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Texas Instruments SN74ACT564DBRE4
- Part No.:
- SN74ACT564DBRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT564DBRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,831
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Product details
Overview
SN74ACT564DBRE4 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, accepts TTL-compatible inputs, and drives capacitive or low-impedance loads directly in systems such as industrial I/O controllers and memory-mapped peripheral interfaces.
For engineers reviewing the SN74ACT564DBRE4 datasheet, SN74ACT564DBRE4 pinout, SN74ACT564DBRE4 application, or SN74ACT564DBRE4 equivalent, this device is selected for high-speed bidirectional bus buffering where precise clock-edge sampling, output enable control, and flow-through PCB layout optimization are required.
Technical Context
The SN74ACT564DBRE4 implements eight independent D-type latches triggered on the positive clock edge, each feeding an inverting 3-state output buffer controlled by a shared OE input. Its logic diagram confirms that OE does not affect internal flip-flop state retention - data can be loaded or held while outputs remain high-impedance.
This device uses ACT (Advanced CMOS TTL-compatible) technology, ensuring compatibility with both 5-V TTL logic levels and CMOS power efficiency. Its flow-through pinout (D inputs on one side, Q outputs on the opposite) minimizes trace crossovers and supports compact, noise-resilient PCB routing for parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures robust operation across standard 5-V supply tolerances and brown-out resilience. |
| tpd (Max) | 8.5 ns at 5 V - enables reliable operation up to 75 MHz clock frequency in synchronous bus systems. |
| IOL / IOH | ±24 mA - provides sufficient drive strength to terminate and switch typical 50–75 Ω transmission lines without external buffers. |
| tsu / th | 3 ns setup / 1 ns hold - defines minimum D-input stability window relative to CLK↑, critical for timing closure in FPGA- or MCU-connected peripherals. |
| IOZ (High-Z Leakage) | ±2.5 µA at 5.5 V - guarantees negligible bus loading when outputs are disabled, preserving signal integrity on shared data lines. |
| Input Compatibility | TTL-voltage compatible - accepts 0.8 V/2.0 V VIH/VIL thresholds, allowing direct interfacing with legacy 5-V TTL logic families. |
| Package Thermal θJA | 70 °C/W (DB package) - determines junction temperature rise under sustained 24-mA switching loads, informing thermal margin in dense layouts. |
Pinout & Package
SN74ACT564DBRE4 is housed in a 20-pin SSOP (Shrink Small-Outline Package), designated DB, with 0.65 mm lead pitch and JEDEC MO-150 compliance. The package measures 7.50 mm × 5.10 mm × 1.95 mm (L × W × H) and features gull-wing leads for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Data Inputs (1D–8D) | Asynchronous D inputs for each of eight flip-flops; sampled on rising CLK edge and inverted at corresponding Q outputs. |
| 9 | GND | Power ground reference for all internal logic and output drivers; must be low-inductance connected to system ground plane. |
| 10 | VCC | Positive supply rail (4.5–5.5 V); requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 11, 12, 13, 14, 15, 16, 17, 18 | Inverted Outputs (1Q–8Q) | Complemented latched outputs; placed in high-impedance state when OE is high, enabling bidirectional bus sharing. |
| 19 | CLK | Global clock input; positive-edge sensitive; must meet 3.5 ns minimum pulse width and ≤8 ns/V input transition rate. |
| 20 | OE | Active-low output enable; asynchronous control - outputs enter high-Z immediately upon OE assertion, independent of CLK or D state. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input (D) and output (Q) pins arranged on opposite sides of package - eliminates layer jumps and reduces crosstalk in parallel data bus routing. |
| 3-State inverted outputs | Eight independent inverted Q outputs with common OE - enables direct connection to shared data buses without external inverters or pull-ups. |
| Full parallel access | All eight D inputs and Q outputs accessible simultaneously - supports byte-wide register loading and readback without multiplexing overhead. |
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max - interoperates seamlessly with legacy 74LS, 74F, and microcontroller GPIOs operating at 5 V. |
| High-impedance state retention | OE disables outputs without affecting internal flip-flop states - allows data to be held and updated asynchronously while bus remains free. |
Applications
| Industrial I/O Expansion | Memory-Mapped Peripheral Interface |
|---|---|
|
Use Scenario: Adding isolated 8-bit parallel I/O to a PLC backplane using a 5-V microcontroller with limited GPIO count. IC Role / Device Role / Timing Role: Acts as output latch and input buffer - D inputs capture status signals, Q outputs drive relay drivers or LED indicators synchronized to system clock. Use Value: Eliminates need for discrete level shifters or bus transceivers due to TTL compatibility and 24-mA drive capability. |
Use Scenario: Interfacing an FPGA-based video controller to external SRAM or character LCD with shared address/data bus. IC Role / Device Role / Timing Role: Functions as bidirectional data bus transceiver - OE controlled by FPGA to isolate SRAM during display refresh cycles. Use Value: Flow-through pinout simplifies 8-bit data path routing; 8.5 ns tpd ensures timing margin for 75-MHz pixel clocks. |
| Legacy System Bus Buffering | Test Equipment Digital Pattern Generator |
|
Use Scenario: Upgrading a vintage test instrument's CPU bus to support faster peripheral response without redesigning motherboard traces. IC Role / Device Role / Timing Role: Serves as clocked register between CPU data bus and slower DAC or ADC interface logic. Use Value: 3-state outputs prevent contention during DMA transfers; OE tied to CPU RD/WR strobes enables cycle-accurate bus arbitration. |
Use Scenario: Generating repeatable 8-bit digital stimulus waveforms in automated functional test fixtures. IC Role / Device Role / Timing Role: Stores pattern words from microcontroller RAM and clocks them out synchronously to DUT inputs via CLK and OE sequencing. Use Value: Independent hold of internal state during OE high allows seamless waveform transitions without glitching on output bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574DBR | Non-inverting Q outputs; identical pinout, timing, and electrical specs otherwise. | Required where bus polarity must match input data without inversion (e.g., direct connection to non-inverting memory data lines). | Select SN74ACT574DBR if system logic expects true (non-inverted) output mapping; no PCB change needed. |
| 74ACT273DBR | Same ACT family but with non-3-state outputs and different pin assignment (no OE, Q outputs on same side as D). | Suitable only for unidirectional register applications where bus sharing is unnecessary and board layout permits non-flow-through routing. | Choose 74ACT273DBR only when output enable is not required and space allows revised trace layout. |
Compared with SN74ACT564DBRE4, SN74ACT574DBR offers functional equivalence with true outputs - ideal for polarity-sensitive buses - while 74ACT273DBR sacrifices bus flexibility for simpler control but demands layout revision and lacks high-impedance isolation.
