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Texas Instruments SN74ALS874BNSR
- Part No.:
- SN74ALS874BNSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS874BNSR.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 24SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,300
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Product details
Overview
SN74ALS874BNSR from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with 3-state bus-driver outputs, asynchronous clear (CLR), true logic outputs, and bus-structured pinout. It operates at 5 V, supports up to 30 MHz clock frequency, delivers ±24 mA output drive, and is rated for 0°C to 70°C industrial temperature range. It is used in bidirectional bus interfaces and I/O port buffering.
For engineers reviewing the SN74ALS874BNSR datasheet, SN74ALS874BNSR pinout, SN74ALS874BNSR application, or SN74ALS874BNSR equivalent, key selection considerations include its 3-state bus-driving capability, asynchronous clear functionality, true-output logic configuration, 24-pin SOIC (DW) package, and compatibility with ALS logic families in legacy industrial control and data acquisition systems.
Technical Context
This device integrates two independent 4-bit D-type registers, each with edge-triggered clock (CLK↑), active-low asynchronous clear (CLR), and 3-state output enable (OE). Its bus-structured pinout enables direct connection to data buses without external routing.
Each register latches data on the low-to-high clock transition; outputs are high-impedance when OE is high. The SN74ALS874B variant uses noninverting Q outputs and CLR inputs - distinct from the SN74ALS876A's PRE-based inverting architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL-compatible voltage thresholds and reduced power vs. standard LS. |
| Function | Dual 4-bit edge-triggered D flip-flop with 3-state outputs - implements two independent 4-bit latch/buffer channels. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital rails; absolute max 7 V. |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous data capture in bus interface applications. |
| Output Drive | ±24 mA (IOL/IOH) - sufficient to directly drive PCB traces and multiple TTL inputs without buffers. |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns (VCC = 4.5–5.5 V, CL = 50 pF) - enables timing-critical bus synchronization. |
Pinout & Package
SN74ALS874BNSR is packaged in a 24-pin plastic small-outline integrated circuit (SOIC-DW), 300-mil body width, with gull-wing leads and RoHS-compliant NiPdAu finish (Level-1 MSL).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous Clear Input | Active-low reset for respective 4-bit register; forces Q1–Q4 low independently of CLK. |
| 1OE, 2OE | Output Enable Input | Active-low control for 3-state output drivers; disables all four Q outputs when high. |
| 1CLK, 2CLK | Clock Input | Edge-triggered input; data latched on low-to-high transition for corresponding register. |
| 1D1–1D4, 2D1–2D4 | Data Inputs | Parallel 4-bit data inputs per register; sampled at CLK↑ and held until next clock edge. |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting Outputs | True (noninverted) registered outputs; high-impedance when OE is deasserted. |
| VCC, GND | Power Supply | Single 5 V supply; decoupling required near pins 12 (GND) and 13 (VCC) for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Bus Driver Outputs | Enables direct connection to shared data buses with controlled contention avoidance via OE. |
| Bus-Structured Pinout | Minimizes PCB trace crossovers and simplifies layout for parallel 4-bit data paths. |
| Asynchronous Clear (CLR) | Allows immediate register reset without waiting for clock edge - critical for system initialization. |
| ALS Logic Compatibility | Guarantees interoperability with TI's ALS, LS, and TTL families while reducing power vs. LS. |
| SOIC-DW Packaging | Surface-mount 24-pin footprint supports automated assembly and offers thermal/mechanical reliability in industrial modules. |
Applications
| Industrial PLC I/O Module | Legacy Data Acquisition Bus Interface |
|---|---|
Use Scenario: Isolating and buffering parallel sensor data from analog front-end ADCs to microcontroller data bus. IC Role / Device Role / Timing Role: SN74ALS874BNSR acts as a synchronized 8-bit input latch with 3-state isolation, capturing sampled data on CLK↑ and presenting it to the host bus only when OE is asserted. Use Value: Prevents bus contention during sampling; provides deterministic timing alignment across 8 bits using single-edge clocking. | Use Scenario: Driving address/data multiplexed bus lines in retro-computing or test equipment controller boards. IC Role / Device Role / Timing Role: SN74ALS874BNSR serves as a dual-port bidirectional bus transceiver buffer, with one register holding command data and the other holding status responses. Use Value: Eliminates need for discrete bus switches; leverages built-in 3-state control and ALS speed to meet tight 30 MHz bus timing. |
| Embedded Control Register Bank | Test Fixture Signal Conditioning |
Use Scenario: Holding configuration bits for FPGA or CPLD I/O banks in programmable logic development systems. IC Role / Device Role / Timing Role: SN74ALS874BNSR functions as an 8-bit static register bank, loaded once at power-up via microcontroller GPIO and held stable until reconfigured. Use Value: Provides glitch-free, noise-immune storage with hardware reset (CLR) - more robust than SRAM-based alternatives in EMI-prone environments. | Use Scenario: Level-shifting and driving high-capacitance test probe lines in automated board-level test (BLT) fixtures. IC Role / Device Role / Timing Role: SN74ALS874BNSR acts as a buffered signal conditioner, translating low-drive MCU outputs into robust 24 mA signals capable of charging fixture capacitance within nanosecond timing windows. Use Value: Ensures reliable signal integrity over long fixture traces; eliminates timing skew between parallel test lines via synchronous edge-triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit 3-state D flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS874DW | Faster propagation (≤8.5 ns), higher drive (±48 mA), but higher ICC (up to 160 mA); AS family, not ALS. | Better suited for high-speed, low-skew timing-critical buses where power budget allows. | Select SN74AS874DW only if >30 MHz operation or <10 ns timing margins are required; verify thermal derating. |
| SN74ALS876ANSR | Inverting Q outputs and active-low PRE instead of CLR; identical pinout and timing specs otherwise. | Used where active-low preset behavior is needed (e.g., default-low initialization), not asynchronous clear. | Choose SN74ALS876ANSR only when logic polarity and reset/preset function match system requirements - not a drop-in replacement. |
Compared with SN74ALS874BNSR, SN74AS874DW trades higher power for greater speed and drive strength, while SN74ALS876ANSR maintains identical timing and packaging but changes functional logic (PRE vs. CLR, inverted outputs), requiring schematic and firmware validation before substitution.
