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Texas Instruments SN74ALS74ANS
- Part No.:
- SN74ALS74ANS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALS74ANS.pdf
- Description:
- D FLIP-FLOP, ALS SERIES, 2-FUNC,
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
SN74ALS74ANS from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent preset and clear inputs, operating at 5 V nominal supply, delivering 34 MHz maximum clock frequency (CL = 50 pF), 6 mW typical power dissipation per flip-flop, and 18 ns maximum propagation delay (tPLH/tPHL) across 0°C to 70°C ambient. It serves as a synchronous storage element in TTL-level digital control logic, data latching, and state-machine sequencing.
For engineers reviewing the SN74ALS74ANS datasheet, SN74ALS74ANS pinout, SN74ALS74ANS application, or SN74ALS74ANS equivalent, this device is selected for low-power, medium-speed edge-triggered storage where TTL-compatible input thresholds, guaranteed setup/hold timing (tsu = 15 ns, th = 0 ns), and dual independent flip-flop functionality are required in industrial control and legacy digital systems.
Technical Context
This device implements two identical, electrically isolated D-type latches triggered on the rising voltage threshold of CLK-not its edge rate-enabling robust operation with slow-rising clocks. Each section features asynchronous active-low PRE and CLR inputs that override clocked data transfer, supporting immediate state initialization or reset without clock dependency.
It belongs to the Advanced Schottky (ALS) logic family, optimized for speed-power trade-off over standard TTL: 50 MHz typical clock frequency and 6 mW per flip-flop at 5 V, with VIH = 2 V, VIL = 0.8 V, VOH ≥ VCC–2 V, and VOL ≤ 0.4 V at IOL = 8 mA-ensuring reliable interfacing with legacy 74LS and 74S devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | Advanced Schottky TTL (ALS), ensuring backward compatibility with 74LS while improving speed and reducing power vs standard TTL |
| Supply Voltage Range | 4.5 V to 5.5 V - supports stable operation under ±10% rail variation common in industrial 5 V supplies |
| Max Clock Frequency | 34 MHz at CL = 50 pF - enables use in medium-speed synchronous logic up to ~29 ns minimum clock period |
| Propagation Delay | 18 ns max (CLK→Q) - defines worst-case timing budget for critical path analysis in sequential logic design |
| Input Thresholds | VIH = 2 V min, VIL = 0.8 V max - guarantees clean recognition of TTL-level logic states from upstream drivers |
| Output Drive | IOH = –0.4 mA, IOL = 8 mA - supports fan-out of ≥10 LS-TTL loads or direct driving of small capacitive buses |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems, instrumentation, and non-automotive industrial equipment |
Pinout & Package
SN74ALS74ANS uses a 14-pin plastic dual in-line package (PDIP-N), 300-mil body width, with through-hole mounting and industry-standard pin spacing (0.1" pitch). Pin 1 is top-left corner marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CLR | Active-low asynchronous clear for first flip-flop - forces Q1 = 0, Q1̅ = 1 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 - triggers transfer only on voltage-threshold crossing (not edge slope) |
| 4 | 1PRE | Active-low asynchronous preset for first flip-flop - forces Q1 = 1, Q1̅ = 0 regardless of clock or data |
| 5 | 1Q | True output of first flip-flop - reflects stored D value after CLK↑, unless overridden by PRE/CLR |
| 6 | 1Q̅ | Inverted output of first flip-flop - complementary to 1Q, usable for feedback or differential signaling |
| 7 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance connection to minimize noise coupling |
| 8 | VCC | +5 V supply pin - requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin |
| 9 | 2CLR | Active-low asynchronous clear for second flip-flop - independent of first section's control signals |
| 10 | 2D | Data input for second flip-flop - electrically isolated from 1D; enables dual-channel parallel storage |
| 11 | 2CLK | Clock input for second flip-flop - may share CLK with first section or operate independently |
| 12 | 2PRE | Active-low asynchronous preset for second flip-flop - fully independent of 1PRE and other controls |
| 13 | 2Q | True output of second flip-flop - synchronized to 2CLK, unaffected by 1CLK or 1Q transitions |
| 14 | 2Q̅ | Inverted output of second flip-flop - provides logical complement without external inverter |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of 2-bit registers, toggle dividers, or paired control flags without inter-section timing constraints |
| Asynchronous preset/clear | Allows immediate state initialization or fault recovery without waiting for clock edge - critical for power-up sequencing and error handling |
| TTL-compatible input thresholds | VIH = 2 V / VIL = 0.8 V ensures interoperability with 74LS, 74S, and microcontroller GPIOs without level-shifting |
| Low-power ALS architecture | 6 mW per flip-flop at 5 V reduces thermal load and supply current in multi-device logic arrays |
| No hold-time requirement on D input | th = 0 ns allows data to change immediately after CLK↑ - simplifies timing closure in high-fanout or routed-data paths |
Applications
| Industrial Control Sequencing | Legacy System Data Latching |
|---|---|
|
Use Scenario: Storing sensor status bits or actuator enable states in programmable logic controllers (PLCs) with discrete I/O modules. IC Role / Device Role / Timing Role: Dual D-flip-flop providing synchronized, edge-triggered capture of parallel status lines under system clock control. Use Value: Ensures deterministic sampling of noisy industrial signals using asynchronous clear for emergency stop resets and preset for known startup states. |
Use Scenario: Capturing address/data bus values during memory read/write cycles in vintage computer peripherals and test equipment. IC Role / Device Role / Timing Role: Synchronous latch holding transient bus data until CPU acknowledges transfer completion. Use Value: 18 ns max tpd and 15 ns setup time meet tight timing windows of 8-bit microprocessor buses (e.g., Z80, 8085) without added wait states. |
| Digital Counter State Storage | Power-Up Initialization Logic |
|
