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Texas Instruments SN74AC564DBLE
- Part No.:
- SN74AC564DBLE
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AC564DBLE.pdf
- Description:
- BUS DRIVER, AC SERIES, 8-BIT
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SN74AC564DBLE 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 propagation delay at 5V, and supports rising-edge clock triggering across all eight channels. It is used in bidirectional bus drivers and I/O port buffering in industrial control and data acquisition systems.
For engineers reviewing the SN74AC564DBLE datasheet, SN74AC564DBLE pinout, SN74AC564DBLE application, or SN74AC564DBLE equivalent, key selection criteria include its 20-pin SSOP (DB) package, inverting 3-state output architecture, 5.5V absolute max input voltage tolerance, and compatibility with mixed-voltage logic systems requiring level-shifting capability.
Technical Context
The SN74AC564DBLE 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, and OE on pin 1-minimizes PCB trace crossing and supports compact bus routing. The device meets AC specifications across −40°C to +85°C, with tPLH/tPHL ≤11.5ns and fMAX = 95MHz at VCC = 5V ±0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables direct interfacing with 3.3V and 5V logic domains without level shifters |
| Max Propagation Delay | 9ns at 5V - ensures tight timing margins in high-speed synchronous bus interfaces |
| Output Drive | ±24mA at 5.5V - drives capacitive loads up to 50pF directly, eliminating external buffers |
| Input Voltage Tolerance | Up to VCC + 0.5V - allows safe connection to higher-voltage signals without clamping diodes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| 3-State Enable Logic | Active-low OE - simplifies bus arbitration by enabling shared data lines with pull-up/pull-down independence |
| Input Capacitance | 4.5pF - minimizes loading on upstream drivers and preserves signal integrity in fan-out scenarios |
Pinout & Package
SN74AC564DBLE is housed in a 20-pin SSOP (Shrink Small Outline Package), designated DB, with body dimensions of 7.2mm × 5.30mm and overall package size of 7.2mm × 7.8mm. It features a 0.65mm lead pitch and 2.0mm maximum height per JEDEC MO-150.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OE (Pin 1) | Global output enable | Active-low control that places all eight Q outputs in high-impedance state without altering internal flip-flop states |
| D1–D8 (Pins 2–9) | Data inputs | Asynchronous inputs latched on CLK rising edge; each drives corresponding inverted Q output |
| GND (Pin 10) | Power reference | Common return path for all logic and output current; must be low-inductance for noise immunity |
| CLK (Pin 11) | Clock input | Rising-edge-triggered global clock synchronizing all eight flip-flops; accepts 5V-tolerant inputs |
| Q8–Q1 (Pins 12–19) | Inverting outputs | Complementary to D inputs after clock edge; 3-state capable with fast tPZH/tPLZ ≤9.5ns |
| VCC (Pin 20) | Supply rail | Single positive supply supporting 2V–6V operation; requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input-to-output signal path alignment minimizes layer transitions and reduces crosstalk in dense PCB layouts |
| Inverting 3-state outputs | Eliminates need for external inverters in bus-driver configurations while enabling bidirectional data flow control |
| Full parallel access | All eight D inputs accept new data simultaneously, supporting synchronized register loading in one clock cycle |
| 5.5V-tolerant inputs | Accepts logic-high signals up to 5.5V regardless of VCC, enabling interoperability with legacy 5V peripherals |
| Low dynamic power | Typical Cpd = 50pF at 1MHz - reduces switching current and heat generation in high-frequency operation |
Applications
| Industrial PLC I/O Modules | Test Equipment Digital Pattern Generators |
|---|---|
Use Scenario: Isolating and latching sensor status signals before transmission over backplane buses in programmable logic controllers. IC Role / Device Role / Timing Role: Octal register buffering digital inputs with synchronized sampling and 3-state bus isolation during data read cycles. Use Value: Enables deterministic sampling of 8-bit status words at up to 95MHz, reducing jitter-induced metastability in real-time control loops. | Use Scenario: Generating precise, synchronized stimulus waveforms for IC functional testing using pattern memory and clock-controlled output staging. IC Role / Device Role / Timing Role: Edge-triggered storage element holding test vector bits and driving them onto DUT interface lines with controlled timing skew. Use Value: Delivers sub-10ns propagation consistency across all eight outputs, ensuring tight setup/hold compliance for high-speed digital test fixtures. |
| Communications Backplane Interface | Embedded Data Acquisition Front-Ends |
Use Scenario: Buffering and isolating control/status registers between processor and multi-drop serial communication transceivers on telecom backplanes. IC Role / Device Role / Timing Role: Bidirectional bus driver implementing register-based command handshaking with OE-controlled direction switching. Use Value: Supports hot-swap-safe bus arbitration via fast 3-state enable/disable (tPZH ≤9ns), preventing bus contention during module insertion/removal. | Use Scenario: Capturing parallel ADC output words and holding them stable for microcontroller readback in multi-channel analog front-ends. IC Role / Device Role / Timing Role: Synchronized latch capturing 8-bit conversion results on system clock edge, decoupling ADC timing from CPU access latency. Use Value: Guarantees valid hold time >2ns post-clock edge, eliminating read errors caused by asynchronous ADC data valid windows. |
