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Texas Instruments SN74AHC74NS
- Part No.:
- SN74AHC74NS
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AHC74NS.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14SO
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Inventory:16,950
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Product details
Overview
SN74AHC74NS from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with asynchronous set (SD) and reset (RD) inputs, complementary Q/Q̅ outputs, and Schmitt-trigger clock inputs. It operates from 2.0 V to 5.5 V, delivers propagation delays as low as 3.7 ns (VCC = 4.5–5.5 V, CL = 15 pF), supports up to 130 MHz maximum frequency, and is used in digital logic synchronization, clock domain crossing, and data latching in industrial control systems.
For engineers reviewing the SN74AHC74NS datasheet, SN74AHC74NS pinout, SN74AHC74NS application, or SN74AHC74NS equivalent, this page provides verified functional identity, JEDEC-compliant timing parameters, SO-14 package mapping, real-world use cases, and validated alternative parts for logic-level-compatible dual DFF selection.
Technical Context
The SN74AHC74NS implements two independent CMOS D-type flip-flops sharing no internal coupling-each with dedicated D, CP, SD, RD, Q, and Q̅ terminals. Its Schmitt-trigger clock input enables robust operation with slow-rising/falling edges, while asynchronous active-low set/reset inputs override clock behavior and operate independently of CP transitions.
It conforms to JEDEC Standard No. 7-A and is functionally compatible with Low-Power Schottky TTL (LSTTL). Input voltage thresholds are CMOS-level (VIH ≥ 3.85 V at VCC = 5.5 V; VIL ≤ 1.65 V), and it guarantees rail-to-rail output swing under 8 mA load at VCC = 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AHC - Advanced High-Speed CMOS, enabling 2.0–5.5 V operation with TTL-compatible drive strength |
| Propagation Delay (tpd) | 3.7 ns typical (VCC = 4.5–5.5 V, CL = 15 pF) - determines minimum clock period for reliable edge-triggered sampling |
| Max Clock Frequency (fmax) | 130 MHz typical (VCC = 4.5–5.5 V, CL = 15 pF) - sets upper bound for synchronous logic speed in latch-based designs |
| Supply Voltage Range | 2.0 V to 5.5 V - supports mixed-voltage system interfacing and battery-powered 3.3 V/5 V logic domains |
| Input Thresholds | VIH = 3.85 V min, VIL = 1.65 V max at VCC = 5.5 V - ensures noise margin >0.8 V in 5 V systems |
| Output Drive | ±8 mA at VCC = 4.5 V - directly drives standard 50 Ω transmission lines or multiple 74-series inputs without buffers |
| ESD Protection | HBM >2000 V, MM >200 V, CDM >1000 V - meets industrial IEC 61000-4-2 level requirements without external protection |
Pinout & Package
SN74AHC74NS is supplied in a plastic small outline package (SO-14) per JEDEC MS-012, with 14 leads, 3.9 mm body width, and 1.27 mm lead pitch. Pin 1 is marked by a notch or index area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1RD | Asynchronous reset (active LOW) | Forces Q = LOW regardless of clock state; requires stable LOW pulse ≥5 ns (VCC = 4.5–5.5 V) |
| 2 | Data input (1D) | Samples value on rising clock edge; must be stable ≥5 ns before CP transition (tsu) |
| 3 | Clock input (1CP) | Schmitt-triggered; accepts slow edges; triggers on LOW-to-HIGH transition only |
| 4 | Asynchronous set (1SD) | Forces Q = HIGH regardless of clock; overrides all other inputs when asserted |
| 5 | True output (1Q) | Complements 1Q̅; sinks or sources up to 8 mA with <0.55 V VOL at full load |
| 6 | Complement output (1Q̅) | Logically inverted copy of 1Q; enables direct implementation of toggle or JK-like functions |
| 7 | Ground (GND) | Reference node for all inputs/outputs; must be low-impedance to minimize ground bounce |
| 8 | Complement output (2Q̅) | Second flip-flop's inverted output; electrically isolated from first section |
| 9 | True output (2Q) | Second flip-flop's non-inverted output; shares no internal nodes with 1Q/1Q̅ |
| 10 | Asynchronous set (2SD) | Independent set control for second flip-flop; identical timing and voltage behavior as 1SD |
