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Texas Instruments SN74AS874DWRG4
- Part No.:
- SN74AS874DWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS874DWRG4.pdf
- Description:
- IC FF D-TYPE DUAL 4BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
SN74AS874DWRG4 from Texas Instruments is a dual 4-bit D-type edge-triggered flip-flop with 3-state noninverting outputs, designed as a bus-oriented register driver. It features asynchronous clear (CLR), true logic outputs, 125 MHz max clock frequency, 48 mA sink output current, and operates from 4.5 V to 5.5 V over 0°C to 70°C - used in high-speed bidirectional bus interfaces and I/O port buffering.
For engineers reviewing the SN74AS874DWRG4 datasheet, SN74AS874DWRG4 pinout, SN74AS874DWRG4 application, or SN74AS874DWRG4 equivalent, key selection considerations include its 24-pin SOIC (DW) package, 3-state bus-driving capability, edge-triggered D-flip-flop architecture with independent clear control per section, and compatibility with TTL-level signaling in legacy industrial control and data acquisition systems.
Technical Context
This device implements two independent 4-bit D-type registers, each with separate clock (CLK), clear (CLR), and output-enable (OE) inputs. Data is latched on the low-to-high transition of CLK; CLR asynchronously resets Q outputs to low regardless of clock state.
All eight outputs are 3-state capable, enabling direct connection to shared data buses. The 3-state control via OE supports bidirectional bus operation when paired with complementary devices, and the bus-structured pinout minimizes trace skew in parallel data paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Dual 4-bit edge-triggered D flip-flop with noninverting 3-state outputs |
| Max Clock Frequency | 125 MHz - enables high-throughput register staging in fast synchronous buses |
| Output Drive Strength | 48 mA sink (IOL), −15 mA source (IOH) - sufficient for driving multiple TTL loads or stubbed backplanes |
| Propagation Delay | tPLH/tPHL ≤ 8.5 ns (CLK to Q) - supports tight timing margins in 10–12 ns cycle designs |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS mixed-signal systems |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and test equipment applications |
| 3-State Enable Delay | tPZH/tPHZ ≤ 7 ns (OE to Q) - ensures minimal bus contention during direction switching |
Pinout & Package
SN74AS874DWRG4 is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), 300-mil width, with gull-wing leads and RoHS-compliant NiPdAu finish. Moisture sensitivity level is Level-1 (unlimited floor life at <30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLR, 2CLR | Asynchronous clear input (active-low) | Resets corresponding 4-bit register's Q outputs to low independently of clock; overrides all other inputs |
| 1OE, 2OE | Output enable input (active-low) | Controls 3-state output drivers for respective 4-bit sections; high = high-impedance state |
| 1CLK, 2CLK | Clock input | Edge-sensitive; data latched on low-to-high transition; both sections share no internal synchronization |
| 1D1–1D4, 2D1–2D4 | Data inputs | Parallel 4-bit data inputs per register section; sampled synchronously with respective CLK |
| 1Q1–1Q4, 2Q1–2Q4 | Noninverting registered outputs | True outputs reflecting latched D values when OE is active; high-impedance when OE is inactive |
| VCC, GND | Power supply terminals | Single 5 V supply; decoupling required within 1 cm of pins 12 (GND) and 24 (VCC) for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Bus-structured pinout | Minimizes PCB routing congestion and signal skew across 8-bit parallel paths |
| 3-state buffer-type outputs | Enables direct connection to shared data buses without external transceivers or isolation logic |
| Asynchronous clear per section | Allows independent reset of either 4-bit register without affecting the other or requiring clock sequencing |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable interfacing with legacy 5 V logic families |
| High-speed 3-state enable/disable | tPHZ/tPLZ ≤ 7.5 ns - reduces bus turnaround time in bidirectional communication protocols |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding isolated digital input/output capability to programmable logic controller racks using parallel backplane buses. IC Role / Device Role: Dual 4-bit register buffers that latch sensor/actuator data and drive bus lines under microcontroller command. Use Value: Enables deterministic sampling and synchronized output updates at up to 125 MHz, reducing scan cycle latency in real-time control loops. |
Use Scenario: Bridging ISA or VMEbus peripherals to modern embedded controllers lacking native 5 V TTL parallel ports. IC Role / Device Role: Bidirectional bus driver and data latch for address/data multiplexing and handshaking signal conditioning. Use Value: Provides 48 mA sink strength and sub-10 ns propagation delay to meet strict timing budgets of legacy bus arbitration cycles. |
| Test Equipment Pattern Generator | Avionics Data Acquisition Module |
|
Use Scenario: Generating precise, synchronized multi-bit stimulus waveforms for IC functional testing and boundary-scan validation. IC Role / Device Role: High-speed parallel register staging element that holds pattern words before launching onto DUT interface buses. Use Value: Delivers 125 MHz clock tolerance and 4 ns setup/hold margins, supporting >80 Mbps parallel vector rates with deterministic timing. |
