Analog Devices Inc./Maxim Integrated DS1233-15+T&R

Overview

DS1233-15+T&R from Analog Devices is a 5V microprocessor supervisory circuit with ±15% VCC trip point (4.0V–4.24V), 350ms reset pulse width, internal 5kΩ pull-up resistor, and TO-92 tape-and-reel packaging. It monitors power supply integrity and debounces external pushbutton resets in embedded control systems requiring reliable power-on and brownout reset.

For engineers reviewing the DS1233-15+T&R datasheet, DS1233-15+T&R pinout, DS1233-15+T&R application, or DS1233-15+T&R equivalent, key selection criteria include VCC trip accuracy (±15%), guaranteed 350ms reset assertion time, pushbutton debounce capability, operating temperature range (–40°C to +85°C), and TO-92 tape-and-reel availability for automated assembly.

Technical Context

The DS1233-15+T&R integrates a precision temperature-compensated voltage reference and comparator to detect VCC out-of-tolerance conditions at 4.0V–4.24V (15% tolerance). Upon detection, it asserts an active-low RESET signal and holds it for 350ms after VCC recovery or pushbutton release.

It supports dual-mode operation: autonomous power-monitoring reset and external pushbutton-initiated reset with internal debouncing. The RST pin serves as both output and input-monitoring for falling edges during normal operation and driving low for 350ms upon button release-with required external 100pF–0.01μF capacitor to ground.

Key Specifications

Pinout & Package

DS1233-15+T&R is supplied in a 3-pin TO-92 package with formed leads for tape-and-reel automated placement. Pin 1 is GROUND, Pin 2 is RESET (open-drain output/input), and Pin 3 is VCC. No fourth pin-SOT-223 variant has Pin 4 (GROUND), but TO-92 version does not.

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 DS1233-15+T&R uniquely combines fixed ±15% 5V monitoring, integrated pushbutton debounce, and TO-92 tape-and-reel packaging-making it optimal for cost-sensitive industrial controls where mechanical reset and compact through-hole assembly are priorities.

Availability

DS1233-15+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, smart metering modules, and embedded HVAC control boards requiring stable component supply with lead(Pb)-free compliance and full temperature-range qualification.

Supply support for DS1233-15+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 DS1233-15+T&R belongs to the EconoReset family of supervisory circuits designed specifically for cost-effective, reliable power-on and brownout reset in resource-constrained microprocessor systems.

FAQ

What is the exact VCC trip point range for DS1233-15+T&R?

The DS1233-15+T&R has a guaranteed VCC trip point range of 4.0V to 4.24V (±15% of nominal 5V), with typical value 4.125V. This range is validated across –40°C to +85°C and defines the voltage threshold at which the device asserts the RESET signal during power failure or brownout. The DS1233-15+T&R uses a precision temperature-compensated reference to maintain this tolerance over temperature and supply variation.

Does DS1233-15+T&R require an external capacitor on the RST pin?

Yes, DS1233-15+T&R requires an external capacitor between RST and ground-typically 100pF to 0.01μF-for proper pushbutton debounce operation. The capacitor stabilizes the RST line during mechanical switch transitions and enables the internal timing circuit to detect valid button release. Without it, DS1233-15+T&R may generate spurious or incomplete reset pulses. The DS1233-15+T&R datasheet specifies this as mandatory for pushbutton functionality.

What package type and lead form does DS1233-15+T&R use?

DS1233-15+T&R is packaged in a 3-pin TO-92 case with formed leads optimized for tape-and-reel automated insertion. It is RoHS-compliant (indicated by the "+" suffix) and features a standard TO-92 outline (Analog Devices package code Q3+4, outline no. 21-0250). Unlike the SOT-223 variant, DS1233-15+T&R has no fourth pin-only GROUND, RESET, and VCC terminals.

How long is the reset pulse generated by DS1233-15+T&R after VCC recovery?

After VCC returns to within the 4.0V–4.24V trip window, DS1233-15+T&R holds the RESET signal active for 250–450ms (typical 350ms), as specified in its AC electrical characteristics. This guaranteed minimum hold time ensures microprocessor and peripheral power rails fully stabilize before release. The same 350ms timing applies to pushbutton-initiated resets upon release, and DS1233-15+T&R enforces this independently of external conditions.

Can DS1233-15+T&R monitor a 3.3V supply?

No, DS1233-15+T&R is specifically calibrated for 5V systems with ±15% trip tolerance (4.0V–4.24V). For 3.3V monitoring, Analog Devices offers the DS1233A-15 variant, which has a 2.64V–2.80V trip range. Using DS1233-15+T&R on a 3.3V rail would result in continuous reset assertion, as 3.3V falls well below its 4.0V lower limit. Always match the DS1233-15+T&R part number suffix to the target supply voltage.