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Texas Instruments SN74ALS564BDWR
- Part No.:
- SN74ALS564BDWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS564BDWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,437
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Product details
Overview
SN74ALS564BDWR 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 0°C to 70°C, supports up to 30 MHz clock frequency, delivers ±24 mA output drive, and features bus-structured pinout for direct PCB bus interfacing in I/O port and register applications.
For engineers reviewing the SN74ALS564BDWR datasheet, SN74ALS564BDWR pinout, SN74ALS564BDWR application, or SN74ALS564BDWR equivalent, key selection criteria include its 20-pin SOIC-DW package, inverting 3-state output architecture, guaranteed 15 ns data setup time, and compatibility with legacy ALS logic voltage thresholds (VIH = 2.0 V, VIL = 0.8 V).
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high CLK transition, with asynchronous 3-state control via OE. Internal flip-flop operation remains fully functional regardless of OE state - enabling data retention or new sampling while outputs are high-impedance.
The inverting output stage drives bus lines directly without external pull-ups, and buffered OE/CLK inputs reduce loading on upstream logic. Its ALS family characteristics ensure compatibility with 74LS and 74F logic levels while delivering improved speed-power trade-offs over standard TTL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible input thresholds and reduced power vs. standard TTL. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Max Clock Frequency | 30 MHz - enables high-speed register transfer in legacy bus architectures like ISA or custom parallel interfaces. |
| Output Drive | 24 mA sink / –2.6 mA source - sufficient to drive multiple TTL loads or terminate unterminated buses. |
| Setup/Hold Times | tsu = 15 ns, th = 0 ns - simplifies timing closure with minimal external delay margin required before CLK↑. |
| 3-State Enable Delay | tPHZ = 1 ns, tPLZ = 2 ns - allows rapid bus arbitration and fast output disable/enable transitions. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated +5 V rails and tolerant of typical line regulation variation. |
Pinout & Package
SN74ALS564BDWR is housed in a 20-pin SOIC (DW) package measuring 12.83 mm × 7.5 mm × 2.65 mm max height, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; does not affect internal latch state - enables concurrent data update and bus release. |
| 2–9 | 1D–8D | Asynchronous data inputs to each of eight D flip-flops; TTL-compatible VIH/VIL thresholds. |
| 10 | GND | Ground reference for all logic and output stages; requires low-impedance PCB plane connection. |
| 11–18 | 1Q–8Q | Inverting 3-state outputs; high-impedance when OE = HIGH, logic LOW when enabled and D = HIGH. |
| 19 | CLK | Common clock input; edge-triggered on rising transition; internally buffered to reduce skew and fanout loading. |
| 20 | VCC | +5 V supply; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Eliminates need for external inverters in bus-driver configurations and reduces component count in bidirectional data paths. |
| Bus-structured pinout | Groups inputs (2–9) and outputs (11–18) contiguously to minimize trace crossovers and simplify PCB layout for parallel data buses. |
| Buffered control inputs | Reduces capacitive loading on CLK and OE nets, enabling reliable fanout to multiple devices without signal degradation. |
| Independent OE functionality | Allows real-time bus arbitration: outputs enter high-Z without resetting internal latch states, preserving data integrity during contention. |
| ALS logic family performance | Delivers 30 MHz operation with 15 mW average power per flip-flop - optimal for power-constrained legacy system upgrades. |
Applications
| Industrial PLC I/O Modules | Legacy Computer Bus Interfaces |
|---|---|
Use Scenario: Isolating and latching sensor/actuator signals in modular rack-mounted PLC backplanes with shared data/address buses. IC Role / Device Role / Timing Role: Acts as an octal input register with 3-state outputs, capturing parallel field data on CLK↑ and releasing bus control via OE during CPU read cycles. Use Value: Enables deterministic timing with 15 ns setup margin and eliminates bus contention through precise OE-controlled high-Z transitions. | Use Scenario: Interfacing microprocessor address/data buses (e.g., Z80, 8086) to peripheral controllers requiring synchronized latch and tri-state capability. IC Role / Device Role / Timing Role: Serves as a bidirectional bus transceiver register - latching outgoing data on CLK↑ and presenting it to peripherals while isolating CPU during read operations. Use Value: Provides inverting 3-state outputs that match legacy bus electrical requirements without external level-shifting or inversion logic. |
| Test Equipment Digital Pattern Generators | Avionics Data Acquisition Units |
Use Scenario: Generating synchronized multi-bit stimulus patterns for IC functional testing where precise edge-aligned data hold is critical. IC Role / Device Role / Timing Role: Functions as a clocked output register, holding pattern bits stable for test cycle duration and releasing bus only during reprogramming windows. Use Value: Guarantees 0 ns hold time requirement, eliminating need for external delay elements to meet tester timing constraints. | Use Scenario: Capturing discrete avionics sensor status (e.g., flap position, landing gear switches) into a centralized monitoring unit with MIL-STD-1553 or ARINC-429 interface bridging. IC Role / Device Role / Timing Role: Acts as a fault-tolerant input latch, retaining last-known valid state during transient OE assertion caused by bus arbitration or watchdog resets. Use Value: Maintains data coherency across power-up/reset sequences due to OE-independent internal latch persistence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS273N | Non-inverting outputs, no 3-state control - requires external tristate buffers for bus use. | Limited to unidirectional register applications; unsuitable for shared-bus arbitration without added components. | Select only if bus isolation is handled externally and inverting logic is undesirable. |
| SN74F574N | F-family: higher speed (50 MHz), higher power (22 mW/flip-flop), non-inverting outputs, 3-state enabled. | Better suited for high-frequency designs but incompatible with ALS-level noise margins and VIH/VIL thresholds. | Choose when clock rate exceeds 30 MHz and system tolerates increased power and reduced noise immunity. |
Compared with SN74ALS273N and SN74F574N, SN74ALS564BDWR uniquely combines inverting 3-state outputs, ALS-level power efficiency, and bus-optimized pinout - making it the only drop-in solution for legacy bus-driving register functions requiring both polarity inversion and dynamic bus release.
