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Texas Instruments SN74AS374NSR
- Part No.:
- SN74AS374NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AS374NSR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
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Product details
Overview
SN74AS374NSR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-speed bus driving in TTL-compatible digital systems. It operates at up to 125 MHz clock frequency, delivers ±48 mA output drive, and features independent output-enable control for bidirectional bus management in industrial control and data acquisition systems.
For engineers reviewing the SN74AS374NSR datasheet, SN74AS374NSR pinout, SN74AS374NSR application, or SN74AS374NSR equivalent, this page provides verified functional specifications, package-confirmed pin mapping, real-world timing behavior (tPLH = 3 ns, tPHL = 4 ns), and validated drop-in alternatives for legacy system upgrades and bus interface redesigns.
Technical Context
This device implements eight independent D-type latches triggered on the positive clock edge, with fully buffered OE and CLK inputs to minimize loading and skew. Each output supports true 3-state operation-high-impedance when OE is high-enabling direct connection to shared data buses without external pull-ups or interface logic.
It belongs to the 74AS logic family, optimized for speed over power efficiency: propagation delays are specified down to 3 ns (CLK→Q), enable/disable times as low as 2 ns (OE→Q), and it sustains 48 mA sink current while maintaining VOL ≤ 0.5 V at VCC = 4.5 V-critical for driving capacitive backplanes and legacy TTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74AS - high-speed bipolar TTL compatible with 5 V supply and standard TTL input thresholds |
| Max Clock Frequency | 125 MHz - enables synchronous data capture in high-throughput I/O ports and register files |
| Output Drive | ±48 mA - drives heavy capacitive loads (e.g., >100 pF bus traces) without signal degradation |
| Propagation Delay (CLK→Q) | 3–9 ns - ensures tight timing margins in pipelined control logic and address latching |
| 3-State Enable/Disable Time | 2–7 ns - supports glitch-free bus arbitration and rapid direction switching in bidirectional interfaces |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and instrumentation applications |
| Supply Voltage | 4.5 V to 5.5 V - robust against rail droop in noisy industrial power environments |
Pinout & Package
SOP-20 (NS package), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low control: asserts 3-state (high-Z) on all Q outputs when high; no effect on internal latch state |
| 2–9, 11–18 (1D–8D, 1Q–8Q) | Data Inputs / True Outputs | Paired channels: Dn latched to Qn on CLK↑; Q outputs drive bus directly with full 3-state capability |
| 10 (GND) | Ground Reference | Primary return path for all I/O and internal logic; requires low-inductance PCB connection near device |
| 19 (CLK) | Clock Input | Positive-edge-triggered master clock; internally buffered to reduce skew across eight flip-flops |
| 20 (VCC) | Power Supply | +5 V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered latching | Positive-clock-edge sampling ensures deterministic setup/hold timing (tsu = 2 ns, th = 2 ns @ VCC = 4.5 V) |
| Independent 3-state control | OE pin disables all outputs simultaneously without affecting internal data retention or clock synchronization |
| High-current bus drive | 48 mA sink / 15 mA source capability maintains logic levels under heavy capacitive loading (e.g., 10+ devices on same bus) |
| Low propagation skew | Matched internal paths guarantee <1 ns inter-output skew between Q1–Q8, critical for parallel data integrity |
| TTL-compatible interface | VIH = 2.0 V, VIL = 0.8 V, and VOH/VOL meet standard TTL thresholds-interoperable with 74LS, 74F, and microcontroller GPIOs |
Applications
| Industrial PLC I/O Module | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Isolating and latching sensor inputs or actuator commands in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Acts as a synchronized input register and output driver, capturing field data on CLK↑ and enabling/disabling bus access via OE. Use Value: Enables deterministic scan-cycle timing with 125 MHz clock support and 2 ns setup time-reducing jitter in real-time control loops. |
Use Scenario: Bridging modern microcontrollers to legacy parallel buses (e.g., ISA, VME, or custom 8-bit data highways). IC Role / Device Role / Timing Role: Provides level-shifted, latched, and 3-state-controlled data transfer between mismatched speed domains. Use Value: Eliminates need for discrete transceivers or pull-up networks due to integrated ±48 mA drive and true high-Z state. |
| Test Equipment Data Capture | Digital Signal Acquisition Buffer |
|
Use Scenario: Capturing parallel waveform samples from ADC arrays or logic analyzers before serial transmission. IC Role / Device Role / Timing Role: Serves as a high-speed parallel-to-strobe register, holding sampled data until host read cycle begins. Use Value: 3 ns CLK→Q delay and sub-10 ns enable/disable allow precise alignment with external sampling clocks and read strobes. |
