Analog Devices Inc./Maxim Integrated DS1706PESA+

Overview

DS1706PESA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high reset output (RST), watchdog timer, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC for 3.3V ±20% tolerance (trip point 2.55–2.70V), provides 130 ms minimum reset pulse width, and operates across –40°C to +85°C. Used in embedded industrial controllers to prevent runaway code during power transients.

For engineers reviewing the DS1706PESA+ datasheet, DS1706PESA+ pinout, DS1706PESA+ application, or DS1706PESA+ equivalent, key selection factors include its RST-active-high output configuration, 3.3V-20% monitoring threshold, 1-second watchdog timeout, NMI early-warning capability, and compatibility with SOIC-8 footprint for space-constrained designs.

Technical Context

The DS1706PESA+ integrates three independent monitoring functions: precision VCC supervision using an internal bandgap reference and comparator, a 1-second watchdog timer triggered by ST input strobes, and a debounced pushbutton reset input (PBRST) that guarantees ≥130 ms active-high reset assertion. Its IN pin enables external voltage sensing at user-defined points via resistor divider.

It delivers dual reset signaling: RST (active-high) and WDS (watchdog status, active-low), while NMI provides early power-fail warning with 200 µs pulse width and 100 µV hysteresis. All timing parameters-including tRST (130–285 ms), tTD (1.0–2.2 s), and tIPD (5–8 µs)-are specified over full industrial temperature range and supply voltage (1.2–5.5V).

Key Specifications

Pinout & Package

DS1706PESA+ is housed in an 8-pin SOIC (150-mil) package, RoHS-compliant and lead-free, with standard JEDEC MS-012AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706TESA+ and TPS3808G12DBVR, DS1706PESA+ uniquely combines RST (active-high), NMI, and PBRST in SOIC-8-making it optimal for industrial systems needing both early warning and hardware-initiated reset without layout changes.

Availability

DS1706PESA+ is available at Aetrix Electronics and suitable for industrial automation, smart metering, and network infrastructure applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS1706PESA+ 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, mixed-signal, and power management ICs for industrial, communications, and computing markets.

The DS1706PESA+ belongs to the MicroMonitor™ family-designed specifically for robust microprocessor supervision in harsh environments where power integrity, watchdog reliability, and early fault detection are critical.

FAQ

What is the VCC trip point range for DS1706PESA+?

The DS1706PESA+ has a VCC trip point range of 2.55 V to 2.70 V, corresponding to 3.3V ±20% monitoring. This specification is confirmed in the DC Electrical Characteristics table of the official datasheet (Rev 4/10, page 9). The trip point is factory-trimmed and temperature-compensated, ensuring consistent reset activation across the full –40°C to +85°C operating range. DS1706PESA+ uses this threshold to assert RST when VCC falls below tolerance, making it ideal for 3.0V nominal systems with wide supply variation.

Does DS1706PESA+ provide an active-high or active-low reset output?

DS1706PESA+ provides an active-high reset output labeled RST (pin 6), as explicitly defined in the PIN ASSIGNMENT section and confirmed in the Ordering Information table (page 11). Unlike variants such as DS1706RESA+, which offer /RST (active-low), DS1706PESA+ is designated with "RST" in its version suffix, indicating high-asserted reset. This eliminates the need for external inversion when interfacing with MCUs requiring high-active reset signals.

How does the watchdog timer function in DS1706PESA+?

The DS1706PESA+ watchdog timer times out after 1.0–2.2 seconds if the ST input (pin 7) is not strobed with a falling edge. Time-out begins when RST becomes inactive after power-up or reset release. Upon timeout, WDS (pin 5) goes active-low for ≥130 ms. The ST input is internally pulled up to VCC (180 kΩ typical), so a simple MCU GPIO toggle suffices. This behavior is documented in the OPERATION section (page 2) and AC Electrical Characteristics (page 9).

Can DS1706PESA+ monitor voltages other than VCC?

Yes, DS1706PESA+ can monitor external voltages via the IN pin (pin 4), which has a fixed 1.25 V trip threshold. A resistor divider scales higher voltages (e.g., 12V, 24V rails) down to the IN input range. The datasheet provides the equation VSENSE = (R2/(R1+R2)) × 1.25 V and confirms maximum allowable monitored voltage (VMAX) depends on VCC (page 5). This enables early power-fail detection upstream of the 3.3V regulator, extending system response time before RST assertion.

Is DS1706PESA+ pin-compatible with other MicroMonitor devices?

Yes, DS1706PESA+ is pin-compatible with the MAX705/MAX706 family in 8-pin SOIC, DIP, and µSOP packages, as stated in the FEATURES section (page 1). Pin mapping matches exactly: PBRST (1), VCC (2), GND (3), IN (4), WDS (5), RST (6), ST (7), NMI (8). This allows drop-in replacement in existing layouts designed for MAX706ESA+ or DS1706RESA+, provided the RST vs /RST output polarity and trip point tolerance align with system requirements.