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Texas Instruments SN74ALS564BDW
- Part No.:
- SN74ALS564BDW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS564BDW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
SN74ALS564BDW from Texas Instruments is an octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus driving in TTL-compatible digital systems. It operates at up to 30 MHz clock frequency, supports 0°C to 70°C industrial temperature range, and features bus-structured pinout with buffered OE and CLK inputs - enabling direct interface with data buses in I/O port and register applications.
For engineers reviewing the SN74ALS564BDW datasheet, SN74ALS564BDW pinout, SN74ALS564BDW application, or SN74ALS564BDW equivalent, this device is evaluated for high-speed bus buffering, synchronous data latching, low-power 3-state control timing, and legacy TTL system compatibility where inverting output logic and precise setup/hold timing are required.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the low-to-high transition of CLK. Internal storage is unaffected by OE state, allowing data retention or update while outputs remain in high-impedance mode.
It uses ALS (Advanced Low-Power Schottky) TTL technology, delivering 24 mA sink current per output, 2.4 V minimum VOH at 5 V supply, and guaranteed 15 ns setup time with 4 ns hold time - optimized for noise-immune, high-drive bus interfacing in mixed-logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS TTL - ensures compatibility with 74LS/74AS systems and higher noise margin than standard TTL |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments without derating |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data capture in legacy backplane and control bus designs |
| Output Drive | 24 mA sink / –2.6 mA source - sufficient to drive multiple TTL loads or terminated transmission lines directly |
| Setup/Hold Time | 15 ns setup / 4 ns hold - defines minimum data stability window before and after CLK rising edge for reliable sampling |
| 3-State Enable Delay | tPHZ = 1 ns min / tPLZ = 2 ns min - enables fast bus arbitration and dynamic output control in multiplexed systems |
| Supply Voltage Range | 4.5 V to 5.5 V - accommodates nominal 5 V rails with ±10% tolerance, including aging and ripple margins |
Pinout & Package
SN74ALS564BDW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and 2.65 mm max height - compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; does not affect internal flip-flop operation - allows concurrent data loading and bus release |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops - sampled synchronously on CLK rising edge |
| 10 | GND | Power ground reference for all logic and output stages |
| 11–18 | 1Q–8Q | Inverting 3-state outputs - Q = NOT D when enabled; high-Z when OE = HIGH |
| 19 | CLK | Clock input - triggers all eight flip-flops simultaneously on rising edge |
| 20 | VCC | +5 V supply - powers internal logic and output drivers; requires local decoupling per ALS TTL guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Input/output pairing (D1/Q1, D2/Q2, etc.) minimizes trace crossing and simplifies PCB layout for parallel data paths |
| Inverting 3-state outputs | Eliminates need for external inverters in complemented bus architectures; enables direct connection to bidirectional data buses |
| Buffered control inputs | OE and CLK inputs include Schottky-clamped buffers - reduce sensitivity to noise and improve fan-out capability |
| Independent OE control | Allows outputs to enter high-Z without disrupting internal state - critical for hot-swap or multi-master bus arbitration |
| ALS TTL performance | Combines LS-level power (24 mW typical ICC) with AS-level speed (30 MHz), bridging legacy and upgraded systems |
Applications
| Industrial Control Backplanes | Legacy Computer I/O Expansion |
|---|---|
Use Scenario: Isolating and latching status signals from multiple PLC modules onto a shared 8-bit data bus. IC Role / Device Role / Timing Role: Synchronous data register with 3-state bus isolation - captures sensor readings on CLK edge and releases bus when not selected. Use Value: Enables deterministic timing via 15 ns setup/4 ns hold window and eliminates contention using fast 1–2 ns enable/disable transitions. |
Use Scenario: Expanding ISA-style peripheral slots with additional parallel I/O ports in retro-computing hardware. IC Role / Device Role / Timing Role: Octal latch and bus driver - holds CPU write data until strobe and presents it to peripherals with inverted logic polarity. Use Value: Inverting outputs match legacy peripheral input expectations; 24 mA drive sustains signal integrity across long backplane traces. |
| Test Equipment Data Acquisition | Automated Test Fixture Interfaces |
Use Scenario: Capturing parallel digital test vectors from pattern generators into synchronized acquisition channels. IC Role / Device Role / Timing Role: Edge-triggered sampling register - aligns asynchronous stimulus data to system clock domain before digitization. Use Value: Guaranteed 30 MHz operation ensures sub-33 ns sampling resolution; ALS process provides stable timing across temperature. |
Use Scenario: Controlling 8-channel relay banks or LED indicators from microcontroller GPIO with minimal external components. IC Role / Device Role / Timing Role: Output expander with 3-state capability - allows shared bus control of multiple fixtures without hardware demultiplexing. Use Value: Bus-structured pinout reduces routing complexity; OE-controlled high-Z prevents back-driving during reconfiguration. |
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 |
|---|---|---|---|
| SN74ALS574BN | Non-inverting 3-state outputs; identical timing, drive, and pinout except Q = D (not inverted) | Used where bus logic polarity must preserve input signal level rather than invert it | Select when system-level signal flow requires non-inverted latched data - no PCB change needed if pin-compatible layout is used |
| SN74F574N | Fast TTL family; higher ICC (45 mA), faster propagation (tPLH/tPHL ≈ 8 ns), but lower noise margin and no ALS power efficiency | Suitable for speed-critical paths where power dissipation is secondary to timing closure | Choose for maximum clock rate in noise-controlled environments; verify VIL/VIH compatibility with driving sources |
Compared with SN74ALS564BDW, SN74ALS574BN offers identical timing and packaging but non-inverting outputs - ideal for polarity-sensitive bus interfaces - while SN74F574N trades ALS power efficiency for raw speed, requiring tighter supply regulation and thermal management.
