Analog Devices Inc./Maxim Integrated DS1233-10+

Overview

DS1233-10+ from Analog Devices is a 5V microprocessor supervisory circuit in TO-92 package that monitors VCC for ±10% tolerance (4.25V–4.49V trip point), asserts reset for 350ms after power recovery or pushbutton release, and integrates internal 5kΩ pull-up and precision temperature-compensated voltage reference. It serves as a cost-effective, single-chip reset generator in embedded microcontroller systems requiring reliable power-on and manual reset control.

For engineers reviewing the DS1233-10+ datasheet, DS1233-10+ pinout, DS1233-10+ application, or DS1233-10+ equivalent, key selection considerations include its fixed ±10% VCC threshold, 350ms reset timeout, TO-92 mechanical form factor, pushbutton debounce capability, and compatibility with 5V microprocessor supply rails in industrial and consumer electronics.

Technical Context

The DS1233-10+ implements dual-function supervision: first, a comparator-based VCC monitor using a precision temperature-compensated reference to detect out-of-tolerance conditions at 4.25V–4.49V; second, an edge-triggered, debounced pushbutton interface that forces a 350ms active-low reset pulse upon switch release.

Its internal architecture includes a 350ms delay timer, open-drain RST output with integrated 5kΩ pull-up, and input protection allowing VCC operation from 1.2V to 5.5V. The device operates across –40°C to +85°C and requires no external components beyond a 100pF–0.01μF capacitor on RST for proper pushbutton functionality.

Key Specifications

Pinout & Package

DS1233-10+ is supplied in a 3-pin TO-92 package (ordering suffix "+" denotes RoHS-compliant lead-free finish). Pin 1 = GROUND, Pin 2 = RESET (open-drain output), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G12DBVR, the DS1233-10+ uniquely combines fixed ±10% 5V supervision, integrated pushbutton debounce, and TO-92 packaging-making it optimal for cost-sensitive, space-constrained 5V microcontroller systems where manual reset is mandatory and no external configuration is desired.

Availability

DS1233-10+ is available at Aetrix Electronics and suitable for industrial PLC controllers, consumer set-top boxes, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole reset solutions.

Supply support for DS1233-10+ 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 DS1233-10+ belongs to the EconoReset family of supervisory circuits, designed specifically to replace discrete reset solutions in cost-driven 5V microcontroller applications with guaranteed timing, precision thresholds, and minimal external components.

FAQ

What is the exact VCC trip point range for DS1233-10+?

The DS1233-10+ has a guaranteed VCC trip point range of 4.25V to 4.49V, corresponding to ±10% tolerance around a nominal 5V supply. This specification is validated across –40°C to +85°C and is enabled by an internal precision temperature-compensated voltage reference. The DS1233-10+ uses this threshold to assert reset during brown-out and maintain it for 350ms after VCC returns to tolerance.

Does DS1233-10+ support pushbutton reset functionality?

Yes, DS1233-10+ integrates hardware pushbutton debounce and generates a clean 350ms active-low reset pulse upon button release. It monitors the RST pin for a falling edge, debounces the switch internally, and holds RST low for the full timeout. A 100pF–0.01μF capacitor between RST and ground is mandatory for correct operation of DS1233-10+ in pushbutton mode.

What package type is used for DS1233-10+?

DS1233-10+ is packaged in a 3-pin TO-92 case with formed leads, RoHS-compliant and marked with "+" suffix. This through-hole package supports legacy PCB assembly and provides mechanical robustness in vibration-prone environments. Pinout is standardized: Pin 1 = GROUND, Pin 2 = RESET (open-drain), Pin 3 = VCC.

Can DS1233-10+ operate with supply voltages below 5V?

Yes, DS1233-10+ functions with VCC as low as 1.2V, though its ±10% trip point (4.25V–4.49V) remains fixed and only valid when VCC reaches or exceeds ~4.0V. Below that, the reset output stays asserted. Its 50μA quiescent current and wide operating range make DS1233-10+ suitable for systems with variable or backup supplies, provided the 5V supervision function is active only during nominal operation.

Is there an internal pull-up resistor on the RST pin of DS1233-10+?

Yes, DS1233-10+ includes an internal pull-up resistor of 3.75kΩ to 6.25kΩ connected to the open-drain RST output. This eliminates the need for an external pull-up in basic applications, reducing BOM count and board area. When driving high-capacitance nodes or multiple loads, designers may still add an external pull-up per DS1233-10+ datasheet recommendations.