Texas Instruments CD74HC574M96E4

Overview

CD74HC574M96E4 from Texas Instruments is a high-speed CMOS octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and bus-driving capability (15 LSTTL loads). It operates from 2 V to 6 V, features 15 ns typical propagation delay at 5 V/15 pF, and supports –55°C to +125°C industrial/military temperature range. It is used in data latching and bus isolation in microcontroller peripheral interfaces.

For engineers reviewing the CD74HC574M96E4 datasheet, CD74HC574M96E4 pinout, CD74HC574M96E4 application, or CD74HC574M96E4 equivalent, key selection criteria include 3-state output enable independence, edge-triggered register behavior, wide supply voltage tolerance, thermal robustness across extreme temperatures, and compatibility with both CMOS and TTL logic levels.

Technical Context

The CD74HC574M96E4 implements eight independent D-type flip-flops synchronized to the rising edge of the clock (CP), with asynchronous 3-state control via a shared output enable (OE) input. Its register operation is fully decoupled from output state - OE HIGH forces all Q outputs into high-impedance regardless of stored data or clock activity.

This device belongs to the HC logic family and exhibits rail-to-rail CMOS input thresholds (VIH = 3.15 V min, VIL = 1.35 V max at VCC = 4.5 V), 10 μA input leakage, and 39 pF power dissipation capacitance. It drives up to 15 LSTTL loads while maintaining balanced tPLH/tPHL transition times and low dynamic power consumption.

Key Specifications

Pinout & Package

CD74HC574M96E4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.050″ (1.27 mm) lead pitch and RoHS-compliant NiPdAu lead finish. The package is moisture-sensitive Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC374M96E4, the CD74HC574M96E4 offers optimized pin arrangement for bus-oriented layouts, while SN74HC574N provides through-hole accessibility at the cost of thermal efficiency and automation compatibility - choice depends on assembly method, layout constraints, and thermal budget.

Availability

CD74HC574M96E4 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, test equipment design, and avionics data interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC574M96E4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.

The CD74HC574M96E4 belongs to TI's HC-series high-speed CMOS logic portfolio, designed for robust data latching and bus isolation in demanding industrial, military, and aerospace applications where wide voltage range and extreme temperature operation are critical.

FAQ

What is the maximum clock frequency supported by the CD74HC574M96E4?

The CD74HC574M96E4 supports a maximum clock frequency of 60 MHz when loaded with CL = 15 pF at VCC = 5 V. At wider temperature ranges (–55°C to +125°C), the guaranteed fMAX drops to 23 MHz for VCC = 6 V and 20 MHz for VCC = 4.5 V, per TI's switching characteristics table. This makes CD74HC574M96E4 suitable for high-speed data capture in real-time control loops.

Does the CD74HC574M96E4 have Schmitt-trigger inputs?

No, the CD74HC574M96E4 does not feature Schmitt-trigger inputs. Its CP, Dn, and OE inputs follow standard CMOS threshold behavior (VIH ≈ 70% VCC, VIL ≈ 30% VCC), meaning it requires clean, monotonic input transitions. For noisy environments, external RC filtering or dedicated Schmitt-trigger buffers (e.g., SN74LVC1G17) should precede CD74HC574M96E4 inputs to prevent false triggering.

Can the CD74HC574M96E4 drive a 50-pF bus capacitance reliably?

Yes, the CD74HC574M96E4 can drive a 50-pF bus capacitance, though with increased propagation delay: tPD rises to 50 ns at VCC = 6 V and 41 ns at VCC = 4.5 V (per switching characteristics). Its 15 LSTTL load rating corresponds to ~450 pF total capacitive load, so 50 pF falls well within specification - ensure proper VCC decoupling and minimize trace inductance for signal integrity.

Is the CD74HC574M96E4 pin-compatible with the CD74HC374M96E4?

No, the CD74HC574M96E4 is not pin-compatible with the CD74HC374M96E4. Although both are 20-pin SOIC octal D-type flip-flops with identical functionality, their pinouts differ: CD74HC574M96E4 places Q0–Q7 on pins 11–18 and D0–D7 on pins 2–9, whereas CD74HC374M96E4 swaps these groups. Using them interchangeably requires PCB redesign - always verify pin mapping before substitution.

What is the recommended bypass capacitor for the CD74HC574M96E4?

Texas Instruments recommends a 0.1 μF ceramic bypass capacitor placed as close as possible to the VCC (pin 20) and GND (pin 10) terminals of the CD74HC574M96E4. For improved high-frequency noise suppression, this may be paralleled with a 1 μF capacitor. The capacitor must be low-ESR and mounted with minimal trace length to maintain power rail stability during output switching events.