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

Overview

DS1233-5+T&R from Analog Devices is a 5V microprocessor supervisory circuit that monitors VCC for out-of-tolerance conditions and provides pushbutton reset control. It features a 4.50–4.75V trip point (5% tolerance), 350ms reset pulse width, internal 5kΩ pull-up resistor, and operates from –40°C to +85°C in TO-92 tape-and-reel packaging. It is used in embedded systems requiring reliable power-on and manual reset sequencing.

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, pushbutton debounce capability, TO-92 mechanical compatibility, and RoHS-compliant tape-and-reel delivery for automated assembly.

Technical Context

The DS1233-5+T&R integrates a precision temperature-compensated voltage reference and comparator to detect VCC deviations against a 4.625V nominal threshold (±5%). Its internal 350ms delay timer ensures reset remains active after power recovery or pushbutton release, preventing premature processor execution.

It supports dual-mode operation: autonomous power-fail detection and external pushbutton interface with built-in debouncing logic. The RST pin serves as both open-drain reset output and input-sense node, requiring an external 100pF–0.01μF capacitor to ground for proper button timing and noise immunity.

Key Specifications

Pinout & Package

DS1233-5+T&R is supplied in a 3-pin TO-92 package with formed leads, optimized for through-hole insertion and tape-and-reel automated handling. Pin 1 = GROUND, Pin 2 = RESET (open-drain output/input), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G01DBVR, the DS1233-5+T&R uniquely combines precise 5V supervision, pushbutton interface, and internal debounce in a single TO-92 device-reducing component count where manual reset and power fail detection are both required.

Availability

DS1233-5+T&R is available at Aetrix Electronics and suitable for industrial control, point-of-sale terminals, medical handhelds, and smart energy meters requiring stable component supply and RoHS-compliant 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 circuits designed specifically for cost-sensitive, space-constrained microprocessor systems needing guaranteed power-on reset and field-serviceable manual reset capability.

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 4.50V to 4.75V, corresponding to a ±5% tolerance around the nominal 4.625V threshold. This range is guaranteed over the full –40°C to +85°C operating temperature and is derived from its precision temperature-compensated voltage reference. The DS1233-5+T&R uses this window to assert reset reliably during brownout events.

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

Yes, DS1233-5+T&R requires an external capacitor between the RST pin and ground for proper pushbutton functionality. The datasheet specifies a value between 100pF and 0.01μF; for applications needing higher reset current, a minimum of 500pF with a parallel 1kΩ external pull-up resistor is recommended. This capacitor is essential for debouncing and timing control in DS1233-5+T&R's pushbutton mode.

What package type and lead form does DS1233-5+T&R use?

DS1233-5+T&R is packaged in a 3-pin TO-92 case with formed leads, supplied in tape-and-reel format for automated PCB assembly. The "+" suffix indicates RoHS compliance, and "T&R" explicitly denotes tape-and-reel packaging. Pin 1 is GROUND, Pin 2 is RESET, and Pin 3 is VCC - matching the standard TO-92 pinout defined in Analog Devices' mechanical drawings.

How long is the reset pulse generated by DS1233-5+T&R after power recovery?

After VCC returns to an in-tolerance condition, DS1233-5+T&R maintains the reset signal active for 250–450ms, with a typical duration of 350ms. This fixed delay is implemented by an internal timer and ensures sufficient stabilization time for the microprocessor's clock circuitry and internal registers before release. The DS1233-5+T&R guarantees this timing across temperature and supply variations.

Can DS1233-5+T&R monitor a 3.3V supply?

No, DS1233-5+T&R is specifically configured for 5V supervision with a 4.50–4.75V trip point. For 3.3V systems, Analog Devices offers the DS1233A-5 variant, which has a 2.88–2.97V trip point (±5% of 3.0V). Using DS1233-5+T&R on a 3.3V rail would result in continuous reset assertion since VCC remains below the minimum trip threshold of 4.50V.