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

Overview

DS1233-10/T&R from Analog Devices is a 5V microprocessor supervisory circuit in TO-92 package that monitors VCC for ±10% tolerance (4.25V–4.49V trip range), 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 system-level power-fail detector and manual reset controller in embedded controllers.

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 trip accuracy (±10%), guaranteed 350ms reset pulse width, pushbutton debounce capability, TO-92 form factor compatibility, and -40°C to +85°C industrial temperature operation.

Technical Context

The DS1233-10/T&R implements dual-function supervision: first, a comparator with temperature-compensated reference detects VCC falling below 4.25V or rising above 4.49V; second, it monitors the RST pin for external pushbutton edges, debounces transitions, and generates a fixed 350ms active-low reset pulse upon release. Both functions share the same output driver and timing circuitry.

No separate enable or configuration pins exist - operation is fully autonomous. The device draws only 50μA typical quiescent current and tolerates VCC from 1.2V to 5.5V, though valid reset assertion requires VCC ≥ 4.25V for the -10 variant. Absolute maximum VCC is +7.0V.

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 is Ground, Pin 2 is active-low RESET output, and Pin 3 is VCC input. No fourth pin exists in TO-92; SOT-223 variants add a second ground but DS1233-10/T&R uses only the 3-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G12DBVR, the DS1233-10/T&R uniquely combines ±10% 5V supervision, integrated pushbutton debounce, and TO-92 packaging - delivering complete reset control in minimal footprint without external passive components.

Availability

DS1233-10/T&R is available at Aetrix Electronics and suitable for industrial PLC controllers, embedded metering devices, point-of-sale terminals, and medical diagnostic sensor modules requiring stable component supply and long-term manufacturability.

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 since 1965.

The DS1233-10/T&R belongs to Analog Devices' EconoReset family of cost-optimized supervisory ICs designed specifically for reliable, low-component-count power monitoring and manual reset control in resource-constrained embedded systems.

FAQ

What is the exact VCC trip voltage 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 is specified in the datasheet's DC Electrical Characteristics table under VCCTP1 parameter, and applies across the full -40°C to +85°C operating temperature range due to its temperature-compensated reference.

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

Yes, DS1233-10/T&R requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground for proper pushbutton debounce functionality. The datasheet specifies this in the "Operation-Pushbutton Reset" section and notes that a minimum 500pF capacitor plus 1kΩ external pull-up is recommended when additional reset current is needed.

Is DS1233-10/T&R pin-compatible with other DS1233 variants like DS1233-5/T&R?

Yes, DS1233-10/T&R is pin-compatible with all TO-92 packaged DS1233 variants (e.g., DS1233-5/T&R, DS1233-15/T&R) because they share identical 3-pin TO-92 pinout: Pin 1 = Ground, Pin 2 = RESET, Pin 3 = VCC. Only the VCC trip threshold differs between variants; no PCB redesign is needed when swapping within the same package type.

What is the reset output drive capability of DS1233-10/T&R?

The DS1233-10/T&R provides an open-drain RESET output capable of sinking up to +8mA while maintaining VOL ≤ 0.4V. This allows direct interfacing with standard microprocessor reset inputs without external drivers. The internal 5kΩ pull-up resistor eliminates the need for an external pull-up in basic configurations, though external resistors may be added for stronger drive or noise immunity.

Can DS1233-10/T&R operate with supply voltages below 5V?

DS1233-10/T&R is rated for VCC from 1.2V to 5.5V per Absolute Maximum Ratings, but its ±10% supervision function is only valid when VCC is near 5V. Below ~4.25V, the device asserts reset continuously and cannot reliably monitor or release it. For true low-voltage supervision (e.g., 3.3V systems), Analog Devices offers the DS1233A-10 variant with 2.8V–2.97V trip range.