Analog Devices Inc./Maxim Integrated MAX702CSA+T

Overview

MAX702CSA+T from Maxim Integrated is a +5V power-supply supervisory circuit with factory-trimmed 4.65V reset threshold, debounced manual-reset input (MR), and guaranteed RESET output assertion down to VCC = 1V. It delivers a minimum 200ms active-low reset pulse during power-up, power-down, and brownout conditions, and operates in the commercial temperature range (0°C to +70°C) in an 8-pin narrow-SO package. It is used for reliable µP reset generation in embedded controllers and instrumentation.

For engineers reviewing the MAX702CSA+T datasheet, MAX702CSA+T pinout, MAX702CSA+T application, or MAX702CSA+T equivalent, key selection criteria include its fixed 4.65V detection threshold, MR debouncing capability, 200ms minimum reset pulse width, low 100–200µA supply current, and compatibility with +5V digital systems requiring robust power-on reset sequencing.

Technical Context

The MAX702CSA+T implements a precision bandgap-based voltage comparator with internal hysteresis (~30mV) to prevent chatter near the 4.65V threshold. Its RESET output is open-drain and specified to sink ≥3.2mA at VCC = 4.25V while maintaining ≤0.4V low-level voltage.

No external components are required for basic +5V monitoring. The MR input includes internal 5µA pullup and accepts TTL/CMOS-compatible logic levels, with a 0.7V threshold and guaranteed activation down to VCC = 1.5V.

Key Specifications

Pinout & Package

MAX702CSA+T is housed in an 8-pin narrow-SO (SOIC-8) package with 1.27mm pitch, RoHS-compliant lead-free finish (+ suffix). Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and ADM6710ARTZ-REEL7, the MAX702CSA+T uniquely combines fixed +5V optimization, integrated MR debouncing, and guaranteed 1V operation-making it optimal for cost-sensitive, high-reliability 5V µP systems where layout simplicity and deterministic brownout response are prioritized.

Availability

MAX702CSA+T is available at Aetrix Electronics and suitable for industrial controllers, medical instruments, point-of-sale terminals, and network edge devices requiring stable component supply across extended production lifecycles.

Supply support for MAX702CSA+T 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 precision analog, mixed-signal, and power-management ICs for industrial, computing, communications, and consumer applications.

The MAX700/MAX701/MAX702 family was engineered specifically for cost-effective, no-component-required power-supply supervision in +5V microprocessor systems-emphasizing reliability, low quiescent current, and robust reset timing.

FAQ

What is the reset threshold voltage of the MAX702CSA+T?

The MAX702CSA+T has a factory-trimmed reset threshold of 4.65V, with a tolerance of ±150mV over the full operating temperature range (0°C to +70°C). This value is optimized for +5V digital systems and requires no external resistors or calibration. The threshold applies to both power-up and power-down transitions, ensuring consistent behavior during supply ramp-up and brownout events. The MAX702CSA+T does not support adjustable thresholds-this feature is exclusive to the MAX700 variant.

Does the MAX702CSA+T provide a manual reset input, and how is it debounced?

Yes, the MAX702CSA+T includes a dedicated MR (Manual Reset) input on Pin 1, featuring internal hardware debouncing that eliminates the need for external RC filters or firmware-based timing. The MR pin has a 5µA internal pullup and activates RESET when driven below 0.7V. Debouncing is implemented internally using a monostable circuit with a fixed time constant, rejecting pulses shorter than ~10µs. This ensures clean reset assertion from mechanical pushbuttons without adding components or design complexity to the MAX702CSA+T implementation.

What is the minimum supply voltage at which the MAX702CSA+T guarantees correct RESET output state?

The MAX702CSA+T guarantees correct RESET output state-specifically, that RESET remains asserted (low) when VCC falls below threshold-down to VCC = 1.0V. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where "Min VCC for Valid Reset Output, Declining Supply" is specified as 1.0V when sinking 1mA. This capability ensures deterministic behavior during deep brownout or partial power failure, a key reliability feature distinguishing the MAX702CSA+T from many competing supervisors with higher minimum-VCC requirements.

Can the MAX702CSA+T drive a microprocessor reset pin directly without an external pullup resistor?

Yes, the MAX702CSA+T RESET output is an open-drain driver rated to sink ≥3.2mA at VCC = 4.25V while maintaining ≤0.4V output voltage. This allows direct connection to standard µP reset inputs (e.g., ARM, PIC, AVR) that require 10–100kΩ pullups and accept 0.4V max low-level voltage. No external pullup is required if the target µP provides an internal pullup or if board-level pullup is already present. However, an external pullup (typically 10kΩ to VCC) is recommended when driving multiple loads or long traces to ensure fast rise time and noise immunity for the MAX702CSA+T RESET signal.

What package type and RoHS status does the MAX702CSA+T use?

The MAX702CSA+T uses an 8-pin narrow-SO (SOIC-8) package with 1.27mm lead pitch and is RoHS-compliant with lead-free terminations, indicated by the "+" suffix in the part number. The package code "CSA" denotes Commercial temperature range (0°C to +70°C) and narrow-SO packaging. Land pattern reference is 90-0096 per Maxim's package documentation. This package supports standard reflow soldering profiles and is compatible with automated assembly processes used in high-volume industrial electronics manufacturing.