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Texas Instruments SN74ACT564PW
- Part No.:
- SN74ACT564PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT564PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
SN74ACT564PW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverted outputs, designed for bus-oriented applications requiring high-speed data latching and bidirectional bus driving. It operates at 4.5–5.5 V, delivers 8.5 ns max propagation delay at 5 V, supports TTL-voltage-compatible inputs, and features flow-through pinout for optimized PCB layout.
For engineers reviewing the SN74ACT564PW datasheet, SN74ACT564PW pinout, SN74ACT564PW application, or SN74ACT564PW equivalent, this page provides verified functional identity, timing behavior under 5 V operation, 3-state output control logic, thermal resistance (126.2°C/W), and validated alternatives for buffer register and I/O port designs.
Technical Context
The SN74ACT564PW implements eight independent D-type flip-flops triggered on the rising edge of CLK, with each Q output inverted relative to its D input. Its buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch states.
It uses ACT (Advanced CMOS TTL-compatible) logic family architecture, ensuring compatibility with TTL input thresholds while delivering CMOS-level power efficiency and noise immunity. The device supports direct connection to capacitive bus lines up to 50 pF load per output, with guaranteed 24 mA drive strength in both sourcing and sinking directions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across industrial-grade 5 V supply tolerances. |
| Max tpd | 8.5 ns at 5 V - Enables reliable 75 MHz clock operation in synchronous bus interfaces. |
| Output Drive | ±24 mA - Sufficient to drive standard TTL loads and terminated transmission lines directly. |
| Input Compatibility | TTL-voltage compatible - Accepts VIH ≥ 2 V and VIL ≤ 0.8 V, eliminating level-shifting in mixed-logic systems. |
| 3-State Enable | Active-low OE - Allows shared bus arbitration without external gating logic or pull-ups. |
| Operating Temp | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
| RθJA | 126.2°C/W (TSSOP-20) - Requires thermal-aware PCB layout with adequate copper pour for sustained 5 V operation. |
Pinout & Package
TSSOP-20 package: 6.5 mm × 6.4 mm body size, 1.2 mm max height, lead pitch 0.65 mm, JEDEC MO-153 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state enable controlling all eight outputs simultaneously. |
| 2–9 | 1D–8D | Eight asynchronous data inputs, each feeding one D-type flip-flop stage. |
| 10 | GND | Power return reference for logic and output stages; must be low-inductance connection. |
| 11 | CLK | Rising-edge clock input synchronizing all eight flip-flops to a common timing edge. |
| 12–19 | 8Q–1Q | Inverted Q outputs (Q̅), flow-through arranged to minimize trace crossovers on PCB. |
| 20 | VCC | Positive supply rail; requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input pins (2–9) and output pins (12–19) aligned on opposite sides to eliminate layer jumps and reduce signal skew. |
| Full parallel access | All eight D inputs accept new data simultaneously on each CLK edge, enabling single-cycle register loading. |
| 3-state inverted outputs | Outputs drive bus lines directly in active state and present <1 µA leakage in high-Z mode, eliminating need for external pull-ups. |
| TTL-compatible inputs | Accepts standard TTL logic levels (0.8 V/2.0 V thresholds) while powered from 5 V, simplifying interface with legacy controllers. |
| Bus-oriented design | Optimized for bidirectional bus drivers and I/O ports where multiple devices share a common data path under OE arbitration. |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
Use Scenario: Isolating and latching sensor/actuator signals in modular I/O racks with shared backplane data buses. IC Role / Device Role / Timing Role: Octal register holding real-time status bits synchronized to system clock; OE enables hot-swap-safe bus disconnection. Use Value: Eliminates discrete buffers and reduces component count by integrating eight latched 3-state drivers in one TSSOP-20 footprint. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller-based host systems via level-translated data paths. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with direction control replaced by OE-driven 3-state management and CLK-synchronized sampling. Use Value: Provides deterministic setup/hold timing (tsu = 2.5 ns, th = 1 ns) and 24 mA drive to meet legacy bus electrical specifications without external drivers. |
| Test Equipment Digital Pattern Generators | Automated Test Fixture Controllers |
Use Scenario: Generating precise, synchronized stimulus waveforms for digital IC validation using programmable pattern memory. IC Role / Device Role / Timing Role: Output register staging precomputed test vectors; CLK aligns vector edges to system timing reference. Use Value: 8.5 ns max tpd ensures sub-10 ns edge placement accuracy critical for high-speed digital test coverage. |
Use Scenario: Controlling relay banks, LED indicators, and opto-isolated inputs in production-line test jigs with shared control bus. IC Role / Device Role / Timing Role: Latched output expander buffering MCU GPIOs; OE allows dynamic bus reconfiguration during test sequence changes. Use Value: Flow-through pinout simplifies routing in dense fixture PCBs, reducing trace length mismatch and improving signal integrity across 20-channel control bus. |
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 |
|---|---|---|---|
| SN74ACT574PW | Non-inverting Q outputs; identical timing, voltage, and package specs. | Required where bus drivers must preserve logic polarity (e.g., address latching). | Select SN74ACT574PW when output inversion is not desired; otherwise SN74ACT564PW is optimal for inverted-bus protocols. |
| 74LVC574APW | Lower VCC range (1.65–3.6 V); 3.3 V native operation; 6.7 ns tpd at 3.3 V. | Suitable for mixed-voltage systems but incompatible with 5 V-only buses without level translation. | Choose 74LVC574APW only in 3.3 V domains; SN74ACT564PW remains necessary for 5 V industrial bus compliance. |
Compared with SN74ACT564PW, SN74ACT574PW removes output inversion while retaining identical timing and drive strength-ideal for non-inverted bus architectures-whereas 74LVC574APW shifts to 3.3 V operation with faster propagation but sacrifices 5 V interoperability and bus-drive capability.