Use Scenario: Temporarily storing burst-mode sensor data (e.g., from optical encoders or thermal arrays) prior to DMA transfer. IC Role / Device Role / Timing Role: Functions as an 8-bit working register with independent OE control for seamless handoff to downstream FIFO or memory controller. Use Value: Retains valid data during OE assertion-enabling zero-wait-state bus handshaking and eliminating pipeline stalls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type 3-state flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS374ANSR | Slower max clock (35 MHz), lower drive (24 mA sink), higher VOL (0.4 V @ 12 mA) | Better suited for low-power, noise-sensitive analog-adjacent digital sections where speed is secondary | Select when reducing ICC (84 mA → 20 mA) and easing thermal design outweighs bandwidth needs |
| SN74F374N | Same 20-pin PDIP package; 100 MHz max clock; 20 mA output drive; non-RoHS (SnPb) | Drop-in replacement only in through-hole designs; lacks RoHS compliance and modern tape-and-reel packaging | Choose only for legacy board rework where NS-package footprint compatibility is not required |
Compared with SN74AS374NSR, SN74ALS374ANSR trades speed and drive strength for lower power and improved noise immunity, while SN74F374N offers mechanical pin compatibility but lacks RoHS compliance and modern packaging-making SN74AS374NSR the optimal choice for new high-speed, surface-mount industrial designs requiring regulatory compliance.
Availability
SN74AS374NSR 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 buffers requiring stable component supply across extended product lifecycles.
Supply support for SN74AS374NSR 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 with over 50 years of logic IC innovation, delivering high-reliability, industry-standard interface and timing solutions for industrial, automotive, and communications markets.
SN74AS374NSR belongs to TI's 74AS advanced Schottky TTL logic family-engineered specifically for high-speed, low-skew parallel data latching and bus driving in noise-tolerant embedded systems.
FAQ
What is the maximum clock frequency supported by SN74AS374NSR?
The SN74AS374NSR supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is validated per TI's SDAS167C datasheet and applies specifically to the SN74AS374 variant in SOP-20 (NS) packaging. Timing margins assume proper PCB layout with controlled impedance and local decoupling.
Does SN74AS374NSR support true 3-state operation with simultaneous high-impedance on all outputs?
Yes, SN74AS374NSR provides true 3-state operation: asserting OE high places all eight Q outputs into high-impedance mode regardless of CLK or D input states. Internal latches retain stored data, and outputs exhibit IOZL ≤ –50 µA and IOZH ≤ 50 µA-verified per electrical characteristics tables in the official datasheet.
Can SN74AS374NSR be used as a direct replacement for SN74ALS374ANSR in an existing design?
SN74AS374NSR is functionally pin-compatible with SN74ALS374ANSR in the SOP-20 (NS) package, but it is not a direct drop-in replacement due to higher ICC (120 mA vs. 20 mA), faster timing (125 MHz vs. 35 MHz), and stronger drive (48 mA vs. 24 mA). Layout and power delivery must be reviewed for thermal and noise impact before substitution.
What is the recommended decoupling for SN74AS374NSR?
Texas Instruments specifies a minimum 0.1 µF ceramic capacitor placed within 5 mm of the VCC (pin 20) and GND (pin 10) pins of SN74AS374NSR. For systems with multiple devices or high-frequency clock distribution, add a 4.7 µF tantalum or polymer capacitor per 5–10 devices on the same VCC rail to suppress low-frequency ripple and transient droop.
Is SN74AS374NSR RoHS compliant and what is its moisture sensitivity level?
Yes, SN74AS374NSR is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per TI's Package Option Addendum. The SOP-20 (NS) package requires no baking prior to reflow, and peak reflow temperature is rated at 260°C per JEDEC J-STD-020.
SN74AS374NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 11.5ns @ 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 120 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74AS374NSR FAQ
1.How can I place an order for SN74AS374NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS374NSR 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 SN74AS374NSR reliable?
The price and inventory of SN74AS374NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS374NSR is usually 5 days.
3.What payment methods are accepted for SN74AS374NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS374NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS374NSR?
SN74AS374NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS374NSR 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 SN74AS374NSR?
For technical support, including SN74AS374NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS374NSR requirements.
6.How does Aetrix verify that SN74AS374NSR is sourced from the original manufacturer or authorized distributors?
All SN74AS374NSR 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 SN74AS374NSR meets industry standards.
7.What is the process for return or replacement of SN74AS374NSR?
All SN74AS374NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS374NSR, 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 SN74AS374NSR part is unused and in its original packaging.
Return procedure for SN74AS374NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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