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Texas Instruments SN74AC564DWR
- Part No.:
- SN74AC564DWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC564DWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,675
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Product details
Overview
SN74AC564DWR 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 from 2V to 6V VCC, delivers 9ns max propagation delay at 5V, and supports rising-edge clock triggering with full parallel data loading.
For engineers reviewing the SN74AC564DWR datasheet, SN74AC564DWR pinout, SN74AC564DWR application, or SN74AC564DWR equivalent, this device is selected for high-speed bidirectional bus buffering, I/O port expansion, and working register implementation where low-power AC logic performance and output bus isolation are required.
Technical Context
The SN74AC564DWR implements eight independent D-type latches synchronized to the rising edge of a common CLK input, with all Q outputs inverted relative to their D inputs. Its buffered OE input controls simultaneous 3-state output enable/disable without affecting internal flip-flop state retention.
It features flow-through pin architecture (D1–D8 on left, Q1–Q8 on right, CLK and OE centrally located), enabling minimal trace crossing on PCBs. The device meets AC logic voltage thresholds across 2V–6V supply range and drives capacitive bus loads directly without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing and legacy 5V or modern 3.3V domains |
| Max tpd | 9ns at 5V - enables reliable operation up to 85MHz clock frequency in high-speed digital control paths |
| Output Drive | ±24mA at 5.5V - sufficient to drive standard TTL/CMOS bus loads without external buffers |
| Input Voltage Tolerance | Inputs accept up to 6V regardless of VCC - allows safe interfacing with higher-voltage logic without level shifters |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded systems and automotive body electronics |
| Power Dissipation Cap. | 50pF typical - defines dynamic power consumption under 1MHz switching with 50pF load |
| 3-State Leakage | ±5µA max at 5.5V - ensures minimal bus leakage during high-impedance hold, critical for multi-drop bus integrity |
Pinout & Package
SN74AC564DWR is packaged in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm with 12.80mm × 7.50mm body size, RoHS-compliant NIPDAU lead finish, and moisture sensitivity level 1 (260°C peak reflow).
| 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 sampled on CLK rising edge; inverted at Q outputs |
| 10 (GND) | Ground reference | Common return path for all signals and power; must be low-inductance connection for noise immunity |
| 11 (CLK) | Clock input | Rising-edge triggered; synchronizes all eight flip-flops simultaneously with minimal skew |
| 12–19 (Q8–Q1) | Inverting 3-state outputs | Outputs mirror D inputs with inversion; enter high-Z when OE = high, isolating bus lines |
| 20 (VCC) | Positive supply | Single power rail supporting 2V–6V; requires local 0.1µF bypass capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Minimizes PCB trace crossovers and routing congestion in dense bus-interface layouts |
| Full parallel access | Enables simultaneous loading of all eight bits via D1–D8, eliminating serial shift overhead |
| Inverting 3-state outputs | Provides direct bus-driving capability with polarity inversion and contention-free shared-bus operation |
| Voltage-tolerant inputs | Accepts 0–6V input signals independent of VCC, simplifying inter-voltage-domain signal routing |
| Low propagation delay | 9ns max at 5V supports >85MHz system clocks, meeting timing budgets in real-time control logic |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Adding isolated, high-drive digital I/O channels to programmable logic controllers handling sensor inputs and actuator outputs. IC Role / Device Role / Timing Role: Acts as an octal buffer register with 3-state outputs, latching parallel sensor data on CLK edge and driving relay/LED loads via inverted outputs. Use Value: Eliminates need for discrete level shifters and pull-up resistors while maintaining bus integrity during hot-swap I/O module insertion. | Use Scenario: Managing door lock status, window position, and mirror control signals in centralized body electronics units. IC Role / Device Role / Timing Role: Functions as a bidirectional bus driver between microcontroller GPIO and distributed LIN-peripheral interfaces. Use Value: Enables microcontroller to read multiple switch states and drive multiple loads using single 8-bit data bus, reducing MCU pin count and firmware complexity. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Interface Adapter |
Use Scenario: Generating precise, synchronized digital stimulus waveforms for IC functional testing and board-level validation. IC Role / Device Role / Timing Role: Serves as a clocked output register, holding pattern data until CLK edge triggers simultaneous update of all eight test pins. Use Value: Delivers sub-10ns timing accuracy and ±24mA drive strength to ensure clean signal edges into capacitive probe loads. | Use Scenario: Bridging modern 3.3V FPGA I/O banks to legacy 5V parallel address/data buses in retrofitted instrumentation systems. IC Role / Device Role / Timing Role: Provides voltage-tolerant, direction-controlled bus transceivers with configurable output enable for read/write arbitration. Use Value: Allows safe 3.3V-to-5V translation without external level shifters, leveraging built-in 6V input tolerance and 5V-compatible output swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT564DWR | TTL-compatible input thresholds (VIH = 2V min), slightly higher ICC (max 80µA vs. 40µA) | Better suited for mixed TTL/CMOS systems requiring guaranteed TTL-level recognition | Select when interfacing with legacy 5V TTL logic families where AC thresholds may not guarantee recognition |
| SN74LVC574APW | Non-inverting outputs, 1.65V–3.6V VCC range, lower drive (±24mA @ 3.3V only) | Optimized for 3.3V-only portable and low-power applications; lacks 5V compatibility | Choose for battery-powered or space-constrained designs where 5V operation and output inversion are unnecessary |
Compared with SN74ACT564DWR and SN74LVC574APW, the SN74AC564DWR uniquely balances 2V–6V operation, inverting 3-state outputs, and 9ns speed-making it the preferred choice for industrial bus isolation and mixed-voltage register buffering where polarity inversion and wide supply range are design requirements.