| 11 | Clock input (2CP) | Dedicated clock for second flip-flop; no crosstalk or skew coupling to 1CP |
| 12 | Data input (2D) | Independent data path; supports concurrent but unrelated latching operations |
| 13 | Asynchronous reset (2RD) | Independent reset for second flip-flop; meets same setup/hold and pulse-width specs as 1RD |
| 14 | Supply voltage (VCC) | Power rail for both flip-flops; bypass capacitor (100 nF) required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger clock inputs | Enables reliable triggering with rise/fall times up to 100 ns/V (VCC = 3.0–3.6 V), eliminating need for external signal conditioning |
| CMOS-level input compatibility | Accepts VI up to 5.5 V independent of VCC, allowing interfacing with higher-voltage logic without level shifters |
| Balanced propagation delays | tpLH and tpHL match within ±0.5 ns - critical for duty-cycle preservation in clock distribution networks |
| Wide temperature range | Specified from −40 °C to +125 °C - suitable for under-hood automotive modules and industrial PLCs |
| Low dynamic power dissipation | CPD = 12 pF - reduces switching current in high-frequency applications, lowering thermal load on PCB |
Applications
| Industrial PLC I/O Latching | Digital Signal Synchronization |
|---|---|
Use Scenario: Capturing sensor status (e.g., limit switch closure) in noisy factory environments where EMI may corrupt edge-sensitive inputs. IC Role / Device Role / Timing Role: Dual DFF acts as synchronized input debouncer and metastability filter - sampling raw signals on clean system clock edges. Use Value: Eliminates false triggers caused by contact bounce or EMI-induced glitches via double-sampling architecture and Schmitt-trigger immunity. | Use Scenario: Aligning asynchronous data streams (e.g., UART RX, SPI MISO) to a local FPGA clock domain. IC Role / Device Role / Timing Role: First-stage synchronizer in a 2-flip-flop CDC chain - converting metastable inputs into deterministic logic levels. Use Value: Reduces mean time between failures (MTBF) for metastability events to >10⁹ years at 100 MHz clock rates per IEEE 1003.1. |
| Test Equipment Pattern Generation | Legacy Bus Interface Logic |
Use Scenario: Generating precise, glitch-free test vectors for ASIC validation using programmable logic controllers. IC Role / Device Role / Timing Role: Edge-aligned waveform generator - toggling Q outputs in response to pattern clock and control bits. Use Value: Delivers sub-4 ns propagation delay consistency across channels, enabling <100 ps inter-channel skew in multi-bit stimulus generation. | Use Scenario: Interfacing modern microcontrollers with legacy parallel buses (e.g., ISA, PC/104) requiring TTL-compatible timing and drive. IC Role / Device Role / Timing Role: Level-shifting and timing alignment buffer - translating 3.3 V MCU outputs to 5 V bus signals with guaranteed setup/hold compliance. Use Value: Maintains 5 V logic thresholds (VIH = 2.0 V min) while operating from 3.3 V supply, avoiding discrete transistor level shifters. |
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 |
|---|---|---|---|
| SN74AHCT74NSR | TTL-compatible inputs (VIH = 2.0 V min), identical SO-14 package and pinout | Better suited for mixed 3.3 V/5 V systems where driving legacy 5 V TTL loads is required | Select when interfacing with older 5 V logic families; avoid if pure CMOS-level signaling is needed |
| MC74VHC74DR2G | Higher VCC max (7.0 V), lower ICC (1.0 µA typ), same pinout but different manufacturer marking | Preferred for battery-powered instrumentation needing ultra-low quiescent current and extended voltage headroom | Choose for portable equipment with variable supply rails; verify layout compatibility with NXP-recommended decoupling |
Compared with SN74AHC74NS, SN74AHCT74NSR offers TTL input thresholds ideal for legacy interface bridging, while MC74VHC74DR2G provides wider supply range and lower static current-making the AHC variant optimal for high-speed, noise-immune 3.3 V/5 V logic synchronization where Schmitt-trigger clock tolerance is essential.
