Texas Instruments CD74ACT175EE4

Overview

CD74ACT175EE4 from Texas Instruments is a quadruple positive-edge-triggered D-type flip-flop with asynchronous clear, TTL-voltage-compatible inputs, complementary outputs per stage, ±24-mA output drive, and balanced propagation delays (tPLH/tPHL ≤ 11.5 ns at –55°C to 125°C). It operates from 4.5 V to 5.5 V and supports high-speed register storage in industrial control logic.

For engineers reviewing the CD74ACT175EE4 datasheet, CD74ACT175EE4 pinout, CD74ACT175EE4 application, or CD74ACT175EE4 equivalent, key selection criteria include its 114-MHz maximum clock frequency, SCR-latchup-resistant CMOS process, 2-kV ESD rating, double-rail output architecture, and PDIP-16 package compatibility with legacy through-hole PCB layouts.

Technical Context

This device implements four independent D-type latches synchronized to the rising edge of CLK, each with dedicated CLR, D, Q, and Q̅ terminals. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) enable direct interfacing with bipolar logic families without level-shifting.

Each flip-flop features buffered inputs and rail-to-rail CMOS outputs capable of driving up to 15 F-series loads. Propagation delays are tightly matched between Q and Q̅ outputs, supporting precise timing in synchronous state machines and pattern generation circuits.

Key Specifications

Pinout & Package

CD74ACT175EE4 is housed in a 16-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Thermal resistance θJA is 67°C/W, suitable for natural-convection cooling in non-ventilated enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT175N and 74AC175PC, CD74ACT175EE4 offers verified operation up to +125°C, lower static power (≤160 µA), and tighter propagation delay matching - making it the preferred choice for high-reliability, extended-temperature digital control systems.

Availability

CD74ACT175EE4 is available at Aetrix Electronics and suitable for industrial control logic, buffer/storage registers, shift registers, and pattern generators requiring stable component supply across extended temperature ranges.

Supply support for CD74ACT175EE4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

CD74ACT175EE4 belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-power, TTL-compatible digital interfacing in harsh-environment applications.

FAQ

What is the maximum operating temperature for CD74ACT175EE4?

The CD74ACT175EE4 is rated for continuous operation from –55°C to +125°C, verified per TI's recommended operating conditions and absolute maximum ratings. This extended temperature range is confirmed in the datasheet's "Recommended Operating Conditions" table and supported by thermal characterization (θJA = 67°C/W for PDIP package), making CD74ACT175EE4 suitable for under-hood automotive, aerospace, and industrial control applications where ambient temperatures exceed standard commercial limits.

Does CD74ACT175EE4 support TTL-level input signals?

Yes, CD74ACT175EE4 features TTL-voltage-compatible inputs with VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 4.5 V to 5.5 V. This allows direct connection to 74LS, 74F, and other bipolar logic families without level-shifting circuitry. Input clamp current is specified at ±20 mA, and the device maintains valid logic thresholds across its full operating temperature range, ensuring interoperability in mixed-technology systems.

What is the purpose of the complementary Q and Q̅ outputs on CD74ACT175EE4?

The complementary Q and Q̅ outputs on each of the four flip-flops in CD74ACT175EE4 provide true and inverted data simultaneously, eliminating the need for external inverters in applications requiring both signal polarities. This architecture reduces board space, component count, and propagation delay skew in synchronous logic such as Johnson counters, parity generators, and differential bus interfaces - directly improving timing margin and system reliability.

Can CD74ACT175EE4 be used in place of CD74ACT175E?

Yes, CD74ACT175EE4 is a manufacturer-confirmed variant of CD74ACT175E, sharing identical electrical specifications, pinout, package (PDIP-16), and marking (CD74ACT175E). The "E4" suffix denotes TI's RoHS-compliant, green (halogen-free) packaging standard introduced after 2006, with no functional or timing differences from the base CD74ACT175E. Both parts meet the same MIL-STD-883 ESD rating and operate across –55°C to +125°C.

What is the minimum pulse width required for the CLR input on CD74ACT175EE4?

The minimum pulse width for the active-low CLR input on CD74ACT175EE4 is 4 ns at –55°C to +125°C, as specified in the "Timing Requirements" table. This narrow pulse requirement enables fast asynchronous reset in high-speed state machines. The recovery time (trec) from CLR deassertion to next valid CLK edge is 1 ns, ensuring minimal disruption to clocked operation after reset release - a critical parameter for real-time control loop synchronization.