Toshiba Semiconductor and Storage TC74ACT574FTEL

Overview

TC74ACT574FTEL from Toshiba is an octal D-type flip-flop with 3-state outputs, designed for high-speed digital interface and data latching in 5 V CMOS systems. It delivers 180 MHz typical maximum clock frequency, 24 mA output drive capability into 50 Ω transmission lines, and TTL/NMOS/CMOS input compatibility - enabling use as a level translator between legacy logic families and high-speed CMOS buses.

For engineers reviewing the TC74ACT574FTEL datasheet, TC74ACT574FTEL pinout, TC74ACT574FTEL application, or TC74ACT574FTEL equivalent, key selection criteria include its 20-pin TSSOP package, 3-state output control via OE, balanced propagation delays (tpLH/tpHL), low 8 μA max quiescent ICC, and pin/function compatibility with 74F574.

Technical Context

The TC74ACT574FTEL implements eight edge-triggered D-type flip-flops sharing a common clock (CK) and output enable (OE) control. Its C2MOS silicon gate process enables bipolar-equivalent speed (180 MHz typ.) while maintaining CMOS power efficiency - critical for bus-hold and data capture in mixed-voltage systems.

All inputs tolerate TTL-level thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and outputs provide symmetrical ±24 mA drive with matched rise/fall characteristics. The device enters high-impedance state when OE is high, supporting bidirectional bus architectures without external isolation.

Key Specifications

Pinout & Package

TSSOP20-P-0044-0.65A: 20-pin thin shrink small outline package, 0.65 mm pitch, 4.4 mm body width, 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 SN74ACT574N and 74LCX574MTCX, the TC74ACT574FTEL uniquely combines 5 V TTL interoperability, TSSOP20 surface-mount packaging, and ultra-low 8 μA quiescent current - making it optimal for space-constrained industrial controllers needing legacy bus compatibility.

Availability

TC74ACT574FTEL is available at Aetrix Electronics and suitable for industrial bus interface, legacy system upgrades, and high-speed data acquisition requiring stable component supply and long-term lifecycle support.

Supply support for TC74ACT574FTEL 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with decades of leadership in CMOS logic and power devices.

The TC74ACT574FTEL belongs to Toshiba's advanced high-speed CMOS logic family, engineered specifically to replace bipolar TTL in 5 V systems while delivering CMOS power efficiency and robust noise immunity.

FAQ

What is the operating voltage range for the TC74ACT574FTEL?

The TC74ACT574FTEL operates over a supply voltage range of 4.5 V to 5.5 V. This 5 V nominal range ensures compatibility with standard TTL and CMOS logic families while maintaining stable timing and output drive performance across industrial temperature extremes (−40°C to +85°C). Operation outside this range may cause functional failure or accelerated degradation.

Is the TC74ACT574FTEL pin-compatible with the 74F574?

Yes, the TC74ACT574FTEL is pin and function compatible with the 74F574, including identical pin assignments for D0–D7, Q0–Q7, CK, OE, VCC, and GND. This allows direct replacement in existing designs using the TSSOP20 footprint, preserving PCB layout while upgrading to lower power and higher speed.

Does the TC74ACT574FTEL support hot insertion or live bus swapping?

No, the TC74ACT574FTEL does not support hot insertion. Its absolute maximum ratings specify that VCC must be established before applying input signals, and unused inputs must be tied to VCC or GND. Live bus swapping risks violating VI/O limits and triggering latch-up due to uncontrolled voltage sequencing.

What is the maximum output current per pin for the TC74ACT574FTEL?

The TC74ACT574FTEL provides a minimum output current of ±24 mA per Q pin under specified test conditions (VCC = 4.5–5.5 V, Ta = −40°C to +85°C). This rating applies to DC drive into resistive loads and confirms capability to drive 50 Ω transmission lines - but continuous operation at full current requires thermal derating per the package's 180 mW power dissipation limit.

How does the TC74ACT574FTEL handle input noise or slow signal edges?

The TC74ACT574FTEL specifies input rise/fall time limits of 0 to 10 ns/V and includes integrated input protection circuits. While it tolerates moderate noise due to hysteresis-free CMOS inputs, slow edges (<10 ns/V) increase susceptibility to metastability and false triggering on CK or OE. For noisy environments, external RC filtering or Schmitt-trigger buffers are recommended before CK and control inputs.