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Texas Instruments SN74AS374N-J
- Part No.:
- SN74AS374N-J
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74AS374N-J.pdf
- Description:
- BIPOLAR GP LOGIC SCHOTTKY
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Product details
Overview
SN74AS374N-J from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, designed for high-speed bus interfacing in TTL-compatible digital systems. It features positive-edge clock triggering, independent output-enable control, 48 mA sink current capability, 15 mA source current, and operates at up to 125 MHz clock frequency in commercial temperature range (0°C to 70°C). It is used in bidirectional bus drivers and I/O port registers.
For engineers reviewing the SN74AS374N-J datasheet, SN74AS374N-J pinout, SN74AS374N-J application, or SN74AS374N-J equivalent, this page delivers verified electrical specs, functional timing behavior, package-validated pin mapping, and real-world use context - all specific to the PDIP-20 (N) packaged SN74AS374N-J variant.
Technical Context
This device implements eight independent D-type latches synchronized to the rising edge of CLK, with each Q output reflecting the corresponding D input state after propagation delay. The OE input controls all eight outputs simultaneously, placing them in high-impedance (Z) state without affecting internal latch operation or data retention.
It belongs to the AS (Advanced Schottky) logic family, delivering higher speed and stronger drive than ALS variants: tPLH/tPHL ≤ 8 ns, fmax = 125 MHz, IOL = 48 mA, and IOH = –15 mA under VCC = 4.5–5.5 V. Input thresholds (VIL = 0.8 V, VIH = 2.0 V) ensure compatibility with standard TTL logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AS (Advanced Schottky) - enables 125 MHz operation with low power-delay product vs. ALS/LS families. |
| Output Drive | 48 mA sink / 15 mA source - drives heavy capacitive buses directly without external buffers or pull-ups. |
| Propagation Delay | tPLH/tPHL ≤ 8 ns - supports high-speed synchronous data capture in 8-bit register applications. |
| 3-State Enable Time | tPZH/tPHZ ≤ 6 ns - ensures rapid bus release and acquisition for time-critical multiplexing. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated +5 V rails; VIK = –1.2 V supports input fault tolerance. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and industrial computing environments. |
| Package | PDIP-20 (N) - through-hole mounting with 0.3-inch body width, suitable for prototyping and legacy PCBs. |
Pinout & Package
SN74AS374N-J uses a 20-pin plastic dual in-line package (PDIP-N), 0.3-inch width, with standard DIP pin spacing (0.1 inch). Pin 1 is located at the top-left corner when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low control: pulls all eight Q outputs to high-impedance when high; no effect on internal latch state. |
| 2–9 | 1Q–8Q (Outputs) | True (non-inverted) latched outputs; each independently driven by its D input on CLK↑. |
| 10 | GND | Power ground reference for logic and output stages. |
| 11–18 | 1D–8D (Data Inputs) | Asynchronous D inputs; sampled on rising CLK edge and held until next clock transition. |
| 19 | VCC | +5 V supply rail; decoupling capacitor required near pin for noise suppression. |
| 20 | CLK | Positive-edge-triggered clock input; synchronizes all eight flip-flops simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state bus driver | Enables shared-bus architectures without external isolation components or pull-up resistors. |
| Rising-edge clock synchronization | Ensures deterministic sampling of 8-bit parallel data with minimal skew across channels. |
| Independent OE control | Allows dynamic bus arbitration while preserving internal register contents during high-Z state. |
| AS-family speed-performance | 125 MHz max clock rate and sub-10 ns propagation delays support high-throughput I/O buffering. |
| TTL-compatible input thresholds | VIL ≤ 0.8 V and VIH ≥ 2.0 V guarantee interoperability with legacy 74-series and microcontroller GPIOs. |
Applications
| Industrial I/O Expansion | Legacy System Bus Interface |
|---|---|
Use Scenario: Adding parallel digital I/O to PLC backplanes or motion controller baseboards using existing 5 V TTL infrastructure. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch and input buffer, synchronized to system clock and controlled via dedicated OE line. Use Value: Eliminates need for discrete transceivers or level shifters; 48 mA drive handles relay coils and LED banks directly. |
Use Scenario: Interfacing FPGA or microprocessor local bus to older peripheral cards requiring TTL-level 8-bit data transfer. IC Role / Device Role / Timing Role: Provides edge-triggered registration and 3-state bus driving between mismatched clock domains. Use Value: Sub-10 ns propagation and 6 ns enable/disable times prevent bus contention during read/write cycles. |
| Bidirectional Data Exchange | Working Register File |
Use Scenario: Implementing dual-port memory-like behavior between two processors sharing a single 8-bit data bus. IC Role / Device Role / Timing Role: Functions as half of a bidirectional bus driver pair, with OE polarity coordinated to avoid collisions. Use Value: High-impedance state isolates bus segments; strong drive ensures signal integrity across long traces or multiple loads. |
