VCC | +5V supply input | Primary power rail; device operates from 1.0V to 5.5V and guarantees RESET functionality down to VCC = 1V |
| 3 GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to avoid noise-induced false resets |
| 4 PFI | Power-fail input | Monitors external voltage via 1.25V comparator; asserts PFO low when input falls below threshold - used for battery-low or AC-loss detection |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; requires external pull-up to generate interrupt or flag signal to microcontroller |
| 6 N.C. | No connect | Unbonded pin - must remain unconnected per datasheet; no internal circuitry attached |
| 7 RESET | Active-high reset output | Complementary to RESET; goes high when VCC > 4.40V and reset timeout completes - required for µPs with active-high reset inputs (e.g., 80C51) |
| 8 RESET | Active-low reset output | Standard open-drain reset signal; pulled low during power-up, brownout, or MR assertion - compatible with most legacy µP reset inputs |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables robust reset assertion during deep undervoltage events, preventing processor runaway before full power collapse |
| 200ms reset pulse width | Meets or exceeds minimum reset hold time requirements of industry-standard microcontrollers including ARM Cortex-M0 and PIC16F |
| Debounced TTL/CMOS-compatible MR input | Eliminates need for external RC debounce network; 140–280ms internal delay prevents contact bounce from causing spurious resets |
| Precision 4.40V reset threshold | Optimized for +5V systems with tighter regulation margins than 4.65V parts - reduces risk of premature reset during transient dips |
| 1.25V power-fail comparator | Supports flexible monitoring of auxiliary rails (e.g., +12V, -5V, or battery) using external resistive dividers without additional ICs |
Applications
| Industrial Controller Monitoring | Embedded Instrumentation |
|---|---|
Use Scenario: PLC I/O modules powered from regulated +5V with backup battery and AC mains supervision. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM-based controller during brownout, while PFO signals AC loss to initiate graceful shutdown. Use Value: Prevents corrupted EEPROM writes and firmware lockup by guaranteeing 200ms reset hold time and detecting supply degradation 100ms before VCC crosses 4.40V. |
Use Scenario: Portable multimeter with lithium coin-cell backup and dual-voltage analog front-end (+5V digital, +12V analog). IC Role / Device Role / Timing Role: MAX708CPA monitors both rails: VCC for main reset, PFI for battery voltage decay detection via resistor divider. Use Value: Enables low-battery warning and automatic save-to-flash before shutdown, leveraging 1.25V comparator accuracy and sub-100nA PFI input leakage. |
| Medical Diagnostic Equipment | Point-of-Sale Terminal |
Use Scenario: Ultrasound imaging subsystem requiring deterministic boot sequence and fault logging upon power anomaly. IC Role / Device Role / Timing Role: Generates synchronized active-high RESET and PFO interrupt to FPGA and microcontroller during cold start or line sag. Use Value: Ensures consistent initialization across multiple ASICs and memory banks, eliminating race conditions caused by marginal VCC ramp rates. |
Use Scenario: Retail terminal with USB host controller, thermal printer, and smart card reader sharing a single +5V SMPS. IC Role / Device Role / Timing Role: Provides system-wide reset coordination and detects undervoltage on +5V rail before data corruption occurs in flash storage. Use Value: Reduces field returns due to boot failures by enforcing 200ms reset pulse and validating VCC ≥4.40V prior to firmware execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CPA | Same 8-pin DIP package and 4.40V reset threshold, but provides active-low RESET only (no RESET) | Requires µP with active-low reset input; lacks complementary reset output needed for 80C51-class devices | Select MAX706CPA only if system design uses active-low reset and does not require simultaneous high/low assertion |
| MAX708CSA | Identical electrical specs and pinout, but in 8-pin SO surface-mount package instead of DIP | Designed for automated PCB assembly; same thermal and electrical performance, but incompatible with through-hole layouts | Choose MAX708CSA for volume production with reflow soldering; use MAX708CPA for prototyping, repair, or wave-soldered boards |
Compared with MAX706CPA and MAX708CSA, the MAX708CPA uniquely combines active-high and active-low reset outputs in a through-hole DIP package - making it the only option supporting bidirectional reset signaling in hand-soldered or legacy industrial control designs.
Availability
MAX708CPA is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, medical diagnostic equipment, and point-of-sale terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX708CPA 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 MAX705–MAX708/MAX813L family was designed to replace discrete reset generators and voltage monitors in microprocessor systems - delivering integrated supervision with guaranteed timing, low power, and wide supply range in compact packages.
FAQ
What is the reset threshold voltage of the MAX708CPA?
The MAX708CPA has a nominal reset threshold of 4.40V with ±150mV tolerance over temperature and supply variation. This value is factory-trimmed and specified across the full 0°C to +70°C operating range. The MAX708CPA uses this threshold to assert both RESET and RESET outputs whenever VCC drops below 4.40V, ensuring deterministic behavior during brownout conditions.
Does the MAX708CPA include a watchdog timer function?
No, the MAX708CPA does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L variants, the MAX708CPA omits the WDI and WDO pins and associated circuitry. Its function set is limited to power-supply monitoring, manual reset, and power-fail warning - making it suitable for applications where watchdog supervision is handled externally or not required.
Can the MAX708CPA operate with supply voltages below 4.40V?
Yes, the MAX708CPA operates from 1.0V to 5.5V and guarantees valid RESET output down to VCC = 1V. While reset assertion occurs at 4.40V, the device continues to function - maintaining PFO state and responding to MR - until VCC falls below 1.0V. This allows safe system shutdown sequencing even during deep brownout events.
What is the purpose of the N.C. pin on the MAX708CPA?
Pin 6 of the MAX708CPA is designated N.C. (No Connect) and contains no internal bond wire or circuitry. It must remain unconnected in PCB layout and schematic design. Connecting this pin may cause unpredictable behavior or damage, as confirmed in the official Maxim Integrated datasheet revision 11 (July 2018).
How does the MAX708CPA handle power-fail detection?
The MAX708CPA uses its PFI input to monitor external voltages against a precise 1.25V internal reference. When the voltage at PFI falls below 1.25V, the open-drain PFO output pulls low. This allows detection of failing backup batteries, degraded AC adapters, or secondary supply rails - independent of the main VCC supply monitored for reset generation.
MAX708CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX708CPA FAQ
1.How can I place an order for MAX708CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CPA 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 MAX708CPA reliable?
The price and inventory of MAX708CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CPA is usually 5 days.
3.What payment methods are accepted for MAX708CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CPA?
MAX708CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CPA 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 MAX708CPA?
For technical support, including MAX708CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CPA requirements.
6.How does Aetrix verify that MAX708CPA is sourced from the original manufacturer or authorized distributors?
All MAX708CPA 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 MAX708CPA meets industry standards.
7.What is the process for return or replacement of MAX708CPA?
All MAX708CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CPA, 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 MAX708CPA part is unused and in its original packaging.
Return procedure for MAX708CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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