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Texas Instruments SN74AS874DW
- Part No.:
- SN74AS874DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS874DW.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
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Product details
Overview
SN74AS874DW 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 operates at 5 V, supports 125 MHz clock frequency, delivers ±48 mA output drive, and features asynchronous clear (CLR) and output enable (OE) for bidirectional bus control in industrial digital systems.
For engineers reviewing the SN74AS874DW datasheet, SN74AS874DW pinout, SN74AS874DW application, or SN74AS874DW equivalent, this page provides verified functional identity, bus-structured pin mapping, timing-critical parameters (tPLH/tPHL < 8.5 ns), 3-state drive capability, and direct alternatives for legacy TTL bus interface upgrades.
Technical Context
The SN74AS874DW implements two independent 4-bit D-type registers, each triggered on the low-to-high CLK transition. Each register includes dedicated asynchronous CLR and OE inputs, enabling independent reset and bus isolation per 4-bit lane.
Its 3-state outputs support high-drive bus loading (IOL = 48 mA, IOH = −15 mA) with fast enable/disable times (tPHZ ≤ 6 ns, tPLZ ≤ 7.5 ns), and it complies with standard TTL input thresholds (VIH = 2 V, VIL = 0.8 V) while operating across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Dual 4-bit edge-triggered D flip-flop with noninverting 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS systems |
| Max Clock Frequency | 125 MHz - enables high-speed synchronous data latching in bus interfaces |
| Output Drive | 48 mA sink / −15 mA source - drives heavy capacitive bus loads without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns (CLK to Q) - ensures tight timing margins in 10–12 ns cycle designs |
| Enable/Disable Time | tPHZ ≤ 6 ns, tPLZ ≤ 7.5 ns (OE to Q) - minimizes bus contention windows during direction switching |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial embedded control environments |
Pinout & Package
SN74AS874DW uses a 24-pin SOIC (DW) package with bus-structured pinout optimized for PCB layout efficiency in parallel data paths. Pin numbering follows JEDEC MS-013, with dual 4-bit lanes symmetrically arranged around power/ground and control pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13, 24 | 1CLR, 2CLR, VCC | Asynchronous reset for first/second register; main 5 V supply rail |
| 2, 11, 14 | 1OE, 2OE, GND | 3-state output enable for each register; common ground reference |
| 3–6, 7–10 | 1D1–1D4, 2D1–2D4 | Data inputs for two independent 4-bit registers |
| 12, 15–18 | 1CLK, 1Q1–1Q4 | Clock input and noninverting registered outputs for first lane |
| 19–22, 23 | 2Q1–2Q4, 2CLK | Noninverting registered outputs and clock for second lane |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes trace crossing and routing congestion in 8-bit or wider parallel bus layouts |
| True (noninverting) Q outputs | Preserves data polarity across register stage - eliminates need for external inversion logic |
| Asynchronous clear per register | Enables independent initialization of each 4-bit lane without affecting the other |
| 3-state output control (OE) | Allows dynamic bus sharing between multiple SN74AS874DW devices or other peripherals |
| High-current 3-state outputs | Drives up to 48 mA per output - supports termination-resistor-loaded backplanes directly |
Applications
| Industrial PLC I/O Module | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Latching sensor input data and driving actuator command lines in modular programmable logic controller racks. IC Role / Device Role / Timing Role: Dual 4-bit register buffering incoming parallel status bits and outgoing control words synchronized to system clock. Use Value: 125 MHz clock tolerance and 48 mA drive allow direct connection to opto-isolated input banks and relay driver arrays without level-shifting or buffering. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern microcontroller-based host systems via FPGA or CPLD glue logic. IC Role / Device Role / Timing Role: Bus-oriented register holding address/data strobes and handshake signals during burst transfers. Use Value: Bus-structured pinout and matched tPLH/tPHL (≤8.5 ns) simplify timing closure in 33 MHz ISA-compatible designs. |
| Test Equipment Data Capture | Digital Signal Acquisition Board |
|
Use Scenario: Capturing parallel waveform samples from high-speed ADCs or logic analyzers before serial transmission. IC Role / Device Role / Timing Role: Edge-triggered latch capturing 8-bit parallel sample words on rising clock edge with simultaneous 3-state bus release. Use Value: Asynchronous CLR allows deterministic reset prior to acquisition trigger; fast OE disable (tPLZ ≤ 7.5 ns) prevents bus contention during FIFO write cycles. |
Use Scenario: Buffering real-time sensor data streams (e.g., encoder quadrature, thermocouple scan) into an ARM Cortex-M4 DMA channel. IC Role / Device Role / Timing Role: Synchronizing asynchronous external data to internal system clock domain while isolating bus segments during DMA bursts. Use Value: Independent OE/CLR per register enables staggered sampling windows and glitch-free bus arbitration between analog front-end and processor subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS874BDW | Slower max clock (30 MHz), lower drive (24 mA sink), higher propagation delay (tPLH ≤ 14 ns) | Suitable for legacy 8–10 MHz bus systems where power and noise immunity outweigh speed needs | Select when replacing aging ALS parts in cost-sensitive, low-frequency industrial controllers |
| SN74F874N | Same 24-pin PDIP package, 100 MHz max clock, 20 mA output drive, no RoHS compliance | Used in through-hole prototyping or repair of vintage F-series systems; lacks DW package compatibility | Choose only for hand-soldered evaluation or legacy board rework where SOIC footprint is unavailable |
Compared with SN74ALS874BDW and SN74F874N, the SN74AS874DW delivers 4× higher clock rate and 2× stronger output drive in a RoHS-compliant SOIC package - making it the optimal choice for upgrading performance-limited bus interfaces without changing PCB layout.
