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Texas Instruments SN74ALS574BNG4
- Part No.:
- SN74ALS574BNG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ALS574BNG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,675
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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 supply, supports up to 35 MHz clock frequency, features 12 mA low-level output drive, and is rated for 0°C to 70°C industrial temperature range. It is used in I/O port expansion and bidirectional data bus interfaces.
For engineers reviewing the SN74ALS574B datasheet, SN74ALS574B pinout, SN74ALS574B application, or SN74ALS574B equivalent, key selection considerations include its 20-pin PDIP/SOIC package, edge-triggered synchronous data capture on CLK↑, independent 3-state output enable (OE), and compatibility with TTL/ALS logic families in legacy bus architectures.
Technical Context
This device implements eight independent D-type flip-flops sharing a common clock (CLK) and output-enable (OE) control. Data is latched on the low-to-high transition of CLK, while OE controls high-impedance state without affecting internal register operation - enabling concurrent data retention and new input loading.
The SN74ALS574B uses bipolar ALS (Advanced Low-Power Schottky) technology, delivering improved speed-power trade-offs over standard LS logic. Its bus-structured pinout (D inputs on one side, Q outputs on the other) minimizes PCB trace crosstalk and simplifies layout in parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - enables 35 MHz operation with lower power than standard LS. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems; not 3.3 V tolerant. |
| Max Clock Frequency | 35 MHz - determines maximum sustained data throughput in synchronous bus applications. |
| Output Drive | IOL = 12 mA / IOH = –1 mA - sufficient to drive multiple TTL loads directly on shared buses. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns - ensures timing predictability in high-speed register-to-bus transfer paths. |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments, not extended or military grade. |
| 3-State Enable Time | tPZH/tPHZ ≤ 10 ns - critical for glitch-free bus arbitration during output enable/disable transitions. |
Pinout & Package
SN74ALS574B is available in 20-pin plastic DIP (N package) and SOIC (DW package), both with identical pin mapping and bus-structured layout optimized for PCB routing efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | D1–D8 Data Inputs | Asynchronous parallel data inputs; sampled on CLK↑ edge and stored in respective flip-flops. |
| 9 | GND | Ground reference for all internal circuitry and output drivers. |
| 10, 20 | VCC | Positive supply (4.5–5.5 V); dual VCC pins reduce power distribution inductance. |
| 11 | CLK | Global clock input; rising-edge sensitive; synchronizes all eight flip-flop updates. |
| 12–19 | Q1–Q8 Outputs | 3-state noninverting buffered outputs; high-impedance when OE is high. |
| 19 | OE | Active-low output enable; independent of clock and data - allows dynamic bus release without disrupting register state. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Noninverting Outputs | Enables direct connection to shared data buses without external buffers; eliminates contention during multi-driver arbitration. |
| Bus-Structured Pinout | D inputs on left side (pins 1–8), Q outputs on right side (pins 12–19) - reduces layer crossings and signal skew in dense PCB layouts. |
| Buffered Control Inputs | CLK and OE inputs include Schottky-clamped buffers - improves noise immunity and ensures clean edge detection under capacitive loading. |
| Independent Output Enable | OE does not affect internal flip-flop operation - permits data hold, update, or readback while outputs remain tri-stated. |
| ALS Technology | Delivers 35 MHz max clock rate with typical ICC of 17 mA (outputs enabled), balancing speed and power in legacy 5 V systems. |
Applications
| Industrial PLC I/O Modules | Legacy Computer Backplane Interfaces |
|---|---|
Use Scenario: Expanding parallel I/O capability in programmable logic controllers using 8-bit data buses. IC Role / Device Role / Timing Role: Acts as an output latch and bus driver, holding control signals (e.g., relay actuation, sensor enable) until next clock cycle. Use Value: Provides deterministic, edge-triggered output update synchronized to system clock - eliminating metastability and ensuring repeatable scan-cycle timing. | Use Scenario: Interfacing CPU address/data buses to peripheral cards in vintage minicomputer backplanes (e.g., PDP-11, VAX). IC Role / Device Role / Timing Role: Serves as a bidirectional bus transceiver latch, isolating card-local registers from shared bus activity. Use Value: Enables hot-swap-safe bus isolation via OE control - allowing card insertion/removal without disrupting active bus transactions on other slots. |
| Test Equipment Pattern Generators | Avionics Data Acquisition Systems |
Use Scenario: Generating precise, synchronized stimulus waveforms for digital circuit validation. IC Role / Device Role / Timing Role: Stores and presents 8-bit test patterns on each CLK↑, with OE enabling pattern burst gating. Use Value: Achieves sub-15 ns setup/hold timing margins - supporting reliable pattern generation at 35 MHz for high-speed logic analyzer calibration. | Use Scenario: Capturing sensor telemetry (e.g., pressure, temperature) in airborne flight control subsystems. IC Role / Device Role / Timing Role: Latches analog-to-digital converter outputs before multiplexing onto a shared MIL-STD-1553 or ARINC-429 interface bus. Use Value: Maintains data integrity across vibration-prone environments via robust ALS-level noise margin and guaranteed 0°C–70°C operation. |
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 |
|---|---|---|---|
| SN74AS574N | Faster propagation delay (≤9 ns), higher drive (IOL = 32 mA), but consumes more current (ICC up to 126 mA). | Better suited for high-speed backplane designs requiring <10 ns timing margins; less ideal for power-constrained legacy systems. | Select SN74AS574N only if system timing budget demands sub-10 ns delays and power supply can support >100 mA per IC. |
| SN74LS374N | Slower max clock (25 MHz), lower drive (IOL = 8 mA), standard LS family - higher power-delay product than ALS. | Compatible drop-in replacement where existing LS-based designs require minimal BOM change and speed is not limiting. | Choose SN74LS374N for cost-sensitive, lower-speed upgrades where board layout and thermal design are already optimized for LS logic. |
Compared with SN74AS574N and SN74LS374N, SN74ALS574B delivers optimal balance of speed (35 MHz), power (17 mA ICC), and noise immunity for industrial bus interfaces - making it the preferred choice where ALS-family compatibility and proven field reliability are required.
