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Texas Instruments SN74AS74ANSR
- Part No.:
- SN74AS74ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS74ANSR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,023
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Product details
Overview
SN74AS74ANSR from Texas Instruments is a dual positive-edge-triggered D-type flip-flop IC operating at 5 V, delivering 105 MHz maximum clock frequency (CL = 50 pF), 16 mA typical ICC, and 20 mA output drive capability. It features independent preset (PRE) and clear (CLR) inputs with asynchronous control, and is rated for 0°C to 70°C industrial operation in a 14-pin SOP (NS) package.
For engineers reviewing the SN74AS74ANSR datasheet, SN74AS74ANSR pinout, SN74AS74ANSR application, or SN74AS74ANSR equivalent, this page provides verified timing parameters, package dimensions, functional truth table behavior, and validated drop-in alternatives for high-speed logic design and synchronous state machine implementation.
Technical Context
The SN74AS74ANSR implements two independent edge-triggered D flip-flops with fully asynchronous active-low PRE and CLR inputs that override clocked data transfer. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and totem-pole outputs support direct interfacing with legacy 5 V logic families.
Propagation delays are tightly specified: tPLH/tPHL from CLK to Q are ≤8 ns/9 ns (max), and setup/hold times are 4.5 ns/0 ns respectively - enabling reliable operation in systems requiring sub-10 ns timing margins at 100 MHz clock rates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V rail without regulation overhead |
| Max Clock Frequency | 105 MHz at CL = 50 pF - supports high-speed counters and pipeline registers |
| Output Drive | IOL = 20 mA / IOH = −2 mA - sufficient to drive multiple TTL loads or short PCB traces |
| Propagation Delay | tPLH/tPHL ≤ 8 ns / 9 ns - enables <10 ns critical path timing in synchronous designs |
| Setup/Hold Time | tsu = 4.5 ns, th = 0 ns - simplifies timing closure with minimal data margin requirements |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments |
| Package | SOP (NS), 14-pin, 1.27 mm pitch - surface-mount compatible with standard reflow profiles (MSL Level-1) |
Pinout & Package
SN74AS74ANSR uses a 14-pin SOP (NS) package - a narrow-body small-outline integrated circuit with 1.27 mm lead pitch, 8.75 mm body width, and 1.75 mm max height. It is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Asynchronous active-low clear for first flip-flop - forces 1Q = L, 1Q̅ = H regardless of clock or data |
| 2 | 1D | Data input for first flip-flop - sampled on rising CLK edge when PRE/CLR inactive |
| 3 | 1CLK | Clock input for first flip-flop - positive-edge triggered; voltage-level sensitive, not slew-rate dependent |
| 4 | 1PRE | Asynchronous active-low preset for first flip-flop - forces 1Q = H, 1Q̅ = L |
| 5 | 1Q | True output of first flip-flop - latched value of 1D at last qualifying CLK↑ |
| 6 | 1Q̅ | Inverted output of first flip-flop - complementary to 1Q |
| 7 | GND | Ground reference - return path for all internal currents and I/O |
| 8 | VCC | Positive supply - must be decoupled locally (0.1 µF ceramic + bulk cap) |
| 9 | 2CLR | Asynchronous active-low clear for second flip-flop |
| 10 | 2D | Data input for second flip-flop |
| 11 | 2CLK | Clock input for second flip-flop - electrically isolated from 1CLK |
| 12 | 2PRE | Asynchronous active-low preset for second flip-flop |
| 13 | 2Q | True output of second flip-flop |
| 14 | 2Q̅ | Inverted output of second flip-flop |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent D flip-flops | Enables compact implementation of 2-bit registers or dual-channel synchronization without external gating |
| Asynchronous PRE/CLR | Allows immediate state initialization or reset independent of clock domain - critical for power-up sequencing and fault recovery |
| 105 MHz max clock rate | Supports high-throughput data capture in test equipment, digital signal routing, and real-time control loops |
| 20 mA sink current | Drives up to 10 standard TTL loads directly - eliminates need for buffer stages in legacy system upgrades |
| 0 ns hold time requirement | Reduces layout sensitivity and simplifies PCB trace length matching for parallel data buses |
Applications
| Test Equipment Digital Logic Analyzer | Industrial PLC Input Synchronization |
|---|---|
Use Scenario: Capturing high-speed digital signals from DUTs with precise timestamp alignment across multiple channels. IC Role / Device Role / Timing Role: Dual D flip-flop used as synchronized sampling latch - one channel captures data, the other captures strobe/valid signal on same clock edge. Use Value: 105 MHz clock tolerance and 0 ns hold time ensure deterministic sampling at >100 MSPS without metastability-induced glitches. | Use Scenario: Debouncing and synchronizing noisy 24 V DC sensor inputs into a 5 V microcontroller-based PLC backplane. IC Role / Device Role / Timing Role: First flip-flop synchronizes raw input; second stage provides clean, glitch-free output using cascaded clocked staging. Use Value: Asynchronous CLR allows hardware-initiated reset on power-up or watchdog timeout, ensuring known initial state before firmware execution. |
| Legacy Bus Interface Adapter | Digital Audio Sample Rate Converter Control |
