Infineon Technologies MB3773PF-GT-BND-K5ERE1

Overview

MB3773PF-GT-BND-K5ERE1 from Cypress Semiconductor is a power supply monitor IC with integrated watchdog timer, designed for system-level reset generation during brownout, power-on, or processor lockup events. It features 4.20 V ±2.5% voltage detection threshold, 1.245 V ±1.5% precision reference output, and edge-triggered watchdog with CT capacitor–programmable timeout (TWD ≈ 100 × CT ms). Used in industrial control panels and arcade game logic boards to prevent data corruption and ensure fail-safe recovery.

For engineers reviewing the MB3773PF-GT-BND-K5ERE1 datasheet, MB3773PF-GT-BND-K5ERE1 pinout, MB3773PF-GT-BND-K5ERE1 application, or MB3773PF-GT-BND-K5ERE1 equivalent, key selection criteria include reset threshold accuracy, watchdog timing programmability via external capacitor, dual active-high/active-low reset outputs, and SOP-8 compatibility with legacy 5 V microcontroller systems.

Technical Context

The MB3773 implements two independent comparators: Comp.S monitors VS against an internal 1.245 V reference with 50–150 mV hysteresis to generate power-fail reset, while Comp.O controls RESET/RESET outputs based on CT voltage level. Its watchdog timer responds to negative-edge clock pulses on CK, initiating reset after CT discharges below ~0.4 V (TWD ≈ 100 × CT ms).

Reset hold time (TPR ≈ 1000 × CT ms) is set at power-on and independent of CK activity; TWR (≈ 20 × CT ms) defines the CT recharge time before watchdog re-enables after reset release. The internal reference amplifier supports external comparator use for multi-rail monitoring or overvoltage detection without additional pull-up components.

Key Specifications

Pinout & Package

MB3773PF-GT-BND-K5ERE1 is housed in an SOP-8 surface-mount package (SOE008), 5.0 mm × 6.2 mm body, 1.27 mm pitch, with standard JEDEC MO-153 compliance and RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply monitor with watchdog timer applications.

Compared with MAX6326US42D3+ and TPS3823-42DBVR, MB3773PF-GT-BND-K5ERE1 uniquely supports capacitor-programmable watchdog timing, dual-polarity reset outputs, and a buffered 1.245 V reference - enabling flexible system supervision without external components in industrial and arcade applications.

Availability

MB3773PF-GT-BND-K5ERE1 is available at Aetrix Electronics and suitable for industrial PLC controllers, arcade game logic boards, and factory automation HMI terminals requiring stable component supply across extended production lifecycles.

Supply support for MB3773PF-GT-BND-K5ERE1 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in microcontrollers, memory, and programmable system-on-chip solutions for industrial, automotive, and consumer markets.

The MB3773 belongs to Cypress's legacy power supervision IC product line, engineered specifically for robust reset generation and fail-safe watchdog operation in noise-prone, wide-voltage industrial environments.

FAQ

What is the minimum VCC required for MB3773PF-GT-BND-K5ERE1 to assert a valid reset signal?

The device asserts RESET/RESET when VCC falls below 4.20 V, but it remains functional down to 0.8 V. At VCC = 0.8 V, RESET goes low and RESET goes high, ensuring controlled shutdown even during deep brownout. This behavior is verified per Electrical Characteristics Table (VCCL1/VCCL2 = 0.8 V typ).

Can the MB3773PF-GT-BND-K5ERE1 watchdog timer be disabled?

No, the watchdog cannot be permanently disabled. However, continuous CK pulses at ≥10 Hz prevent timeout - effectively disabling reset assertion during normal operation. If CK stops, TWD begins immediately; there is no software or hardware disable pin.

Does the VREF output support sourcing or sinking current?

VREF supports both sourcing and sinking: it delivers up to +5 μA or sinks up to –200 μA while maintaining ±1.5% accuracy. This allows direct connection to external comparator inputs or bias networks without buffering, as confirmed in DC Characteristics (IOUT = –200 μA to +5 μA).

Is the MB3773PF-GT-BND-K5ERE1 compatible with 3.3 V microcontrollers?

Yes - though its detection threshold is fixed at 4.20 V, it operates from VCC = 3.5 V to 16 V. When powered from 3.3 V, the internal reference and comparators remain functional, but VS monitoring applies only to higher-voltage rails (e.g., 5 V auxiliary supply). CK and RESET interfaces are 3.3 V tolerant per Absolute Maximum Ratings (VCK = –0.3 V to +18 V).