Analog Devices Inc./Maxim Integrated DS1815R-10-U

Overview

DS1815R-10-U from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring reset IC with push-pull output, designed to automatically restart microprocessors after power failure. It provides 10% V_CC trip point accuracy (2.80–2.97 V), guarantees 150 ms reset pulse width, and operates across –40°C to +85°C in SOT-23 package for embedded power supervision.

For engineers reviewing the DS1815R-10-U datasheet, DS1815R-10-U pinout, DS1815R-10-U application, or DS1815R-10-U equivalent, key selection criteria include guaranteed reset timeout, push-pull drive capability, temperature-compensated trip threshold, and compatibility with 3.3 V microcontroller supply rails.

Technical Context

The DS1815R-10-U integrates a precision temperature-compensated voltage reference and comparator to detect V_CC deviations beyond ±10%. Its internal circuitry asserts RST low on out-of-tolerance detection and holds it active for 100–250 ms after V_CC recovery, ensuring stable processor boot.

It features CMOS push-pull output capable of sourcing 350 µA at 2.4 V and sinking 10 mA at 0.4 V, with quiescent current as low as 28 µA. The device supports V_CC from 0 V to 5.5 V and maintains valid RST assertion down to 0 V on V_CC.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (2.92 mm × 1.3 mm × 1.0 mm), RoHS-compliant, with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-monitoring reset applications.

Compared with TPS3808G12DBVR and MAX6326UT29D3+T, the DS1815R-10-U offers optimal balance of 3.3 V system compatibility, push-pull simplicity, and industrial temperature support - making it ideal for cost-sensitive, space-constrained embedded reset supervision without external components.

Availability

DS1815R-10-U is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and smart metering applications requiring stable component supply and long-term lifecycle continuity.

Supply support for DS1815R-10-U 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

Analog Devices (via acquisition of Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.

The DS1815R-10-U belongs to Maxim's EconoReset™ family - engineered for cost-effective, single-supply power monitoring and microprocessor reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip point range for DS1815R-10-U?

The DS1815R-10-U has a guaranteed V_CC trip point range of 2.80 V to 2.97 V, corresponding to its ±10% tolerance specification relative to a nominal 3.0 V threshold. This range is validated across –40°C to +85°C and ensures robust detection of out-of-tolerance conditions in 3.3 V systems without requiring external calibration. The DS1815R-10-U uses an internal temperature-compensated reference to maintain this accuracy.

Does DS1815R-10-U require an external pull-up resistor on the RST pin?

No, the DS1815R-10-U features a push-pull output stage that actively drives RST high and low, eliminating the need for an external pull-up resistor. This reduces component count and PCB area compared to open-drain reset ICs. The DS1815R-10-U can source up to 350 µA and sink up to 10 mA on the RST pin, directly interfacing with standard CMOS inputs without additional circuitry.

How long is the reset pulse held active after V_CC returns to tolerance?

The DS1815R-10-U holds the RST pin active low for 100–250 ms after V_CC recovers to within its trip threshold window. The typical value is 150 ms, providing sufficient time for power supply and microprocessor stabilization before release. This timing is internally generated and independent of external capacitors or resistors - a key feature of the DS1815R-10-U design.

Can DS1815R-10-U operate with V_CC below 1.0 V?

Yes, the DS1815R-10-U remains functional and asserts RST validly down to 0 V on the V_CC pin, as confirmed in the datasheet's "RST VALID TO 0 VOLTS VCC" diagram. While normal monitoring begins above ~1.2 V, the device continues asserting reset during deep brown-out and full power collapse - a critical capability for reliable restart in DS1815R-10-U-based systems.

Is DS1815R-10-U compatible with both 3.3 V and 5 V microcontrollers?

Yes, the DS1815R-10-U supports V_CC supply voltages from 0 V to 5.5 V and delivers a push-pull RST output compatible with both 3.3 V and 5 V logic families. Its output voltage levels meet CMOS thresholds across this range, and its 10% trip point (2.80–2.97 V) is optimized for 3.3 V systems while remaining usable in 5 V domains with appropriate decoupling. The DS1815R-10-U requires no level-shifting circuitry.