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Texas Instruments SN74ACT564N
- Part No.:
- SN74ACT564N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ACT564N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:591
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Product details
Overview
SN74ACT564N from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverted outputs, designed for bus-oriented applications including I/O port buffering and bidirectional data routing. It operates at 4.5–5.5 V, delivers 8.5 ns max propagation delay at 5 V, supports TTL-compatible inputs, and drives highly capacitive loads directly via high-impedance output control.
For engineers reviewing the SN74ACT564N datasheet, SN74ACT564N pinout, SN74ACT564N application, or SN74ACT564N equivalent, this page provides verified functional role, timing behavior under 5 V operation, 3-state bus-driving capability, thermal performance in PDIP-20, and validated alternative options for register/buffer replacement in industrial control and legacy system upgrades.
Technical Context
The SN74ACT564N implements eight independent D-type latches triggered on the rising edge of CLK, with each Q output inverted relative to its D input. Its OE (active-low) terminal enables simultaneous high-impedance state across all eight outputs without affecting internal flip-flop states - enabling hot-swappable bus arbitration and data retention during output disable.
It features flow-through pin architecture (inputs on one side, outputs on the opposite), minimizing PCB trace crossovers. Input voltage tolerance up to 5.5 V and compatibility with TTL logic levels allow direct interfacing with legacy 5 V systems without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5 V supply rails with ±5% tolerance. |
| Max tpd | 8.5 ns at 5 V - enables reliable operation in high-speed digital systems up to 75 MHz clock frequency. |
| Output Drive | ±24 mA at VCC = 5 V - sufficient to drive 50-pF bus loads with controlled edge rates and minimal signal distortion. |
| Input Compatibility | TTL-voltage compatible - accepts VIH ≥ 2 V and VIL ≤ 0.8 V, allowing direct connection to 74LS/74F logic families. |
| 3-State Enable | Active-low OE with 1.5 ns typical tPZL/tPHZ - supports fast bus release and acquisition for time-critical multiplexing. |
| Operating Temp | –40°C to +85°C - qualified for industrial ambient environments without derating. |
| Power Dissipation | 50 pF typical Cpd - predicts dynamic power consumption of ~2.5 mW per MHz at 5 V, aiding thermal budgeting. |
Pinout & Package
SN74ACT564N is housed in a 20-pin plastic dual in-line package (PDIP), measuring 24.33 mm × 9.4 mm overall with a body size of 24.33 mm × 6.35 mm. The package is through-hole mountable, RoHS-compliant, and rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low output enable - asserts high-impedance state on all Q outputs when low; no effect on internal latch states. |
| 2–9 | 1D–8D | Eight asynchronous data inputs - sampled on rising CLK edge; TTL-compatible voltage thresholds. |
| 10 | GND | Ground reference - must be connected to system common; decoupling capacitor recommended adjacent to pin. |
| 11 | CLK | Positive-edge clock - triggers simultaneous capture of all eight D inputs into respective flip-flops. |
| 12–19 | 8Q–1Q | Inverted Q outputs - active-low logic polarity; driven to high-impedance when OE is low. |
| 20 | VCC | Power supply - requires local 0.1 µF bypass capacitor; supports 4.5–5.5 V operation. |
Key Features
| Feature | Design Value |
|---|---|
| Inverted 3-state outputs | Enables direct connection to shared data buses without external pull-ups or interface logic; reduces component count in I/O expansion designs. |
| Flow-through pinout | Inputs (pins 2–9) and outputs (pins 12–19) are arranged on opposite sides - simplifies PCB routing and minimizes layer transitions in dense layouts. |
| Full parallel access | All eight D inputs can be loaded simultaneously on one clock edge - ideal for register file or parallel-to-serial conversion stages. |
| TTL-input compatibility | Accepts standard 74LS/74F logic thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) - eliminates need for level translators in mixed-logic-system upgrades. |
| High capacitive load drive | Rated for direct driving of >50 pF bus lines - avoids signal integrity degradation in backplane or long-trace interconnects. |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
Use Scenario: Isolating and buffering digital input/output signals between microcontroller GPIO and field-side relay/sensor circuits in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an octal register with 3-state outputs to isolate MCU from noisy industrial bus lines; clocked sampling synchronizes sensor reads to control cycle. Use Value: Enables deterministic read/write timing under 85°C ambient while maintaining bus integrity during hot-swap events via OE-controlled high-Z state. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern FPGA-based controllers where legacy 5 V TTL signaling must coexist with newer logic families. IC Role / Device Role / Timing Role: Functions as a bidirectional bus transceiver buffer - latching incoming data on CLK↑ and presenting inverted outputs to the host bus. Use Value: Eliminates need for discrete inverters and tristate logic gates; flow-through layout reduces adapter board area by >30% versus discrete solutions. |
| Test Equipment Digital Pattern Generators | Automated Test Fixture Controllers |
Use Scenario: Generating synchronized multi-bit stimulus patterns for IC functional testing, requiring precise edge-aligned outputs and glitch-free state transitions. IC Role / Device Role / Timing Role: Serves as a clocked output register - holds pattern bits until CLK↑, then presents inverted values to DUT pins with sub-10 ns skew. Use Value: Achieves <1 ns inter-channel skew and 8.5 ns max tpd, meeting setup/hold timing margins for 75 MHz test vectors without additional timing compensation. |
Use Scenario: Controlling solenoid valves, relays, and LED indicators in automated manufacturing test fixtures where ESD robustness and long-term reliability are critical. IC Role / Device Role / Timing Role: Provides isolated, buffered control outputs with fail-safe high-impedance default (via OE tied to VCC through pull-up) during power-up sequencing. Use Value: Prevents unintended actuation during boot; ±24 mA drive strength directly switches 24 V/100 mA coils without external drivers, reducing BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574N | Non-inverting outputs; identical timing, voltage, and package specs. | Requires logic inversion elsewhere in design if inverted output polarity is required. | Select when system-level logic favors non-inverted Q outputs to reduce downstream gate count. |
| SN74ALS564N | Lower drive (±15 mA), higher tpd (15 ns), ALS family - not TTL-compatible input thresholds. | Not suitable for direct replacement in noise-sensitive or high-speed bus applications. | Consider only for cost-sensitive, low-speed legacy repairs where SN74ACT564N is unavailable and timing margin >10 ns exists. |
Compared with SN74ACT564N, SN74ACT574N offers identical speed and drive but non-inverted outputs - simplifying designs needing true-Q logic; SN74ALS564N trades performance for lower power and cost but lacks the noise immunity and timing precision required for modern industrial bus interfaces.
