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Texas Instruments SN74AC374N
- Part No.:
- SN74AC374N
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74AC374N.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,282
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Product details
Overview
SN74AC374N from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, operating across 2V–6V VCC, featuring 9.5ns max propagation delay at 5V and designed for bus-oriented digital systems including I/O port buffering and bidirectional data routing in industrial control and instrumentation interfaces.
For engineers reviewing the SN74AC374N datasheet, SN74AC374N pinout, SN74AC374N application, or SN74AC374N equivalent, this device supports high-speed parallel data latching with independent output-enable control, wide supply voltage tolerance, and direct capacitive bus driving capability - critical for legacy TTL-compatible upgrades and mixed-voltage logic interfacing.
Technical Context
This device implements eight synchronous D-type flip-flops triggered on the positive clock edge, each retaining input data (D1–D8) at Q1–Q8 outputs upon CLK↑. A dedicated active-low OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal latch operation or data retention.
It operates over −40°C to +85°C with full 2V–6V VCC support, accepts inputs up to 6V regardless of supply, and delivers ±24mA output drive at 5V - enabling robust interfacing between 3.3V logic and 5V buses while maintaining noise margins and timing integrity in multi-load environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system integration and backward compatibility with 5V TTL and 3.3V CMOS domains. |
| Max tpd | 9.5ns at 5V - enables reliable operation up to 100MHz clock frequency in synchronous bus applications. |
| IOH/IOL | ±24mA at 5V - drives standard 50pF loads directly without external buffers, reducing component count in bus driver designs. |
| tsu/th | 4.5ns setup / 1.5ns hold at 5V - tight timing window allows precise synchronization in high-speed parallel data capture. |
| Input Voltage Tolerance | Up to 6V - permits interfacing with higher-voltage peripherals without level-shifting circuitry. |
| 3-State Output Enable | Active-low OE pin - provides simultaneous high-impedance control for all eight outputs, essential for shared-bus arbitration. |
Pinout & Package
SN74AC374N uses a 20-pin plastic dual in-line package (PDIP-N), body size 24.33mm × 6.35mm, with through-hole mounting and industry-standard pin spacing (2.54mm). Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-low control: asserts high-impedance on all Q outputs when high; does not affect internal latch state. |
| 2–9, 12, 15–19 (Q1–Q8) | Noninverting 3-state outputs | Drive bus lines directly; high-impedance when OE = high, eliminating need for external pull-ups or bus contention logic. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | Sampled on rising CLK edge; accept voltages up to 6V independent of VCC, simplifying mixed-supply interface design. |
| 11 (CLK) | Clock input | Positive-edge-triggered; synchronizes all eight D-to-Q transfers simultaneously with minimal skew. |
| 10 (GND) | Ground reference | Primary return path for logic and output currents; requires low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Power supply | Supports 2V–6V operation; bypass capacitor (0.1µF ceramic) required adjacent to pin for stable switching performance. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2V–6V) | Enables single-component support for both 3.3V and 5V system domains without redesign or voltage translation. |
| 3-state noninverting outputs | Eliminates bus contention in multi-driver configurations; allows direct connection to shared data/address buses without external isolation. |
| 9.5ns max tpd at 5V | Supports 100MHz clock rates in synchronous latch applications, meeting timing budgets for industrial PLC I/O modules and test equipment. |
| Input tolerance to 6V | Permits direct connection to 5V-tolerant microcontroller GPIOs or legacy peripherals without level shifters or clamping diodes. |
| Full parallel access architecture | Allows simultaneous loading of all eight bits via common CLK and OE, optimizing throughput in parallel data acquisition and display drivers. |
Applications
| Industrial I/O Expansion | Legacy System Bus Interface |
|---|---|
|
Use Scenario: Adding parallel digital I/O capability to a microcontroller-based programmable logic controller (PLC) rack module. IC Role / Device Role / Timing Role: Latches 8-bit sensor or actuator data on rising CLK edge; OE enables/disables bus connection during read/write cycles. Use Value: Provides deterministic 9.5ns propagation delay and ±24mA drive strength to directly control relays, LEDs, or optocouplers without buffer ICs. |
Use Scenario: Interfacing a modern 3.3V FPGA to a legacy 5V ISA bus for retro-computing hardware emulation. IC Role / Device Role / Timing Role: Acts as bi-directional level-translating latch: accepts 3.3V FPGA outputs, presents 5V-compatible signals to ISA, and isolates bus during FPGA reconfiguration. Use Value: Input tolerance to 6V and 2V–6V VCC operation eliminate external level shifters while maintaining timing compliance with ISA's 8MHz clock requirement. |
| Test Equipment Data Capture | Digital Audio Signal Routing |
|
Use Scenario: Capturing parallel digital waveform samples from high-speed ADCs in automated test equipment (ATE). IC Role / Device Role / Timing Role: Synchronizes 8-bit sample words on CLK↑; OE gates captured data onto shared backplane bus only during valid transfer windows. Use Value: 4.5ns setup time and 1.5ns hold time ensure reliable sampling at 100MHz, while 3-state outputs prevent bus contention during idle periods. |
Use Scenario: Routing parallel digital audio data (e.g., I²S channel pairs) between DSP cores and DACs in professional audio mixers. IC Role / Device Role / Timing Role: Buffers and isolates 8-bit audio word lanes; OE enables dynamic channel muting by disconnecting DAC inputs without disrupting DSP timing. Use Value: Noninverting 3-state outputs preserve signal polarity and reduce jitter accumulation; ±24mA drive ensures clean edges into multiple DAC inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT374N | Higher drive (±24mA vs ±24mA same), but tighter VCC range (4.5V–5.5V); faster tpd (7.5ns @ 5V). | Requires strict 5V supply; unsuitable for 3.3V or mixed-voltage systems where SN74AC374N operates natively. | Select SN74ACT374N only when 5V-only operation and sub-8ns timing are mandatory; otherwise SN74AC374N offers broader supply flexibility. |
| 74LVC374APW | Lower VCC range (1.65V–3.6V); 3.3V-only compatible; smaller TSSOP-20 package (6.5mm × 4.4mm). | Not 5V-tolerant; cannot interface directly with 5V buses without external level translation. | Choose 74LVC374APW for space-constrained 3.3V-only designs; SN74AC374N remains preferred for 5V legacy compatibility and through-hole assembly. |
Compared with SN74ACT374N and 74LVC374APW, SN74AC374N uniquely balances 2V–6V operation, 5V bus compatibility, PDIP packaging for prototyping, and proven reliability in industrial temperature ranges - making it the optimal choice for mixed-voltage upgrades and long-lifecycle embedded systems.
