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Texas Instruments SN74ALS574BNSR
- Part No.:
- SN74ALS574BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS574BNSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,632
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Product details
Overview
SN74ALS574B from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, designed for bus driving in digital systems. It operates at 5 V, supports up to 35 MHz clock frequency, features 20-pin SOP (NS) package, and delivers ±24 mA output drive capability. It is used in I/O port expansion and bidirectional data bus buffering in industrial control logic.
For engineers reviewing the SN74ALS574B datasheet, SN74ALS574B pinout, SN74ALS574B application, or SN74ALS574B equivalent, key selection criteria include its 3-state bus interface capability, edge-triggered synchronous data capture, low propagation delay (≤14 ns), and compatibility with TTL-level input thresholds and 5 V supply rails.
Technical Context
The SN74ALS574B implements eight independent D-type latches triggered on the rising edge of CLK, with separate 3-state output-enable (OE) control that does not affect internal register state. Its buffered inputs reduce loading on upstream drivers, and its bus-structured pinout minimizes trace crosstalk in high-density PCB layouts.
It lacks synchronous clear functionality-unlike the SN74ALS575A-making it suitable for applications requiring pure edge-triggered storage without reset coordination across all bits. Its ALS (Advanced Low-Power Schottky) logic family ensures lower power consumption than standard LS while maintaining TTL-compatible voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky), TTL-compatible input thresholds and output swing |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital rails and tolerant of minor rail droop |
| Max Clock Frequency | 35 MHz - supports high-speed data latching in legacy microprocessor data buses |
| Output Drive | ±24 mA - sufficient to directly drive 50 Ω transmission lines or multiple TTL loads |
| Propagation Delay | tPLH/tPHL ≤ 14 ns - enables reliable timing closure in sub-30 ns system cycles |
| Operating Temperature | 0°C to 70°C - rated for commercial/industrial ambient environments |
| Package | 20-pin SOP (NS) - surface-mount, RoHS-compliant, 12.0 mm × 7.5 mm footprint |
Pinout & Package
SN74ALS574B is supplied in a 20-pin small-outline package (SOP-20, package code NS), with 1.27 mm pitch, 7.5 mm body width, and 2.65 mm max height. Pin 1 is marked by a beveled corner or notch; the device uses standard dual-in-line pin numbering with OE, CLK, eight D inputs (1D–8D), eight Q outputs (1Q–8Q), VCC, and GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; decouples outputs from bus without affecting internal latch state |
| 2–9 | 1D–8D | Data inputs synchronized to rising CLK edge; TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) |
| 10 | GND | Ground reference for all logic and output stages |
| 11 | VCC | Positive supply (4.5–5.5 V); powers internal logic and output buffers |
| 12–19 | 1Q–8Q | Noninverting 3-state outputs; capable of sourcing/sinking 24 mA in active state |
| 20 | CLK | Clock input; rising-edge sensitive; minimum pulse width 14 ns high/low |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Noninverting Outputs | Enables direct connection to shared data buses without external bus transceivers |
| Bus-Structured Pinout | Groups D and Q pins contiguously to simplify PCB routing and minimize signal skew |
| Buffered Control Inputs | Reduces capacitive loading on CLK and OE lines, improving fanout and noise immunity |
| Rising-Edge Triggering | Ensures deterministic sampling of data relative to clock edge, critical for synchronous bus protocols |
| ALS Logic Family | Delivers 35 MHz operation with ~17 mA typical ICC (outputs enabled), balancing speed and power |
Applications
| Industrial PLC I/O Expansion | Legacy Microprocessor Data Bus Buffering |
|---|---|
Use Scenario: Expanding parallel I/O capacity in programmable logic controllers using discrete logic. IC Role / Device Role / Timing Role: Acts as an 8-bit input latch and output register, synchronizing sensor data and actuator commands to the PLC scan cycle clock. Use Value: Eliminates need for additional bus arbitration logic; 3-state outputs allow seamless integration into existing 8-bit data bus architecture. | Use Scenario: Interfacing Z80 or 8085-based embedded systems with external memory or peripheral chips. IC Role / Device Role / Timing Role: Captures address/data multiplexed bus signals during memory read/write cycles using system clock edge. Use Value: Provides clean, glitch-free latched data with <14 ns propagation delay, meeting tight setup/hold timing windows of vintage CPUs. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Signal Conditioning |
Use Scenario: Generating precise parallel stimulus patterns for IC functional testing. IC Role / Device Role / Timing Role: Stores pattern words from controller memory and presents them simultaneously on 8-bit output bus under trigger-controlled clock. Use Value: High-output-drive capability (24 mA) drives capacitive test loads directly; 3-state allows dynamic bus sharing between multiple pattern sources. | Use Scenario: Isolating and conditioning digital signals between DUT and ATE controller in production test fixtures. IC Role / Device Role / Timing Role: Buffers and retimes control signals (e.g., enable, strobe) to reduce jitter and improve noise margin across long fixture traces. Use Value: Buffered inputs reject crosstalk; bus-structured layout simplifies fixture wiring and improves signal integrity at 35 MHz. |
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 |
|---|---|---|---|
| SN74ALS574BN | Same ALS logic, identical electrical specs, but in 20-pin PDIP (N) package | Through-hole mounting; suited for prototyping, repair, or legacy through-hole PCBs | Select SN74ALS574BN for hand-soldered or socketed designs where SOP reflow is impractical |
| SN74AS574N | AS family: higher speed (100 MHz fmax), higher drive (±48 mA), but higher ICC (~126 mA) | Used where timing margins are tighter or bus loading exceeds ALS capability | Choose SN74AS574N only when >35 MHz operation or >24 mA drive is required; verify thermal budget |
Compared with SN74ALS574BN and SN74AS574N, the SN74ALS574B offers optimal balance of speed, power, and surface-mount compatibility for cost-sensitive industrial control and legacy bus interfaces - retaining full functional equivalence with the BN variant while enabling automated assembly.
