Analog Devices Inc./Maxim Integrated DS1233-5

Overview

DS1233-5 from Analog Devices is a 5V microprocessor supervisory circuit that monitors V_CC for out-of-tolerance conditions, asserts a reset signal for 350ms after power recovery or pushbutton release, and features ±5% V_CC trip accuracy (4.50–4.75V), internal 5kΩ pull-up, and -40°C to +85°C operation. It serves as a low-cost, single-chip reset generator in embedded microcontroller systems requiring reliable power-on and manual reset control.

For engineers reviewing the DS1233-5 datasheet, DS1233-5 pinout, DS1233-5 application, or DS1233-5 equivalent, key selection considerations include its fixed 5% V_CC threshold, TO-92/SOT-223 package options, pushbutton debounce capability, 350ms reset timeout, and compatibility with 5V logic-level microprocessors in industrial and consumer control applications.

Technical Context

The DS1233-5 integrates a precision temperature-compensated voltage reference and comparator to detect V_CC deviations against a fixed ±5% tolerance window (4.50–4.75V at 5V nominal). Its internal 350ms delay timer ensures reset remains active during power stabilization and pushbutton release recovery.

It supports dual reset initiation modes: automatic power-fail detection and external pushbutton override with built-in debouncing. The RST pin functions bidirectionally-outputting active-low reset and accepting pushbutton input-requiring an external 100pF–0.01μF capacitor to ground for proper edge detection and timing.

Key Specifications

Pinout & Package

DS1233-5 is available in TO-92 (3-pin) and SOT-223 (4-pin) packages. The TO-92 variant uses pins 1 (GND), 2 (RST), and 3 (V_CC). The SOT-223 variant adds pin 4 (GND) for improved thermal and grounding performance.

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 provides a cost-optimized, fixed-threshold solution with integrated pushbutton handling and minimal external components-ideal for 5V-only applications where simplicity and proven reliability outweigh configurability needs.

Availability

DS1233-5 is available at Aetrix Electronics and suitable for industrial PLC controllers, consumer set-top boxes, medical infusion pumps, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for DS1233-5 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 belongs to the EconoReset family of supervisory circuits, designed specifically to replace discrete reset solutions in cost-sensitive 5V microprocessor systems with guaranteed timing and voltage accuracy.

FAQ

What is the exact V_CC trip point range for DS1233-5?

The DS1233-5 has a guaranteed V_CC trip point range of 4.50V (minimum) to 4.75V (maximum), corresponding to ±5% tolerance around a nominal 5V supply. This specification is validated across the full -40°C to +85°C operating temperature range and is based on the internal temperature-compensated voltage reference. The DS1233-5 does not require external calibration to meet this accuracy.

Does DS1233-5 support both power-on reset and manual pushbutton reset?

Yes, DS1233-5 supports dual-mode reset initiation: automatic power-on/power-fail reset triggered by V_CC deviation, and manual reset via external pushbutton connected to the RST pin. The device internally debounces the pushbutton and generates a precise 350ms active-low reset pulse upon release. An external 100pF–0.01μF capacitor between RST and ground is required for correct operation.

What package options are available for DS1233-5?

The DS1233-5 is offered in two RoHS-compliant packages: TO-92 (3-pin, through-hole) and SOT-223 (4-pin, surface-mount). The TO-92 version uses pins 1 (GND), 2 (RST), and 3 (V_CC). The SOT-223 version adds pin 4 (GND) for improved thermal performance and grounding. Both variants are available in tape-and-reel (T&R) format, including the DS1233-5+T&R ordering code.

Is an external pull-up resistor required for DS1233-5's RST pin?

No, an external pull-up resistor is not required for DS1233-5's RST pin because it integrates a factory-trimmed internal pull-up resistor of 3.75–6.25kΩ (typical 5kΩ). This feature eliminates the need for discrete components in standard configurations where the RST output drives an open-drain microprocessor reset input. External pull-ups may still be used if higher drive strength or different logic thresholds are needed.

How does DS1233-5 handle power-down sequencing?

During power-down, DS1233-5 asserts reset when V_CC falls below its 4.50–4.75V trip window and maintains the active-low reset signal until V_CC drops below 1.2V (absolute minimum rating). This ensures continuous reset assertion throughout the entire supply collapse, preventing undefined microprocessor states. The DS1233-5 does not require external capacitors or auxiliary supplies to sustain reset during brown-out.