Availability
SN74ACT564DBRE4 is available at Aetrix Electronics and suitable for industrial I/O expansion, memory-mapped peripheral interfacing, and legacy system bus buffering requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for SN74ACT564DBRE4 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 decades of heritage in industry-standard logic families and automotive-grade reliability.
The SN74ACT564DBRE4 belongs to TI's Advanced CMOS (ACT) logic product line, engineered for high-speed, low-power 5-V systems requiring TTL compatibility, bus-driving capability, and robust noise immunity in industrial and instrumentation environments.
FAQ
What is the function of the OE pin on the SN74ACT564DBRE4?
The OE (Output Enable) pin on the SN74ACT564DBRE4 is an active-low control that places all eight inverted Q outputs into a high-impedance state when asserted high. It operates asynchronously - internal flip-flop states remain unchanged regardless of OE status, allowing data to be retained or updated while the bus is released. This behavior is confirmed in the function table and logic diagram of the SN74ACT564DBRE4 datasheet.
Does the SN74ACT564DBRE4 support mixed-voltage operation, such as interfacing with 3.3-V logic?
No, the SN74ACT564DBRE4 is specified only for 4.5 V to 5.5 V VCC operation and TTL-compatible input thresholds (VIH = 2.0 V min). Its inputs tolerate up to 5.5 V, but it does not support 3.3-V logic levels natively - direct connection to 3.3-V devices requires level-shifting circuitry. The SN74ACT564DBRE4 datasheet explicitly defines VIH/VIL at 5-V conditions and does not characterize performance below 4.5 V.
Can the SN74ACT564DBRE4 be used as a level shifter between 5-V and 3.3-V systems?
No, the SN74ACT564DBRE4 is not designed or characterized as a level shifter. While its inputs accept voltages up to 5.5 V, its outputs swing rail-to-rail (0 V to VCC) and cannot safely drive 3.3-V inputs without risk of overvoltage damage. TI does not specify the SN74ACT564DBRE4 for mixed-voltage translation; dedicated level translators like TXB0108 or SN74AVCH series are recommended instead.
What is the maximum clock frequency supported by the SN74ACT564DBRE4?
The SN74ACT564DBRE4 supports a maximum clock frequency of 75 MHz over the commercial temperature range (–40°C to 85°C), as specified in the timing requirements table. This limit derives from the 3.5 ns minimum CLK pulse width and 3 ns setup time, validated at VCC = 5 V ± 0.5 V. At TA = 25°C, fmax reaches 90 MHz, but system design must adhere to the 75-MHz rating for full-range reliability.
Is the SN74ACT564DBRE4 pin-compatible with other packages in the 'ACT564 family, such as SN74ACT564DWR or SN74ACT564NSR?
Yes, the SN74ACT564DBRE4 shares identical pinout and functionality with all other SOIC, SSOP, and TSSOP variants of the 'ACT564 family, including SN74ACT564DWR and SN74ACT564NSR. All use the same 20-pin topology (D inputs on left, Q outputs on right, OE/CLK/VCC/GND in fixed positions), enabling drop-in replacement across DB, DW, and NS packages without PCB modification.
SN74ACT564DBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SSOP
SN74ACT564DBRE4 FAQ
1.How can I place an order for SN74ACT564DBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT564DBRE4 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 SN74ACT564DBRE4 reliable?
The price and inventory of SN74ACT564DBRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT564DBRE4 is usually 5 days.
3.What payment methods are accepted for SN74ACT564DBRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT564DBRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT564DBRE4?
SN74ACT564DBRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT564DBRE4 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 SN74ACT564DBRE4?
For technical support, including SN74ACT564DBRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT564DBRE4 requirements.
6.How does Aetrix verify that SN74ACT564DBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ACT564DBRE4 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 SN74ACT564DBRE4 meets industry standards.
7.What is the process for return or replacement of SN74ACT564DBRE4?
All SN74ACT564DBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT564DBRE4, 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 SN74ACT564DBRE4 part is unused and in its original packaging.
Return procedure for SN74ACT564DBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ACT564DBRE4 Tags
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SN74HC74DR
Texas Instruments
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SN74HC574DWR
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