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Texas Instruments SN74ALS564BNS
- Part No.:
- SN74ALS564BNS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS564BNS.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
SN74ALS564BNS 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 with buffered OE and CLK inputs.
For engineers reviewing the SN74ALS564BNS datasheet, SN74ALS564BNS pinout, SN74ALS564BNS application, or SN74ALS564BNS equivalent, this device serves as a high-drive, low-propagation-delay register for bidirectional data buses, I/O port expansion, and synchronous latch interfaces in legacy industrial control and instrumentation designs.
Technical Context
This device implements eight independent D-type latches triggered on the low-to-high clock transition, each with inverting output logic and separate 3-state enable control. Internal operation remains fully functional during output disable - data retention and new sampling continue unaffected by OE state.
It uses ALS (Advanced Low-Power Schottky) bipolar technology, delivering TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V), fast switching (tPLH/tPHL ≤ 14 ns at VCC = 5 V), and robust bus-driving capability (IOL = 24 mA, IOH = –2.6 mA) without external pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL compatibility with reduced power vs standard LS. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control applications. |
| Max Clock Frequency | 30 MHz - enables high-speed synchronous data capture in bus arbitration and register file interfaces. |
| Output Drive | 24 mA sink / –2.6 mA source - directly drives terminated TTL/ALS bus lines without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns - supports tight timing margins in multi-stage pipeline or address/data latch designs. |
| 3-State Enable Time | tPZH ≤ 18 ns, tPHZ ≤ 10 ns - allows rapid bus turnaround for half-duplex communication protocols. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with regulated 5 V rails and tolerant of typical power supply ripple. |
Pinout & Package
SOP-20 (NS package), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low global 3-state control - disables all eight outputs simultaneously without affecting internal latch state. |
| 2–9 | 1D–8D | Data inputs - sampled on rising CLK edge; inverted and latched to corresponding Q outputs. |
| 10 | GND | Ground reference - shared return for logic and output current paths. |
| 11–18 | 1Q–8Q | Inverting 3-state outputs - present complement of D input when OE = L; high-Z when OE = H. |
| 19 | CLK | Clock input - edge-triggered rising-edge sampling; internally buffered for noise immunity and fanout. |
| 20 | VCC | Positive supply - powers internal logic and output drivers; requires local 0.1 µF bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Input/output pairing (e.g., 1D/1Q adjacent) minimizes trace crossovers and simplifies PCB layout for parallel data buses. |
| Inverting 3-state outputs | Eliminates need for external inverters in complemented bus architectures while enabling clean bus contention avoidance. |
| Buffered control inputs | OE and CLK inputs include Schottky-clamped buffers - improve noise margin and support ≥10 LS-TTL fanout. |
| Independent data retention during OE high | Latches retain valid state and accept new data even while outputs are disabled - essential for pipelined bus arbitration. |
| ALS process optimization | Delivers 30 MHz speed with ~20 mA ICC (outputs low) - balances performance and power in legacy 5 V systems. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding parallel digital I/O to a microcontroller-based programmable logic controller using a 20-pin ribbon cable backplane. IC Role / Device Role / Timing Role: Acts as an output register latching control signals (e.g., relay drivers) and input register capturing sensor status, synchronized to system clock. Use Value: Enables single-cycle read/write of all 8 bits with deterministic setup/hold timing (tsu = 15 ns, th = 0 ns), reducing firmware overhead. |
Use Scenario: Bridging a modern FPGA development board to legacy TTL peripherals (e.g., EPROM, parallel ADCs) via a 5 V bus. IC Role / Device Role / Timing Role: Provides level-shifted, 3-state-isolated data path between mismatched logic families while preserving signal integrity. Use Value: Delivers 24 mA drive into 50 Ω terminated lines and sub-15 ns propagation delay - eliminates need for discrete buffer arrays. |
| Test Equipment Digital Pattern Generator | Avionics Maintenance Diagnostic Interface |
|
Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing in automated test equipment (ATE). IC Role / Device Role / Timing Role: Functions as a clocked pattern latch, accepting parallel data from a shift register or FIFO and releasing it on CLK edge. Use Value: Supports 30 MHz pattern rates with guaranteed tPLH/tPHL ≤ 14 ns - meets timing closure for high-speed digital stimulus generation. |
Use Scenario: Interfacing ground-support diagnostic tools to aging avionics subsystems using MIL-STD-1553 or discrete TTL signaling. IC Role / Device Role / Timing Role: Serves as a fault-isolated data register for reading/writing discrete control/status lines in safety-critical maintenance mode. Use Value: High noise immunity (buffered inputs), stable 0–70°C operation, and proven field reliability make it suitable for certified repair depot use. |
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 tri-state buffers for bus sharing. | Only suitable where unidirectional latching without bus contention management is acceptable. | Select only if output inversion is undesirable and bus isolation is handled elsewhere in design. |
| SN74ACT574N | CMOS ACT family, 5 V tolerant, non-inverting, 3-state - higher speed (fmax = 100+ MHz) but different VIH/VIL thresholds. | Requires level-shifting or redesign if interfacing with legacy ALS/LS TTL logic due to CMOS input sensitivity. | Prefer for new designs needing lower power and higher speed; avoid in mixed-ALS/LS systems without interface validation. |
Compared with SN74ALS273N and SN74ACT574N, the SN74ALS564BNS uniquely combines inverting 3-state outputs, ALS-compatible thresholds, and bus-optimized pinout - making it irreplaceable in legacy bus-hold, bidirectional data transfer, and space-constrained retrofit applications where pin-for-pin compatibility and electrical behavior must match original specifications.
