Analog Devices Inc./Maxim Integrated DS1810R-15/T&R

Overview

DS1810R-15/T&R 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 asserts an active-low reset for 150 ms after V_CC returns to tolerance, features a 4.00–4.24 V trip point (±15% tolerance), operates from 1.2 V to 5.5 V, and supports -40°C to +85°C industrial temperature range - used in embedded power-up sequencing and brownout protection.

For engineers reviewing the DS1810R-15/T&R datasheet, DS1810R-15/T&R pinout, DS1810R-15/T&R application, or DS1810R-15/T&R equivalent, key selection criteria include guaranteed 150 ms reset pulse width, push-pull output capable of sinking 10 mA at 0.4 V, valid RST operation down to V_CC = 1.2 V (extendable to 0 V with external pull-down), and SOT-23-3 package compatibility with TO-92 footprint alternatives.

Technical Context

The DS1810R-15/T&R integrates a precision temperature-compensated voltage reference and comparator to monitor V_CC against a fixed 4.12 V nominal trip threshold (15% tolerance band). Upon detection of out-of-tolerance supply, it immediately asserts RST; upon recovery, it holds RST active for 100–300 ms (typ. 150 ms) to ensure system stability.

Its push-pull output architecture eliminates need for external pull-up resistors, delivers VOH ≥ V_CC−0.5 V and VOL ≤ 0.4 V at I_OL = 10 mA, and maintains logic-valid output even as V_CC drops below 1.2 V when a 100 kΩ resistor connects RST to GND - enabling robust power-down signaling to 0 V.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package (3.0 mm × 1.7 mm × 1.3 mm), lead-free, RoHS-compliant. Pin-compatible with TO-92 variant (pin 1 = RST, pin 2 = V_CC, pin 3 = GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G15DBVR, the DS1810R-15/T&R offers unique 0 V RST extension capability via simple resistor, fixed 150 ms timing for predictable startup, and optimized cost for high-volume industrial applications where ±15% trip tolerance is acceptable.

Availability

DS1810R-15/T&R is available at Aetrix Electronics and suitable for industrial PLCs, smart metering systems, IoT edge sensors, and medical handheld diagnostics requiring stable component supply and long-term lifecycle support.

Supply support for DS1810R-15/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 and mixed-signal ICs for industrial, automotive, and communications applications - emphasizing reliability, integration, and performance under harsh conditions.

The DS1810R-15/T&R belongs to the EconoReset™ family of supervisory circuits, engineered specifically for cost-sensitive embedded systems needing dependable power-on reset and brownout protection without external components.

FAQ

What is the exact V_CC trip point range for DS1810R-15/T&R?

The DS1810R-15/T&R has a guaranteed V_CC trip point range of 4.00 V to 4.24 V at +25°C, corresponding to a nominal 4.12 V threshold with ±15% tolerance. This range is validated across the full -40°C to +85°C operating temperature and ensures consistent brownout detection for 5 V systems without requiring calibration.

Does DS1810R-15/T&R require an external pull-up resistor on the RST pin?

No, DS1810R-15/T&R does not require an external pull-up resistor because it features a push-pull output stage. The RST pin actively drives high (VOH ≥ V_CC−0.5 V) and low (VOL ≤ 0.4 V at 10 mA), enabling direct connection to CMOS inputs without additional components - reducing BOM count and board space.

Can DS1810R-15/T&R maintain a valid RST output when V_CC drops below 1.2 V?

Yes, DS1810R-15/T&R can maintain a valid RST output down to 0 V V_CC when a 100 kΩ resistor is connected between RST and GND. This configuration allows the output to sink current during power-down, preserving defined logic state through full supply collapse - a key feature verified in Figure 3 of the official DS1810 datasheet.

What is the minimum and maximum reset pulse width for DS1810R-15/T&R?

The DS1810R-15/T&R guarantees a reset pulse width (t_RST) of 100 ms minimum and 300 ms maximum, with typical value of 150 ms. This timing is measured from V_CC crossing the trip threshold back into tolerance until RST deasserts, and is specified across -40°C to +85°C and 1.2 V to 5.5 V V_CC.

Is DS1810R-15/T&R available in both TO-92 and SOT-23 packages?

Yes, DS1810R-15/T&R is offered in SOT-23-3 surface-mount packaging (as indicated by the "/T&R" suffix denoting tape-and-reel). While the same DS1810R-15 device is also available in TO-92, the DS1810R-15/T&R specifically refers to the SOT-23-3 variant - confirmed by pin assignment diagrams and mechanical drawings in the Maxim/Analog Devices datasheet.