Analog Devices Inc./Maxim Integrated DS1706TESA+

Overview

DS1706TESA+ from Maxim Integrated is a 3.3V ±5% precision voltage supervisor IC with watchdog timer, non-maskable interrupt (NMI), and pushbutton reset control. It monitors VCC, senses external supply voltage via high-impedance IN pin, asserts active-low RST on power failure, and guarantees ≥130 ms reset pulse width. Used in embedded microprocessor systems requiring reliable power-up sequencing and fail-safe recovery.

For engineers reviewing the DS1706TESA+ datasheet, DS1706TESA+ pinout, DS1706TESA+ application, or DS1706TESA+ equivalent, key selection criteria include 3.3V ±5% VCC trip point (VCCTP = 3.00–3.15 V), 130–285 ms reset timeout, 1 s watchdog timeout, NMI early-warning capability, and compatibility with industrial temperature range (−40°C to +85°C).

Technical Context

The DS1706TESA+ integrates three independent monitoring functions: (1) precision VCC supervision with 5% tolerance at 3.3V (VCCTP = 3.00–3.15 V), (2) high-impedance IN-pin voltage sensing referenced to 1.25 V internal bandgap, enabling early power-fail detection upstream of VCC, and (3) a 1-second watchdog timer triggered by ST input transitions, with WDS output asserting low on timeout.

Its reset logic features built-in hysteresis and noise immunity (rejects <2 µs glitches), while the PBRST input includes internal 40 kΩ pull-up and debouncing to guarantee ≥130 ms active-low RST pulse upon button release. All timing parameters-including tRST (130–285 ms), tTD (1.0–2.2 s), and tIPD (5–8 µs)-are specified across −40°C to +85°C.

Key Specifications

Pinout & Package

DS1706TESA+ is housed in an 8-pin SOIC (150-mil) package, RoHS-compliant and lead-free, with standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog applications.

Compared with MAX6326UT43D3+ and TPS3808G33DBVR, DS1706TESA+ uniquely combines ±5% 3.3V supervision, integrated NMI for upstream fault detection, and a self-contained watchdog with ST input-enabling single-chip fail-safe monitoring without external components.

Availability

DS1706TESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, telecom remote terminals, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for DS1706TESA+ 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, automotive, communications, and computing applications.

The DS1706TESA+ belongs to the MicroMonitor™ family-engineered specifically for robust microprocessor supervision in mission-critical embedded systems demanding simultaneous VCC monitoring, early-warning interrupt, and software watchdog functionality.

FAQ

What is the exact VCC trip point range for DS1706TESA+?

The DS1706TESA+ has a guaranteed VCC trip point (VCCTP) of 3.00 V to 3.15 V, corresponding to ±5% tolerance at a nominal 3.3V supply. This specification is validated across the full industrial temperature range (−40°C to +85°C) and ensures reliable reset assertion before microprocessor operational limits are exceeded. The DS1706TESA+ datasheet explicitly defines this range in its DC Electrical Characteristics table.

Does DS1706TESA+ provide both active-high and active-low reset outputs?

No, DS1706TESA+ provides only an active-low reset output (RST). Unlike variants such as DS1706LESA+ or DS1706PEUA+, the DS1706TESA+ does not include an active-high *RST output. Its pinout contains RST (pin 6), WDS (pin 1), NMI (pin 5), and no dedicated *RST terminal. This configuration is confirmed in the Pin Assignment diagram and Ordering Information table for DS1706TESA+.

How does the DS1706TESA+ watchdog timer function, and what is its timeout window?

The DS1706TESA+ watchdog timer initiates timing upon RST deactivation and requires a high-to-low transition on the ST pin at least once every 1.0–2.2 seconds. If no ST edge occurs within that window, WDS is driven low for ≥130 ms. The timeout is factory-trimmed and tested at 2.7V for 3.3V devices, with typical value 1.6 s. This behavior is documented in the AC Electrical Characteristics table under parameter tTD.

Can DS1706TESA+ monitor a voltage higher than its VCC supply?

Yes, DS1706TESA+ can monitor voltages above VCC using the high-impedance IN pin with an external resistor divider. The IN pin's trip point is fixed at 1.25 V (1.20–1.30 V), so a divider network scales higher input voltages down to this threshold. For example, with VCC = 3.3V, a 4.5V sense point yields a maximum allowable input of 11.88V. This capability is explicitly detailed in Figure 5 and the Non-Maskable Interrupt section of the DS1706TESA+ datasheet.

Is DS1706TESA+ pin-compatible with other members of the DS1705/DS1706 family?

Yes, DS1706TESA+ is pin-compatible with all 8-pin SOIC variants in the DS1705/DS1706 family-including DS1705ESA+, DS1706ESA+, DS1706LESA+, and DS1706SESA+. The pin assignment (PBRST, VCC, GND, IN, NMI, ST, RST, WDS) and SOIC footprint (S8-2 package) are identical across these parts. This compatibility is stated in the Features section and confirmed in the Ordering Information table.