Availability
SN74ALS564BNS is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and test equipment digital pattern generators requiring stable component supply across extended product lifecycles.
Supply support for SN74ALS564BNS 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 reach.
The SN74ALS564BNS belongs to TI's legacy ALS logic family - engineered for high-speed, low-power 5 V TTL-compatible digital interfacing in mission-critical industrial and instrumentation systems.
FAQ
What logic family does SN74ALS564BNS belong to, and how does it differ from standard LS TTL?
The SN74ALS564BNS belongs to the Advanced Low-Power Schottky (ALS) logic family. Compared to standard LS TTL, it offers approximately 2× higher speed (30 MHz vs ~15 MHz) and ~30% lower power consumption at equivalent loads, achieved through optimized transistor sizing and Schottky clamping. Its VIH/VIL thresholds (2.0 V / 0.8 V) and output drive (24 mA sink) remain fully compatible with existing LS and TTL systems, allowing drop-in replacement in most cases where timing margins permit.
Does SN74ALS564BNS support hot insertion or live bus swapping?
No, the SN74ALS564BNS is not rated for hot insertion. Its absolute maximum ratings specify that voltage applied to a disabled 3-state output must not exceed 5.5 V, and no built-in bus-fault protection, current limiting, or power-up sequencing features are provided. For live bus applications, external series resistors, TVS diodes, or dedicated hot-swap controllers must be added - the SN74ALS564BNS itself assumes stable VCC and controlled OE assertion prior to bus connection.
Can SN74ALS564BNS operate reliably at 4.5 V supply, and what performance trade-offs occur?
Yes, SN74ALS564BNS is fully specified down to 4.5 V per its recommended operating conditions. At 4.5 V, maximum clock frequency reduces from 30 MHz to 22 MHz, propagation delays increase slightly (tPLH/tPHL ≤ 24 ns), and output drive weakens (IOL drops to 12 mA). However, all timing parameters - including tsu = 15 ns and th = 4 ns - remain guaranteed, ensuring reliable operation in brown-out or loosely regulated 5 V environments common in industrial power supplies.
Is SN74ALS564BNS pin-compatible with SN74ALS564BN or SN74ALS564BDW?
Yes, SN74ALS564BNS is functionally and pinout-compatible with SN74ALS564BN (PDIP-20) and SN74ALS564BDW (SOIC-20): all share identical 20-pin numbering, electrical characteristics, and timing behavior. The NS package differs only in physical form factor (small-outline plastic with gull-wing leads) and packaging (tape-and-reel vs tube), making it suitable for automated SMT assembly while maintaining full interchangeability at the circuit level.
What is the significance of the "B" suffix in SN74ALS564BNS, and how does it relate to earlier versions?
The "B" suffix in SN74ALS564BNS denotes the second-generation revision of the device, introduced in the January 1995 datasheet revision (SDAS164B). It reflects improvements in process consistency, tighter AC timing specifications (e.g., reduced tPLH/tPHL max), enhanced ESD robustness, and updated thermal and reliability qualification. Earlier non-B versions (e.g., SN74ALS564N) are obsolete and not recommended; the SN74ALS564BNS is the only currently manufactured and supported variant.
SN74ALS564BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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):
- 30 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ALS564BNS FAQ
1.How can I place an order for SN74ALS564BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS564BNS 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 SN74ALS564BNS reliable?
The price and inventory of SN74ALS564BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS564BNS is usually 5 days.
3.What payment methods are accepted for SN74ALS564BNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS564BNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS564BNS?
SN74ALS564BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS564BNS 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 SN74ALS564BNS?
For technical support, including SN74ALS564BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS564BNS requirements.
6.How does Aetrix verify that SN74ALS564BNS is sourced from the original manufacturer or authorized distributors?
All SN74ALS564BNS 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 SN74ALS564BNS meets industry standards.
7.What is the process for return or replacement of SN74ALS564BNS?
All SN74ALS564BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS564BNS, 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 SN74ALS564BNS part is unused and in its original packaging.
Return procedure for SN74ALS564BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74ALS564BNS Tags
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