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, asserts reset for 350ms after power recovery or pushbutton release, and features internal 5kΩ pull-up, precision temperature-compensated voltage reference, and ±5% VCC trip point (4.50–4.75V). It serves in embedded systems requiring reliable power-on reset and manual reset debouncing.

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 350ms reset pulse width, SOT-223 thermal performance, pushbutton debounce capability, and compatibility with 5V microcontroller reset inputs.

Technical Context

The DS1233Z-5+T&R integrates a precision temperature-compensated voltage reference and comparator to monitor VCC against a fixed 4.625V nominal threshold (±5%). It generates an active-low reset signal on power-up, power-down, or external pushbutton release - all with a fixed 350ms assertion time.

Its internal 5kΩ pull-up resistor enables direct connection to pushbutton switches without external components, and its RST pin functions as both output and input: it drives reset low during fault or button release, and detects falling edges for external override initiation.

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount, thermally enhanced, with exposed thermal pad (pin 4 = GND). Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC, Pin 4 = GND (dedicated thermal ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SUT+T and TPS3808G33DBVR, the DS1233Z-5+T&R uniquely combines 5V-specific ±5% trip accuracy, built-in pushbutton debounce, internal 5kΩ pull-up, and fixed 350ms reset timing in a thermally robust SOT-223 package - making it optimal for cost-sensitive, space-constrained 5V embedded systems requiring both power and manual reset supervision.

Availability

DS1233Z-5+T&R is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, point-of-sale terminals, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.

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 supervisory circuits, designed specifically for cost-effective, reliable power-on and manual reset generation in 5V embedded systems.

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 4.50V to 4.75V (±5% around 4.625V nominal), verified per Analog Devices' DS1233 datasheet Rev 2. This range ensures reset assertion before most 5V microcontrollers drop below their minimum operating voltage. The DS1233Z-5+T&R uses a precision temperature-compensated reference to maintain this accuracy across -40°C to +85°C.

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

Yes - a capacitor between 100pF and 0.01μF must be connected from the RST pin to ground for proper pushbutton debounce operation in the DS1233Z-5+T&R. This capacitor stabilizes the RST line during switch transitions. For applications needing higher reset sink current, a minimum 500pF capacitor plus an external 1kΩ pull-up resistor is recommended. The DS1233Z-5+T&R does not function correctly with pushbuttons without this capacitor.

Is DS1233Z-5+T&R pin-compatible with DS1233-5+T&R?

No - the DS1233Z-5+T&R (SOT-223, 4-pin) is not pin-compatible with the DS1233-5+T&R (TO-92, 3-pin). The SOT-223 variant adds a dedicated thermal ground pin (Pin 4), while the TO-92 version has only GND, RESET, and VCC. PCB layout and footprint must be redesigned when switching between these packages. The DS1233Z-5+T&R retains identical electrical behavior but requires different land patterns and thermal management.

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

The DS1233Z-5+T&R RST output can sink up to +8mA while maintaining VOL ≤ 0.4V, as specified in its DC Electrical Characteristics table. This allows direct driving of standard CMOS and TTL reset inputs without additional buffering. The DS1233Z-5+T&R achieves this with an open-drain NMOS output stage and is rated for continuous operation under this load across its full -40°C to +85°C temperature range.

Can DS1233Z-5+T&R monitor 3.3V supplies?

No - the DS1233Z-5+T&R is specifically configured for 5V supply monitoring with a ±5% trip point centered at 4.625V. For 3.3V systems, Analog Devices offers the DS1233A-5+ series (e.g., DS1233A-5+T&R), which has a 3.3V-specific trip range of 2.64V–2.80V. Using the DS1233Z-5+T&R on a 3.3V rail would result in permanent reset assertion, as VCC remains far below its 4.50V minimum trip threshold.