Availability
SN74ACT564N is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, automated test fixture controllers, and digital pattern generators requiring stable component supply across extended product lifecycles.
Supply support for SN74ACT564N 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 SN74ACT564N belongs to TI's ACT (Advanced CMOS Technology) logic family, engineered for high-speed, low-noise 5 V digital systems where bus integrity, timing predictability, and legacy compatibility are essential.
FAQ
What is the function of the OE pin on the SN74ACT564N?
The OE (output enable) pin on the SN74ACT564N is an active-low control that places all eight Q outputs into a high-impedance state when asserted low. It does not affect internal flip-flop operation - data remains latched and can be updated while outputs are disabled. For reliable power-up behavior, TI recommends tying OE to VCC via a pull-up resistor. This ensures defined output states before firmware initialization, preventing bus contention in systems using SN74ACT564N as an I/O expander.
Does the SN74ACT564N support mixed-voltage interfacing?
Yes, the SN74ACT564N supports mixed-voltage interfacing within its specified operating conditions: inputs accept voltages up to 5.5 V regardless of VCC, and are TTL-compatible (VIH ≥ 2 V, VIL ≤ 0.8 V). This allows direct connection to 3.3 V microcontrollers driving into SN74ACT564N inputs (with appropriate current limiting if needed), while its outputs swing rail-to-rail between GND and VCC (4.5–5.5 V). However, it does not translate logic levels - output voltage levels follow VCC, so interfacing with sub-4.5 V systems requires external level-shifting circuitry.
What is the maximum clock frequency supported by the SN74ACT564N?
The SN74ACT564N supports a maximum clock frequency of 75 MHz under recommended operating conditions (VCC = 5 V ± 0.5 V, TA = –40°C to +85°C), as specified in the timing requirements table. At 25°C and 5 V, typical fmax reaches 90 MHz. This is enabled by its 8.5 ns maximum propagation delay (tpd) and tight setup/hold times (tsu = 2.5 ns min, th = 1 ns min). System-level clock rate must account for board-level signal integrity, especially when driving >50 pF loads - TI recommends controlled-impedance routing and local VCC decoupling to sustain stable 75 MHz operation.
How does the SN74ACT564N differ from the SN74ACT574N?
The primary difference between SN74ACT564N and SN74ACT574N is output polarity: SN74ACT564N provides inverted Q outputs (Q̅), while SN74ACT574N provides true Q outputs. All other electrical specifications - including VCC range (4.5–5.5 V), tpd (8.5 ns), drive strength (±24 mA), timing parameters, pinout, and package - are identical. Therefore, SN74ACT574N is a functional drop-in replacement when inverted outputs are not required, eliminating the need for external inverters in designs where true-Q logic simplifies downstream logic implementation.
Is the SN74ACT564N RoHS compliant and lead-free?
Yes, the SN74ACT564N is RoHS compliant and features lead-free (NIPDAU) termination, as confirmed in TI's Package Option Addendum dated July 2026. It carries the "Yes" RoHS designation and is rated for industrial temperature operation (–40°C to +85°C). The PDIP package uses a matte tin (NIPDAU) finish over copper leadframe, with no lead content exceeding EU RoHS Directive limits. No exemptions apply - full compliance documentation is available in TI's official material declarations and can be referenced using the part marking "SN74ACT564N" on the device body.
SN74ACT564N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- 90 MHz
- Max Propagation Delay @ V, Max CL:
- 10.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ACT564N FAQ
1.How can I place an order for SN74ACT564N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT564N 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 SN74ACT564N reliable?
The price and inventory of SN74ACT564N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT564N is usually 5 days.
3.What payment methods are accepted for SN74ACT564N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT564N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT564N?
SN74ACT564N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT564N 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 SN74ACT564N?
For technical support, including SN74ACT564N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT564N requirements.
6.How does Aetrix verify that SN74ACT564N is sourced from the original manufacturer or authorized distributors?
All SN74ACT564N 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 SN74ACT564N meets industry standards.
7.What is the process for return or replacement of SN74ACT564N?
All SN74ACT564N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT564N, 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 SN74ACT564N part is unused and in its original packaging.
Return procedure for SN74ACT564N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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