Analog Devices Inc./Maxim Integrated DS1233Z-5/T&R

Overview

DS1233Z-5/T&R from Analog Devices is a 5V microprocessor supervisory circuit in SOT-223 package that monitors VCC for out-of-tolerance conditions (trip point 4.50–4.75 V, ±5%), asserts reset for 350 ms after power recovery or pushbutton release, and integrates internal 5 kΩ pull-up and precision temperature-compensated voltage reference. It serves as a system-level power-on reset and manual reset controller in embedded microcontroller applications.

For engineers reviewing the DS1233Z-5/T&R datasheet, DS1233Z-5/T&R pinout, DS1233Z-5/T&R application, or DS1233Z-5/T&R equivalent, key selection criteria include VCC trip accuracy (±5%), guaranteed 350 ms reset pulse width, SOT-223 thermal performance, pushbutton debounce capability, and compatibility with 5 V microprocessor reset inputs requiring active-low assertion.

Technical Context

The DS1233Z-5/T&R implements dual-function supervision: precise VCC monitoring via a temperature-compensated bandgap reference and comparator, plus edge-triggered pushbutton reset control with hardware debouncing. Its internal 350 ms timer ensures deterministic reset hold time independent of external RC timing.

It operates over -40°C to +85°C, supports VCC from 1.2 V to 5.5 V, and features a dedicated ground pin (Pin 4) unique to the SOT-223 variant-enabling stable operation under noisy supply conditions without shared ground path interference.

Key Specifications

Pinout & Package

SOT-223 package with 4-pin configuration: compact surface-mount footprint (6.5 mm × 3.5 mm × 1.8 mm), thermally enhanced backside pad for improved heat dissipation in high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G33DBVR, the DS1233Z-5/T&R uniquely combines ±5% 5 V monitoring, 350 ms reset timing, and hardware pushbutton debounce in one SOT-223 device-making it optimal for cost-sensitive, space-constrained 5 V microcontroller systems requiring both power and manual reset functions.

Availability

DS1233Z-5/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, smart energy meters, and automotive infotainment head units requiring stable component supply and RoHS-compliant packaging.

Supply support for DS1233Z-5/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DS1233Z-5/T&R belongs to the EconoReset family of microprocessor supervisors, designed specifically for cost-effective, reliable power-on and manual reset control in 5 V embedded systems with minimal external components.

FAQ

What is the exact VCC trip point range for DS1233Z-5/T&R?

The DS1233Z-5/T&R has a guaranteed VCC trip point range of 4.50 V to 4.75 V, corresponding to its ±5% tolerance specification for nominal 5 V operation. This range is factory-trimmed and temperature-compensated, ensuring consistent detection across the full -40°C to +85°C operating temperature range. The DS1233Z-5/T&R uses an internal precision bandgap reference to maintain this accuracy without external calibration.

Does DS1233Z-5/T&R require an external capacitor for pushbutton operation?

Yes, DS1233Z-5/T&R requires a capacitor between 100 pF and 0.01 μF connected from the RST pin to ground for proper pushbutton debounce operation. In applications needing higher reset current drive, a minimum 500 pF capacitor plus a parallel 1 kΩ external pull-up resistor is recommended. The DS1233Z-5/T&R's internal 5 kΩ pull-up alone is insufficient for robust noise immunity in electrically noisy environments.

How does the SOT-223 package of DS1233Z-5/T&R differ from the TO-92 version?

The DS1233Z-5/T&R in SOT-223 has four pins-including a dedicated second ground (Pin 4)-whereas the TO-92 version has only three pins. The SOT-223's dual-ground structure isolates analog sensing ground from power return current, improving noise immunity. Its thermal pad also enables better heat dissipation than TO-92, making DS1233Z-5/T&R preferable for high-density or thermally demanding PCB layouts.

Can DS1233Z-5/T&R be used with 3.3 V microcontrollers?

No, DS1233Z-5/T&R is specified exclusively for 5 V systems, with a VCC trip point centered at 4.625 V (±5%). For 3.3 V microcontrollers, Analog Devices offers the DS1233A-5 series, which features a 2.72–2.97 V trip range. Using DS1233Z-5/T&R with a 3.3 V supply would result in continuous reset assertion, as the device detects the 3.3 V rail as severely out-of-tolerance.

What is the maximum sink current capability of the RST output in DS1233Z-5/T&R?

The RST output of DS1233Z-5/T&R can sink up to +8 mA while maintaining VOL ≤ 0.4 V, per its DC electrical specifications. This allows direct interfacing with standard 5 V microprocessor reset inputs without additional buffering. The DS1233Z-5/T&R achieves this with an open-drain NMOS output stage, and its internal 5 kΩ pull-up resistor is optional-external pull-ups may be used for stronger drive or different voltage levels.