Analog Devices Inc./Maxim Integrated DS1233-15

Overview

DS1233-15 from Analog Devices is a 5V microprocessor supervisory circuit with 15% VCC trip point tolerance (4.0V–4.24V), 350ms reset pulse width, internal 5kΩ pull-up resistor, and pushbutton debounce functionality. It operates from -40°C to +85°C in TO-92 package and serves as a power-fail detector and manual reset controller in embedded microcontroller systems.

For engineers reviewing the DS1233-15 datasheet, DS1233-15 pinout, DS1233-15 application, or DS1233-15 equivalent, key selection criteria include VCC trip accuracy, reset timing stability, pushbutton interface compatibility, and lead-free TO-92 packaging for cost-sensitive industrial control and legacy board designs.

Technical Context

The DS1233-15 integrates a precision temperature-compensated voltage reference and comparator to monitor VCC against a fixed 15% threshold (VCCTP2 = 4.0–4.24V). It asserts an active-low RESET signal during out-of-tolerance conditions and holds it for 350ms after VCC recovery.

It supports external pushbutton reset via the RST pin, debouncing switch transitions and generating a guaranteed 350ms reset pulse upon release. Internal 5kΩ pull-up eliminates need for external resistor in standard configurations.

Key Specifications

Pinout & Package

DS1233-15 is supplied in a 3-pin TO-92 package (ordering suffix "+" or "+T&R"). Pin 1 = GROUND, Pin 2 = RESET (open-drain output), Pin 3 = VCC. No fourth pin - SOT-223 variant (DS1233Z-15) has Pin 4 = GROUND, but DS1233-15 is strictly 3-pin TO-92.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DS1233-15, MAX809SEUR+T offers tighter trip accuracy but omits pushbutton support, while TPS3808G15DBVR adds flexibility at the cost of complexity and BOM count-DS1233-15 remains optimal where low-cost, self-contained reset + manual override is required in TO-92 form factor.

Availability

DS1233-15 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy embedded control panels, and point-of-sale terminal power management requiring stable component supply and long-term obsolescence mitigation.

Supply support for DS1233-15 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The DS1233-15 belongs to the EconoReset family of supervisory circuits designed specifically for cost-sensitive, reliability-critical microprocessor reset applications in industrial and legacy embedded systems.

FAQ

What is the exact VCC trip voltage range for DS1233-15?

The DS1233-15 has a guaranteed VCC trip point range of 4.0V to 4.24V (15% tolerance at nominal 5V), with typical value 4.125V. This range is defined under -40°C to +85°C and ensures reset assertion before most 5V microcontrollers enter unstable operating regions. The DS1233-15 uses a precision temperature-compensated reference to maintain this specification across its full operating temperature range.

Does DS1233-15 require an external capacitor on the RST pin?

Yes - a capacitor between 100pF and 0.01μF must be connected from RST to ground for proper pushbutton debounce operation. For applications needing higher reset sink current, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended. The DS1233-15 does not function correctly with pushbutton input unless this capacitor is present.

Is DS1233-15 pin-compatible with DS1233-10 or DS1233-5?

Yes - DS1233-15, DS1233-10, and DS1233-5 share identical TO-92 pinout (Pin 1 = GND, Pin 2 = RST, Pin 3 = VCC) and electrical interface. They differ only in VCC trip point: 15%, 10%, or 5% tolerance respectively. System-level replacement is possible if the new trip threshold meets the target microcontroller's VDD minimum specification.

Can DS1233-15 drive a standard CMOS input directly?

No - DS1233-15 features an open-drain RST output and requires an external pull-up resistor to VCC (or another logic rail) to drive CMOS inputs. Its internal 5kΩ pull-up is intended only for basic pushbutton detection, not for driving logic loads. For direct CMOS interfacing, a 10kΩ external pull-up to 5V is typically used alongside the DS1233-15.

What is the maximum allowable VCC slew rate for reliable DS1233-15 operation?

The DS1233-15 specifies a maximum VCC slew rate of 300μs for the 4.75V → 4.00V transition (tF). Exceeding this rate may cause premature or missed reset assertion. During power-up, the device guarantees reset hold for ≥250ms after VCC crosses the trip threshold (tRPU), provided slew rate remains within datasheet limits. This requirement ensures robust detection of gradual brownout conditions.