Analog Devices Inc./Maxim Integrated DS1233-5/T&R

Overview

DS1233-5/T&R from Analog Devices is a 5V microprocessor supervisory circuit in TO-92 tape-and-reel packaging, providing precision power supply monitoring with ±5% VCC trip point (4.50–4.75 V), 350ms reset pulse width, internal 5kΩ pull-up resistor, and pushbutton debouncing for external reset control. It ensures reliable system initialization in embedded controllers, industrial PLCs, and battery-backed memory systems.

For engineers reviewing the DS1233-5/T&R datasheet, DS1233-5/T&R pinout, DS1233-5/T&R application, or DS1233-5/T&R equivalent, key selection criteria include VCC trip accuracy, reset timing stability over -40°C to +85°C, TO-92 mechanical compatibility, and integrated pushbutton debounce without external RC networks.

Technical Context

The DS1233-5/T&R implements dual-function supervision: first, a precision temperature-compensated voltage reference and comparator continuously monitor VCC against a fixed 5% tolerance threshold (4.625 V typical); second, it detects and debounces external pushbutton transitions on the RST pin using internal timing logic, generating a clean 350ms active-low reset pulse upon release.

Its architecture integrates reset assertion during power-up (350ms after VCC enters tolerance), power-down detection (RST asserted within 100ns of VCC falling below trip point), and pushbutton interface with defined PBDV (1.8–3.3 V) and PBRD (0.3–0.8 V) thresholds - all operating at ≤50 μA quiescent current.

Key Specifications

Pinout & Package

DS1233-5/T&R is supplied in a 3-pin TO-92 package with formed leads for tape-and-reel automated assembly. Pin 1 = GROUND, Pin 2 = RESET (active-low open-drain output), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G01DBVR, the DS1233-5/T&R uniquely combines 5V-specific ±5% accuracy, integrated pushbutton debounce, TO-92 form factor, and 350ms guaranteed reset hold - making it optimal for cost-sensitive, space-constrained 5V industrial controllers where manual reset reliability is critical.

Availability

DS1233-5/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded data loggers, and point-of-sale terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant TO-92 tape-and-reel packaging.

Supply support for DS1233-5/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 DS1233-5/T&R belongs to the EconoReset family of supervisory ICs designed specifically for cost-effective, reliable power-on reset and manual reset control in 5V microprocessor-based systems without requiring external passive components.

FAQ

What is the exact VCC trip point range for DS1233-5/T&R?

The DS1233-5/T&R has a specified VCC trip point range of 4.50 V to 4.75 V, corresponding to ±5% tolerance around a nominal 4.625 V threshold. This range is validated across the full -40°C to +85°C operating temperature and ensures reset assertion before 5V rail collapse compromises microprocessor integrity. The DS1233-5/T&R uses a precision temperature-compensated voltage reference to maintain this accuracy without external calibration.

Does DS1233-5/T&R require an external capacitor for pushbutton operation?

Yes, DS1233-5/T&R requires a capacitor between 100 pF and 0.01 μF connected from the RST pin to ground for proper pushbutton debounce operation. This capacitor works with the internal timing circuit to filter mechanical switch bounce. For applications needing higher reset sink current, a minimum 500 pF capacitor plus an external 1 kΩ pull-up resistor is recommended. The DS1233-5/T&R does not function correctly with pushbuttons without this capacitor.

What is the reset output configuration of DS1233-5/T&R?

The DS1233-5/T&R features an active-low open-drain RESET output on Pin 2. It can drive standard microprocessor reset inputs directly when used with its internal 5 kΩ pull-up resistor or an external pull-up. The output sinks up to +8 mA at 0.4 V and supports interfacing with both 3.3V and 5V logic families. This configuration allows wired-OR reset bus architectures and avoids contention during power-up sequencing - a core design feature of the DS1233-5/T&R.

Can DS1233-5/T&R operate with supply voltages other than 5V?

The DS1233-5/T&R is specified for 5V ±10% operation (4.5–5.5 V) and calibrated for ±5% trip accuracy at 5V nominal. While absolute maximum ratings allow VCC as low as 1.2 V, the 4.50–4.75 V trip window is only guaranteed within the 5V ±10% range. Using DS1233-5/T&R outside this range risks inaccurate reset triggering. For non-5V systems, Analog Devices offers DS1233A-x variants (3.3V) or DS1233Z-x (SOT-223) - but DS1233-5/T&R itself is strictly a 5V supervisor.

Is DS1233-5/T&R RoHS-compliant and lead-free?

Yes, DS1233-5/T&R is RoHS-compliant and lead-free, indicated by the "+" suffix in its ordering code per Analog Devices' packaging nomenclature. The TO-92 package meets JEDEC standards and is qualified for reflow soldering at 260°C for 10 seconds. Full compliance documentation, including material declarations and test reports, is available through Analog Devices' quality portal - confirming DS1233-5/T&R meets EU RoHS Directive 2011/65/EU and related substance restrictions.