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Texas Instruments SN74ACT564DBR
- Part No.:
- SN74ACT564DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT564DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,073
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Product details
Overview
SN74ACT564DBR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state inverted outputs, designed for bus interface and data latching in 5-V digital systems. 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 features flow-through pinout for optimized PCB layout.
For engineers reviewing the SN74ACT564DBR datasheet, SN74ACT564DBR pinout, SN74ACT564DBR application, or SN74ACT564DBR equivalent, this device is selected for high-speed bidirectional bus buffering, I/O port expansion, and register-based data capture where low skew, bus-drive capability, and output-enable control are critical.
Technical Context
The SN74ACT564DBR implements eight independent D-type flip-flops, each triggered on the positive edge of CLK. Its 3-state outputs are controlled by a common active-low OE input that does not affect internal latch operation - enabling concurrent data retention or loading while outputs remain high-impedance.
This device uses ACT (Advanced CMOS TTL-compatible) logic, ensuring compatibility with both TTL and CMOS signal levels across its 4.5–5.5 V supply range. Its flow-through architecture places inputs on one side (pins 1–9) and inverted outputs on the opposite side (pins 12–19), minimizing trace crossing and reducing parasitic coupling in dense layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports standard 5-V logic rails with ±10% tolerance for industrial power variation. |
| Max tpd | 8.5 ns at 5 V - enables reliable operation up to 75 MHz clock frequency in synchronous bus applications. |
| Output Drive | ±24 mA at VCC = 4.5 V - sufficient to directly drive 50-pF bus loads without external buffers or pull-ups. |
| Input Compatibility | TTL-voltage compatible - accepts VIH ≥ 2 V and VIL ≤ 0.8 V, interfacing seamlessly with legacy 74LS/74F logic. |
| 3-State Leakage | ±2.5 µA at VCC = 5.5 V - ensures minimal bus leakage during high-impedance state, preserving signal integrity on shared lines. |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial ambient environments without derating. |
| Package Thermal θJA | 70°C/W (DB package) - defines junction-to-ambient thermal resistance for board-level thermal design under continuous load. |
Pinout & Package
SN74ACT564DBR is housed in a 20-pin SSOP (Shrink Small-Outline Package), JEDEC MO-150 compliant, with 0.65 mm lead pitch, body dimensions 7.50 mm × 5.30 mm × 1.95 mm, and gull-wing leads for surface-mount 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; accept TTL/CMOS logic levels up to 5.5 V. |
| 9 | Ground (GND) | Reference return path for all internal logic and output drivers; must be low-impedance connection. |
| 10 | Supply (VCC) | Primary 4.5–5.5 V power rail; bypassing with 0.1 µF ceramic capacitor near pin recommended. |
| 11 | Output Enable (OE) | Active-low control: drives all eight outputs to high-impedance when high; no effect on internal latch state. |
| 12, 13, 14, 15, 16, 17, 18, 19 | Inverted Outputs (1Q–8Q) | Complemented Q outputs; actively driven high/low or placed in high-Z - suitable for direct bus connection. |
| 20 | Clock (CLK) | Common positive-edge-triggered clock input synchronizing all eight flip-flops simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input pins (1–9) and output pins (12–19) are arranged on opposite sides - reduces layer transitions and crosstalk in 2-layer PCBs. |
| 3-State inverted outputs | Outputs drive complementary logic states and enter high-Z independently of clock or data - enables true bidirectional bus arbitration. |
| TTL-compatible inputs | Accepts 2 V VIH and 0.8 V VIL thresholds - interoperates with 74LS, 74F, and other bipolar logic families without level-shifting. |
| High-speed AC performance | 8.5 ns max tpd and 75 MHz max fclock - meets timing requirements for fast microprocessor address/data latching and FIFO staging. |
| Bus-drive capability | ±24 mA output current at 4.5 V - eliminates need for external bus transceivers in moderate-capacitance (<50 pF) backplane or motherboard traces. |
Applications
| Microprocessor Bus Interface | I/O Port Expansion |
|---|---|
Use Scenario: Latching address/data signals between a 16-bit microprocessor and peripheral memory or peripherals. IC Role / Device Role / Timing Role: Acts as an octal transparent latch and bus driver, capturing data on CLK↑ and isolating bus segments via OE control. Use Value: Enables clean separation of address setup and data hold timing while driving capacitive bus loads up to 50 pF without added components. |
Use Scenario: Expanding GPIO count on an MCU with limited native I/O, supporting parallel LCD, keypad, or sensor interfaces. IC Role / Device Role / Timing Role: Functions as an output port register with tri-state control, allowing shared data bus access among multiple peripherals. Use Value: Provides synchronized, glitch-free output updates and bus release via OE, preventing contention during multi-device polling sequences. |
| Bidirectional Data Buffering | Working Register Storage |
Use Scenario: Isolating and conditioning data flow between two asynchronous subsystems (e.g., DSP and FPGA) sharing a common data bus. IC Role / Device Role / Timing Role: Serves as a direction-controlled, edge-triggered buffer with inverted outputs - simplifies control logic for half-duplex protocols. Use Value: Eliminates need for discrete inverters and separate enable logic; OE and CLK jointly manage data direction and timing alignment. |
Use Scenario: Storing intermediate computation results or status flags in real-time control firmware requiring deterministic read/write latency. IC Role / Device Role / Timing Role: Operates as a synchronous working register - holds stable values between clock edges with zero hold-time requirement (th = 1 ns min). Use Value: Guarantees metastability-free sampling of asynchronous inputs when used with proper setup time (tsu = 3 ns min at 5 V), improving system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574DBR | Non-inverting outputs; identical timing, voltage, and package specs. | Used where complemented output logic would require additional inversion in downstream logic. | Select when system logic requires true (non-inverted) Q outputs - avoids extra gate count and propagation delay. |
| SN74LVC574APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), same pinout but different VCC/GND placement. | Targeted for mixed-voltage 3.3-V systems; not 5-V tolerant on inputs unless explicitly rated. | Choose for cost-sensitive, low-power 3.3-V designs where 5-V compatibility is unnecessary and board space is constrained. |
Compared with SN74ACT564DBR, SN74ACT574DBR provides functional equivalence with non-inverted outputs - ideal for direct replacement where inversion is undesirable - while SN74LVC574APWR offers voltage scalability at the expense of 5-V interoperability and higher noise margin.