Availability
SN74ACT564PW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and automated test fixture controllers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT564PW 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 and automotive electronics.
The SN74ACT564PW belongs to TI's ACT logic family, engineered for robust 5 V bus interfacing in industrial automation, test equipment, and legacy system upgrades where TTL compatibility and high drive strength are essential.
FAQ
What is the function of the OE pin on the SN74ACT564PW?
The OE (Output Enable) pin on the SN74ACT564PW is an active-low control that places all eight Q outputs into high-impedance state when asserted (OE = LOW), regardless of CLK or D input states. It does not affect internal flip-flop operation, allowing data retention or updates while outputs remain disconnected from the bus. This behavior is confirmed in the Function Table (Table 6-1) and Detailed Description section of the official datasheet.
Does the SN74ACT564PW support 3.3 V operation?
No, the SN74ACT564PW is specified only for 4.5 V to 5.5 V supply operation per Recommended Operating Conditions (Section 4.2). Its TTL-compatible inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, but internal logic thresholds and output drive strength are characterized exclusively at 5 V. Attempting 3.3 V operation violates datasheet limits and risks unreliable switching or excessive ICC current.
What is the maximum clock frequency supported by the SN74ACT564PW?
The SN74ACT564PW supports a maximum clock frequency of 75 MHz under recommended operating conditions (VCC = 5 V, TA = –40°C to +85°C), as specified in Section 4.5 Timing Requirements. At 25°C, fmax reaches 85 MHz. This is derived from minimum pulse width (tw = 3 ns) and verified by switching characteristics tables showing tPLH/tPHL ≤ 11.5 ns.
How does the SN74ACT564PW differ from the SN74ACT574PW?
The SN74ACT564PW provides inverted Q outputs (Q̅), while the SN74ACT574PW provides true Q outputs - all other electrical, timing, and packaging specifications are identical. Both use the same ACT logic family, share 8.5 ns max tpd at 5 V, and offer identical 3-state control via OE. The choice depends solely on whether bus polarity inversion is required in the target application.
Is the SN74ACT564PW pin-compatible with other package variants like SN74ACT564N or SN74ACT564DWR?
Yes, all SN74ACT564 variants - including SN74ACT564PW (TSSOP-20), SN74ACT564N (PDIP-20), and SN74ACT564DWR (SOIC-20) - share identical pin configuration and function mapping per Figure 3-1 and Table 3-1. Pin 1 is OE, pins 2–9 are D inputs, pin 10 is GND, pin 11 is CLK, pins 12–19 are Q outputs (8Q to 1Q), and pin 20 is VCC across all packages.
SN74ACT564PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT564PW FAQ
1.How can I place an order for SN74ACT564PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT564PW 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 SN74ACT564PW reliable?
The price and inventory of SN74ACT564PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT564PW is usually 5 days.
3.What payment methods are accepted for SN74ACT564PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT564PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT564PW?
SN74ACT564PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT564PW 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 SN74ACT564PW?
For technical support, including SN74ACT564PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT564PW requirements.
6.How does Aetrix verify that SN74ACT564PW is sourced from the original manufacturer or authorized distributors?
All SN74ACT564PW 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 SN74ACT564PW meets industry standards.
7.What is the process for return or replacement of SN74ACT564PW?
All SN74ACT564PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT564PW, 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 SN74ACT564PW part is unused and in its original packaging.
Return procedure for SN74ACT564PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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