Availability
SN74AC374N is available at Aetrix Electronics and suitable for industrial I/O expansion, legacy bus interfacing, and test equipment data capture requiring stable component supply and long-term obsolescence management.
Supply support for SN74AC374N 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 and embedded processing technologies, with decades of experience delivering high-reliability logic and interface solutions for industrial, automotive, and communications markets.
SN74AC374N belongs to TI's AC-series advanced CMOS logic family, engineered for high-speed, low-power, and wide-supply-voltage operation in demanding real-world digital systems - particularly where interoperability across voltage domains is critical.
FAQ
What is the maximum clock frequency supported by SN74AC374N?
SN74AC374N supports up to 100MHz clock frequency at VCC = 5V ± 0.5V under recommended operating conditions. This is derived from its 4.5ns minimum pulse width (tw) and verified timing characteristics in Section 4.6 of the official datasheet. The SN74AC374N maintains reliable setup/hold timing margins even at this rate, making it suitable for high-throughput parallel data latching in industrial controllers and test instrumentation.
Does SN74AC374N require external pull-up resistors on the OE pin?
Yes - for defined high-impedance state during power-up or power-down, OE must be tied to VCC via a pullup resistor per TI's guidance in Section 6.1. The SN74AC374N does not include internal pullups on OE, so an external resistor (value determined by driver sink capability) ensures outputs remain tri-stated until firmware initializes the control line. This prevents bus contention during system reset sequences.
Can SN74AC374N operate reliably at 3.3V VCC?
Yes - SN74AC374N is fully specified for 3.3V operation (VCC = 3.3V ± 0.3V), delivering 60MHz maximum clock frequency, 13.5ns max tPLH, and guaranteed 3.15V VIH threshold. Its 2V–6V range makes SN74AC374N ideal for mixed-voltage systems where 3.3V logic interfaces with 5V peripherals without level shifters, preserving signal integrity and timing predictability.
What is the thermal resistance (RθJA) of SN74AC374N in its PDIP package?
The junction-to-ambient thermal resistance RθJA for SN74AC374N in the 20-pin PDIP (N) package is 69°C/W, as documented in Section 4.3 of the datasheet. This value reflects standard JEDEC test board conditions and confirms adequate thermal performance for typical industrial ambient temperatures (−40°C to +85°C) without forced airflow or heatsinking in most PCB layouts.
How does the 3-state output behavior of SN74AC374N differ from open-drain outputs?
SN74AC374N features true 3-state (high-impedance) outputs - not open-drain - meaning each Q pin can actively drive high or low when enabled, and presents >100kΩ impedance when disabled. Unlike open-drain, no external pull-up is needed for logic-high states, and bus contention is avoided solely via OE control. This behavior is intrinsic to the SN74AC374N's internal output stage architecture and confirmed in its functional block diagram and timing waveforms.
SN74AC374N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 155 MHz
- Max Propagation Delay @ V, Max CL:
- 9.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74AC374N FAQ
1.How can I place an order for SN74AC374N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC374N 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 SN74AC374N reliable?
The price and inventory of SN74AC374N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374N is usually 5 days.
3.What payment methods are accepted for SN74AC374N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC374N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC374N?
SN74AC374N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC374N 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 SN74AC374N?
For technical support, including SN74AC374N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374N requirements.
6.How does Aetrix verify that SN74AC374N is sourced from the original manufacturer or authorized distributors?
All SN74AC374N 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 SN74AC374N meets industry standards.
7.What is the process for return or replacement of SN74AC374N?
All SN74AC374N units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374N, 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 SN74AC374N part is unused and in its original packaging.
Return procedure for SN74AC374N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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