Analog Devices Inc./Maxim Integrated DS1233D-15+T&R

Overview

DS1233D-15+T&R from Maxim Integrated (now Analog Devices) is a precision 5V microprocessor supervisory circuit with 15% V_CC trip point (4.0–4.24 V), 350 ms reset pulse width, and internal 5 kΩ pull-up resistor. It monitors power supply integrity and asserts an active-low RESET signal during out-of-tolerance conditions, used in embedded control systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the DS1233D-15+T&R datasheet, DS1233D-15+T&R pinout, DS1233D-15+T&R application, or DS1233D-15+T&R equivalent, key selection criteria include confirmed 15% V_CC threshold accuracy, guaranteed 250–450 ms reset timeout, SOT-223 package compatibility, -40°C to +85°C operation, and compatibility with Motorola 68XXX and HC16 microprocessors.

Technical Context

The DS1233D-15+T&R implements a temperature-compensated voltage reference and comparator to detect V_CC droop below 4.125 V (typical), triggering an active-low RESET output. Its internal timing circuit holds RESET asserted for 350 ms after V_CC recovery, independent of external components.

It operates with no external capacitors or resistors required for basic reset generation, integrates a 5 kΩ internal pull-up on the RESET pin, and supports both power-up and power-down reset assertion with nanosecond-level detection latency (t_RPD = 100 ns).

Key Specifications

Pinout & Package

SOT-223 surface-mount package with 4-pin configuration (Pin 4 is GND; Pin 1 and Pin 4 are both ground for thermal and noise immunity). Compact footprint suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX691ACSA+ and TPS3808G15DBVR, the DS1233D-15+T&R delivers factory-calibrated 15% V_CC detection with no external components, making it optimal for cost-sensitive, high-volume 5V microcontroller reset applications where simplicity and proven reliability outweigh feature expansion or ultra-low I_Q.

Availability

DS1233D-15+T&R is available at Aetrix Electronics and suitable for industrial control panels, medical instrumentation, automotive body electronics, and point-of-sale terminals requiring stable component supply and long-term manufacturability.

Supply support for DS1233D-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

Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing applications.

The DS1233D-15+T&R belongs to the EconoReset™ family of supervisory circuits, engineered specifically for cost-effective, single-function power monitoring and reset generation in resource-constrained embedded systems.

FAQ

What is the exact V_CC trip point range for DS1233D-15+T&R?

The DS1233D-15+T&R has a factory-trimmed V_CC trip point range of 4.0 V to 4.24 V (15% tolerance around 5V), with typical value 4.125 V. This is specified in the DC Electrical Characteristics table under VCCTP3 parameter and confirmed in the EconoReset Selection Guide. The DS1233D-15+T&R uses internal temperature-compensated reference circuitry to maintain this accuracy across -40°C to +85°C.

Does DS1233D-15+T&R require an external pull-up resistor on the RESET pin?

No, the DS1233D-15+T&R includes an internal pull-up resistor of 3.75–6.25 kΩ on the RESET pin, eliminating the need for an external component in standard configurations. This is explicitly stated in the FEATURES section and verified in the DC Electrical Characteristics table under "Internal Pull-Up Resistor" (R_P). The DS1233D-15+T&R's open-drain RESET output remains compatible with microcontrollers requiring externally pulled-up reset inputs.

What is the guaranteed reset pulse width for DS1233D-15+T&R?

The DS1233D-15+T&R guarantees a reset pulse width (t_RST) of 250 ms minimum to 450 ms maximum, with typical value 350 ms. This timing is internally generated and independent of external components. The DS1233D-15+T&R maintains RESET active for this full duration after V_CC returns to tolerance, ensuring adequate stabilization time for microprocessors and supporting circuitry per the OPERATION – POWER MONITOR description.

Is DS1233D-15+T&R compatible with 3.3V microcontrollers?

The DS1233D-15+T&R is designed to monitor a 5V supply and assert RESET when that rail drops below ~4.125 V; its RESET output is open-drain and logic-level compatible with 3.3V I/O when pulled up to 3.3V. However, the DS1233D-15+T&R itself requires V_CC = 5V ±10% to operate - it does not function from a 3.3V supply. For true 3.3V system supervision, DS1233A-15 is the designated variant.

What package type is used for DS1233D-15+T&R?

The DS1233D-15+T&R is supplied in the SOT-223 surface-mount package, as confirmed by the PIN ASSIGNMENT diagram labeled "SOT-223 PACKAGE" and the "Low-cost TO-92 package or surface mount SOT-223 package" feature statement. The SOT-223 variant has four pins (including dual ground), distinct from the 3-pin TO-92 version. The "+T&R" suffix indicates tape-and-reel packaging for automated assembly.