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Texas Instruments SN74AC564DWG4
- Part No.:
- SN74AC564DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC564DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,630
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Product details
Overview
SN74AC564DWG4 from Texas Instruments is an octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus-oriented applications requiring high-speed data latching and bidirectional bus driving. It operates from 2V to 6V VCC, delivers 9ns max propagation delay at 5V, and supports rising-edge clock triggering across all eight channels.
For engineers reviewing the SN74AC564DWG4 datasheet, SN74AC564DWG4 pinout, SN74AC564DWG4 application, or SN74AC564DWG4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, 3-state inverting output architecture, 85MHz max clock frequency at 5V, and compatibility with mixed-voltage I/O systems up to 6V.
Technical Context
The SN74AC564DWG4 implements eight independent D-type flip-flops sharing a common rising-edge-triggered clock (CLK) and active-low output-enable (OE) control. Each channel latches the inverted logic state of its D input on CLK's positive transition, while OE independently places all Q outputs into high-impedance mode without affecting internal storage.
Its flow-through pinout-D inputs on pins 2–9, Q outputs on pins 12–19, CLK on pin 11, OE on pin 1, and power on pins 10 (GND) and 20 (VCC)-minimizes PCB trace crossings and supports compact bus interface layouts. The device meets AC logic performance standards with guaranteed tPLH/tPHL ≤11.5ns and tsu/th ≤2.5ns/2ns at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interfacing with 3.3V and 5V logic families without level shifters |
| Max Clock Frequency | 85MHz at 5V - supports high-throughput data buffering in memory interfaces and I/O expanders |
| Propagation Delay (tpd) | 9ns max at 5V - ensures tight timing margins in synchronous bus architectures |
| Output Drive | ±24mA at 5V - directly drives capacitive bus loads up to 50pF without external buffers |
| Input Voltage Tolerance | Up to 6V - allows safe connection to higher-voltage control signals without clamping diodes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded and automation systems |
| 3-State Enable Polarity | Active-low OE - simplifies bus arbitration logic using standard open-drain or push-pull drivers |
Pinout & Package
SN74AC564DWG4 is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.80mm × 7.50mm), with 1.27mm lead pitch and JEDEC MS-013 compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Global control for placing all eight Q outputs in high-impedance state; does not affect internal latch state |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs latched on CLK rising edge; accept voltages up to 6V regardless of VCC |
| 10 (GND) | Ground reference | Common return path for all internal circuitry and output current sinks |
| 11 (CLK) | Clock input | Rising-edge-triggered global clock for simultaneous latching of all eight D inputs |
| 12–19 (Q8–Q1) | Inverting 3-state outputs | Outputs drive low when D = high (and OE low); high-impedance when OE = high |
| 20 (VCC) | Positive supply | Single power rail supporting 2V–6V operation; requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Minimizes PCB trace length and crosstalk by aligning D inputs (left side) and Q outputs (right side) in sequential order |
| Inverting 3-state outputs | Enables direct connection to shared data buses without external inverters or pull-up resistors |
| Wide VCC range (2–6V) | Supports interoperability between 3.3V microcontrollers and 5V peripheral subsystems in mixed-voltage designs |
| High-speed AC performance | 9ns max tpd and 85MHz fmax at 5V meet timing requirements for legacy parallel bus interfaces (e.g., ISA, PC/104) |
| Bus-friendly drive strength | ±24mA output current at 5V ensures reliable signal integrity on 50pF-loaded backplanes and ribbon-cable interconnects |
Applications
| Industrial I/O Expansion | Legacy Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O capability to PLC controller modules using 20-pin SOIC footprints. IC Role / Device Role / Timing Role: Latches sensor status and actuator commands under microcontroller control; provides isolated 3-state bus access during data transfer. Use Value: Eliminates need for discrete buffer ICs and reduces BOM count while maintaining deterministic 9ns setup/hold timing. |
Use Scenario: Interfacing FPGA-based system controllers to legacy ISA-bus peripherals in test equipment. IC Role / Device Role / Timing Role: Acts as bidirectional data register synchronized to ISA clock; OE controlled by IOR/IOW strobes. Use Value: Enables clean bus turnaround with sub-10ns propagation delay and ±24mA drive into 50pF bus capacitance. |
| Memory-Mapped Peripheral Buffer | Programmable Logic Glue |
Use Scenario: Buffering address/data lines between ARM Cortex-M4 MCU and external SRAM or EPROM in industrial HMI. IC Role / Device Role / Timing Role: Provides registered, inverting data path between processor and memory; CLK driven by ALE or dedicated timing signal. Use Value: Resolves timing skew across 8-bit data paths and supports 85MHz burst transfers without external timing compensation. |
Use Scenario: Replacing discrete TTL logic in CPLD/FPGA configuration circuits where space-constrained SOIC placement is required. IC Role / Device Role / Timing Role: Implements synchronous register banks for control word staging in motor drive sequencers. Use Value: Reduces layout complexity via flow-through pinout and eliminates race conditions with guaranteed 2ns minimum hold time. |
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 |
|---|---|---|---|
| SN74ACT564DW | ACT family: higher drive (±24mA @ 5V same), but stricter 4.5V–5.5V VCC range; identical pinout and function | Requires stable 5V supply; unsuitable for 3.3V-only or mixed-voltage systems | Select when operating exclusively at 5V and needing marginally faster tpd (8ns typ) |
| 74LVC574APW | LVC family: 1.65V–3.6V VCC range, non-inverting outputs, TSSOP-20 package; 3.3V-optimized | Not pin-compatible; requires PCB redesign; lacks 6V-tolerant inputs | Choose for modern 3.3V-only designs prioritizing low static current (<1µA) and smaller footprint |
Compared with SN74ACT564DW and 74LVC574APW, SN74AC564DWG4 uniquely balances wide voltage operation (2–6V), inverting 3-state outputs, and SOIC-20 compatibility-making it the only option for retrofitting legacy 5V systems with 3.3V controller upgrades without layout changes.
