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Texas Instruments SN74ALS874BNS
- Part No.:
- SN74ALS874BNS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74ALS874BNS.pdf
- Description:
- IC D-TYPE POS TRG DUAL 24SO
- Quantity:
- Payment:
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Inventory:3,678
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Product details
Overview
SN74ALS874BNS from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with noninverting 3-state outputs, designed as a bus-oriented register driver. It features asynchronous clear (CLR), true logic outputs, 24-pin SOIC (DW) package, 30 MHz max clock frequency, and 24 mA output sink capability - enabling direct TTL/LS bus driving in I/O port and buffer register applications.
For engineers reviewing the SN74ALS874BNS datasheet, SN74ALS874BNS pinout, SN74ALS874BNS application, or SN74ALS874BNS equivalent, this device serves as a high-drive, low-propagation-delay bus interface IC for legacy industrial control, test equipment, and backplane data path designs requiring deterministic edge-triggered storage with output enable control.
Technical Context
The SN74ALS874BNS implements two independent 4-bit D-type flip-flop sections, each with separate clock (CLK), clear (CLR), and output-enable (OE) inputs. Data is latched on the low-to-high transition of CLK, and Q outputs reflect D inputs only when OE is low and CLR is high.
Its 3-state outputs support bidirectional bus arbitration via OE-controlled high-impedance states, while the bus-structured pinout (e.g., grouped D and Q terminals) minimizes trace skew in parallel data paths. The device operates across 0°C to 70°C with VCC = 4.5–5.5 V and meets ALS family propagation delay specs (tPLH/tPHL ≤ 14 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Low-Power Schottky (ALS) - ensures TTL-compatible voltage thresholds with reduced power vs. standard LS. |
| Function | Dual 4-bit edge-triggered D flip-flop with noninverting Q and 3-state outputs - supports synchronous data capture and bus isolation. |
| Max Clock Frequency | 30 MHz - enables reliable operation in high-speed parallel data transfer up to 30 million state updates per second. |
| Output Drive | 24 mA sink (IOL), 2.6 mA source (IOH) - directly drives 15+ TTL loads without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 14 ns (VCC = 5 V, CL = 50 pF) - guarantees sub-15 ns timing margin for 30 MHz bus cycles. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and industrial control panels. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5 V rails and tolerant of typical ±5% supply variation. |
Pinout & Package
SN74ALS874BNS is supplied in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), measuring 15.4 mm × 7.5 mm × 2.35 mm, with 1.27 mm lead pitch and RoHS-compliant CU NIPDAU finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Resets corresponding 4-bit section's Q outputs to low independently of clock - used for system initialization or fault recovery. |
| 1OE, 2OE | Output enable input (active-low) | Places associated Q1–Q4 outputs in high-impedance state - enables shared bus arbitration and prevents contention. |
| 1CLK, 2CLK | Clock input (positive-edge triggered) | Samples D1–D4 inputs on rising edge - defines precise timing boundary for data registration in synchronous systems. |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit input lanes per section - accepts TTL-level signals for storage into respective flip-flop registers. |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting 3-state outputs | Drive external bus lines directly; output state reflects stored D value only when OE is low and CLR is high. |
| VCC, GND | Power supply pins | Single 5 V supply with dedicated ground - decoupling required at package pins to maintain switching noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes PCB routing complexity and signal skew by grouping related D and Q signals per section (e.g., pins 3–6 = 1D1–1D4; pins 19–22 = 1Q1–1Q4). |
| 3-state output drivers | Enable bidirectional data flow on shared buses without external transceivers - OE-controlled high-Z state eliminates bus contention. |
| Asynchronous clear | Allows immediate reset of register contents without waiting for next clock edge - critical for deterministic startup and error recovery. |
| TTL-compatible interface | VIH = 2.0 V min, VIL = 0.8 V max ensures robust noise margin against legacy TTL and LS logic families. |
| ALS process technology | Reduces power consumption by ~50% versus standard LS while maintaining comparable speed - improves thermal density in dense PCB layouts. |
Applications
| Industrial PLC I/O Module | Legacy Test Equipment Data Capture |
|---|---|
|
Use Scenario: Capturing parallel sensor or actuator status bits in programmable logic controller backplanes with strict timing alignment. IC Role / Device Role / Timing Role: Dual 4-bit register storing real-time I/O states on each CLK edge; CLR synchronizes to system reset; OE isolates bus during configuration. Use Value: Enables deterministic 30 MHz sampling of 8-bit parallel I/O channels with guaranteed setup/hold margins and no external buffering. |
Use Scenario: Latching measurement results from analog-to-digital converters or digital pattern generators before serial upload to host PC. IC Role / Device Role / Timing Role: Edge-triggered storage element capturing 8-bit result words; 3-state outputs allow multiplexing onto shared test bus under microcontroller control. Use Value: Eliminates need for discrete latch + buffer combinations - reduces component count and board space in compact benchtop instruments. |
| Backplane Data Buffer | Embedded Control Panel Interface |
