Analog Devices Inc./Maxim Integrated DS1233-10+T&R

Overview

DS1233-10+T&R from Analog Devices is a 5V microprocessor supervisory circuit with ±10% VCC trip point (4.25V–4.49V), 350ms reset pulse width, internal 5kΩ pull-up resistor, and TO-92 tape-and-reel packaging. It monitors power supply integrity and debounces external pushbutton resets for embedded microcontroller systems requiring reliable power-on and brownout reset.

For engineers reviewing the DS1233-10+T&R datasheet, DS1233-10+T&R pinout, DS1233-10+T&R application, or DS1233-10+T&R equivalent, key selection criteria include VCC tolerance accuracy, reset timing stability over -40°C to +85°C, pushbutton debounce capability, internal pull-up integration, and TO-92 mechanical compatibility in space-constrained designs.

Technical Context

The DS1233-10+T&R implements dual-function supervision: precision voltage monitoring using a temperature-compensated reference and comparator, and active pushbutton reset control with hardware-based debouncing. Its reset assertion is triggered by VCC falling below 4.25V (min) or rising above 4.49V (max), with hysteresis inherent to the ±10% tolerance band.

Upon VCC recovery or pushbutton release, the device asserts RESET for a guaranteed 250–450ms (typ. 350ms), ensuring microprocessor stabilization. The RST pin serves as both open-drain output and input-sense node for external button detection, enabled by internal biasing and edge-triggered timing logic.

Key Specifications

Pinout & Package

DS1233-10+T&R is supplied in a 3-pin TO-92 package with formed leads for tape-and-reel automated assembly. 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 TPS3808G12DBVR, the DS1233-10+T&R uniquely integrates both precision ±10% 5V monitoring and hardware pushbutton debounce in a TO-92 package-reducing BOM count and eliminating firmware reset-handling complexity.

Availability

DS1233-10+T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply with RoHS-compliant TO-92 tape-and-reel delivery.

Supply support for DS1233-10+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 DS1233-10+T&R belongs to the EconoReset family of supervisory ICs designed specifically for cost-sensitive, space-constrained microcontroller systems needing robust power monitoring and user-reset capability without external passive components.

FAQ

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

The DS1233-10+T&R has a guaranteed VCC trip point range of 4.25V to 4.49V, corresponding to ±10% tolerance around nominal 5V. This specification is tested and characterized across the full -40°C to +85°C operating temperature range and defines the voltage window within which the device asserts RESET during power failure or brownout conditions. DS1233-10+T&R uses a precision temperature-compensated voltage reference to maintain this accuracy without external calibration.

Does DS1233-10+T&R require an external capacitor for pushbutton operation?

Yes, DS1233-10+T&R requires a capacitor of 100pF to 0.01μF connected between the RST pin and ground for proper pushbutton debounce operation. This capacitor works with the device's internal timing circuitry to filter mechanical switch bounce. For applications demanding higher reset current drive, a minimum 500pF capacitor plus an external 1kΩ pull-up resistor is recommended. DS1233-10+T&R does not function correctly with pushbuttons without this capacitor.

What package type and lead form does DS1233-10+T&R use?

DS1233-10+T&R is packaged in a 3-pin TO-92 case with formed leads optimized for tape-and-reel automated placement. Pin 1 is GROUND, Pin 2 is RESET (open-drain), and Pin 3 is VCC. The "+" suffix denotes RoHS-compliance, and "T&R" confirms tape-and-reel packaging. DS1233-10+T&R is not available in SOT-223 or other surface-mount variants-the TO-92 form factor is fixed for this ordering code.

How long is the reset pulse asserted after VCC returns to tolerance?

After VCC rises back into the ±10% tolerance band (4.25V–4.49V), DS1233-10+T&R holds the RESET pin low for 250–450ms (typical 350ms). This guaranteed minimum pulse width ensures microprocessor clocks, PLLs, and memory subsystems stabilize before release. The timing is generated by an internal RC oscillator and is independent of external components-DS1233-10+T&R delivers consistent reset duration across temperature and supply variations.

Can DS1233-10+T&R monitor 3.3V supplies?

No, DS1233-10+T&R is specifically designed for 5V systems and monitors VCC relative to a ±10% 5V threshold (4.25V–4.49V). It is not specified or characterized for 3.3V operation. For 3.3V applications, Analog Devices offers the DS1233A-10+ series with a 2.8V–2.97V trip point. Using DS1233-10+T&R on a 3.3V rail would result in continuous reset assertion, as VCC remains below the 4.25V lower trip limit. DS1233-10+T&R must be used only with nominal 5V power domains.