Availability
SN74AS874DW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, test equipment data capture systems, and digital signal acquisition boards requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS874DW 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 specializing in analog, embedded processing, and logic solutions with over 50 years of industrial-grade component development.
The SN74AS874DW belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, high-drive bus interfacing in industrial control, instrumentation, and legacy system modernization applications.
FAQ
What is the primary function of the SN74AS874DW?
The SN74AS874DW is a dual 4-bit D-type edge-triggered flip-flop with noninverting 3-state outputs, designed specifically as a high-speed bus register driver. Its core function is to latch parallel data on the rising edge of CLK while providing independent asynchronous clear (CLR) and output enable (OE) per register lane - enabling precise timing control and bus isolation in industrial digital systems. The SN74AS874DW supports 125 MHz operation and 48 mA output drive.
Does the SN74AS874DW support true or inverted outputs?
The SN74AS874DW provides true (noninverting) Q outputs, as confirmed by its device designation and functional description in the SDAS061C datasheet. This distinguishes it from the SN74AS876 variant, which offers inverting outputs. The SN74AS874DW's noninverting behavior preserves data polarity across the register stage, eliminating the need for external inverters in most bus-holding applications.
What package type is used for the SN74AS874DW?
The SN74AS874DW is supplied in a 24-pin SOIC (DW) package, per TI's packaging addendum and mechanical drawing MCER004A. This surface-mount package has a 300-mil body width, gull-wing leads, and is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating. The DW package matches the pinout of the obsolete SN74ALS874BDW, enabling drop-in replacement in existing SOIC footprints.
Can the SN74AS874DW be used in place of SN74ALS874BDW?
Yes - the SN74AS874DW is a direct speed- and drive-enhanced replacement for SN74ALS874BDW in the same DW package, sharing identical pinout, voltage ratings, and logic functionality. Key improvements include 4× higher clock frequency (125 MHz vs. 30 MHz), 2× stronger output drive (48 mA vs. 24 mA), and faster propagation delays (≤8.5 ns vs. ≤14 ns). The SN74AS874DW maintains full electrical and mechanical compatibility for drop-in upgrades.
What are the absolute maximum ratings for the SN74AS874DW?
The SN74AS874DW has an absolute maximum supply voltage of 7 V, input voltage limit of 7 V, and operating free-air temperature range of 0°C to 70°C. Storage temperature is rated from −65°C to 150°C. Exceeding these limits may cause permanent damage. These stress ratings do not imply functional operation beyond recommended conditions (VCC = 4.5–5.5 V, TA = 0–70°C), and prolonged exposure to absolute maximums can degrade reliability. The SN74AS874DW must be operated within its recommended conditions for guaranteed performance.
SN74AS874DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 10.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 133 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74AS874DW FAQ
1.How can I place an order for SN74AS874DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS874DW 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 SN74AS874DW reliable?
The price and inventory of SN74AS874DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS874DW is usually 5 days.
3.What payment methods are accepted for SN74AS874DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS874DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS874DW?
SN74AS874DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS874DW 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 SN74AS874DW?
For technical support, including SN74AS874DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS874DW requirements.
6.How does Aetrix verify that SN74AS874DW is sourced from the original manufacturer or authorized distributors?
All SN74AS874DW 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 SN74AS874DW meets industry standards.
7.What is the process for return or replacement of SN74AS874DW?
All SN74AS874DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS874DW, 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 SN74AS874DW part is unused and in its original packaging.
Return procedure for SN74AS874DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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