|
Use Scenario: Isolating and regenerating parallel address/data signals between CPU and peripheral cards in modular rack systems. IC Role / Device Role / Timing Role: Bus driver with registered inputs - provides clean, skew-minimized signals while absorbing capacitive loading of long backplane traces. Use Value: Supports reliable 30 MHz operation over 15 cm backplane runs with 24 mA drive strength, reducing signal integrity risk. |
Use Scenario: Interfacing keypad scan matrix or LED display drivers to an 8-bit microcontroller with limited I/O pins. IC Role / Device Role / Timing Role: Parallel I/O expander - stores keypress states or display segment data; OE allows microcontroller to read/write shared bus without conflict. Use Value: Provides eight additional synchronized I/O bits using only three MCU control lines (CLK, OE, CLR), simplifying firmware polling logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit registered bus driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS876ANS | Inverting Q outputs; preset (PRE) instead of clear (CLR); identical pinout and timing. | Requires inverted logic interpretation in data path; PRE active-low sets outputs low, not resets stored state. | Select when system design requires active-low assertion of known output state independent of clock, rather than full register reset. |
| SN74AS874NS | Faster 125 MHz max clock; higher drive (48 mA sink); AS family, not ALS - increased power (ICC ≈ 133 mA vs. 32 mA). | Supports higher-speed data acquisition but demands stricter decoupling and thermal management. | Choose for performance-critical paths where speed outweighs power budget constraints and board layout supports AS-level noise immunity. |
Compared with SN74ALS874BNS, SN74ALS876ANS offers functional inversion and preset control at identical speed/power, while SN74AS874NS delivers 4× clock rate at 4× static current - making SN74ALS874BNS optimal for cost- and power-sensitive 30 MHz bus interfaces where ALS compatibility is required.
Availability
SN74ALS874BNS is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy test equipment data capture, and backplane data buffer applications requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ALS874BNS 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.
The SN74ALS874BNS belongs to TI's legacy ALS logic family, engineered for high-speed, low-power bus interfacing in industrial control and instrumentation systems where reliability and TTL compatibility are essential.
FAQ
What is the maximum clock frequency supported by the SN74ALS874BNS?
The SN74ALS874BNS supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C, CL = 50 pF). This rating is verified by TI's switching characteristics table and ensures reliable edge-triggered data capture without setup/hold violations in synchronous bus applications.
Does the SN74ALS874BNS have true or inverting outputs?
The SN74ALS874BNS has true (noninverting) Q outputs, as confirmed by the function table and logic diagram in the SDAS061C datasheet. When CLR is high and OE is low, Qn follows Dn on the rising edge of CLK - distinguishing it from the inverting SN74ALS876A variant.
What package types are available for the SN74ALS874BNS?
The SN74ALS874BNS is offered in the 24-pin plastic small-outline (SOIC) DW package, with RoHS-compliant CU NIPDAU finish and moisture sensitivity level (MSL) 1. TI also lists NT (plastic DIP) variants, but SN74ALS874BNS specifically refers to the DW package per TI's orderable device nomenclature.
How does the asynchronous clear (CLR) function operate in the SN74ALS874BNS?
In the SN74ALS874BNS, asserting CLR low asynchronously forces the corresponding Q1–Q4 outputs to logic low, regardless of CLK state or data inputs. This function is independent per section (1CLR controls first 4-bit group; 2CLR controls second), enabling selective or full register reset without clock dependency.
Can the SN74ALS874BNS drive standard TTL loads directly?
Yes, the SN74ALS874BNS can drive standard TTL loads directly: its 24 mA output sink current (IOL) exceeds the 1.6 mA per input required for 15 standard TTL loads, and its 2.6 mA source current (IOH) meets TTL high-level drive requirements. No external buffer is needed for typical bus fanout scenarios.
SN74ALS874BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ALS874BNS FAQ
1.How can I place an order for SN74ALS874BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS874BNS 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 SN74ALS874BNS reliable?
The price and inventory of SN74ALS874BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS874BNS is usually 5 days.
3.What payment methods are accepted for SN74ALS874BNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS874BNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS874BNS?
SN74ALS874BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS874BNS 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 SN74ALS874BNS?
For technical support, including SN74ALS874BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS874BNS requirements.
6.How does Aetrix verify that SN74ALS874BNS is sourced from the original manufacturer or authorized distributors?
All SN74ALS874BNS 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 SN74ALS874BNS meets industry standards.
7.What is the process for return or replacement of SN74ALS874BNS?
All SN74ALS874BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS874BNS, 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 SN74ALS874BNS part is unused and in its original packaging.
Return procedure for SN74ALS874BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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