Availability
SN74ALS574B is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy computer backplane interfaces, and test equipment pattern generators 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
SN74ALS574B belongs to TI's legacy TTL-compatible logic portfolio, engineered specifically for robust, high-reliability bus interfacing in commercial and industrial control systems operating at 5 V.
FAQ
What is the maximum clock frequency supported by SN74ALS574B?
The SN74ALS574B supports a maximum clock frequency of 35 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This value is verified per the SDAS165B datasheet switching characteristics table and reflects guaranteed performance across the full commercial temperature range. Exceeding this frequency may result in setup/hold violations or metastability in the SN74ALS574B flip-flops.
Does SN74ALS574B include a synchronous clear (CLR) function?
No, SN74ALS574B does not include a synchronous clear input. The CLR pin is present only on SN74ALS575A and SN74AS575 variants. SN74ALS574B relies solely on clocked data capture and 3-state output control via OE - meaning reset functionality must be implemented externally using the OE line or upstream logic. This distinction is explicitly documented in the function tables and logic diagrams of the SN74ALS574B datasheet.
What packages are available for SN74ALS574B?
SN74ALS574B is offered in 20-pin plastic DIP (N package) and SOIC (DW package), both with identical pinout and electrical specifications. The N package (e.g., SN74ALS574BN) is through-hole compatible for prototyping and legacy assembly, while the DW package (e.g., SN74ALS574BDWR) supports surface-mount production with tape-and-reel delivery (2000 units per reel). No ceramic or military-grade variants exist for SN74ALS574B.
Can SN74ALS574B drive standard TTL loads directly?
Yes, SN74ALS574B can drive standard TTL loads directly. Its low-level output current (IOL = 12 mA minimum) exceeds the 1.6 mA sink requirement of one standard TTL input, and its high-level output voltage (VOH ≥ 2.4 V at IOH = –1 mA) meets TTL VIH thresholds. This allows SN74ALS574B to interface with legacy 74LS and 74S logic without external buffers - a key design advantage confirmed in the "Drive Bus Lines Directly" feature statement.
Is SN74ALS574B RoHS compliant?
Yes, SN74ALS574B versions with suffixes E4 (e.g., SN74ALS574BNE4) and R (e.g., SN74ALS574BDWR) are RoHS compliant, featuring NiPdAu (NIPDAU) lead finish. Non-compliant variants (e.g., SN74ALS574BN) use SnPb (SNPB) finish and are restricted to exempt applications. Compliance status is verified per TI's Package Option Addendum and applies only to currently active orderable part numbers shipped after July 2006.
SN74ALS574BNG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ALS574BNG4 FAQ
1.How can I place an order for SN74ALS574BNG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS574BNG4 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 SN74ALS574BNG4 reliable?
The price and inventory of SN74ALS574BNG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS574BNG4 is usually 5 days.
3.What payment methods are accepted for SN74ALS574BNG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS574BNG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS574BNG4?
SN74ALS574BNG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS574BNG4 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 SN74ALS574BNG4?
For technical support, including SN74ALS574BNG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS574BNG4 requirements.
6.How does Aetrix verify that SN74ALS574BNG4 is sourced from the original manufacturer or authorized distributors?
All SN74ALS574BNG4 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 SN74ALS574BNG4 meets industry standards.
7.What is the process for return or replacement of SN74ALS574BNG4?
All SN74ALS574BNG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS574BNG4, 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 SN74ALS574BNG4 part is unused and in its original packaging.
Return procedure for SN74ALS574BNG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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