Availability
SN74ACT564DBR is available at Aetrix Electronics and suitable for microprocessor bus interface, I/O port expansion, bidirectional data buffering, and working register storage requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for SN74ACT564DBR 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 50 years of innovation in high-reliability digital interface ICs.
The SN74ACT564DBR belongs to TI's ACT logic family - engineered for robust 5-V TTL/CMOS interoperability, high-speed bus driving, and industrial-grade timing stability in real-world PCB environments.
FAQ
What is the function of the OE pin on the SN74ACT564DBR?
The OE (Output Enable) pin on the SN74ACT564DBR is an active-low control that places all eight inverted Q outputs into a high-impedance state when asserted high. It does not affect internal flip-flop operation - data can be latched or retained while outputs are disabled. This allows safe bus sharing and prevents contention during system initialization or mode switching in the SN74ACT564DBR.
Does the SN74ACT564DBR support 3.3-V input logic levels?
No - the SN74ACT564DBR is a 5-V-only device with TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V). While it accepts input voltages up to 5.5 V, it is not guaranteed to correctly interpret 3.3-V logic highs in all conditions without marginality. For mixed-voltage systems, level translation or use of 3.3-V–compatible alternatives like SN74LVC574APWR is recommended instead of relying on the SN74ACT564DBR.
What is the maximum clock frequency supported by the SN74ACT564DBR?
The SN74ACT564DBR supports a maximum clock frequency of 75 MHz over its full operating temperature range (–40°C to +85°C) at VCC = 5 V. At 25°C, the datasheet specifies up to 85 MHz for SN54ACT564 and 75 MHz for SN74ACT564 - the latter rating applies to the SN74ACT564DBR and ensures timing compliance under worst-case industrial conditions.
Can the SN74ACT564DBR drive a 100-pF bus load?
The SN74ACT564DBR is characterized for 50-pF loads per output, with timing and drive specifications guaranteed up to that capacitance. Driving 100-pF loads may increase propagation delay beyond 8.5 ns and reduce noise margins - it is not recommended without validation. For heavier loads, consider buffering or using devices with higher drive strength; the SN74ACT564DBR is optimized for ≤50-pF bus segments.
Is the SN74ACT564DBR pin-compatible with the SN74ACT574DBR?
Yes - the SN74ACT564DBR and SN74ACT574DBR share identical 20-pin SSOP (DB) packages, pin assignments, supply connections, and timing characteristics. The sole functional difference is output polarity: SN74ACT564DBR provides inverted Q outputs, while SN74ACT574DBR provides true Q outputs. This makes them drop-in replacements where output inversion is accounted for in system logic design.
SN74ACT564DBR 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
SN74ACT564DBR FAQ
1.How can I place an order for SN74ACT564DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT564DBR 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 SN74ACT564DBR reliable?
The price and inventory of SN74ACT564DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT564DBR is usually 5 days.
3.What payment methods are accepted for SN74ACT564DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT564DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT564DBR?
SN74ACT564DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT564DBR 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 SN74ACT564DBR?
For technical support, including SN74ACT564DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT564DBR requirements.
6.How does Aetrix verify that SN74ACT564DBR is sourced from the original manufacturer or authorized distributors?
All SN74ACT564DBR 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 SN74ACT564DBR meets industry standards.
7.What is the process for return or replacement of SN74ACT564DBR?
All SN74ACT564DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT564DBR, 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 SN74ACT564DBR part is unused and in its original packaging.
Return procedure for SN74ACT564DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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