Availability
SN74ALS574B is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy microprocessor bus buffering, and automated test fixture signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS574B 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, headquartered in Dallas, Texas.
The SN74ALS574B belongs to TI's legacy TTL-compatible logic portfolio, engineered for robustness and interoperability in industrial, military, and computing infrastructure applications where reliability and long-term supply stability are critical.
FAQ
What is the maximum clock frequency supported by the SN74ALS574B?
The SN74ALS574B supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This value is specified in the switching characteristics table of the SDAS165B datasheet and reflects guaranteed performance across the full 0°C to 70°C temperature range. The SN74ALS574B achieves this speed while maintaining ALS-family power efficiency.
Does the SN74ALS574B have a synchronous clear (CLR) input?
No, the SN74ALS574B does not include a synchronous clear input. Unlike the SN74ALS575A or SN74AS575 variants, the SN74ALS574B has only CLK and OE control inputs. Its eight D-type flip-flops are edge-triggered on CLK↑ and retain state until new data is clocked in or power is cycled. This makes the SN74ALS574B ideal for applications requiring pure data capture without global reset coordination.
What package type is used for the SN74ALS574B part number SN74ALS574BNSR?
The SN74ALS574BNSR uses a 20-pin small-outline package (SOP) with designation NS. It is RoHS-compliant, has a 1.27 mm lead pitch, measures 12.0 mm × 7.5 mm, and is supplied in tape-and-reel format (2000 units per reel). This package is distinct from the DW (SOIC) and N (PDIP) variants, offering a compact surface-mount solution optimized for automated assembly.
Can the SN74ALS574B drive standard TTL loads directly?
Yes, the SN74ALS574B can drive standard TTL loads directly. Its outputs provide 24 mA sink current and –24 mA source current at VCC = 4.5 V, exceeding the ±16 mA requirement of standard TTL. Combined with VOH ≥ 2.4 V (at IOL = 12 mA) and VOL ≤ 0.4 V, the SN74ALS574B meets all DC interface specifications for driving 74LS, 74ALS, and 74F families without level-shifting circuitry.
Is the SN74ALS574B pin-compatible with the SN74AS574 series?
The SN74ALS574B and SN74AS574 share identical pinouts and package footprints (e.g., both use 20-pin NS, DW, or N packages), but they are not functionally interchangeable without design review. While pin mapping matches, the AS family has different timing (e.g., 100 MHz vs. 35 MHz), higher drive, and greater power consumption. System-level timing and thermal validation is required before substituting SN74AS574 for SN74ALS574B.
SN74ALS574BNSR 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, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 35 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
SN74ALS574BNSR FAQ
1.How can I place an order for SN74ALS574BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS574BNSR 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 SN74ALS574BNSR reliable?
The price and inventory of SN74ALS574BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS574BNSR is usually 5 days.
3.What payment methods are accepted for SN74ALS574BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS574BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS574BNSR?
SN74ALS574BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS574BNSR 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 SN74ALS574BNSR?
For technical support, including SN74ALS574BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS574BNSR requirements.
6.How does Aetrix verify that SN74ALS574BNSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS574BNSR 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 SN74ALS574BNSR meets industry standards.
7.What is the process for return or replacement of SN74ALS574BNSR?
All SN74ALS574BNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS574BNSR, 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 SN74ALS574BNSR part is unused and in its original packaging.
Return procedure for SN74ALS574BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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