Use Scenario: Bridging TTL-level address/data bus between vintage microprocessor (e.g., Z80) and modern FPGA controller. IC Role / Device Role / Timing Role: Edge-triggered register holding address latch enable (ALE) or write strobe signals for cycle-accurate bus arbitration. Use Value: 20 mA output drive and TTL-compatible VIH/VIL eliminate level-shifter components, reducing BOM count and board area. | Use Scenario: Managing phase-aligned clock enable signals for multi-stage audio sample rate conversion pipelines. IC Role / Device Role / Timing Role: Dual flip-flop generating precisely timed enable pulses for FIR filter coefficient loading and buffer switching. Use Value: Sub-10 ns propagation delay ensures tight skew control (<2 ns between Q/Q̅ outputs), preserving audio sample integrity during resampling transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS74ADR | SOIC (D) package, identical electrical specs, same 14-pin footprint but wider body (3.91 mm vs NS's 3.90 mm); MSL Level-1, 2500/reel | Preferred for automated pick-and-place with larger land patterns; slightly higher thermal resistance than NS | Select SN74AS74ADR if board layout uses SOIC-D footprints or requires higher volume tape-and-reel packaging |
| SN74ALS74ANSR | Lower speed (34 MHz max), lower power (4 mA ICC), same SOP-NS package and pinout; TTL-compatible but ALS family | Suitable for cost-sensitive, lower-frequency control logic where 100+ MHz timing is unnecessary | Choose SN74ALS74ANSR only when power budget <5 mW per flip-flop is mandatory and clock rates stay below 40 MHz |
Compared with SN74AS74ADR, SN74AS74ANSR offers identical functionality in a narrower SOP package optimized for space-constrained layouts; versus SN74ALS74ANSR, it delivers 3× higher clock rate and 4× stronger output drive - making it the sole choice for demanding high-speed digital interfaces.
Availability
SN74AS74ANSR is available at Aetrix Electronics and suitable for industrial automation controllers, test instrumentation signal acquisition, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS74ANSR 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 high-reliability component development.
The SN74AS74ANSR belongs to TI's 74AS logic family - engineered for high-speed, low-noise 5 V TTL-compatible digital systems requiring robust timing margins and industrial temperature operation.
FAQ
What is the maximum clock frequency supported by SN74AS74ANSR?
The SN74AS74ANSR supports a maximum clock frequency of 105 MHz under recommended conditions (VCC = 4.5–5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is based on characterization data per MIL-STD-833 Class B and is not production tested, but confirmed across TI's qualification lot sampling. The SN74AS74ANSR achieves this performance via advanced bipolar transistor design in the AS family, distinguishing it from slower ALS variants.
Does SN74AS74ANSR require external pull-up resistors on PRE and CLR inputs?
No, SN74AS74ANSR does not require external pull-up resistors on PRE or CLR inputs. These inputs have internally biased TTL-compatible thresholds (VIL = 0.8 V max, VIH = 2 V min) and specified IIL/IIL leakage (−1.8 mA / 40 µA), allowing direct connection to logic-high rails or open-collector drivers. External pull-ups are only needed if driving from high-impedance sources exceeding ±0.5 mA output capability.
Can SN74AS74ANSR operate with a 3.3 V supply?
No, SN74AS74ANSR is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but recommended operating range is strictly 4.5 V to 5.5 V. At 3.3 V, VIH threshold (2 V) exceeds 60% of VCC, violating TTL input compatibility and causing unreliable logic recognition. For 3.3 V systems, consider TI's LVC or AUC logic families instead of SN74AS74ANSR.
What is the meaning of "NS" in SN74AS74ANSR's package designation?
The "NS" in SN74AS74ANSR denotes Texas Instruments' narrow-body small-outline package - a 14-pin SOP variant with 3.90 mm body width, 1.27 mm lead pitch, and 1.75 mm max height. It differs from standard SOIC (D) packages (3.91 mm width) by tighter dimensional tolerances and optimized lead form for fine-pitch placement. The NS package is fully compatible with industry-standard SOP-14 footprints but requires verification of land pattern width per TI's D0014A outline.
How does SN74AS74ANSR handle simultaneous assertion of PRE and CLR?
When both PRE and CLR are low simultaneously, SN74AS74ANSR enters a nonstable state: outputs go to high-impedance-like levels (not guaranteed VOH/VOL), and the final state is undefined upon release. The function table explicitly notes this condition is nonpersistent - outputs do not retain a defined logic level once either PRE or CLR returns high. Designers must avoid concurrent assertion in SN74AS74ANSR systems using external logic or timing constraints to ensure exclusive activation.
SN74AS74ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 105 MHz
- Max Propagation Delay @ V, Max CL:
- 9ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2mA, 20mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 16 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74AS74ANSR FAQ
1.How can I place an order for SN74AS74ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS74ANSR 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 SN74AS74ANSR reliable?
The price and inventory of SN74AS74ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS74ANSR is usually 5 days.
3.What payment methods are accepted for SN74AS74ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS74ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS74ANSR?
SN74AS74ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS74ANSR 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 SN74AS74ANSR?
For technical support, including SN74AS74ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS74ANSR requirements.
6.How does Aetrix verify that SN74AS74ANSR is sourced from the original manufacturer or authorized distributors?
All SN74AS74ANSR 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 SN74AS74ANSR meets industry standards.
7.What is the process for return or replacement of SN74AS74ANSR?
All SN74AS74ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS74ANSR, 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 SN74AS74ANSR part is unused and in its original packaging.
Return procedure for SN74AS74ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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