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Texas Instruments SN74ALS564BDWRG4
- Part No.:
- SN74ALS564BDWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALS564BDWRG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,527
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Product details
Overview
SN74ALS564BDWRG4 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 SOIC (DW) package, and delivers ±24 mA output drive capability. It is used in bidirectional bus interfaces and I/O port buffering where bus contention control and data latching are required.
For engineers reviewing the SN74ALS564BDWRG4 datasheet, SN74ALS564BDWRG4 pinout, SN74ALS564BDWRG4 application, or SN74ALS564BDWRG4 equivalent, key selection criteria include its inverting 3-state output architecture, bus-structured pinout, 15 ns data setup time, 4 ns hold time, and compatibility with legacy ALS logic families in industrial control and instrumentation systems.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the low-to-high clock transition, with separate 3-state output enable (OE) control that does not affect internal latch operation. Its buffered OE and CLK inputs reduce loading on upstream drivers and improve noise immunity.
The inverting output structure provides active-low bus drive capability, while the bus-organized pinout (D inputs on one side, Q outputs on the other) simplifies PCB routing in high-density backplane or motherboard designs. All timing parameters-including tPLH/tPHL propagation delays (≤14 ns), tPZH/tPHZ enable/disable times (≤18 ns), and tw minimum pulse width (14 ns)-are specified across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input thresholds and output voltage levels |
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5 V rail tolerances |
| Max Clock Frequency | 30 MHz - supports high-speed data capture in synchronous bus architectures |
| Output Drive | 24 mA sink / –2.6 mA source - sufficient to directly drive multiple TTL loads without external buffers |
| Propagation Delay | 14 ns max (CLK to Q) - enables tight timing budgets in register-based control paths |
| Setup/Hold Times | 15 ns setup / 0 ns hold - simplifies timing closure with minimal external delay compensation |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial equipment |
Pinout & Package
SN74ALS564BDWRG4 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. Pin 1 is marked by a beveled corner or notch; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: disables all Q outputs into high-impedance state without affecting internal latch state |
| 2–9 | 1D–8D | Data inputs for eight D-type flip-flops; sampled on rising CLK edge |
| 10 | GND | Ground reference for logic and power return path |
| 11–18 | 1Q–8Q | Inverting 3-state outputs; Q = NOT(D) when OE = L and CLK↑ occurs |
| 19 | CLK | Clock input - edge-triggered on low-to-high transition; internally buffered |
| 20 | VCC | Positive supply terminal (4.5–5.5 V); decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables direct connection to shared data buses without external inverters or bus transceivers |
| Bus-structured pinout | D inputs (pins 2–9) and Q outputs (pins 11–18) are grouped on opposite sides, minimizing trace crossovers |
| Buffered control inputs | OE and CLK inputs have internal buffers, reducing fanout requirements and improving noise margin |
| Independent OE control | Allows retention of latched data during output disable - critical for glitch-free bus arbitration |
| ALS logic performance | Combines TTL speed (30 MHz) with lower power than standard LS, enabling higher density in legacy systems |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
|
Use Scenario: Isolating and latching sensor/actuator signals in programmable logic controller racks with parallel backplanes. IC Role / Device Role / Timing Role: Acts as an octal input register with 3-state outputs, capturing real-time field data on CLK↑ and presenting it to the CPU bus only when enabled. Use Value: Eliminates need for discrete buffers and level shifters; inverting outputs match common open-collector bus signaling conventions. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller-based controllers via parallel data lanes. IC Role / Device Role / Timing Role: Provides synchronized, direction-controlled data latching between mismatched clock domains using OE-gated bus access. Use Value: Enables deterministic read/write handshaking with 14 ns propagation delay and zero hold-time requirement. |
| Test Equipment Digital Pattern Generators | Avionics Data Acquisition Units |
|
Use Scenario: Storing and outputting calibrated test vectors in automated test systems requiring precise timing alignment. IC Role / Device Role / Timing Role: Functions as a static pattern register-data loaded synchronously, then driven onto bus under software-controlled OE. Use Value: Buffered CLK and OE ensure clean edges across 20-pin layout; 24 mA drive sustains signal integrity over 15 cm ribbon cables. |
Use Scenario: Capturing discrete status signals (e.g., switch closures, relay states) in airborne mission computers with MIL-STD-883 heritage requirements. IC Role / Device Role / Timing Role: Serves as a radiation-tolerant (via design heritage) input latch for non-volatile status monitoring in Class A avionics subsystems. Use Value: ALS family's proven reliability in extended-temperature environments supports DO-254 compliance without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS273N | Non-inverting outputs, no 3-state capability, identical pinout except Q pins unidirectional | Requires external tristate buffers for bus sharing; unsuitable for bidirectional or shared-bus use | Select when output inversion is undesirable and bus isolation is handled elsewhere |
| SN74ACT574DW | CMOS ACT family, 5 V tolerant, non-inverting, 3-state, but requires 2.0 V min VIH and has different timing margins | Higher noise immunity and lower ICC, but incompatible with ALS-level VIL/VOL thresholds | Select for mixed-voltage systems needing CMOS input compatibility and lower power, not for drop-in ALS replacement |
Compared with SN74ALS564BDWRG4, SN74ALS273N lacks 3-state control and inverting outputs-limiting bus-driving utility-while SN74ACT574DW offers improved speed and power but requires redesign of input threshold margins and timing constraints.
