Analog Devices Inc./Maxim Integrated DS1817R-10/T&R

Overview

DS1817R-10/T&R from Maxim Integrated (now Analog Devices) is a precision voltage-monitoring supervisory IC that provides active-high reset assertion during power-supply faults and holds reset for 150 ms after V_CC recovery. It features 10% V_CC trip tolerance (2.80–2.97 V), push-pull CMOS output, and operates from -40°C to +85°C in SOT-23 package - used in embedded microcontroller power-up sequencing and brownout protection.

For engineers reviewing the DS1817R-10/T&R datasheet, DS1817R-10/T&R pinout, DS1817R-10/T&R application, or DS1817R-10/T&R equivalent, key selection criteria include confirmed 10% trip threshold accuracy, guaranteed 150 ms reset timeout, push-pull output drive capability (350 µA high, 10 mA low), SOT-23-3 package compatibility, and operation down to 1.2 V supply.

Technical Context

The DS1817R-10/T&R integrates a temperature-compensated bandgap reference and comparator to detect V_CC deviations against its factory-trimmed 10% threshold (2.80–2.97 V). Its internal timing circuit ensures reset remains asserted ≥100 ms and ≤250 ms after V_CC returns to tolerance, with typical 150 ms duration.

No external components are required: the device combines voltage sensing, reference generation, comparison, and timed reset assertion in a single SOT-23-3 IC. The push-pull output eliminates need for external pull-up resistors and supports direct interface to microcontroller reset inputs.

Key Specifications

Pinout & Package

SOT-23-3 surface-mount package with 1.3 mm × 2.9 mm footprint, JEDEC MO-178AA compliant, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326–UR31 and TPS3808G12DBVR, the DS1817R-10/T&R offers factory-trimmed 10% tolerance optimized for 3.0 V systems, zero-component operation, and guaranteed 150 ms reset hold - simplifying design for cost-sensitive industrial controllers where fixed 3.0 V supervision suffices.

Availability

DS1817R-10/T&R is available at Aetrix Electronics and suitable for industrial control systems, smart metering platforms, and POS terminal designs requiring stable component supply, long-term lifecycle support, and verified reset timing behavior.

Supply support for DS1817R-10/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

Analog Devices (acquired Maxim Integrated in 2021) designs high-performance analog, mixed-signal, and power management ICs for precision sensing, signal conditioning, and system supervision.

The DS1817R-10/T&R belongs to Maxim's EconoReset™ family - engineered for reliable, low-cost power-supply monitoring in resource-constrained embedded systems where simplicity, small size, and guaranteed reset timing are critical.

FAQ

What is the exact V_CC trip threshold range for DS1817R-10/T&R?

The DS1817R-10/T&R has a factory-trimmed V_CC trip threshold ranging from 2.80 V (minimum) to 2.97 V (maximum), corresponding to a nominal 10% tolerance around 3.0 V. This range is specified under -40°C to +85°C and is guaranteed per device - no external calibration is needed. The DS1817R-10/T&R uses an internal temperature-compensated reference to maintain this accuracy across operating temperature.

Does DS1817R-10/T&R require an external pull-up resistor on the RST pin?

No, the DS1817R-10/T&R features a push-pull CMOS output stage on the RST pin, eliminating the need for an external pull-up resistor. It actively drives high (up to V_CC – 0.1 V) and low (down to 0.4 V at 10 mA), enabling direct connection to standard microcontroller reset inputs. This reduces BOM count and PCB space versus open-drain alternatives like the MAX6326–UR31.

How long does the DS1817R-10/T&R hold reset active after V_CC recovers?

The DS1817R-10/T&R holds the RST output active for 100–250 ms after V_CC returns to within its trip threshold window, with a typical duration of 150 ms. This guaranteed minimum hold time ensures microprocessors and power supplies fully stabilize before release. The timing is internally generated and independent of external components - a key feature of the DS1817R-10/T&R design.

Is DS1817R-10/T&R compatible with 1.8 V or 2.5 V supply rails?

Yes, the DS1817R-10/T&R operates with V_CC from 1.2 V to 5.5 V, but its 10% trip threshold (2.80–2.97 V) is specifically calibrated for 3.0 V systems. When used with lower rails like 1.8 V or 2.5 V, it will still function as a supervisor but will assert reset whenever V_CC falls below 2.80 V - potentially causing false triggers. For those rails, consider the DS1817R-20/T&R (2.47–2.64 V) instead.

What package type is used for DS1817R-10/T&R?

The DS1817R-10/T&R is supplied in the SOT-23-3 surface-mount package (JEDEC MO-178AA), with 1.3 mm × 2.9 mm footprint and gull-wing leads. It is lead-free and RoHS-compliant. The part marking "R" indicates SOT-23 packaging; TO-92 versions exist but are not used for the DS1817R-10/T&R variant.