Texas Instruments SN74ACT564DBRG4

Overview

SN74ACT564DBRG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverted outputs, designed for bus interface and register applications. It operates from 4.5 V to 5.5 V, delivers 8.5 ns max propagation delay at 5 V, features TTL-compatible inputs, and supports direct capacitive bus driving without pull-ups. Used in bidirectional data buses and I/O port buffering.

For engineers reviewing the SN74ACT564DBRG4 datasheet, SN74ACT564DBRG4 pinout, SN74ACT564DBRG4 application, or SN74ACT564DBRG4 equivalent, this page provides verified functional role, timing behavior, output drive capability, thermal limits, and validated alternatives for industrial bus interface design.

Technical Context

The SN74ACT564DBRG4 implements eight independent D-type latches triggered on the positive clock edge, with each Q output inverted relative to its D input. Its 3-state OE control operates independently of internal clocking - enabling data retention during output disable.

It uses ACT (Advanced CMOS TTL-compatible) logic family architecture, delivering rail-to-rail output swing, ±24 mA drive strength, and flow-through pinout for minimized PCB trace length. Input voltage tolerance extends to 5.5 V regardless of VCC, supporting mixed-voltage interfacing.

Key Specifications

Pinout & Package

SN74ACT564DBRG4 is housed in a 20-pin SSOP (Shrink Small-Outline Package), JEDEC MO-150 compliant, with 0.65 mm lead pitch and 7.50 mm × 4.40 mm body dimensions. The package supports fine-pitch surface-mount assembly and offers improved thermal performance over PDIP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT564DBRG4, SN74ACT574DBR preserves timing and drive but removes output inversion, while SN74LVC574APWR reduces voltage range and eliminates 5 V tolerance - making SN74ACT564DBRG4 uniquely suited for robust 5 V bus interfacing with inverted logic support.

Availability

SN74ACT564DBRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller I/O expansion, automated test equipment, and automotive validation fixtures requiring stable component supply and long-term obsolescence management.

Supply support for SN74ACT564DBRG4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade product leadership.

The SN74ACT564DBRG4 belongs to TI's ACT logic family, engineered for high-speed 5 V bus interface applications demanding TTL compatibility, low skew, and robust noise immunity in harsh environments.

FAQ

What is the maximum clock frequency supported by the SN74ACT564DBRG4?

The SN74ACT564DBRG4 supports a maximum clock frequency of 75 MHz under recommended operating conditions (VCC = 5 V, TA = 85 °C), based on its 3.5 ns minimum pulse width and 8.5 ns max tpd. At 25 °C, it achieves up to 85 MHz operation per datasheet timing characteristics.

Does the SN74ACT564DBRG4 require external pull-up resistors on the OE pin?

Yes - to ensure outputs remain in high-impedance during power-up or brown-out, OE must be tied to VCC via a pull-up resistor. The minimum value depends on the driver's sink capability; TI recommends ≥10 kΩ for typical microcontroller OE control.

Can the SN74ACT564DBRG4 interface directly with 3.3 V logic devices?

No - while inputs tolerate up to 5.5 V, the SN74ACT564DBRG4 is a 5 V-only device (4.5–5.5 V VCC). Its outputs swing rail-to-rail and exceed 3.3 V logic high thresholds, risking damage to 3.3 V inputs unless level-shifted or current-limited.

What is the thermal resistance (θJA) of the SN74ACT564DBRG4 in its DB package?

The SN74ACT564DBRG4 in the SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 70 °C/W, measured per JESD 51-7. This value assumes standard JEDEC 2S2P board layout and defines safe continuous power dissipation limits at 85 °C ambient.

How does the inverted output configuration of the SN74ACT564DBRG4 affect bus arbitration?

The inverted outputs of the SN74ACT564DBRG4 simplify active-low bus protocols (e.g., /RD, /WR, /CS). When used with open-drain or wired-AND arbitration, the inversion allows direct connection to negative-logic control lines without external gates - reducing component count and propagation delay in the SN74ACT564DBRG4 signal path.