Use Scenario: Holding current count state in divide-by-N or modulo counters used in frequency synthesis and timing generators. IC Role / Device Role / Timing Role: Edge-triggered storage element preserving counter value between clock edges with glitch-free outputs. Use Value: Complementary Q/Q̅ outputs eliminate need for external inverters in ripple-carry or Johnson counter topologies. |
Use Scenario: Establishing default configuration bits (e.g., mode select, calibration flags) at system power-on before firmware execution. IC Role / Device Role / Timing Role: Asynchronous preset/clear inputs driven by RC-reset network to force known initial state on all outputs. Use Value: Eliminates reliance on software initialization; guarantees safe hardware defaults even if firmware fails to load. |
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 |
|---|---|---|---|
| SN74LS74N | Slower (25 MHz max), higher power (8 mW), longer propagation delay (25 ns), same pinout and voltage specs | Acceptable where lower speed suffices and LS-family loading compatibility is required | Choose for cost-sensitive designs already using LS logic; verify timing margins due to +7 ns tpd penalty |
| SN74AS74AN | Faster (105 MHz max), higher power (16 mA ICC), tighter timing (tsu = 4.5 ns, tpd = 8 ns), same package | Suitable for high-speed clock domain bridging but increases supply current and noise sensitivity | Choose only when >34 MHz operation is mandatory; requires stricter layout controls for signal integrity |
Compared with SN74ALS74ANS, SN74LS74N trades speed for broader legacy compatibility and lower cost, while SN74AS74AN delivers 3× clock throughput at the expense of doubled supply current and reduced noise margin - making SN74ALS74ANS the optimal balance for 25–34 MHz commercial-grade applications requiring reliability and moderate power.
Availability
SN74ALS74ANS is available at Aetrix Electronics and suitable for industrial control sequencing, legacy system data latching, and digital counter state storage requiring stable component supply, long-term obsolescence management, and verified traceable sourcing.
Supply support for SN74ALS74ANS 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 SN74ALS74ANS belongs to TI's Advanced Schottky TTL logic product line, designed to deliver improved speed-power efficiency over standard TTL for commercial-grade digital systems requiring robust, pin-compatible upgrades from 74LS devices.
FAQ
What is the maximum clock frequency supported by SN74ALS74ANS?
The SN74ALS74ANS supports a maximum clock frequency of 34 MHz under recommended conditions (VCC = 4.5 V to 5.5 V, CL = 50 pF, TA = 0°C to 70°C). This value is measured at the clock input and reflects guaranteed operation across the full commercial temperature range - not a typical or characterization-only figure. The SN74ALS74ANS achieves this performance while maintaining 6 mW typical power per flip-flop, distinguishing it from both slower LS and higher-power AS variants.
Does SN74ALS74ANS require a minimum hold time on the D input?
No, the SN74ALS74ANS specifies a hold time (th) of 0 ns for the D input relative to the CLK rising edge. This means data may change immediately after the clock transition without affecting the captured value - a key timing advantage over many contemporary logic families. This feature simplifies PCB routing and eliminates hold-time constraints in high-fanout or long-trace applications, and is explicitly confirmed in the "recommended operating conditions" table of the SDAS143C datasheet for SN74ALS74A devices.
Can SN74ALS74ANS drive standard TTL loads directly?
Yes, the SN74ALS74ANS can directly drive standard TTL loads: its output drive capability is rated at IOH = –0.4 mA (high-level) and IOL = 8 mA (low-level), meeting or exceeding the input current requirements of 74LS and 74S devices. With VOL ≤ 0.4 V at 8 mA and VOH ≥ VCC–2 V, it maintains valid TTL logic levels across its full operating range - enabling seamless integration into mixed-logic systems without interface buffers.
Is SN74ALS74ANS pin-compatible with SN74LS74N?
Yes, SN74ALS74ANS is pin-compatible with SN74LS74N: both use the 14-pin PDIP-N package with identical pin assignments for VCC, GND, CLK, D, PRE, CLR, Q, and Q̅ for each of the two flip-flops. This allows direct replacement in existing designs to improve speed (from 25 MHz to 34 MHz) and reduce power (from 8 mW to 6 mW per flip-flop), provided board-level timing analysis confirms setup/hold margin improvements.
What is the operating temperature range of SN74ALS74ANS?
The SN74ALS74ANS is characterized for operation from 0°C to 70°C - the commercial temperature grade. This range is explicitly defined in the "recommended operating conditions" table of the SDAS143C datasheet and distinguishes it from the military-grade SN54ALS74A (–55°C to 125°C). Designs targeting extended temperature environments must select the SN54ALS74A variant or verify derating behavior outside this range.
SN74ALS74ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 34 MHz
- Max Propagation Delay @ V, Max CL:
- 18ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 2mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74ALS74ANS FAQ
1.How can I place an order for SN74ALS74ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS74ANS 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 SN74ALS74ANS reliable?
The price and inventory of SN74ALS74ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS74ANS is usually 5 days.
3.What payment methods are accepted for SN74ALS74ANS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS74ANS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS74ANS?
SN74ALS74ANS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS74ANS 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 SN74ALS74ANS?
For technical support, including SN74ALS74ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS74ANS requirements.
6.How does Aetrix verify that SN74ALS74ANS is sourced from the original manufacturer or authorized distributors?
All SN74ALS74ANS 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 SN74ALS74ANS meets industry standards.
7.What is the process for return or replacement of SN74ALS74ANS?
All SN74ALS74ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS74ANS, 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 SN74ALS74ANS part is unused and in its original packaging.
Return procedure for SN74ALS74ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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