Analog Devices Inc./Maxim Integrated DS1233Z-15+

Overview

DS1233Z-15+ from Analog Devices is a precision 5V microprocessor supervisory circuit in SOT-223 package, providing 15% VCC trip point (4.0V–4.24V), 350ms reset pulse width, internal 5kΩ pull-up, and pushbutton debounce. It monitors power integrity and enables manual reset in embedded control systems requiring reliable cold-start and brownout recovery.

For engineers reviewing the DS1233Z-15+ datasheet, DS1233Z-15+ pinout, DS1233Z-15+ application, or DS1233Z-15+ equivalent, key selection criteria include VCC trip accuracy, reset timing stability over -40°C to +85°C, SOT-223 footprint compatibility, and integrated pushbutton interface with external capacitor support (100pF–0.01μF).

Technical Context

The DS1233Z-15+ implements dual-function supervision: precision voltage monitoring via temperature-compensated reference and comparator, plus edge-triggered pushbutton reset with hardware debouncing. Its reset assertion logic combines power-fail detection and release-edge timing, both enforced by a fixed 350ms delay block.

It operates as a standalone reset generator-no external components required for basic function-using internal biasing, reference, and timing. The SOT-223 variant includes Pin 4 as ground, distinguishing it electrically and mechanically from the TO-92 version.

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount, thermally enhanced, with exposed thermal pad (not electrically connected). Pin 4 is dedicated ground, enabling lower impedance return path vs. 3-pin TO-92.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G15DBVR, the DS1233Z-15+ uniquely integrates pushbutton debounce and fixed 350ms reset timing in a 4-pin SOT-223, eliminating external passive components while supporting both power-fail and manual reset in a single IC.

Availability

DS1233Z-15+ is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, smart metering, and automotive body electronics requiring stable component supply and long-term lifecycle support.

Supply support for DS1233Z-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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DS1233Z-15+ belongs to the EconoReset™ family of supervisory circuits, designed specifically for cost-sensitive, space-constrained embedded systems needing reliable power-on and brownout reset without external components.

FAQ

What is the exact VCC trip point range for DS1233Z-15+?

The DS1233Z-15+ has a guaranteed VCC trip point range of 4.0V to 4.24V, corresponding to ±15% tolerance on a nominal 5V supply. This range is specified at -40°C to +85°C and is maintained by an internal temperature-compensated voltage reference. The DS1233Z-15+ uses this threshold to assert reset during brownout conditions and ensure clean microprocessor startup.

Does DS1233Z-15+ require an external capacitor for pushbutton operation?

Yes, DS1233Z-15+ requires an external capacitor between the RESET pin and ground for proper pushbutton functionality. The datasheet specifies 100pF to 0.01μF; for higher reset current demands, a minimum of 500pF with a parallel 1kΩ external pull-up is recommended. This capacitor works with the internal debounce circuitry to filter switch bounce and enable reliable edge detection in the DS1233Z-15+.

How does the DS1233Z-15+ handle reset timing during power-up versus power-down?

The DS1233Z-15+ asserts reset for approximately 350ms after VCC rises into tolerance (power-up) and holds reset active for ~350ms after VCC falls out of tolerance (power-down). Both delays are generated by the same internal timer block and are independent of supply slew rate. This consistent timing behavior ensures predictable microprocessor initialization and shutdown sequencing in the DS1233Z-15+.

Is the DS1233Z-15+ RoHS-compliant and lead-free?

Yes, the DS1233Z-15+ is RoHS-compliant and lead-free, indicated by the "+" suffix in the part number. It meets EU RoHS Directive 2011/65/EU requirements and is manufactured using lead-free soldering processes compatible with 260°C reflow profiles. This compliance applies to both the DS1233Z-15+ and DS1233Z-15+T&R tape-and-reel packaging variants.

What is the purpose of Pin 4 on the DS1233Z-15+ SOT-223 package?

Pin 4 on the DS1233Z-15+ SOT-223 package is a dedicated ground terminal, distinct from Pin 1. It provides a low-inductance return path for internal circuitry and improves noise immunity-especially critical in electrically noisy environments like motor drives or automotive systems. This dual-ground configuration is unique to the SOT-223 variant and is not present in the 3-pin TO-92 versions of the DS1233 series.