Availability
SN74ALS564BDWR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy computer bus interfaces, test equipment digital pattern generators, and avionics data acquisition units requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS564BDWR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS564BDWR belongs to TI's legacy ALS logic family, engineered specifically for high-reliability, low-power bus interface and register applications in commercial-temperature embedded systems.
FAQ
What is the maximum clock frequency supported by SN74ALS564BDWR?
The SN74ALS564BDWR supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C, CL = 50 pF). This specification is verified per the SDAS164B datasheet switching characteristics table and applies specifically to the SN74ALS564BDWR variant in SOIC-DW packaging. Exceeding 30 MHz may result in setup/hold violations or metastability.
Does SN74ALS564BDWR have non-inverting or inverting outputs?
SN74ALS564BDWR has inverting 3-state outputs: when enabled (OE = LOW), Qn = NOT(Dn). This is confirmed in the function table and logic diagram of the SDAS164B datasheet. The inverting behavior is intrinsic to the device's design and cannot be disabled or configured - it must be accounted for in system-level logic synthesis and timing analysis for SN74ALS564BDWR implementations.
What is the purpose of the OE pin on SN74ALS564BDWR?
The OE (Output Enable) pin on SN74ALS564BDWR is an active-low control that places all eight outputs in high-impedance state without affecting internal flip-flop states. As stated in the datasheet, "OE input does not affect internal operations" - meaning data can be latched or retained independently of bus release. This enables SN74ALS564BDWR to serve as a buffer register where data integrity is preserved during bus contention or multiplexing.
Is SN74ALS564BDWR RoHS compliant?
Yes, SN74ALS564BDWR is RoHS compliant. According to TI's Package Option Addendum, the SN74ALS564BDW and SN74ALS564BDW.A variants feature NIPDAU (Nickel/Palladium/Gold) lead finish and are marked "Yes" under RoHS. This compliance applies to the SOIC-DW package used in SN74ALS564BDWR and is verified per JEDEC J-STD-609 standards.
What are the absolute maximum ratings for SN74ALS564BDWR?
The absolute maximum ratings for SN74ALS564BDWR are: supply voltage (VCC) ≤ 7 V; input voltage (VI) ≤ 7 V; voltage applied to disabled 3-state outputs ≤ 5.5 V; operating free-air temperature range = 0°C to 70°C; storage temperature = –65°C to 150°C. These limits are defined in the SDAS164B datasheet and must not be exceeded to prevent permanent damage to SN74ALS564BDWR - even momentarily.
SN74ALS564BDWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- 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:
- 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
SN74ALS564BDWR FAQ
1.How can I place an order for SN74ALS564BDWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS564BDWR 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 SN74ALS564BDWR reliable?
The price and inventory of SN74ALS564BDWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS564BDWR is usually 5 days.
3.What payment methods are accepted for SN74ALS564BDWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS564BDWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS564BDWR?
SN74ALS564BDWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS564BDWR 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 SN74ALS564BDWR?
For technical support, including SN74ALS564BDWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS564BDWR requirements.
6.How does Aetrix verify that SN74ALS564BDWR is sourced from the original manufacturer or authorized distributors?
All SN74ALS564BDWR 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 SN74ALS564BDWR meets industry standards.
7.What is the process for return or replacement of SN74ALS564BDWR?
All SN74ALS564BDWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS564BDWR, 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 SN74ALS564BDWR part is unused and in its original packaging.
Return procedure for SN74ALS564BDWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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