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Home > Products > Integrated Circuits (ICs) > Logic > Flip Flops

Texas Instruments SN74AC564DBR

Name: SN74AC564DBR
Brand: Texas Instruments
SKU: SN74AC564DBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AC564DBR

Manufacturer:: Texas Instruments

Category:: Flip Flops

Package:: 20-SSOP (0.209", 5.30mm Width)

Datasheet:: SN74AC564DBR.pdf

Description:: IC FF D-TYPE SNGL 8BIT 20SSOP

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Product details

Overview

SN74AC564DBR 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 ≤9 ns propagation delay at 5V, and supports rising-edge clock triggering with full parallel data loading. It is used in bidirectional bus drivers and I/O port buffering in industrial control and embedded communication subsystems.

For engineers reviewing the SN74AC564DBR datasheet, SN74AC564DBR pinout, SN74AC564DBR application, or SN74AC564DBR equivalent, this page provides verified functional identity, confirmed SSOP-20 package mapping, validated timing and drive specifications, and two technically documented alternative parts for bus-interface flip-flop selection.

Technical Context

The SN74AC564DBR implements eight independent D-type flip-flops sharing a common rising-edge-triggered clock (CLK) and a global active-low output-enable (OE) control. Each Q output is the logical inverse of its corresponding D input on CLK's positive transition.

Its 3-state inverting outputs support direct connection to capacitive or low-impedance buses without external pull-ups or interface logic. OE controls output impedance only - internal flip-flop operation continues regardless of OE state, enabling data retention or update during bus isolation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	2 V to 6 V - supports mixed-voltage system interfacing and legacy 5V or modern 3.3V logic domains.
Max t_pd	9 ns at V_CC = 5 V - enables reliable operation in high-speed digital control loops up to ~85 MHz clock frequency.
Output Drive	±24 mA at V_CC = 4.5–5.5 V - sufficient to directly drive standard TTL/CMOS loads and moderate-capacitance buses.
Input Voltage Tolerance	Inputs accept up to 6 V - allows safe interfacing with higher-voltage signals without level-shifting circuitry.
Operating Temperature	−40 °C to +85 °C - qualified for industrial-grade embedded systems and automation equipment.
Logic Family	Advanced CMOS (AC) - delivers CMOS power efficiency with TTL-compatible speed and drive strength.
Propagation Delay Skew	≤1.5 ns (t_PLH/t_PHL variation across channels) - ensures tight timing alignment for parallel data paths.

Pinout & Package

SN74AC564DBR is housed in a 20-pin SSOP (Shrink Small Outline Package), DB variant, with 0.65 mm lead pitch, 7.2 mm × 7.8 mm body-plus-lead footprint, and maximum height of 2.0 mm - optimized for space-constrained PCB layouts while maintaining hand-solderability and reflow compatibility.

Pin/Terminal	Circuit Role	Design Meaning
1 (OE)	Active-low output enable	Global control for all eight Q outputs; asserts high-impedance state when high, enabling bus sharing.
2–9 (D1–D8)	Data inputs	Parallel asynchronous inputs latched on CLK rising edge; each drives inverted Q output.
10 (GND)	Ground reference	Common return path for logic and output current; requires local bypass capacitor placement.
11 (CLK)	Clock input	Rising-edge-triggered synchronous control; all eight flip-flops update simultaneously on CLK↑.
12–19 (Q8–Q1)	Inverting 3-state outputs	Outputs reflect !Dn when OE is low; enter high-Z when OE is high - no bus contention.
20 (V_CC)	Positive supply	Single-supply rail supporting 2–6 V; must be decoupled with ≥0.1 µF ceramic capacitor near pin.

Key Features

Feature	Design Value
Flow-through pinout	Input pins (D1–D8) on left side, outputs (Q8–Q1) on right side - minimizes trace crossovers and improves signal integrity in dense layouts.
Full parallel access	All eight D inputs and Q outputs accessible simultaneously - eliminates serialization overhead in register-file or buffer applications.
Bus-compatible 3-state outputs	Outputs drive directly onto shared data/address buses without external resistors or buffers - reduces BOM count and board area.
V_CC-independent input tolerance	Inputs tolerate up to 6 V regardless of V_CC setting - simplifies mixed-voltage interconnect with legacy peripherals or sensors.
Low input capacitance	C_i = 4.5 pF at 5 V - reduces loading on upstream drivers and preserves signal edge rates in high-frequency operation.

