Texas Instruments SN74AC564PW

Overview

SN74AC564PW from Texas Instruments is an octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus interface and register applications. It operates across 2V–6V V_CC, delivers ≤9ns propagation delay at 5V, supports rising-edge clock triggering, and drives capacitive or low-impedance loads directly-used in I/O port buffering and bidirectional data buses.

For engineers reviewing the SN74AC564PW datasheet, SN74AC564PW pinout, SN74AC564PW application, or SN74AC564PW equivalent, key selection considerations include its TSSOP-20 package, 3-state inverting output architecture, 85 MHz max clock frequency at 5V, and compatibility with mixed-voltage logic systems (inputs tolerate up to 6V).

Technical Context

The SN74AC564PW implements eight independent D-type flip-flops sharing a common rising-edge-triggered CLK and active-low OE control. Each Q output is inverted relative to its D input on clock transition, and OE independently places all outputs in high-impedance state without affecting internal latch operation.

Its AC logic family ensures CMOS-level noise immunity and rail-to-rail output swing, with input thresholds defined as V_IL ≤ 1.65V and V_IH ≥ 3.85V at V_CC = 5.5V. The device maintains stable timing across −40°C to +85°C, with t_su = 2.0 ns and t_h = 2.0 ns minimum at 5V.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC564PW, SN74LVC574APW offers faster speed in 3.3V systems but lacks 5V tolerance and inverting outputs, while 74AC574SCX provides identical functionality in a thermally superior SOIC package-making it ideal for thermally constrained or manually assembled designs.

Availability

SN74AC564PW is available at Aetrix Electronics and suitable for industrial I/O expansion, memory-mapped peripheral interface, digital test equipment data capture, and automated test fixture control requiring stable component supply and long-term BOM continuity.

Supply support for SN74AC564PW 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 over 90 years of innovation in industrial, automotive, and communications markets.

The SN74AC564PW belongs to TI's AC logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial control, test equipment, and legacy system upgrades where robust timing and bus isolation are critical.

FAQ

What is the maximum clock frequency supported by the SN74AC564PW?

The SN74AC564PW supports a maximum clock frequency of 85 MHz at V_CC = 5 V ± 0.5 V, as specified in Section 4.6 of the datasheet. This is derived from minimum pulse width (4 ns) and verified under recommended operating conditions with t_su = 2.0 ns and t_h = 2.0 ns. At 3.3 V, the limit drops to 60 MHz due to reduced drive strength and increased propagation delay.

Does the SN74AC564PW have built-in ESD protection?

Yes, the SN74AC564PW incorporates standard CMOS ESD protection structures, rated per JEDEC JS-001 to ≥2000V HBM and ≥200V MM. TI recommends handling with standard ESD precautions-including grounded workstations and ionized air-due to susceptibility to latent damage from discharges below visible threshold, as noted in Section 8.5 of the datasheet.

Can the SN74AC564PW operate with a 3.3V supply while interfacing to 5V logic?

Yes, the SN74AC564PW can operate from a 3.3V supply and safely accept 5V input signals on all D, CLK, and OE pins because its inputs tolerate voltages up to V_CC + 0.5V (i.e., 3.8V) and beyond-up to 6V-as confirmed in Absolute Maximum Ratings (Section 4.1). However, its outputs swing only to 3.3V levels, so external pull-ups or level translators are needed for 5V bus driving.

Is the SN74AC564PW pin-compatible with other members of the '564 family?

Yes, the SN74AC564PW shares identical pinout and function with all SN74AC564 variants (DB, DW, N, NS), including SN74AC564PWR and SN74AC564DW. Pin mapping, electrical behavior, and timing parameters are fully consistent across packages-only thermal performance (R_θJA) and mechanical dimensions differ, as documented in Package Information and Thermal Tables.

What is the purpose of the OE pin on the SN74AC564PW, and how should it be used during power-up?

The OE (output enable) pin on the SN74AC564PW is an active-low control that places all eight Q outputs in high-impedance state when asserted high. During power-up, TI recommends tying OE to V_CC via a pull-up resistor (value determined by driver sink capability) to ensure outputs remain in high-Z until firmware initializes the device-preventing bus conflicts or unintended signal assertion before system readiness.