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

Overview

DS1233-15/T&R from Analog Devices is a precision 5V microprocessor supervisory circuit with 15% VCC trip point tolerance (4.0V–4.24V), 350ms reset pulse width, internal 5kΩ pull-up resistor, and pushbutton debounce functionality. It operates from -40°C to +85°C in TO-92 tape-and-reel packaging and is used in embedded systems requiring reliable power-on reset and manual reset recovery.

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 considerations include VCC trip accuracy (±15%), guaranteed 350ms reset assertion time, pushbutton interface compatibility, and TO-92 package suitability for cost-sensitive industrial control and legacy board designs.

Technical Context

The DS1233-15/T&R integrates a temperature-compensated voltage reference and comparator to monitor 5V supply integrity, asserting RESET when VCC falls below 4.0V (min) and holding it active for 250–450ms after VCC recovery. Its internal debouncing logic detects pushbutton release and generates a clean 350ms reset pulse without external RC timing components.

It features dual-mode operation: autonomous power-fail detection and externally triggered reset via the RST pin. The device uses a single ground-referenced VCC input and outputs an open-drain RESET signal compatible with TTL/CMOS logic, with VOL ≤0.4V at IOL = +8mA and ICC = 50μA typical quiescent current.

Key Specifications

Pinout & Package

DS1233-15/T&R is supplied in TO-92 package with formed leads for tape-and-reel automated assembly. Pin 1 = GROUND, Pin 2 = RESET (open-drain output), Pin 3 = VCC. No fourth pin - SOT-223 variant has Pin 4 = GROUND, but TO-92 version is strictly 3-pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G15DBVR, the DS1233-15/T&R delivers fixed 15%-tolerance 5V monitoring with longer 350ms reset hold and lower 50μA supply current - making it optimal for cost-constrained, through-hole, industrial 5V systems where minimal external components and deterministic timing are critical.

Availability

DS1233-15/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, legacy embedded instrumentation, point-of-sale terminals, and energy metering hardware requiring stable component supply and long-lifecycle support.

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 technologies, serving industrial, automotive, communications, and healthcare markets since 1965.

The DS1233-15/T&R belongs to the EconoReset family of supervisory ICs designed specifically for cost-sensitive, reliability-critical 5V microprocessor systems requiring precise power monitoring and pushbutton reset integration without external components.

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 (minimum) to 4.24V (maximum), corresponding to ±15% tolerance around 5V nominal. This specification is validated across the full -40°C to +85°C operating temperature range and is enabled by its internal temperature-compensated voltage reference. The DS1233-15/T&R does not require external calibration to maintain this accuracy.

Does DS1233-15/T&R require an external capacitor for pushbutton operation?

Yes - for proper pushbutton debounce, DS1233-15/T&R requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground. In applications demanding higher reset current drive, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended. This capacitor is essential for noise immunity and edge detection timing; omission will cause unreliable button response.

Is DS1233-15/T&R pin-compatible with other DS1233 variants?

Yes - all DS1233 variants (e.g., DS1233-5/T&R, DS1233-10/T&R) share identical TO-92 pinout: Pin 1 = GROUND, Pin 2 = RESET, Pin 3 = VCC. The only functional difference is the VCC trip point (5%, 10%, or 15%). Therefore, DS1233-15/T&R can be substituted for other DS1233 TO-92 versions without PCB changes, provided the 4.0V–4.24V threshold meets system requirements.

What is the maximum supply voltage the DS1233-15/T&R can tolerate?

The DS1233-15/T&R has an absolute maximum VCC rating of +7.0V, but its recommended DC operating condition specifies VCC = 5.0V ±10% (i.e., 4.5V to 5.5V). Operation above 5.5V may cause parametric shift or accelerated aging. The DS1233-15/T&R is not rated for continuous operation at 7.0V - that value applies only to short-duration transient stress conditions per Absolute Maximum Ratings.

How does DS1233-15/T&R handle reset timing during power-down events?

During power-down, DS1233-15/T&R asserts RESET when VCC crosses the 4.0V–4.24V trip threshold and maintains it until VCC falls below ~1.2V (absolute minimum supply). The DS1233-15/T&R guarantees tRPD ≤100ns delay from VCC crossing trip point to RST assertion, ensuring fast fault capture. This behavior prevents processor runaway during uncontrolled voltage decay.