Analog Devices Inc./Maxim Integrated DS1233AZ-15

Overview

DS1233AZ-15 from Maxim Integrated is a 3.3V precision voltage-monitoring microprocessor reset supervisor IC with pushbutton debounce, 2.72V typical VCC trip point (±15% tolerance), 350ms reset pulse width, and TO-92 package. It monitors power supply integrity and external reset button activity in embedded microcontroller systems requiring reliable power-on and brownout reset.

For engineers reviewing the DS1233AZ-15 datasheet, DS1233AZ-15 pinout, DS1233AZ-15 application, or DS1233AZ-15 equivalent, key selection factors include its 2.64–2.80V trip window, internal 5kΩ pull-up resistor, -40°C to +85°C operating range, pushbutton debouncing capability, and guaranteed 350ms reset assertion after power recovery or button release.

Technical Context

The DS1233AZ-15 integrates a precision temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions at 3.3V ±15%. Its internal circuitry asserts RESET low when VCC drops below ~2.72V and holds it active for 350ms after VCC returns to spec or after pushbutton release.

It supports dual-mode operation: autonomous power-fail detection and edge-triggered pushbutton reset with hardware debouncing. The RST pin serves as both output and input-monitoring its own signal for falling/rising edges to initiate and terminate manual reset pulses without external logic.

Key Specifications

Pinout & Package

DS1233AZ-15 is supplied in a 3-pin TO-92 package (package code Q3+1), with leads arranged in straight-line configuration. Pin 1 is GROUND, Pin 2 is RESET (open-drain output/input), and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G15DBVR, the DS1233AZ-15 uniquely combines fixed ±15% 3.3V monitoring, integrated pushbutton debounce, and TO-92 through-hole compatibility-making it optimal for cost-sensitive, space-tolerant industrial controls where manual reset is mandatory.

Availability

DS1233AZ-15 is available at Aetrix Electronics and suitable for industrial control panels, medical handheld diagnostics, smart energy meters, and automotive body electronics requiring stable component supply across extended production lifecycles.

Supply support for DS1233AZ-15 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, communications, and computing applications.

The DS1233A family delivers cost-optimized, single-chip reset supervision for 3.3V and 5V microprocessor systems-emphasizing reliability, minimal external components, and robust operation in harsh environments.

FAQ

What is the exact VCC trip voltage range for DS1233AZ-15?

The DS1233AZ-15 has a guaranteed VCC trip point range of 2.64V to 2.80V at +25°C, corresponding to 3.3V ±15% tolerance. This window remains stable across the full -40°C to +85°C operating temperature range due to its internal temperature-compensated voltage reference. The DS1233AZ-15 uses this threshold to assert RESET during brownout events and ensure clean processor restart.

Does DS1233AZ-15 require an external capacitor for pushbutton operation?

Yes, DS1233AZ-15 requires a capacitor between 100pF and 0.01µF connected from the RESET pin to ground to enable hardware debounce of the pushbutton switch. This capacitor sets the internal timing for detecting switch release and generating the 350ms reset pulse. Without it, the DS1233AZ-15 cannot reliably distinguish mechanical bounce from true button press/release events.

Can DS1233AZ-15 operate with supply voltages other than 3.3V?

Yes, DS1233AZ-15 supports VCC from 1.2V to 5.5V per absolute maximum ratings, but its voltage-monitoring function is factory-trimmed for 3.3V ±15% operation. At non-3.3V supplies, the trip point remains fixed at ~2.72V nominal-so it can monitor lower-voltage rails (e.g., 2.5V) only if their dropout falls within the 2.64–2.80V window. The DS1233AZ-15 does not adapt its threshold dynamically.

What is the purpose of the internal 5kΩ pull-up resistor in DS1233AZ-15?

The internal 5kΩ pull-up resistor in DS1233AZ-15 biases the RESET pin high when no external switch is active, eliminating the need for an external pull-up component. This simplifies PCB layout and reduces BOM count. During pushbutton operation, the DS1233AZ-15 actively pulls RESET low to generate the reset pulse-overriding the internal pull-up-and releases it only after the 350ms timer expires.

How does DS1233AZ-15 differ from DS1233A-15 in marking or specification?

DS1233AZ-15 is the TO-92 packaged variant of the DS1233A-15 device, with "Z" denoting the TO-92 package per Maxim's packaging nomenclature. Both share identical electrical specifications-including 2.64–2.80V trip point, 350ms reset timeout, and pushbutton debounce behavior. The DS1233AZ-15 specifically references the Q3+1 TO-92 outline and is optimized for through-hole assembly in legacy or high-reliability industrial designs.