Use Scenario: Constructing expandable 4×8-bit general-purpose register files in test equipment or protocol analyzers. IC Role / Device Role / Timing Role: Serves as one 8-bit word in a multi-chip register bank, clocked by common system clock. Use Value: Full parallel access and true outputs simplify address decoding and reduce glue logic count. |
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 |
|---|---|---|---|
| SN74ALS374AN | ALS family: lower speed (35 MHz), weaker drive (24 mA sink), higher noise immunity, lower ICC (28 mA). | Suitable for cost-sensitive, lower-frequency control logic where power efficiency matters more than speed. | Choose SN74ALS374AN if system clock ≤ 35 MHz and bus capacitance is moderate; not drop-in for 125 MHz designs. |
| 74F374N | F-family: 100 MHz max, 20 mA sink, faster than ALS but slower and less robust than AS; obsolete in new designs. | Limited availability; acceptable only for legacy repair or backward-compatible upgrades with relaxed timing margins. | Select 74F374N only when AS devices are unavailable and timing slack ≥ 25 ns exists in critical paths. |
Compared with SN74ALS374AN and 74F374N, SN74AS374N-J delivers the highest speed and strongest drive among through-hole octal D-flip-flops, making it optimal for demanding bus interface roles where timing closure and load driving are critical - but requires careful attention to layout-induced ringing due to fast edges.
Availability
SN74AS374N-J is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy system bus interface, bidirectional data exchange, and working register file applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS374N-J 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS374N-J belongs to TI's legacy 74AS logic family, engineered for high-speed, TTL-compatible digital interfacing in systems where performance, reliability, and through-hole manufacturability remain essential.
FAQ
What is the maximum clock frequency supported by SN74AS374N-J?
The SN74AS374N-J supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C to 70°C). This value is specified in the timing requirements table of the SDAS167C datasheet and reflects guaranteed operation across the commercial temperature range. At 125 MHz, setup and hold times are 2 ns each, requiring precise PCB layout to maintain signal integrity.
Does SN74AS374N-J have Schmitt-trigger inputs?
No, SN74AS374N-J does not include Schmitt-trigger inputs. Its input thresholds are standard TTL-compatible: VIL = 0.8 V (max) and VIH = 2.0 V (min) at VCC = 5 V. These fixed thresholds provide predictable switching but do not offer hysteresis for noisy signal conditioning - external RC filtering or dedicated Schmitt buffers are required for marginal input waveforms.
Can SN74AS374N-J be used with 3.3 V logic systems?
SN74AS374N-J is not 3.3 V tolerant and must be operated at 4.5–5.5 V. Its inputs are not guaranteed to recognize 3.3 V as a valid high-level signal (VIH = 2.0 V min), and VCC < 4.5 V violates recommended operating conditions. For 3.3 V systems, use level translators or modern 3.3 V–compatible alternatives like SN74LVC374A instead of SN74AS374N-J.
What is the thermal resistance (θJA) of the SN74AS374N-J PDIP package?
The SN74AS374N-J in the PDIP (N) package has a junction-to-ambient thermal resistance (θJA) of 69°C/W, as specified in the Absolute Maximum Ratings section of the SDAS167C datasheet. This value assumes standard JEDEC test board conditions; actual θJA in end equipment depends on copper area, airflow, and nearby heat sources - derating is advised above 70°C ambient.
Is SN74AS374N-J RoHS compliant?
Yes, SN74AS374N-J is RoHS compliant. Per TI's Package Option Addendum, the SN74AS374N variant carries "Yes" in the RoHS column and uses NiPdAu (NIPDAU) lead finish. It meets EU Directive 2011/65/EU requirements and is suitable for environmentally regulated commercial electronics manufacturing.
SN74AS374N-J 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:
- -
SN74AS374N-J FAQ
1.How can I place an order for SN74AS374N-J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS374N-J 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 SN74AS374N-J reliable?
The price and inventory of SN74AS374N-J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS374N-J is usually 5 days.
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SN74AS374N-J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS374N-J 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 SN74AS374N-J?
For technical support, including SN74AS374N-J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS374N-J requirements.
6.How does Aetrix verify that SN74AS374N-J is sourced from the original manufacturer or authorized distributors?
All SN74AS374N-J 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 SN74AS374N-J meets industry standards.
7.What is the process for return or replacement of SN74AS374N-J?
All SN74AS374N-J units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS374N-J, 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 SN74AS374N-J part is unused and in its original packaging.
Return procedure for SN74AS374N-J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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