Analog Devices Inc./Maxim Integrated DS1836AS-10+

Overview

DS1836AS-10+ from Maxim Integrated is a 5V microprocessor supervisory circuit with power-switching, non-maskable interrupt (NMI), and precision reset generation. It monitors VCC for out-of-tolerance conditions, asserts RST for 350ms after recovery, switches VOUT between VCC and VBAT at 4.25V–4.50V trip points, and triggers NMI when IN falls below 1.25V - ideal for PIC-based embedded systems with dual-supply backup.

For engineers reviewing the DS1836AS-10+ datasheet, DS1836AS-10+ pinout, DS1836AS-10+ application, or DS1836AS-10+ equivalent, key selection criteria include its 4.25V–4.50V VCC reset threshold, push-pull RST output, 1.25V IN trip point, 350ms reset timeout, and 8-pin SO package compatibility with legacy DIP footprints.

Technical Context

The DS1836AS-10+ integrates three co-located functions: a precision voltage monitor with temperature-compensated bandgap reference, a bidirectional power switch that transitions VOUT between VCC and VBAT at defined hysteresis thresholds (VCCRTP = 3.90–4.0V, VCCFTP = 3.80–3.9V), and an independent high-impedance sense input (IN) with fixed 1.25V comparator threshold.

Its RST output uses a push-pull structure enabling valid logic levels down to 0V VCC, while NMI is open-drain requiring external pull-up. The device operates across -40°C to +85°C and maintains functional outputs as long as any supply exceeds 1.2V - with RST remaining active during VCC transients and power-up sequencing.

Key Specifications

Pinout & Package

DS1836AS-10+ is housed in an 8-pin SOIC (150-mil width) package compatible with standard surface-mount assembly processes and footprint-equivalent to 8-pin DIP layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX692AESA+ and TPS3823-50DBVR, DS1836AS-10+ uniquely integrates power switching, NMI, and push-pull reset in one SO-8 device - delivering system-level power resilience without discrete FETs, comparators, or additional timing components.

Availability

DS1836AS-10+ is available at Aetrix Electronics and suitable for industrial PLC controllers, PIC-based data loggers, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for DS1836AS-10+ 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, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The DS1836AS-10+ belongs to Maxim's MicroManager family of supervisory circuits engineered specifically for dual-supply microprocessor systems needing coordinated reset, power switchover, and predictive fault signaling.

FAQ

What is the exact VCC reset threshold range for DS1836AS-10+?

The DS1836AS-10+ has a specified VCC reset threshold of 4.25V (min), 4.37V (typ), and 4.50V (max). This tolerance band ensures robust brownout detection in 5V systems while accommodating manufacturing variation and temperature drift. The "-10" suffix denotes this specific 4.37V nominal trip point, distinguishing it from DS1836AS-05 (4.63V) and DS1836AS-20 (4.0V) variants. DS1836AS-10+ maintains this specification across its full -40°C to +85°C operating range.

Does DS1836AS-10+ support true 0V-valid reset signaling?

Yes, DS1836AS-10+ features a push-pull RST output capable of maintaining a valid logic-low state even when VCC drops to 0V. This is achieved through internal charge-pump-assisted drive circuitry, unlike open-drain alternatives requiring external pull-ups. The design allows DS1836AS-10+ to assert a deterministic reset condition during catastrophic power loss - critical for preserving register states and preventing metastability in microcontrollers. A 100kΩ pull-down resistor may be added to ensure fast release when VCC returns.

How does the NMI function work in DS1836AS-10+ and what external components are needed?

The NMI output in DS1836AS-10+ is an open-drain signal triggered when the voltage at the IN pin falls below 1.25V. Since IN is high-impedance, users implement a resistor divider from a monitored rail (e.g., 12V or 5V) to ground to scale voltage to the 1.25V threshold. NMI requires a 10kΩ external pull-up resistor to VCC or VBAT to establish a logic-high idle state. No other passive components are mandatory, though layout best practices recommend local decoupling near IN and NMI pins to suppress noise-induced false triggers.

Can DS1836AS-10+ switch between VCC and VBAT supplies automatically, and what are the transition voltages?

Yes, DS1836AS-10+ performs automatic bidirectional power switching between VCC and VBAT on the VOUT pin. When VCC rises above 3.90–4.0V (VCCRTP), VOUT switches from VBAT to VCC. When VCC falls below 3.80–3.9V (VCCFTP), VOUT switches back to VBAT - with 0.1V hysteresis preventing oscillation. This behavior is inherent to the DS1836A/B series and requires no configuration. VOUT delivers VCC − 0.3V or VBAT − 0.3V under load, supporting up to 100mA total output current.

Is DS1836AS-10+ compatible with 3.3V microcontrollers despite being a 5V-oriented part?

DS1836AS-10+ is designed for 5V systems and specifies a 4.25–4.50V reset threshold - making it unsuitable for direct use with 3.3V microcontrollers expecting reset assertion below 3.3V. Its VCC supply range (1.2–5.5V) permits operation from 3.3V, but the reset threshold remains fixed at ~4.37V. For 3.3V applications, DS1836CS-10+ (2.88V threshold) or DS1836CS-20+ (2.72V) are appropriate variants. Using DS1836AS-10+ on a 3.3V rail would prevent reset assertion entirely, as VCC never reaches the trip point.