Analog Devices Inc./Maxim Integrated DS1836CS-10/T&R

Overview

DS1836CS-10/T&R from Maxim Integrated is a 3.3V microprocessor supervisory circuit with power-switching, NMI generation, and precision reset timing. It monitors VCC for out-of-tolerance conditions, switches VOUT between VCC and VBAT at 2.6V/2.8V thresholds, asserts RST for 350ms after recovery, and triggers NMI when IN drops below 1.25V - used in PIC-based embedded systems requiring dual-supply failover and early power-fail warning.

For engineers reviewing the DS1836CS-10/T&R datasheet, DS1836CS-10/T&R pinout, DS1836CS-10/T&R application, or DS1836CS-10/T&R equivalent, key selection criteria include VCC trip point (2.88V typ), battery switchover hysteresis (0.1V), NMI response time (1μs), RST active duration (350ms), and SO-8 package compatibility with industrial temperature range (-40°C to +85°C).

Technical Context

The DS1836CS-10/T&R implements a dual-threshold comparator architecture for VCC monitoring: it asserts RST when VCC falls below 2.80–2.97V (trip) and releases only after VCC rises above 2.70–2.80V (return), delivering 0.1V hysteresis. Its internal bandgap reference (1.25V ±0.1V) drives both the RST comparator and the IN-sense comparator, enabling independent early-warning NMI generation at user-defined voltage points via external resistor dividers.

As a power-switching supervisor, DS1836CS-10/T&R uses push-pull RST output capable of valid logic states down to 0V VCC, while its VOUT rail automatically selects between VCC and VBAT based on real-time voltage comparison - with no external FETs or control logic required. The device operates across full 1.2V–5.5V supply ranges on both VCC and VBAT inputs, supporting true 3.3V system designs without level-shifting.

Key Specifications

Pinout & Package

DS1836CS-10/T&R is packaged in an 8-pin SOIC (150-mil width), surface-mount package compliant with JEDEC MS-012. Pinout is identical across DS1836A/B/C/D variants and supports direct PCB footprint reuse.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX6326UT29D3+ and TPS3808G33DBVR, DS1836CS-10/T&R uniquely integrates three functions - precision reset, automatic VCC/VBAT switchover, and early NMI - in one SO-8 package, reducing BOM count and eliminating layout complexity associated with discrete power-fail detection.

Availability

DS1836CS-10/T&R is available at Aetrix Electronics and suitable for industrial PLC I/O modules, PIC-based data loggers, medical infusion pump controllers, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for DS1836CS-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

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on reliability and integration.

The DS1836 family targets microprocessor-based systems needing coordinated power monitoring, failover, and reset - specifically engineered for PIC and other 3.3V microcontrollers operating in harsh environments.

FAQ

What is the exact VCC reset threshold for DS1836CS-10/T&R?

The DS1836CS-10/T&R has a specified VCC reset trip point of 2.80V (min), 2.88V (typ), and 2.97V (max) - calibrated for 3.3V systems. This threshold is factory-trimmed and temperature-compensated, ensuring consistent behavior across the full -40°C to +85°C operating range without external adjustment. DS1836CS-10/T&R uses this value to assert RST during brownout and maintain it until VCC recovers above 2.70–2.80V.

Does DS1836CS-10/T&R support true 3.3V-only operation without 5V compatibility?

Yes, DS1836CS-10/T&R is explicitly designed for 3.3V systems: its VCC trip point (2.88V typ), switchover thresholds (2.6V/2.8V), and recommended operating conditions (VCC = 1.2V to 5.5V) fully accommodate 3.3V nominal rails. Unlike DS1836A/B variants, DS1836CS-10/T&R omits 5V-specific thresholds and is optimized for lower-voltage stability - confirmed by its "-10" suffix denoting the 3.3V-optimized version of the DS1836C series.

How does the NMI function work on DS1836CS-10/T&R, and what external components are required?

The NMI output on DS1836CS-10/T&R is an open-drain signal triggered when the voltage at the IN pin falls below 1.25V (1.15–1.35V range). A pull-up resistor (typically 10kΩ to VCC or VBAT) is mandatory for proper logic-level definition. The IN pin accepts user-defined sense points via external resistor dividers - for example, scaling a 5V rail to 1.25V using R1 = 260kΩ and R2 = 100kΩ. DS1836CS-10/T&R's 1μs NMI delay enables deterministic firmware response prior to RST activation.

Can DS1836CS-10/T&R maintain valid RST output when VCC drops to 0V?

Yes, DS1836CS-10/T&R features a push-pull RST output architecture that sustains valid logic states even when VCC collapses to 0V - provided VBAT remains active. This is achieved through internal charge-pump-assisted drive circuitry, allowing DS1836CS-10/T&R to hold RST low during full main-rail failure and release it cleanly once VCC recovers. No external pull-down resistor is required, though a 100kΩ resistor may be added to ensure robustness in zero-VCC edge cases.

What package type and tape-and-reel configuration does DS1836CS-10/T&R use?

DS1836CS-10/T&R is supplied in an 8-pin SOIC (SO-8) package with 150-mil body width and standard gull-wing leads, compliant with JEDEC MS-012. The "/T&R" suffix indicates tape-and-reel packaging: 2,500 units per reel, EIA-481-compliant carrier tape, and humidity-sensitive level 1 (non-dry-pack). This configuration supports automated SMT placement and is pin-compatible with all DS1836C/D variants in SO-8.