Availability
SN74AC564DWG4 is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy bus interface, memory-mapped peripheral buffering, and programmable logic glue applications requiring stable component supply across extended product lifecycles.
Supply support for SN74AC564DWG4 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 industrial, automotive, and communications markets.
The SN74AC564DWG4 belongs to TI's AC logic family-designed for high-speed, low-power, mixed-voltage digital interfacing in industrial control, test equipment, and legacy system upgrades.
FAQ
What is the maximum clock frequency supported by the SN74AC564DWG4?
The SN74AC564DWG4 supports a maximum clock frequency of 85MHz when operated at VCC = 5V ± 0.5V, as specified in Section 4.6 of the official datasheet. At 3.3V, the maximum frequency drops to 60MHz. These values reflect guaranteed performance across the full −40°C to +85°C operating temperature range and are validated using standard load conditions (CL = 50pF).
Does the SN74AC564DWG4 require external pull-up resistors on the OE pin?
Yes-the SN74AC564DWG4 requires a pull-up resistor on the OE pin during power-up and power-down to ensure outputs remain in high-impedance state until firmware initializes control. TI recommends connecting OE to VCC through a resistor sized per the driver's current-sinking capability; typical values range from 4.7kΩ to 10kΩ for standard CMOS drivers.
Is the SN74AC564DWG4 pin-compatible with other members of the '564 family?
Yes-the SN74AC564DWG4 shares identical pinout and function with all SN74AC564 variants (e.g., DB, N, PW packages) and is also pin-compatible with SN74ACT564DW and SN74ALS564N. However, voltage ranges and AC timing differ: ACT requires 4.5–5.5V, ALS is TTL-compatible (4.75–5.25V), while AC supports 2–6V.
What is the meaning of "G4" in the SN74AC564DWG4 part number?
The "G4" suffix in SN74AC564DWG4 denotes TI's green packaging standard: lead-free (Pb-free), RoHS-compliant construction with NiPdAu lead finish and Level-1 moisture sensitivity rating (MSL-1, unlimited floor life at <30°C/60% RH). It does not indicate functional or electrical differences from SN74AC564DW.
Can the SN74AC564DWG4 safely interface with 3.3V microcontrollers while powered from 5V?
Yes-the SN74AC564DWG4 accepts input voltages up to 6V regardless of VCC, so its D and CLK inputs can be driven directly by 3.3V logic levels even when VCC = 5V. Its outputs swing rail-to-rail (0V to 5V), requiring level translation if connected to 3.3V-only receivers; OE may be driven from either voltage domain.
SN74AC564DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
SN74AC564DWG4 FAQ
1.How can I place an order for SN74AC564DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC564DWG4 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 SN74AC564DWG4 reliable?
The price and inventory of SN74AC564DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC564DWG4 is usually 5 days.
3.What payment methods are accepted for SN74AC564DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC564DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC564DWG4?
SN74AC564DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC564DWG4 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 SN74AC564DWG4?
For technical support, including SN74AC564DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC564DWG4 requirements.
6.How does Aetrix verify that SN74AC564DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74AC564DWG4 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 SN74AC564DWG4 meets industry standards.
7.What is the process for return or replacement of SN74AC564DWG4?
All SN74AC564DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC564DWG4, 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 SN74AC564DWG4 part is unused and in its original packaging.
Return procedure for SN74AC564DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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