Analog Devices Inc./Maxim Integrated DS1706PEPA

Overview

DS1706PEPA from Maxim Integrated is a 3.3V ±20% microprocessor supervisory circuit with active-high reset output (RST), watchdog status output (WDS), and non-maskable interrupt (NMI). It monitors VCC, detects power transients, provides pushbutton reset debouncing, and delivers 130 ms minimum reset pulse width. Used in embedded systems requiring reliable power-up/power-down sequencing and early fault detection.

For engineers reviewing the DS1706PEPA datasheet, DS1706PEPA pinout, DS1706PEPA application, or DS1706PEPA equivalent, key selection criteria include its 3.3V supply monitoring tolerance, RST active-high output polarity, industrial temperature range, watchdog timeout of 1.0–2.2 s, and compatibility with 8-pin PDIP packaging for legacy board designs.

Technical Context

The DS1706PEPA implements three independent monitoring functions: precision VCC threshold detection using an internal bandgap reference (VTP = 1.25 V), a 1-second watchdog timer triggered by ST input strobes, and pushbutton reset debouncing with guaranteed 130 ms active reset pulse. Its NMI output provides early warning at 200 µs pulse width when IN voltage falls below trip point.

It supports flexible system-level integration via high-impedance IN pin for external voltage divider sensing, internal pull-ups on PBRST (40 kΩ) and ST (180 kΩ), and dual reset output options (RST active-high / *RST active-low) - with DS1706PEPA specifically configured for RST (active-high) and WDS (active-low).

Key Specifications

Pinout & Package

DS1706PEPA is housed in an 8-pin plastic DIP (300-mil) package, compatible with through-hole assembly and legacy prototyping. Pin assignments are standardized across DS1705/DS1706 family variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX706PEPA and TPS3808G33DBVR, DS1706PEPA uniquely combines 3.3V ±20% tolerance, active-high RST, NMI early warning, and ST-based watchdog in a single 8-pin DIP - making it optimal for cost-sensitive industrial designs needing comprehensive supervision without redesign.

Availability

DS1706PEPA is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, telecom remote terminals, and automotive infotainment gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DS1706PEPA 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 analog and mixed-signal ICs for power management, sensing, and interface applications.

The DS1706PEPA belongs to the MicroMonitor™ family - designed specifically for robust microprocessor supervision in industrial, medical, and communications equipment where reliability under voltage transients and brownouts is critical.

FAQ

What is the VCC trip point range for DS1706PEPA?

The DS1706PEPA has a VCC trip point range of 2.55 V to 2.70 V, corresponding to 3.3V ±20% monitoring. This allows reliable operation with 3.0V nominal supplies while accommodating expected tolerance drift and brownout conditions. The specification is validated across the full −40°C to +85°C operating temperature range and is defined in the DC Electrical Characteristics table of the official datasheet.

Does DS1706PEPA provide both active-high and active-low reset outputs?

No, DS1706PEPA provides only the active-high RST output. The *RST (active-low) output is available on other variants like DS1706EPA and DS1706LEPA, but DS1706PEPA is specifically configured with RST (pin 6) as active-high and WDS (pin 2) as active-low. This is confirmed in the Ordering Information table and Pin Assignment diagram for DS1706PEPA.

How does the watchdog timer in DS1706PEPA function?

The DS1706PEPA watchdog timer times out after 1.0–2.2 seconds if the ST input (pin 5) is not strobed low before expiration. Upon timeout, WDS (pin 2) is driven active-low for ≥130 ms. The timer resets on each ST falling edge, and starts counting only after RST becomes inactive. This behavior ensures detection of software hangs without requiring changes to the host microprocessor's firmware architecture.

Can DS1706PEPA monitor voltages higher than 3.3V?

Yes, DS1706PEPA can monitor higher voltages using the IN pin (pin 4) with an external resistor divider. Since the internal trip point is fixed at 1.25 V, a properly scaled divider (e.g., R1 = 26 kΩ, R2 = 10 kΩ for 4.5 V sense) allows safe monitoring of rails up to ~12 V. The datasheet specifies that IN voltage must not exceed VCC, so the divider ensures compliance while preserving high-impedance sensing.

Is DS1706PEPA pin-compatible with MAX705/MAX706 devices?

Yes, DS1706PEPA is pin-compatible with MAX705/MAX706 in 8-pin DIP, SOIC, and µSOP packages. The pin assignments for VCC, GND, IN, NMI, ST, RST, PBRST, and WDS match exactly, enabling drop-in replacement in existing layouts. This compatibility is explicitly stated in the Features section and verified in the Pin Assignment diagrams for both families.