Availability
SN74ALS874BNSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy data acquisition systems, and embedded control register banks requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS874BNSR 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 for industrial, automotive, and communications markets.
The SN74ALS874BNSR belongs to TI's legacy ALS logic product line, designed specifically for high-reliability, medium-speed bus interfacing in industrial control and instrumentation systems where power efficiency and TTL compatibility are essential.
FAQ
What logic family does the SN74ALS874BNSR belong to, and how does it differ from standard TTL?
The SN74ALS874BNSR belongs to the Advanced Low-Power Schottky (ALS) logic family. It offers lower power consumption than standard TTL or LS while maintaining compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) and improved speed. Unlike standard TTL, ALS uses Schottky clamping to prevent transistor saturation, reducing propagation delay and power dissipation - making SN74ALS874BNSR ideal for battery-sensitive or thermally constrained industrial modules.
Does the SN74ALS874BNSR support bidirectional data flow, and how is direction controlled?
The SN74ALS874BNSR does not implement internal bidirectional control logic; however, its dual 4-bit 3-state outputs enable bidirectional bus usage when paired with complementary devices or external control. Direction is managed externally via OE signals and system-level protocol - for example, one register drives data onto the bus while the other captures incoming data, with OE sequencing coordinated by a controller. This architecture makes SN74ALS874BNSR suitable for custom bidirectional I/O ports in legacy systems.
What is the maximum clock frequency supported by the SN74ALS874BNSR, and under what conditions is it guaranteed?
The SN74ALS874BNSR guarantees a maximum clock frequency of 30 MHz under recommended operating conditions: VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = R2 = 500 Ω, and operating temperature 0°C to 70°C. This rating is validated per TI's SDAS061C datasheet switching characteristics table and applies to both registers independently. Exceeding 30 MHz may result in setup/hold violations or metastability, especially with heavy capacitive loads.
Can the SN74ALS874BNSR be used in place of the SN74ALS876A, and what design changes are required?
No - SN74ALS874BNSR cannot be used as a direct replacement for SN74ALS876A without design changes. While pin-compatible and functionally similar, SN74ALS874BNSR uses active-low asynchronous clear (CLR) and noninverting Q outputs, whereas SN74ALS876A uses active-low preset (PRE) and inverting Q outputs. Substituting SN74ALS874BNSR requires inverting all Q-related logic paths and redesigning reset control timing, making it unsuitable for drop-in replacement in existing SN74ALS876A designs.
What package type and lead finish does the SN74ALS874BNSR use, and is it RoHS compliant?
The SN74ALS874BNSR uses a 24-pin plastic small-outline (SOIC-DW) package with NiPdAu (nickel-palladium-gold) lead finish, rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH). It is RoHS compliant per TI's packaging addendum, with "Yes" listed for RoHS in the official orderable part documentation. The DW package measures 7.5 mm × 15.4 mm with 1.27 mm pitch, optimized for automated SMT assembly in industrial PCB manufacturing.
SN74ALS874BNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 24-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- 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):
- 21 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SO
SN74ALS874BNSR FAQ
1.How can I place an order for SN74ALS874BNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS874BNSR 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 SN74ALS874BNSR reliable?
The price and inventory of SN74ALS874BNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS874BNSR is usually 5 days.
3.What payment methods are accepted for SN74ALS874BNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS874BNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS874BNSR?
SN74ALS874BNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS874BNSR 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 SN74ALS874BNSR?
For technical support, including SN74ALS874BNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS874BNSR requirements.
6.How does Aetrix verify that SN74ALS874BNSR is sourced from the original manufacturer or authorized distributors?
All SN74ALS874BNSR 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 SN74ALS874BNSR meets industry standards.
7.What is the process for return or replacement of SN74ALS874BNSR?
All SN74ALS874BNSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS874BNSR, 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 SN74ALS874BNSR part is unused and in its original packaging.
Return procedure for SN74ALS874BNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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