Availability
SN74ALS564BDW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computer I/O expansion, test equipment data acquisition, and automated test fixture interfaces requiring stable component supply and long-term obsolescence support.
Supply support for SN74ALS564BDW 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 with over 90 years of analog and logic innovation, serving automotive, industrial, and communications markets with high-reliability, long-lifecycle components.
The SN74ALS564BDW belongs to TI's legacy ALS TTL logic family - engineered for robustness in industrial control and military-grade systems where predictable timing, noise immunity, and backward compatibility with 74-series infrastructure are essential.
FAQ
What is the operating voltage range for SN74ALS564BDW?
The SN74ALS564BDW operates from 4.5 V to 5.5 V DC. This range ensures compatibility with standard 5 V TTL power rails while accommodating typical supply tolerances, ripple, and aging effects. Operation outside this range may cause unreliable switching or permanent damage, as specified in the absolute maximum ratings (7 V max).
Does SN74ALS564BDW support hot-swapping or dynamic bus sharing?
Yes, SN74ALS564BDW supports dynamic bus sharing through its independent OE control: outputs enter high-impedance state without affecting internal flip-flop state, allowing new data to be loaded or retained while the bus is released. This enables safe hot-swapping in multi-master systems when coordinated with system-level arbitration logic.
What is the function of the inverting outputs in SN74ALS564BDW?
The SN74ALS564BDW provides inverting 3-state outputs (Q = NOT D), eliminating the need for external inverters in systems where bus logic expects complemented data - such as certain memory-mapped I/O protocols or differential bus drivers. This reduces component count and improves timing predictability by removing external gate delays.
How does SN74ALS564BDW differ from SN74ALS574BDW?
SN74ALS564BDW and SN74ALS574BDW share identical pinout, timing, drive strength, and package, but differ in output polarity: SN74ALS564BDW has inverting outputs (Q = NOT D), while SN74ALS574BDW has non-inverting outputs (Q = D). This functional difference determines compatibility with downstream logic polarity requirements.
Is SN74ALS564BDW RoHS compliant?
Yes, SN74ALS564BDW is RoHS compliant, with lead finish NIPDAU (nickel/palladium/gold) and moisture sensitivity level (MSL) rating Level-1-260°C-UNLIM. It meets JEDEC J-STD-020 standards for surface-mount reflow and is approved for lead-free assembly processes without exemption.
SN74ALS564BDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 14ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 18 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ALS564BDW FAQ
1.How can I place an order for SN74ALS564BDW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS564BDW 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 SN74ALS564BDW reliable?
The price and inventory of SN74ALS564BDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS564BDW is usually 5 days.
3.What payment methods are accepted for SN74ALS564BDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS564BDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS564BDW?
SN74ALS564BDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS564BDW 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 SN74ALS564BDW?
For technical support, including SN74ALS564BDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS564BDW requirements.
6.How does Aetrix verify that SN74ALS564BDW is sourced from the original manufacturer or authorized distributors?
All SN74ALS564BDW 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 SN74ALS564BDW meets industry standards.
7.What is the process for return or replacement of SN74ALS564BDW?
All SN74ALS564BDW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS564BDW, 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 SN74ALS564BDW part is unused and in its original packaging.
Return procedure for SN74ALS564BDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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