Texas Instruments SN74ACT534PWR

Overview

SN74ACT534PWR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state inverting outputs, designed for bus interface applications requiring high-drive capability and logic-level compatibility. It operates from 4.5 V to 5.5 V, delivers 24 mA output drive, achieves 10.5 ns max propagation delay at 5 V, and supports TTL-voltage-compatible inputs. It is used in bidirectional bus drivers and I/O port buffering in industrial control backplanes.

For engineers reviewing the SN74ACT534PWR datasheet, SN74ACT534PWR pinout, SN74ACT534PWR application, or SN74ACT534PWR equivalent, key selection criteria include its 20-pin TSSOP package, 3-state output control via OE, edge-triggered synchronous operation on CLK↑, and compatibility with 5-V CMOS/TTL logic families in high-capacitance bus environments.

Technical Context

This device implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output delivering the logical complement of its corresponding D input. Internal circuitry ensures simultaneous parallel loading across all eight channels without internal gating delays between stages.

The buffered OE input enables high-impedance state independently of clock activity, allowing data retention or new data setup while outputs are tri-stated. Outputs remain fully compatible with 5-V systems and tolerate input voltages up to 5.5 V, supporting mixed-voltage board interfacing.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.6 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.

Compared with SN74ACT534PWR, SN74ACT574PWR provides functional equivalence except output polarity, enabling direct substitution where inversion is acceptable; SN74LVC574APWR offers lower voltage operation but requires full system-level voltage translation for 5-V bus integration.

Availability

SN74ACT534PWR is available at Aetrix Electronics and suitable for industrial backplane bus drivers, programmable logic interfaces, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for SN74ACT534PWR 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 experience in high-reliability industrial and automotive-grade components.

The SN74ACT534PWR belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for robust 5-V operation with TTL compatibility, high noise immunity, and bus-interface reliability in demanding industrial environments.

FAQ

What is the maximum clock frequency supported by the SN74ACT534PWR?

The SN74ACT534PWR supports a maximum clock frequency of 85 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = –40°C to 85°C). This is derived from its minimum clock pulse width (tw) of 3.5 ns and verified timing parameters in the official datasheet SCAS556C. The SN74ACT534PWR maintains deterministic setup/hold timing margins across this range, making it suitable for high-speed synchronous bus applications.

Does the SN74ACT534PWR require external pull-up resistors on the OE pin?

Yes - to ensure the outputs remain in high-impedance during power-up or power-down, OE should be tied to VCC through a pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source, as specified in the SN74ACT534PWR datasheet. This prevents bus contention at power transition edges and is a mandatory design practice for reliable system initialization.

Can the SN74ACT534PWR interface directly with 3.3-V logic devices?

No - the SN74ACT534PWR is a 5-V-only device with VCC range 4.5 V to 5.5 V and TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). While its inputs accept voltages up to 5.5 V, they are not guaranteed to correctly interpret 3.3-V logic levels without external level-shifting. Direct connection to 3.3-V drivers risks marginal or incorrect logic detection and is not recommended per the SN74ACT534PWR specification.

What is the thermal performance of the SN74ACT534PWR in its TSSOP package?

The SN74ACT534PWR in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (θJA) of 83°C/W, as documented in the absolute maximum ratings table. This value assumes standard JEDEC test board conditions. For continuous operation at full output drive, derating is required above 70°C ambient; thermal design must include adequate copper pour and airflow to maintain junction temperature below 125°C per the SN74ACT534PWR datasheet limits.

How does the SN74ACT534PWR handle unused inputs?

All unused inputs of the SN74ACT534PWR must be held at a defined logic level - either VCC or GND - to prevent floating nodes that could cause excessive ICC current, logic instability, or ESD susceptibility. This requirement is explicitly stated in the "recommended operating conditions" section of the SN74ACT534PWR datasheet and applies to all D, CLK, and OE inputs not actively driven in the application.