Availability
SN74ALS564BDWRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, and test equipment digital pattern generators requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS564BDWRG4 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, delivering reliable, high-performance components for industrial, automotive, and aerospace applications.
SN74ALS564BDWRG4 belongs to TI's legacy ALS logic product line, engineered for backward compatibility with 74LS/74S systems while offering improved speed-power trade-offs in commercial-temperature embedded control applications.
FAQ
What logic family does SN74ALS564BDWRG4 belong to, and how does it differ from standard LS?
SN74ALS564BDWRG4 is part of the Advanced Low-Power Schottky (ALS) logic family. Compared to standard 74LS, it delivers higher speed (30 MHz vs. ~25 MHz for LS564) with lower power consumption (ICC ≈ 16–30 mA vs. ~35 mA for LS), achieved through optimized transistor sizing and reduced internal capacitance. The SN74ALS564BDWRG4 maintains full pin and functional compatibility with 74LS564 but improves timing margins and noise immunity.
Does SN74ALS564BDWRG4 support true bidirectional bus operation?
SN74ALS564BDWRG4 does not support true bidirectional data flow per pin, but enables controlled bidirectional bus usage via its 3-state outputs and separate OE control. When paired with complementary input registers (e.g., SN74ALS244), it forms a full bidirectional bus interface-data flows from D→Q when OE is low, and bus lines float when OE is high, allowing other devices to drive the same lines. This architecture is widely deployed in ISA and proprietary parallel buses.
What is the significance of the "G4" suffix in SN74ALS564BDWRG4?
The "G4" suffix in SN74ALS564BDWRG4 indicates TI's Green packaging standard: lead-free (Pb-free) construction with NiPdAu lead finish, RoHS-compliant materials, and MSL Level-1 moisture sensitivity rating. It replaces earlier "G3" or non-G variants and ensures compatibility with modern reflow profiles while maintaining identical electrical and thermal specifications as the base SN74ALS564BDW part.
Can SN74ALS564BDWRG4 operate reliably at 5.5 V supply?
Yes, SN74ALS564BDWRG4 is fully characterized for operation at VCC = 5.5 V per its recommended operating conditions. At this voltage, VOH remains ≥2.4 V (IOL = 12 mA), VOL stays ≤0.4 V, and propagation delays tighten slightly (e.g., tPLH drops to 3 ns typical). However, ICC increases to ~30 mA in the disabled state, so thermal design must account for worst-case power dissipation across all output states.
Is there a pin-compatible military-grade version of SN74ALS564BDWRG4?
No-SN74ALS564BDWRG4 itself is a commercial-grade (0°C to 70°C) SOIC device. Its military-grade counterpart is SN54ALS564BJ (CDIP package, –55°C to 125°C), which shares identical logic function, timing, and DC specs but differs in package type, marking, and qualification. There is no DW-packaged 54-series variant; designers requiring extended temperature range must use the J or W ceramic DIP packages and adapt board layout accordingly.
SN74ALS564BDWRG4 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
SN74ALS564BDWRG4 FAQ
1.How can I place an order for SN74ALS564BDWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS564BDWRG4 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 SN74ALS564BDWRG4 reliable?
The price and inventory of SN74ALS564BDWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS564BDWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ALS564BDWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS564BDWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS564BDWRG4?
SN74ALS564BDWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS564BDWRG4 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 SN74ALS564BDWRG4?
For technical support, including SN74ALS564BDWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS564BDWRG4 requirements.
6.How does Aetrix verify that SN74ALS564BDWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS564BDWRG4 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 SN74ALS564BDWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS564BDWRG4?
All SN74ALS564BDWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS564BDWRG4, 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 SN74ALS564BDWRG4 part is unused and in its original packaging.
Return procedure for SN74ALS564BDWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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