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 |
|---|---|---|---|
| SN74ACT564DBR | TTL-compatible input thresholds (VIH = 2V min), slightly higher drive (±24mA @ 5V) but identical pinout and AC specs | Better noise margin in noisy industrial environments; same timing and layout compatibility | Select when interfacing with legacy TTL logic or requiring tighter VIH/VIL margins under EMI stress |
| 74LVC574APW,118 | Non-inverting outputs, 3.3V-only VCC range (1.65–3.6V), lower power (Cpd = 25pF), TSSOP-20 package | Optimized for low-voltage portable systems; lacks 5V tolerance and inverting function | Choose for battery-powered designs where inversion is unnecessary and 3.3V operation suffices |
Compared with SN74ACT564DBR and 74LVC574APW,118, the SN74AC564DBLE uniquely combines 2V–6V operation, inverting 3-state outputs, and 5.5V-tolerant inputs-making it the only option for mixed-voltage bus isolation where polarity inversion and wide supply flexibility are mandatory.
Availability
SN74AC564DBLE is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment, communications backplane interfaces, and embedded data acquisition front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AC564DBLE 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74AC564DBLE belongs to TI's AC logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in noise-sensitive industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by the SN74AC564DBLE?
The SN74AC564DBLE supports a maximum clock frequency of 95MHz at VCC = 5V ±0.5V and 75MHz at VCC = 3.3V ±0.3V, as specified in Sections 4.5 and 4.6 of the official datasheet. These values reflect guaranteed operation across the full −40°C to +85°C temperature range with proper load conditions (CL = 50pF).
Does the SN74AC564DBLE require external pull-up resistors on the OE pin?
Yes - for reliable high-impedance state behavior during power-up or power-down sequences, the OE pin of the SN74AC564DBLE must be tied to VCC through an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the controlling driver, as detailed in Section 6.1 of the datasheet.
Can the SN74AC564DBLE interface directly with 5V logic while operating at 3.3V VCC?
Yes - the SN74AC564DBLE accepts input voltages up to VCC + 0.5V, meaning it tolerates 5V signals even when powered at 3.3V. This eliminates level-shifter requirements when connecting to legacy 5V peripherals, as confirmed in Section 4.1 Absolute Maximum Ratings and Section 4.2 Recommended Operating Conditions.
What is the purpose of the flow-through architecture in the SN74AC564DBLE?
The flow-through architecture in the SN74AC564DBLE arranges D inputs (pins 2–9) and Q outputs (pins 12–19) on opposite sides of the 20-pin SSOP package to minimize trace crossing and layer changes on PCBs. This layout reduces parasitic inductance/capacitance, improves signal integrity, and simplifies high-density bus routing - as explicitly described in the "Features" section of the datasheet.
Is the SN74AC564DBLE RoHS compliant and lead-free?
Yes - the SN74AC564DBLE is RoHS compliant and features a NIPDAU (nickel-palladium-gold) lead finish, as documented in the PACKAGE OPTION ADDENDUM. Its MSL rating is Level-1-260°C-UNLIM, confirming suitability for standard Pb-free reflow processes without moisture sensitivity concerns.
SN74AC564DBLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm 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:
- 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-SSOP
SN74AC564DBLE FAQ
1.How can I place an order for SN74AC564DBLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC564DBLE 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 SN74AC564DBLE reliable?
The price and inventory of SN74AC564DBLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC564DBLE is usually 5 days.
3.What payment methods are accepted for SN74AC564DBLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC564DBLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC564DBLE?
SN74AC564DBLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC564DBLE 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 SN74AC564DBLE?
For technical support, including SN74AC564DBLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC564DBLE requirements.
6.How does Aetrix verify that SN74AC564DBLE is sourced from the original manufacturer or authorized distributors?
All SN74AC564DBLE 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 SN74AC564DBLE meets industry standards.
7.What is the process for return or replacement of SN74AC564DBLE?
All SN74AC564DBLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC564DBLE, 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 SN74AC564DBLE part is unused and in its original packaging.
Return procedure for SN74AC564DBLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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