STMicroelectronics 74VHC574TTR

Overview

74VHC574TTR from STMicroelectronics is an advanced high-speed CMOS octal D-type flip-flop with 3-state non-inverting outputs, clocked on the LOW-to-HIGH edge, operating from 2V to 5.5V supply, delivering 180 MHz max clock frequency (typ. at VCC = 5V), 8 mA output drive, and ±2 kV ESD immunity - used for data latching and bus interface in 3.3V/5V mixed-signal systems.

For engineers reviewing the 74VHC574TTR datasheet, 74VHC574TTR pinout, 74VHC574TTR application, or 74VHC574TTR equivalent, key selection criteria include 3-state output control timing (tPZL/tPHZ ≤ 12.5 ns), latch-up immunity, input voltage tolerance up to 7V independent of VCC, and compatibility with legacy 74-series logic interfaces.

Technical Context

This device implements eight independent D-type latches with synchronous edge-triggered clocking and asynchronous 3-state output enable. Its sub-micron C2MOS process enables symmetrical output impedance (|IOH| = IOL ≥ 8 mA) and balanced propagation delays (tPLH ≅ tPHL).

The input structure supports power-down protection: inputs accept 0–7 V regardless of VCC, enabling safe level-shifting between 5V and 3V domains. Internal protection circuits provide 2 kV HBM ESD immunity on all pins without external components.

Key Specifications

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.05 mm max height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SN74LVC574APWR and 74HC574PW, the 74VHC574TTR uniquely supports dual-supply interoperability (2–5.5 V), 7 V input tolerance, and 180 MHz operation - making it optimal for modern mixed-voltage industrial and automotive interfaces where reliability and timing precision are critical.

Availability

74VHC574TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and medical diagnostic imaging interfaces requiring stable component supply and long-term lifecycle support.

Supply support for 74VHC574TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete components for industrial, automotive, and consumer markets.

The 74VHC logic family targets high-speed, low-power, and robust interface solutions for mixed-voltage digital systems - emphasizing ESD resilience, wide supply range, and pin compatibility with legacy TTL and CMOS logic.

FAQ

Can 74VHC574TTR operate with VCC = 3.3 V while accepting 5 V inputs?

Yes. The device supports input voltages from −0.5 V to +7.0 V independent of VCC, enabling direct 5 V-to-3.3 V level shifting without external components. This is verified in Table 4 (Absolute Maximum Ratings) and Table 5 (Recommended Operating Conditions), where VI is specified up to 7.0 V regardless of VCC setting.

What is the minimum clock pulse width required for reliable operation?

The minimum HIGH and LOW clock pulse width is 5.0 ns at both 3.3 V and 5.0 V supply, per Table 7. This ensures proper edge detection and internal state capture; violating this spec risks metastability or missed clock edges, especially under temperature extremes (−55°C to +125°C).

How does the 3-state output enable (OE) interact with internal latch behavior?

OE controls only output driver state - not internal storage. When OE = HIGH, Q0–Q7 enter high-impedance but retain their last latched values; new data can still be captured on subsequent CK edges. This allows seamless bus sharing without disrupting ongoing register updates, as confirmed in the functional description and truth table.

Is 74VHC574TTR suitable for use in automotive applications?

Yes. It is qualified for operation from −55°C to +125°C, features ±2 kV HBM ESD protection, and exhibits improved latch-up immunity per manufacturer characterization. While not AEC-Q100 certified out-of-box, its electrical and thermal specs align with under-hood and body-control module requirements when validated per customer qualification protocols.