Analog Devices Inc./Maxim Integrated DS1708TEPA+

Overview

DS1708TEPA+ from Maxim Integrated is a 3.3V ±5% precision voltage supervisor IC that monitors VCC, senses external supply voltage via high-impedance IN pin, and debounces pushbutton reset input to generate active-high and active-low reset signals. It delivers 130ms minimum reset pulse width, non-maskable interrupt on power decay, and operates across -40°C to +85°C for industrial microprocessor power management.

For engineers reviewing the DS1708TEPA+ datasheet, DS1708TEPA+ pinout, DS1708TEPA+ application, or DS1708TEPA+ equivalent, this page provides verified functional specifications, validated pin assignments for 8-pin DIP, confirmed reset timing (tRST = 130–285ms), NMI response latency (tIPD = 5–8µs), and direct comparability with MAX707/MAX708 in same package footprint.

Technical Context

The DS1708TEPA+ integrates three independent monitoring functions: VCC threshold detection at 3.08V (typical) with 5% tolerance, high-impedance voltage sense input (IN) referenced to 1.25V internal bandgap, and debounced pushbutton reset logic with 130ms guaranteed pulse width. All functions operate without external components.

Its dual-reset outputs (RST and RST) provide simultaneous active-high and active-low signals for processor reset control, while the NMI output delivers early warning of supply decay before VCC drops below trip point - enabling graceful system shutdown. Hysteresis (100µV) and noise immunity (<2µs pulses rejected) ensure robust operation in noisy environments.

Key Specifications

Pinout & Package

DS1708TEPA+ uses an 8-pin Plastic DIP (300-mil) package with standard through-hole footprint. Pin assignments are validated per Maxim's mechanical drawings for DS1707/DS1708 family.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX708ESA+, DS1708TEPA+ offers tighter 5% tolerance for 3.3V rails and earlier fault detection via NMI; versus TPS3808G33DBVR, it provides integrated dual-reset signaling and pushbutton interface - eliminating four external components in typical implementations.

Availability

DS1708TEPA+ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, telecom infrastructure, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and drop-in compatibility with legacy Maxim MicroMonitor designs.

Supply support for DS1708TEPA+ 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 applications.

The DS1707/DS1708 family was designed as a pin-compatible upgrade path from earlier MAX707/MAX708 supervisors, delivering enhanced accuracy, dual-reset outputs, and integrated NMI functionality for robust microprocessor power monitoring.

FAQ

What is the exact VCC trip point specification for DS1708TEPA+?

The DS1708TEPA+ has a guaranteed VCC trip point of 3.00V (min), 3.08V (typical), and 3.15V (max) at -40°C to +85°C, corresponding to a 3.3V nominal supply with ±5% tolerance. This value is factory-trimmed and specified in the DC Electrical Characteristics table of the official datasheet. The DS1708TEPA+ uses this threshold to assert RST and RST outputs when VCC falls below the lower limit, ensuring reliable reset behavior in 3.3V systems.

Does DS1708TEPA+ support both active-high and active-low reset outputs simultaneously?

Yes, DS1708TEPA+ provides two independent reset outputs: RST (active-high) and RST (active-low), both asserted concurrently during power-up, power-down, or pushbutton events. Each output meets CMOS voltage levels - RST sources ≥350µA at 2.4V, and RST sinks ≥10mA at 0.4V - enabling direct interface with diverse microcontrollers and FPGAs without level-shifting. This dual-output capability is intrinsic to the DS1708TEPA+ design and requires no configuration.

How does the NMI output of DS1708TEPA+ differ from the RST outputs in timing and function?

The NMI output of DS1708TEPA+ serves as an early warning signal, triggered when the IN pin voltage falls below 1.25V (±0.05V), typically 5–8µs before VCC drops below its trip point. It pulses low for ≥200µs, allowing firmware to initiate shutdown routines. In contrast, RST and RST activate only after VCC decay, with 130–285ms minimum pulse width. Thus, DS1708TEPA+'s NMI enables proactive response, while RST/RST enforce hard reset - complementary roles defined in the DS1708TEPA+ functional architecture.

Can DS1708TEPA+ monitor voltages higher than 3.3V using the IN pin?

Yes, DS1708TEPA+ can monitor voltages higher than 3.3V via the IN pin using an external resistor divider. The IN pin references an internal 1.25V bandgap, so for a target sense voltage (e.g., 12V), R1 and R2 values are calculated using VSENSE = (R2/(R1+R2)) × 1.25V. The DS1708TEPA+ datasheet provides the formula and example (e.g., 10kΩ R2 yields R1 = 26kΩ for 4.5V sense). Input current remains <1µA, preserving accuracy without loading the source.

Is DS1708TEPA+ pin-compatible with MAX707/MAX708 in 8-pin DIP packages?

Yes, DS1708TEPA+ is explicitly stated as pin-compatible with MAX707 and MAX708 in 8-pin DIP, SOIC, and µSOP packages. Pin assignments - including PBRST, VCC, GND, IN, RST, RST, NC, and NMI - match identically across all three devices. This allows DS1708TEPA+ to serve as a direct replacement in existing MAX707/MAX708 designs targeting 3.3V ±5% supervision, with no PCB layout changes required.