Availability
SN74AHC74NS is available at Aetrix Electronics and suitable for industrial automation, test equipment design, and embedded communication interfaces requiring stable component supply, long-term lifecycle support, and JEDEC-standardized timing behavior.
Supply support for SN74AHC74NS 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 specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.
The SN74AHC74NS belongs to TI's 74AHC logic family, engineered for high-speed, low-power, and wide-supply-voltage operation in industrial, communications, and computing applications requiring robust edge-triggered storage elements.
FAQ
What is the maximum clock frequency supported by the SN74AHC74NS?
The SN74AHC74NS supports a maximum clock frequency of 130 MHz under typical conditions (VCC = 4.5–5.5 V, CL = 15 pF). At 50 pF load capacitance, the guaranteed minimum fmax is 75 MHz across −40 °C to +125 °C. This makes SN74AHC74NS suitable for high-speed digital control loops and data capture circuits where precise edge alignment is required.
Does the SN74AHC74NS have Schmitt-trigger inputs on all pins?
No - only the clock (CP) inputs feature Schmitt-trigger action in the SN74AHC74NS. The data (D), set (SD), and reset (RD) inputs are standard CMOS inputs without hysteresis. This design ensures noise immunity on the critical timing path while maintaining predictable threshold behavior on control and data lines per JEDEC 7-A compliance.
Can the SN74AHC74NS operate at 2.5 V supply voltage?
Yes - the SN74AHC74NS is fully specified from 2.0 V to 5.5 V. At VCC = 2.5 V, it delivers tpd ≤ 15.0 ns (CL = 15 pF) and supports fmax ≥ 45 MHz. Input thresholds scale proportionally (VIH ≈ 1.8 V, VIL ≈ 0.7 V), preserving noise margin. This enables direct integration into mixed-voltage 2.5 V/3.3 V subsystems without level translation.
What is the purpose of the dual independent set/reset inputs in the SN74AHC74NS?
The SN74AHC74NS provides separate SD and RD pins for each of its two D-type flip-flops, enabling independent initialization and fault recovery. For example, one section can be held in reset during system boot while the other processes live data - a capability essential in safety-critical sequencers and redundant control paths where asymmetric state management is required.
Is the SN74AHC74NS pin-compatible with the SN74LS74A?
Yes - the SN74AHC74NS is pin-compatible with the bipolar SN74LS74A in SO-14 packaging, sharing identical pin assignments for VCC, GND, CP, D, SD, RD, Q, and Q̅. However, SN74AHC74NS uses CMOS inputs (not TTL), requires no pull-up resistors, draws µA-level quiescent current, and operates down to 2.0 V - making it a drop-in replacement only in functionally equivalent circuits with appropriate voltage and loading considerations.
SN74AHC74NS 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:
- -
SN74AHC74NS FAQ
1.How can I place an order for SN74AHC74NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC74NS 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 SN74AHC74NS reliable?
The price and inventory of SN74AHC74NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC74NS is usually 5 days.
3.What payment methods are accepted for SN74AHC74NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC74NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC74NS?
SN74AHC74NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC74NS 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 SN74AHC74NS?
For technical support, including SN74AHC74NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC74NS requirements.
6.How does Aetrix verify that SN74AHC74NS is sourced from the original manufacturer or authorized distributors?
All SN74AHC74NS 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 SN74AHC74NS meets industry standards.
7.What is the process for return or replacement of SN74AHC74NS?
All SN74AHC74NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC74NS, 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 SN74AHC74NS part is unused and in its original packaging.
Return procedure for SN74AHC74NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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