Applications

Industrial PLC I/O Modules	Embedded Communication Bus Interface
Use Scenario: Isolating and buffering parallel data between microcontroller GPIO banks and field I/O terminals in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an octal register with synchronized latch and bus-isolation capability - holds stable output states during controller reconfiguration or fault recovery. Use Value: Enables deterministic, glitch-free I/O updates via single-clock edge; 3-state outputs prevent bus contention during hot-swap or diagnostics.	Use Scenario: Interfacing an FPGA's parallel peripheral bus to legacy 8-bit microprocessor address/data lines in test instrumentation. IC Role / Device Role / Timing Role: Serves as bidirectional bus driver/register - latches outgoing data on CLK↑ and presents inverted, high-drive outputs to the bus. Use Value: Eliminates need for discrete transceivers or pull-up networks; flow-through layout simplifies routing in constrained FPGA carrier boards.
Automotive Body Control Unit Registers	Test Equipment Signal Conditioning
Use Scenario: Holding configuration bits for LED drivers, relay controllers, and sensor multiplexers in automotive BCMs operating across wide temperature ranges. IC Role / Device Role / Timing Role: Functions as a nonvolatile shadow register - retains last valid state even during transient OE assertion for diagnostic mode entry. Use Value: Ensures fail-safe output behavior during firmware updates or CAN message interruptions; −40 °C to +85 °C rating meets AEC-Q100 ambient requirements.	Use Scenario: Capturing and holding analog-to-digital converter parallel output words in automated test equipment before serial transmission. IC Role / Device Role / Timing Role: Provides edge-triggered storage with simultaneous 8-bit capture - synchronizes ADC sampling to system clock domain. Use Value: Achieves <9 ns setup/hold margins at 5 V, supporting >85 MHz sampling clocks; low C_i prevents ADC output loading distortion.

Industrial PLC I/O Modules

Embedded Communication Bus Interface

Use Scenario: Isolating and buffering parallel data between microcontroller GPIO banks and field I/O terminals in programmable logic controllers.

IC Role / Device Role / Timing Role: Acts as an octal register with synchronized latch and bus-isolation capability - holds stable output states during controller reconfiguration or fault recovery.

Use Value: Enables deterministic, glitch-free I/O updates via single-clock edge; 3-state outputs prevent bus contention during hot-swap or diagnostics.

Use Scenario: Interfacing an FPGA's parallel peripheral bus to legacy 8-bit microprocessor address/data lines in test instrumentation.

IC Role / Device Role / Timing Role: Serves as bidirectional bus driver/register - latches outgoing data on CLK↑ and presents inverted, high-drive outputs to the bus.

Use Value: Eliminates need for discrete transceivers or pull-up networks; flow-through layout simplifies routing in constrained FPGA carrier boards.

Automotive Body Control Unit Registers

Test Equipment Signal Conditioning

Use Scenario: Holding configuration bits for LED drivers, relay controllers, and sensor multiplexers in automotive BCMs operating across wide temperature ranges.

IC Role / Device Role / Timing Role: Functions as a nonvolatile shadow register - retains last valid state even during transient OE assertion for diagnostic mode entry.

Use Value: Ensures fail-safe output behavior during firmware updates or CAN message interruptions; −40 °C to +85 °C rating meets AEC-Q100 ambient requirements.

Use Scenario: Capturing and holding analog-to-digital converter parallel output words in automated test equipment before serial transmission.

IC Role / Device Role / Timing Role: Provides edge-triggered storage with simultaneous 8-bit capture - synchronizes ADC sampling to system clock domain.

Use Value: Achieves <9 ns setup/hold margins at 5 V, supporting >85 MHz sampling clocks; low C_i prevents ADC output loading distortion.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT564DBR	ACT family: TTL-compatible input thresholds (V_IH = 2 V min), slightly higher ICC (max 80 µA vs. 40 µA), identical timing and pinout.	Better noise immunity in noisy industrial environments; marginally higher static power draw.	Preferred where legacy TTL-level signaling coexists with CMOS logic; otherwise SN74AC564DBR offers lower quiescent current.
74LVC574APW,118	LVCMOS family: 1.65–3.6 V V_CC range only; non-inverting outputs; 3.3 V optimized; smaller TSSOP-20 (PW) package.	Not suitable for 5 V systems or inverting-bus applications; requires level translation if interfacing with 5 V peripherals.	Select only for 3.3 V-only designs requiring minimal board area; not a drop-in replacement due to voltage and polarity mismatch.

