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Texas Instruments SN74ALS564BNSR
- Part No.:
- SN74ALS564BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS564BNSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,934
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Product details
Overview
SN74ALS564BNSR 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 4.5–5.5 V, supports up to 30 MHz clock frequency, features 20-pin SOP (NS) package, and delivers ±24 mA output drive capability for bidirectional bus interfacing in industrial control and legacy computing applications.
For engineers reviewing the SN74ALS564BNSR datasheet, SN74ALS564BNSR pinout, SN74ALS564BNSR application, or SN74ALS564BNSR equivalent, this page provides verified functional specifications, bus-structured pin mapping, temperature-rated performance data, and direct alternatives for legacy system redesign and component obsolescence mitigation.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, with asynchronous 3-state output enable (OE) that isolates outputs without affecting internal state retention. Each channel features buffered OE and CLK inputs to reduce loading and improve noise immunity in high-density bus environments.
The inverting output architecture allows direct connection to shared data buses without external inversion logic. Internal logic ensures setup time (15 ns) and hold time (0 ns) compliance across 0°C to 70°C, while propagation delays (tPLH/tPHL ≤14 ns) support synchronous timing in 30 MHz systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) TTL - enables interoperability with 74LS/74AS families and lower power than standard TTL. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard +5 V rail; no external regulation required in legacy 5 V systems. |
| Max Clock Frequency | 30 MHz - supports high-speed data latching in real-time I/O ports and buffer registers. |
| Output Drive | 24 mA sink / –2.6 mA source - sufficient to drive 10 LS-TTL loads or terminate stubbed bus lines directly. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control equipment. |
| 3-State Enable Delay | tPHZ ≤10 ns, tPLZ ≤15 ns - fast bus turnaround enables efficient time-multiplexed bidirectional communication. |
| Package | SOP-20 (NS) - surface-mount, RoHS-compliant, tape-and-reel (2000 pcs), MSL Level-1, 24.4 mm reel width. |
Pinout & Package
SN74ALS564BNSR uses a 20-pin Small Outline Package (SOP-20, drawing NS), 7.6 mm × 13.0 mm body, 1.27 mm pitch, 2.65 mm max height, with pin 1 located in quadrant Q1 per JEDEC standard tape orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low global 3-state control; does not affect internal flip-flop state during assertion. |
| 2–9 | 1D–8D | Data inputs for each of eight D-type flip-flops; sampled on rising CLK edge. |
| 10 | GND | Ground reference for all logic and output stages; must be low-impedance for stable bus driving. |
| 11–18 | 1Q–8Q | Inverting 3-state outputs; high-impedance when OE = HIGH, logic LOW when D = HIGH and enabled. |
| 19 | CLK | Common clock input; edge-triggered on low-to-high transition; internally buffered. |
| 20 | VCC | +5 V supply; decoupling capacitor (0.1 µF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Input/output pairs aligned (e.g., 1D/1Q adjacent) to minimize trace length and crosstalk on PCBs. |
| Inverting 3-state outputs | Eliminates need for external inverters when interfacing with non-inverting bus transceivers or memory data paths. |
| Buffered control inputs | OE and CLK inputs have enhanced fan-out (≥20) and reduced capacitive loading for reliable multi-device synchronization. |
| Retentive 3-state operation | Internal flip-flop state remains unchanged during OE assertion - enables glitch-free bus arbitration and hot-swap readiness. |
| ALS logic family performance | Combines 30 MHz speed with 16 mA typical ICC (outputs disabled), reducing thermal load vs. standard TTL in dense logic arrays. |
Applications
| Industrial PLC I/O Modules | Legacy Computer Bus Interfaces |
|---|---|
|
Use Scenario: Isolating and latching sensor/actuator signals in modular programmable logic controllers with shared backplane data buses. IC Role / Device Role / Timing Role: Octal register buffering digital inputs/outputs with synchronized sampling and bus contention control via OE. Use Value: Enables deterministic scan-cycle timing with 15 ns setup margin and 30 MHz update rate, supporting sub-millisecond I/O response. |
Use Scenario: Interfacing microprocessor address/data buses to peripheral cards in ISA or proprietary 8-bit computer architectures. IC Role / Device Role / Timing Role: Bidirectional bus driver and latch for data port expansion, using inverting outputs to match legacy bus polarity conventions. Use Value: Direct drive of 10 LS-TTL loads eliminates external buffers, reducing BOM count and board area in space-constrained retro-computing designs. |
| Test Equipment Digital Pattern Generators | Avionics Data Acquisition Systems |
|
Use Scenario: Generating synchronized parallel stimulus patterns for IC functional testing where precise edge-aligned data capture is required. IC Role / Device Role / Timing Role: Edge-triggered data register holding test vectors; OE used for dynamic bus release between pattern phases. Use Value: 10 ns max enable/disable delay ensures clean bus transitions between test sequences, preventing metastability in downstream comparators. |
Use Scenario: Capturing discrete status signals (e.g., switch closures, relay states) in airborne avionics subsystems with MIL-STD-883 compliant timing margins. IC Role / Device Role / Timing Role: Input latch for safety-critical discrete monitoring; retains last valid state during transient OE assertion for fault-tolerant logging. Use Value: Retentive 3-state behavior maintains known signal integrity during bus reconfiguration, satisfying DO-254 deterministic timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type bus interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS273N | Non-inverting outputs, single OE per group of 4, no 3-state disable on individual outputs. | Lacks per-channel bus isolation; requires additional logic for bidirectional use. | Select when fixed-polarity latching suffices and board layout favors grouped enable control. |
| SN74ACT574PW | CMOS ACT family, 5 V tolerant, 24 mA drive, but non-inverting and higher VIH (2 V min). | Requires level-shifting for legacy TTL input compatibility; faster (100+ MHz) but over-specified for 30 MHz bus use. | Choose only if upgrading to CMOS logic family and redesigning surrounding circuitry for voltage compatibility. |
Compared with SN74ALS564BNSR, SN74ALS273N offers simpler control but lacks true 3-state flexibility, while SN74ACT574PW provides higher speed and lower power but introduces voltage-level mismatch risks in mixed-logic systems - SN74ALS564BNSR remains optimal for drop-in replacement in existing ALS/TTL bus architectures.
