Analog Devices Inc./Maxim Integrated DS1708SESA+T&R

Overview

DS1708SESA+T&R from Maxim Integrated is a 3.3V ±10% supply voltage supervisor IC with dual active-high/active-low reset outputs, non-maskable interrupt (NMI), and pushbutton reset debouncing. It monitors VCC, senses external voltage via high-impedance IN pin, and guarantees ≥130 ms reset pulse width. Used in embedded microprocessor systems requiring reliable power-up/power-down sequencing and early power-fail warning.

For engineers reviewing the DS1708SESA+T&R datasheet, DS1708SESA+T&R pinout, DS1708SESA+T&R application, or DS1708SESA+T&R equivalent, key selection criteria include VCC trip point (2.85–3.00 V), industrial temperature range (−40°C to +85°C), SOIC-8 package compatibility, and NMI timing (≥200 ns pulse, 5 µs noise immunity).

Technical Context

The DS1708SESA+T&R implements a precision bandgap-referenced comparator for VCC monitoring and an independent high-impedance IN input for external voltage sensing at user-defined points. Its internal hysteresis (100 µV) and 5 µs detection delay prevent false NMI triggers from supply noise.

It delivers dual complementary reset outputs (RST and RST) with guaranteed minimum 130 ms assertion time during power-up and power-down events, plus pushbutton reset debouncing with 130 ms minimum active pulse after release. The PBRST input is internally pulled up to VCC (40 kΩ typical).

Key Specifications

Pinout & Package

DS1708SESA+T&R is housed in an 8-pin SOIC (150-mil) package with gull-wing leads, RoHS-compliant, tape-and-reel format (+T&R). Pin functions are electrically validated per Maxim's official mechanical drawings for DS1707/DS1708_R/S/T.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX708ESA+, DS1708SESA+T&R adds external voltage monitoring and NMI for predictive shutdown; versus TPS3808G12DBVR, it trades tighter trip tolerance for dual reset polarity, NMI, and industrial SOIC robustness-critical for legacy board upgrades and safety-critical sequencing.

Availability

DS1708SESA+T&R is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, telecom infrastructure, and smart metering applications requiring stable component supply across extended product lifecycles.

Supply support for DS1708SESA+T&R 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, and communications markets.

The DS1707/DS1708 family was engineered specifically for microprocessor system supervision-delivering integrated VCC monitoring, external voltage sensing, pushbutton control, and early-warning NMI in a single SOIC-8 device.

FAQ

What is the exact VCC trip voltage range for DS1708SESA+T&R?

The DS1708SESA+T&R is the DS1708S variant, specified with a VCC trip point of 2.85 V (min), 2.93 V (typ), and 3.00 V (max) - corresponding to 3.3V ±10% monitoring. This range is tested and guaranteed across the full −40°C to +85°C operating temperature range, and applies exclusively to the DS1708SESA+T&R device, not other DS1708 variants like R, T, or standard DS1708.

Does DS1708SESA+T&R support external voltage monitoring, and how is it implemented?

Yes, DS1708SESA+T&R supports external voltage monitoring via its IN pin, which compares an externally divided voltage against an internal 1.25 V reference. A resistor divider (e.g., R1 = 26 kΩ, R2 = 10 kΩ) scales higher voltages (up to 11.88 V at VCC = 3.3 V) down to the 1.20–1.30 V trip window. The IN pin draws ≤1 µA, ensuring minimal loading on the monitored source.

How does the NMI output of DS1708SESA+T&R behave during power failure?

When the voltage at the IN pin drops below 1.25 V, DS1708SESA+T&R pulses its open-drain NMI output low for ≥200 ns. This occurs before RST/RST activation, providing early warning. The circuit includes 100 µV hysteresis and requires the IN voltage to stay below threshold for ~5 µs to avoid noise-induced false triggers - a behavior confirmed in the DS1708SESA+T&R AC Electrical Characteristics table.

Is DS1708SESA+T&R pin-compatible with MAX707/MAX708, and what does that mean for layout?

Yes, DS1708SESA+T&R is pin-compatible with MAX707/MAX708 in the 8-pin SOIC (150-mil) package. All eight pins - including PBRST, VCC, GND, IN, RST, RST, NC, and NMI - match functionally and physically. This allows drop-in replacement on existing boards designed for MAX707ESA or MAX708ESA without PCB modifications or netlist changes.

What is the guaranteed reset pulse width for DS1708SESA+T&R during power-up and pushbutton events?

DS1708SESA+T&R guarantees a minimum reset pulse width of 130 ms for both power-up recovery and pushbutton-initiated reset. This is measured from VCC crossing the trip threshold (or PBRST release) until RST/RST deassert, and remains valid across −40°C to +85°C and VCC = 2.85–3.00 V - a specification explicitly listed in the DS1708SESA+T&R AC Electrical Characteristics table.