Analog Devices Inc./Maxim Integrated DS1233D-5

Overview

DS1233D-5 from Maxim Integrated (now Analog Devices) is a 5V microprocessor supervisory circuit that monitors V_CC, asserts an active-low reset signal on power failure or brownout, and holds reset for 350 ms after V_CC recovers to tolerance. It features ±5% V_CC trip point (4.5–4.75 V), internal 5 kΩ pull-up resistor, and operates from –40°C to +85°C. Used in embedded controllers requiring reliable power-on reset and supply monitoring.

For engineers reviewing the DS1233D-5 datasheet, DS1233D-5 pinout, DS1233D-5 application, or DS1233D-5 equivalent, key selection criteria include V_CC trip accuracy, reset timeout duration, package compatibility (TO-92 or SOT-223), operating temperature range, and compatibility with Motorola 68XXX/HC16 microprocessors.

Technical Context

The DS1233D-5 implements a precision temperature-compensated voltage reference and comparator to detect V_CC deviations beyond its ±5% threshold. Its internal power-fail logic forces RST low immediately upon out-of-tolerance detection and sustains it for 250–450 ms (typ. 350 ms) after V_CC returns to spec.

It delivers a push-pull output with 0.4 V max low-level voltage and +8 mA sink capability, eliminating external pull-up requirements in most designs. The device requires no external components for basic operation and supports fast V_CC slew rate detection (t_RPD = 100 ns).

Key Specifications

Pinout & Package

DS1233D-5 is available in TO-92 (3-pin) and SOT-223 (4-pin) packages. The SOT-223 variant includes an additional ground terminal (Pin 4) for improved thermal and noise performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G12DBVR, DS1233D-5 offers tighter 5 V trip accuracy (±5%), longer guaranteed reset hold (250–450 ms), and integrated pull-up-making it optimal for cost-sensitive, fixed 5 V industrial controllers where minimal external components and deterministic timing are critical.

Availability

DS1233D-5 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, smart energy meters, and point-of-sale terminals requiring stable component supply across long production lifecycles.

Supply support for DS1233D-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

Maxim Integrated, now part of Analog Devices, designs high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DS1233D-5 belongs to Maxim's EconoReset™ family of supervisory circuits, engineered specifically for cost-effective, reliable power-on reset and brownout protection in 5 V microprocessor systems with minimal external components.

FAQ

What is the exact V_CC trip point range for DS1233D-5?

The DS1233D-5 has a guaranteed V_CC trip point range of 4.5 V to 4.75 V, corresponding to ±5% tolerance around 5 V nominal. This specification is tested and characterized across –40°C to +85°C and is documented in the DC Electrical Characteristics table of the official DS1233D datasheet. The typical trip point is 4.625 V, and this accuracy eliminates the need for calibration in standard 5 V embedded designs.

Does DS1233D-5 require an external pull-up resistor on the RESET pin?

No, DS1233D-5 includes an internal pull-up resistor ranging from 3.75 kΩ to 6.25 kΩ, enabling direct connection to most microprocessor reset inputs without external components. This feature reduces bill-of-materials count and PCB area. However, if the target microcontroller requires stronger pull-up strength or operates outside standard TTL/CMOS thresholds, a supplemental external resistor may be added-but it is not required for baseline DS1233D-5 functionality.

How long does DS1233D-5 hold the RESET signal active after V_CC recovers?

DS1233D-5 holds the RESET signal active for 250–450 ms after V_CC returns to within its ±5% trip window, with a typical duration of 350 ms. This guaranteed minimum timeout ensures adequate stabilization time for both the 5 V power supply and the connected microprocessor's internal clocks and PLLs before release from reset. The timing is internally generated and independent of external capacitors.

Is DS1233D-5 compatible with 3.3 V microcontrollers?

Yes, DS1233D-5 is compatible with 3.3 V microcontrollers because its RESET output drives low to ≤0.4 V at 8 mA sink current-well below the 0.8 V maximum VIH threshold for standard 3.3 V CMOS inputs. Although DS1233D-5 monitors a 5 V supply, its active-low open-drain/push-pull output interfaces safely with 3.3 V logic. No level shifter is needed when connecting DS1233D-5 to 3.3 V MCUs like STM32F or NXP Kinetis families.

What package options are available for DS1233D-5?

DS1233D-5 is offered in two industry-standard packages: TO-92 (3-pin through-hole) and SOT-223 (4-pin surface-mount). The SOT-223 variant includes a dedicated second ground pin (Pin 4) for enhanced thermal performance and lower ground impedance. Both packages share identical electrical specifications and pin functions for Pins 1–3 (GND, RESET, V_CC), enabling direct substitution in layouts supporting either form factor.