Maxim MAX708

Mfr. Part

MAX708

Manufacturer

Analog Devices / Maxim Integrated

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Detailed Description

MAX708 is a 5 V microprocessor supervisory IC. It monitors the system supply, issues a reliable reset during power-up, power-down, and brownout, includes a watchdog timer to catch locked-up software, offers a manual reset input, and provides a power-fail (low-line) comparator with a dedicated output. It helps protect 5 V digital systems with simple, low-power circuitry. Main Category: Integrated Circuits (ICs). Small Classification: Specialized ICs. Package: DIP-8 through-hole.

Key Features

Power supply monitor for +5 V systems with fixed reset threshold

Active reset output and complementary output for flexible interfacing

Watchdog timer to detect software faults (WDI pin)

Manual reset input (MR) for user or system-triggered reset

Power-fail comparator input/output (PFI/PFO) for early warning

Low quiescent current for battery and low-power designs

Known-good reset at power-up, power-down, and brownout

Simple 8-pin DIP footprint for easy prototyping and repair

Pin-compatible family with threshold/output variants

Key Advantages

Protects processors and FPGAs from undefined operation during low voltage

Catches firmware hangs automatically with watchdog

Gives early warning of falling supply to allow safe shutdown

Reduces component count versus discrete reset and watchdog circuits

Drop-in 8-pin DIP simplifies maintenance and field service

Proven, widely adopted part with long-term availability

Packaging

Type: Through-hole PDIP-8 (standard 0.300 inch body width)

Case/Code: 8-PDIP, supplier case code 1057

Material: Molded epoxy body, copper leadframe (lead finish varies by RoHS/lead option)

Size (typical PDIP-8): body width ~7.62 mm, pin pitch 2.54 mm, body length ~9.8–10.2 mm

Pin configuration (top view):

1 GND

2 RESET (active-low reset output)

3 MR (manual reset input, active-low)

4 WDI (watchdog input)

5 PFI (power-fail comparator input)

6 PFO (power-fail comparator output)

7 RESET (active-high reset output)

8 VCC (positive supply)

Thermal characteristics (PDIP-8, typical): θJA ~100–130 °C/W in still air. Actual values depend on PCB and airflow.

Electrical properties (high level, see datasheet for exact numbers):

- Intended for +5 V rails (5 V nominal operation)

- Fixed reset threshold suitable for 5 V systems (MAX708 version uses the lower 5 V threshold variant; verify exact value in datasheet)

- Reset pulse width typically hundreds of milliseconds (variant dependent)

- Watchdog timeout on the order of seconds (variant dependent)

- Very low supply current for always-on supervision

Lifecycle

Status: As of the latest update, MAX708 is an active, mainstream product in the Analog Devices / Maxim Integrated portfolio. Not flagged as near end-of-life. Always check current status on our website.

Equivalent or alternative models (verify pin and threshold compatibility before use):

- Same family (Maxim/ADI): MAX705, MAX706, MAX707 (related parts with different reset thresholds or output structures)

- Analog Devices: ADM705, ADM706 (functionally similar supervisors for 5 V systems)

- Texas Instruments: TL7705A, TPS3823/TPS3824/TPS3825/TPS3826 (supervisors and µP monitors; packages and pinouts differ)

- Microchip/Power Trends: MCP120/MCP130 (reset ICs, threshold options), TC1232 (watchdog/reset monitor)

If you need a direct drop-in or different threshold/version, or if you do not see a suitable alternative above, please contact our sales team via the Y-IC website for tailored recommendations.

Key Application Areas

5 V microcontroller and microprocessor systems

Embedded controllers, single-board computers, PLCs

Industrial control and factory automation

Networking, storage, and server peripherals

Telecom and communication equipment

Test and measurement instruments

POS, kiosks, printers, and peripherals

Consumer and white-goods control boards

Automotive modules when used within rated temperature grades

Datasheet

Y-IC hosts the most authoritative datasheet for MAX708 on the product page. We strongly recommend downloading the datasheet on this page for exact thresholds, timing, electrical limits, and pin behaviors.

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