Availability
SN74AC564DWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment digital pattern generation, and legacy system bus interface adapters requiring stable component supply across extended temperature ranges.
Supply support for SN74AC564DWR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.
The SN74AC564DWR belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial automation, automotive electronics, and test instrumentation.
FAQ
What is the maximum clock frequency supported by the SN74AC564DWR?
The SN74AC564DWR supports a maximum clock frequency of 85MHz at VCC = 5V ± 0.5V, as specified in Section 4.6 of its datasheet. This is derived from minimum pulse width (4ns high/low) and setup/hold time constraints. At 3.3V, the max frequency reduces to 60MHz due to slower switching characteristics. These values assume proper load conditions (CL = 50pF) and ambient temperature of 25°C.
Does the SN74AC564DWR require external pull-up resistors on the OE pin?
Yes - for predictable high-impedance behavior during power-up or power-down, the OE pin of the SN74AC564DWR must be tied to VCC through a pull-up resistor. TI recommends a value determined by the current-sinking capability of the driving source; typical values range from 4.7kΩ to 10kΩ. Leaving OE floating risks undefined output states and potential bus contention.
Can the SN74AC564DWR operate reliably at 3.3V supply voltage?
Yes - the SN74AC564DWR is fully specified for operation at 3.3V (VCC = 3.3V ± 0.3V), with verified timing (min fclock = 60MHz), output drive (±12mA), and logic thresholds (VIH = 2.1V, VIL = 0.9V). Its 2V–6V supply range makes it suitable for both 3.3V and 5V systems without redesign.
What is the function of the inverted outputs in the SN74AC564DWR?
The SN74AC564DWR provides inverted Q outputs (Q1–Q8), meaning each output reflects the logical complement of its corresponding D input after the rising CLK edge. This inversion is inherent to the device architecture and eliminates the need for external inverters in applications requiring active-low signaling, such as enable lines, reset signals, or LED drivers with common-anode configuration.
Is the SN74AC564DWR pin-compatible with other packages of the same part number?
No - the SN74AC564DWR (SOIC-20) shares identical logic functionality and pin numbering with SN74AC564DBR (SSOP-20) and SN74AC564PWR (TSSOP-20), but mechanical dimensions, pitch, and thermal characteristics differ. While electrical pin functions match across packages, PCB footprints are not interchangeable; layout must be adapted for DW (1.27mm pitch), DB (0.65mm pitch), or PW (0.65mm pitch) variants.
SN74AC564DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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-SOIC
SN74AC564DWR FAQ
1.How can I place an order for SN74AC564DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC564DWR 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 SN74AC564DWR reliable?
The price and inventory of SN74AC564DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC564DWR is usually 5 days.
3.What payment methods are accepted for SN74AC564DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC564DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC564DWR?
SN74AC564DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC564DWR 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 SN74AC564DWR?
For technical support, including SN74AC564DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC564DWR requirements.
6.How does Aetrix verify that SN74AC564DWR is sourced from the original manufacturer or authorized distributors?
All SN74AC564DWR 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 SN74AC564DWR meets industry standards.
7.What is the process for return or replacement of SN74AC564DWR?
All SN74AC564DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC564DWR, 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 SN74AC564DWR part is unused and in its original packaging.
Return procedure for SN74AC564DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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