Compared with SN74ACT564DBR and 74LVC574APW,118, the SN74AC564DBR uniquely balances wide V_CC flexibility (2–6 V), inverting 3-state outputs, and low ICC - making it optimal for mixed-voltage industrial registers where bus inversion and power efficiency are jointly critical.

Availability

SN74AC564DBR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, embedded communication bus interfaces, and automotive body control unit registers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74AC564DBR 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 decades of leadership in industrial and automotive interface ICs.

The SN74AC564DBR belongs to TI's 74AC logic family - engineered for high-speed, low-power bus interface and register functions in harsh-environment embedded systems where reliability and voltage flexibility are essential.

FAQ

What is the logic polarity of SN74AC564DBR outputs?

The SN74AC564DBR features inverting 3-state outputs: each Qn output equals the logical complement of its corresponding Dn input after the rising edge of CLK. This inversion is inherent to the device architecture and cannot be disabled. The SN74AC564DBR maintains this behavior across its full 2V–6V V_CC range and operating temperature span.

Does SN74AC564DBR support 3.3 V operation?

Yes, SN74AC564DBR is fully specified for 3.3 V operation (V_CC = 3.3 V ± 0.3 V), with guaranteed timing parameters including f_clock ≥ 60 MHz, t_su ≤ 3 ns, and t_pd ≤ 15.5 ns. Its inputs tolerate up to 6 V, allowing safe interfacing with 5 V signals even when powered from 3.3 V - a key advantage over LVCMOS alternatives.

How is the SN74AC564DBR pinout optimized for PCB layout?

The SN74AC564DBR uses a flow-through architecture: D1–D8 occupy pins 2–9 (left side), GND and CLK are centrally located (pins 10–11), and Q8–Q1 occupy pins 12–19 (right side). This arrangement enables straight-layer signal routing with minimal vias or crossovers - directly supporting compact, high-density industrial control board layouts.

What is the recommended power supply decoupling for SN74AC564DBR?

Texas Instruments specifies a minimum 0.1 µF ceramic capacitor placed as close as possible to the V_CC (pin 20) and GND (pin 10) pins of the SN74AC564DBR. For systems with multiple SN74AC564DBR devices or high switching activity, paralleling a 1 µF capacitor improves broadband noise suppression. The SN74AC564DBR's low ICC (max 40 µA) reduces overall supply current demand but does not relax decoupling requirements.

Can SN74AC564DBR outputs drive a 50-pF bus load at 50 MHz?

Yes - at V_CC = 5 V, the SN74AC564DBR guarantees t_PLH/t_PHL ≤ 11.5 ns and supports f_max = 85 MHz into typical loads. With C_pd = 50 pF and f = 1 MHz, its typical power dissipation capacitance is 50 pF, confirming robust drive capability into 50-pF nets. The SN74AC564DBR's ±24 mA output current ensures clean edges even under such capacitive loading.

SN74AC564DBR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AC

Package/Case:: 20-SSOP (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Standard

Type:: D-Type

Output Type:: Tri-State, Inverted

Number of Elements:: 1

Number of Bits per Element:: 8

Clock Frequency:: 95 MHz

Max Propagation Delay @ V, Max CL:: 10.5ns @ 5V, 50pF

Trigger Type:: Positive Edge

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Iq):: 4 µA

Input Capacitance:: 4.5 pF

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SSOP

SN74AC564DBR FAQ

1.How can I place an order for SN74AC564DBR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AC564DBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74AC564DBR reliable?

The price and inventory of SN74AC564DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC564DBR is usually 5 days.

3.What payment methods are accepted for SN74AC564DBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC564DBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AC564DBR?

SN74AC564DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AC564DBR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74AC564DBR?

For technical support, including SN74AC564DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC564DBR requirements.

6.How does Aetrix verify that SN74AC564DBR is sourced from the original manufacturer or authorized distributors?

All SN74AC564DBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AC564DBR meets industry standards.

7.What is the process for return or replacement of SN74AC564DBR?

All SN74AC564DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC564DBR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74AC564DBR part is unused and in its original packaging.

Return procedure for SN74AC564DBR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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