Analog Devices Inc./Maxim Integrated MAX700CSA+

Overview

MAX700CSA+ from Maxim Integrated is a precision power-supply supervisory circuit for +5V microprocessor systems, featuring factory-trimmed 4.65V reset threshold, adjustable voltage detection via SENSE input (1.29V reference), adjustable hysteresis, debounced manual-reset input, and guaranteed valid RESET output down to VCC = 1V. It operates in commercial temperature range (0°C to +70°C) and is used for reliable power-on/power-down reset generation in embedded controllers.

For engineers reviewing the MAX700CSA+ datasheet, MAX700CSA+ pinout, MAX700CSA+ application, or MAX700CSA+ equivalent, key selection criteria include its dual-mode monitoring (VCC or external SENSE), 200ms minimum reset pulse width, ±150mV reset threshold tolerance, 100–200µA supply current, and narrow-SO-8 package compatibility with lead-free assembly.

Technical Context

The MAX700CSA+ implements a dual-threshold comparator architecture with internal 1.29V reference, enabling either direct VCC monitoring (CTL = GND) or externally scaled voltage monitoring (CTL = VCC). Its HYST terminal provides programmable hysteresis by sinking ~1kΩ to GND 5µs before reset assertion.

It delivers active-low RESET and active-high RESET outputs with guaranteed timing: ≥200ms pulse width during power-up, power-down, and brownout events; reset remains asserted until VCC exceeds 4.65V + hysteresis and stabilizes. MR input includes internal 5µA pullup and 0.7V logic threshold.

Key Specifications

Pinout & Package

MAX700CSA+ is housed in an 8-pin narrow-SO (SOIC-8) package with 1.27mm pitch, RoHS-compliant lead-free finish (indicated by '+' suffix), and JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply supervision applications.

Compared with TPS3808G01DBVR and ADM6710ARZ-REEL7, the MAX700CSA+ uniquely combines VCC/SENSE dual-mode monitoring, hardware-debounced MR, and complementary RESET/RESET outputs-enabling robust, flexible reset control in mixed-rail industrial systems without added components.

Availability

MAX700CSA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive infotainment head units, and network router management processors requiring stable component supply across extended production lifecycles.

Supply support for MAX700CSA+ 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, designs high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.

The MAX700 family was engineered specifically for cost-sensitive, high-reliability microprocessor supervision-delivering integrated reset timing, manual reset debouncing, and flexible voltage monitoring in minimal footprint.

FAQ

What is the function of the CTL pin on the MAX700CSA+?

The CTL pin on the MAX700CSA+ selects the voltage monitoring source: when tied to GND, the device monitors VCC directly for a 4.65V threshold; when tied to VCC, it monitors the SENSE pin using an internal 1.29V reference, enabling custom threshold setting via external resistor dividers. This dual-mode capability makes the MAX700CSA+ adaptable to both standard +5V and multi-rail systems without redesign.

Does the MAX700CSA+ require external components to operate with a +5V supply?

No, the MAX700CSA+ requires no external components for basic +5V supervision. Its factory-trimmed 4.65V threshold, internal 1.29V reference, and debounced MR input eliminate the need for trimming resistors, capacitors, or external debounce circuits. Only pullup resistors on RESET (if open-drain) and optional hysteresis resistors on HYST are needed for advanced configurations-making the MAX700CSA+ a true plug-and-play solution for +5V µP systems.

How long is the reset pulse width generated by the MAX700CSA+ during power-up?

The MAX700CSA+ guarantees a minimum reset pulse width of 200ms during power-up, power-down, and brownout conditions. Typical duration is 350ms, with a maximum of 500ms. This extended pulse ensures complete initialization of microprocessors, FPGAs, and peripheral ICs-even those with slow clock startup or complex firmware boot sequences-without requiring external timing components.

Can the MAX700CSA+ monitor voltages other than +5V?

Yes, the MAX700CSA+ can monitor any voltage between 3V and 15V by configuring CTL = VCC and applying the target voltage to the SENSE pin through a resistor divider. The internal 1.29V reference sets the trip point, so a 12V rail would use a divider ratio of ~9.3:1 (e.g., 82.5kΩ top, 9.1kΩ bottom). This capability extends the utility of the MAX700CSA+ beyond +5V systems to diverse power architectures.

What is the operating temperature range of the MAX700CSA+?

The MAX700CSA+ is rated for the commercial temperature range of 0°C to +70°C, as indicated by the 'C' suffix in the part number. It is packaged in a narrow-SO-8 (SOIC-8) body with lead-free finish ('+' suffix), making it suitable for non-automotive, non-military applications such as consumer electronics, industrial controls, and office equipment where ambient temperatures remain within this envelope.