Use Scenario: Capturing discrete status signals (e.g., landing gear, flap position) in airborne systems with MIL-STD-1553 or ARINC-429 auxiliary buses. IC Role / Device Role: Input register and bus isolator for discrete monitoring channels, preventing fault propagation between subsystems. Use Value: Asynchronous clear allows immediate fault recovery; 3-state outputs prevent bus contention during system reconfiguration events. |
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 |
|---|---|---|---|
| SN74ALS874BDWR | Lower speed (30 MHz max), 24 mA IOL, higher tPLH (14 ns), ALS family propagation characteristics | Suitable for cost-sensitive, lower-frequency industrial control where timing margin is relaxed | Select when power consumption (ICC ≈ 21 mA vs. 133 mA) and thermal budget constrain design more than speed |
| SN74F874N | Bipolar F-series; 100 MHz max, 20 mA IOL, 10 ns tPLH, no RoHS compliance, through-hole PDIP only | Legacy replacement in existing through-hole designs with fixed board layout and no reflow requirements | Choose only for direct drop-in replacement in fielded PDIP-based systems where SOIC rework is prohibited |
Compared with SN74ALS874BDWR and SN74F874N, SN74AS874DWRG4 delivers 4× higher clock rate and 2× stronger drive, making it optimal for new designs demanding high-speed deterministic bus registration - but requires careful attention to power delivery and thermal management due to its 133 mA ICC.
Availability
SN74AS874DWRG4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, and test equipment pattern generators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AS874DWRG4 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 90 years of innovation in industrial, automotive, and communications markets.
SN74AS874DWRG4 belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, low-skew register and bus interface applications in mission-critical industrial and test systems.
FAQ
What is the maximum clock frequency supported by SN74AS874DWRG4?
The SN74AS874DWRG4 supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF). This specification is validated across the full commercial temperature range (0°C to 70°C) and reflects guaranteed timing performance for edge-triggered data capture in high-speed synchronous systems.
Does SN74AS874DWRG4 have inverting or noninverting outputs?
SN74AS874DWRG4 has noninverting Q outputs. This is explicitly confirmed in the datasheet: "SN74AS874 has true outputs" and "SN74AS874 has clear (CLR) inputs and noninverting Q outputs." Each of the eight outputs (1Q1–1Q4, 2Q1–2Q4) reproduces the latched D-input value without inversion.
What package type and lead finish does SN74AS874DWRG4 use?
SN74AS874DWRG4 is packaged in a 24-pin SOIC (DW) with 300-mil width, RoHS-compliant NiPdAu (nickel-palladium-gold) lead finish, and moisture sensitivity level (MSL) rating of Level-1 (unlimited floor life at ≤30°C/60% RH). The 'G4' suffix denotes TI's green, lead-free, and halogen-free packaging standard.
Can SN74AS874DWRG4 be used in place of SN74ALS874BDWR?
SN74AS874DWRG4 is not a direct pin-compatible or functionally identical replacement for SN74ALS874BDWR. While both share the same DW package and pinout, SN74AS874DWRG4 offers higher speed (125 MHz vs. 30 MHz), stronger drive (48 mA vs. 24 mA), and higher ICC (133 mA vs. 21 mA). System-level timing, power, and thermal validation is required before substitution.
What is the purpose of the OE (output enable) pins on SN74AS874DWRG4?
The OE pins (1OE and 2OE) on SN74AS874DWRG4 control the 3-state output drivers for each 4-bit register section. When OE is low, the corresponding Q outputs actively drive logic levels; when OE is high, those outputs enter high-impedance state - enabling shared bus arbitration, bidirectional data flow, and elimination of external bus transceivers in compact designs.
SN74AS874DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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
SN74AS874DWRG4 FAQ
1.How can I place an order for SN74AS874DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS874DWRG4 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 SN74AS874DWRG4 reliable?
The price and inventory of SN74AS874DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS874DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74AS874DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS874DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS874DWRG4?
SN74AS874DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS874DWRG4 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 SN74AS874DWRG4?
For technical support, including SN74AS874DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS874DWRG4 requirements.
6.How does Aetrix verify that SN74AS874DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS874DWRG4 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 SN74AS874DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS874DWRG4?
All SN74AS874DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS874DWRG4, 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 SN74AS874DWRG4 part is unused and in its original packaging.
Return procedure for SN74AS874DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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