Availability
SN74ALS564BNSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy computer bus interfaces, and test equipment digital pattern generators requiring stable component supply and long-term lifecycle support.
Supply support for SN74ALS564BNSR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74ALS564BNSR belongs to TI's legacy ALS logic product line, engineered specifically for high-reliability, medium-speed bus interfacing in commercial-temperature industrial and computing systems.
FAQ
What is the maximum clock frequency supported by SN74ALS564BNSR?
The SN74ALS564BNSR supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C). This value is specified in the switching characteristics table of the SDAS164B datasheet and validated across process corners and voltage extremes. The SN74ALS564BNSR achieves this timing with tPLH/tPHL ≤14 ns and tw ≥14 ns minimum pulse width.
Does SN74ALS564BNSR support true bidirectional bus operation?
Yes, the SN74ALS564BNSR supports bidirectional bus operation through its active-low 3-state output enable (OE) pin. When OE is HIGH, all eight outputs enter high-impedance state, allowing other devices to drive the same bus lines. Its inverting outputs align with common bus polarity conventions, and the retentive behavior ensures internal state remains intact during bus release - a key requirement for SN74ALS564BNSR in bidirectional I/O port designs.
What package type and dimensions does SN74ALS564BNSR use?
The SN74ALS564BNSR uses a 20-pin SOP (Small Outline Package) with drawing code NS, measuring 13.0 mm × 7.6 mm × 2.65 mm max height and 1.27 mm lead pitch. It is supplied in tape-and-reel format (2000 units per reel), MSL Level-1 rated, and RoHS-compliant with NiPdAu lead finish. Pin 1 orientation follows quadrant Q1 per JEDEC tape standard.
How does SN74ALS564BNSR differ from SN74ALS564BN?
The SN74ALS564BNSR and SN74ALS564BN share identical electrical specifications, logic function, and pinout, differing only in packaging: SN74ALS564BNSR uses SOP-20 (NS), while SN74ALS564BN uses PDIP-20 (N). Both operate from 0°C to 70°C and meet the same ALS family timing and drive parameters. The SN74ALS564BNSR is optimized for automated SMT assembly, whereas SN74ALS564BN suits through-hole prototyping or legacy repair.
Is SN74ALS564BNSR pin-compatible with other octal D-type flip-flops like SN74ALS374?
No, SN74ALS564BNSR is not pin-compatible with SN74ALS374. While both are octal D-type flip-flops with 3-state outputs, SN74ALS564BNSR has inverting outputs and a bus-structured pinout (D and Q pins interleaved per channel), whereas SN74ALS374 features non-inverting outputs and separate input/output banks. Their pin mappings differ fundamentally - SN74ALS564BNSR pin 1 is OE, while SN74ALS374 pin 1 is GND - making direct substitution impossible without PCB revision.
SN74ALS564BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
SN74ALS564BNSR FAQ
1.How can I place an order for SN74ALS564BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS564BNSR 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 SN74ALS564BNSR reliable?
The price and inventory of SN74ALS564BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS564BNSR is usually 5 days.
3.What payment methods are accepted for SN74ALS564BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS564BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS564BNSR?
SN74ALS564BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS564BNSR 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 SN74ALS564BNSR?
For technical support, including SN74ALS564BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS564BNSR requirements.
6.How does Aetrix verify that SN74ALS564BNSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS564BNSR 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 SN74ALS564BNSR meets industry standards.
7.What is the process for return or replacement of SN74ALS564BNSR?
All SN74ALS564BNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS564BNSR, 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 SN74ALS564BNSR part is unused and in its original packaging.
Return procedure for SN74ALS564BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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