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Texas Instruments SN74AC374DW
- Part No.:
- SN74AC374DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AC374DW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,819
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Product details
Overview
SN74AC374DW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in digital systems operating from 2V to 6V. It features 9.5ns max propagation delay at 5V, ±24mA output drive capability, and operates across −40°C to +85°C. It is used in I/O port expansion and bidirectional bus driving applications where high-impedance isolation and parallel data capture are required.
For engineers reviewing the SN74AC374DW datasheet, SN74AC374DW pinout, SN74AC374DW application, or SN74AC374DW equivalent, key selection criteria include VCC range (2–6V), tPLH/tPHL timing at 5V (≤9.5ns), 3-state OE control behavior, and SOIC-20 package compatibility with industrial temperature requirements.
Technical Context
The SN74AC374DW implements eight independent D-type flip-flops, each triggered on the positive edge of CLK to latch data from D inputs to Q outputs. Its buffered OE input controls all eight outputs simultaneously, placing them in high-impedance state without affecting internal register operation.
It supports mixed-voltage interfacing: inputs tolerate up to 6V regardless of VCC, enabling connection to higher-voltage logic while powered from 3.3V or 5V. Output drive strength (±24mA at 5V) and low ICC (≤40μA) support robust bus loading and low-static-power system design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables interoperability across 3.3V and 5V logic domains without level shifters. |
| Max tPLH / tPHL | 9.5ns at VCC = 5V - ensures sub-10ns data-to-output timing for high-speed synchronous bus interfaces. |
| Output Drive | ±24mA at VCC = 5V - directly drives standard TTL/CMOS loads and moderately capacitive bus lines (≤50pF). |
| Input Voltage Tolerance | Up to 6V independent of VCC - allows safe interfacing with 5V signals even when VCC = 3.3V. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments. |
| 3-State Enable Delay | tPZH/tPLZ ≤ 9.5ns at 5V - guarantees fast output disable/enable transitions for dynamic bus arbitration. |
| Power Dissipation Cap. | Cpd = 40pF - quantifies dynamic power consumption per toggle; used with frequency to calculate switching power. |
Pinout & Package
SN74AC374DW is housed in a 20-pin SOIC (DW) package measuring 12.80mm × 10.3mm (body: 12.80mm × 7.50mm), with standard 1.27mm pitch and 2.65mm max height. The package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output enable input | Active-low control: pulls all Q outputs to high-Z when high; no effect on internal register state. |
| 2–9, 12, 15–19 (1Q–8Q) | Noninverting 3-state outputs | Drive bus lines directly; high-impedance when OE = high - eliminates need for external pull-ups or bus buffers. |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data inputs | Edge-triggered sampling points; accept voltages up to 6V regardless of VCC setting. |
| 11 (CLK) | Clock input | Positive-edge sensitive; triggers simultaneous capture of all eight D inputs into respective Q outputs. |
| 10 (GND) | Ground reference | Primary return path for all output currents and internal logic; requires low-inductance PCB connection. |
| 20 (VCC) | Supply voltage | Single power rail (2–6V); bypass capacitor (0.1µF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–6V) | Supports direct integration into mixed-supply systems without voltage translation circuitry. |
| Input overvoltage tolerance (to 6V) | Enables reliable interfacing with legacy 5V peripherals while operating from 3.3V supply. |
| 9.5ns max tpd at 5V | Meets timing budgets for 100MHz bus clocking with margin for trace delays and setup/hold. |
| ±24mA output drive | Drives 10+ standard CMOS loads or 2–3 TTL loads without external buffers. |
| Independent OE control | Allows dynamic bus sharing: multiple SN74AC374DW devices can share one bus with staggered OE activation. |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Interface |
|---|---|
|
Use Scenario: Adding parallel digital input/output capability to a microcontroller with limited GPIO count in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as an 8-bit latched input buffer and tri-state output driver, synchronized to MCU address/data strobes. Use Value: Enables deterministic sampling of sensor inputs and glitch-free output updates via single CLK edge, reducing firmware interrupt latency. |
Use Scenario: Interfacing an FPGA or ARM-based SoC to legacy parallel peripherals (e.g., LCD controllers, memory-mapped sensors). IC Role / Device Role / Timing Role: Provides level-shifted, latched, and bus-isolated data path between high-speed core logic and slower external devices. Use Value: Eliminates contention during read-modify-write cycles by enabling/disabling outputs via OE without disrupting internal register state. |
| Test Equipment Digital Pattern Generator | Automated Test Fixture Data Capture |
|
Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing under controlled voltage and timing conditions. IC Role / Device Role / Timing Role: Functions as a programmable pattern latch, driven by a master clock and updated via parallel D-bus writes. Use Value: Delivers sub-10ns edge alignment across all eight bits, critical for setup/hold compliance in high-speed device under test (DUT) interfaces. |
Use Scenario: Capturing parallel status signals (e.g., fault flags, encoder positions) from machinery in real time for diagnostics and logging. IC Role / Device Role / Timing Role: Serves as a synchronized snapshot register, capturing transient states on rising CLK edges aligned to system trigger events. Use Value: Guarantees atomic acquisition of all eight signals - avoids skew-induced metastability seen in cascaded or asynchronous sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC374APWR | Lower VCC range (1.65–3.6V); 3.3V-only optimized; 6.7ns tpd at 3.3V; smaller TSSOP-20 package. | Better suited for modern low-voltage portable/embedded designs; not compatible with 5V buses or mixed-voltage signal sources. | Select SN74LVC374APWR only if system operates strictly at 3.3V and board space is constrained. |
| 74AC574SCX | Same AC logic family; identical 2–6V VCC and timing specs; PDIP-20 package; RoHS-compliant but obsolete in new designs. | Drop-in replacement for through-hole prototyping or legacy repair; lacks TI's production support and thermal specs for SOIC-20. | Choose 74AC574SCX only for hand-soldered evaluation or backward-compatible field repairs where SOIC footprint is unavailable. |
Compared with SN74AC374DW, SN74LVC374APWR offers faster speed at 3.3V but sacrifices 5V compatibility and bus-driving headroom, while 74AC574SCX matches electrical behavior but limits layout flexibility due to through-hole packaging and discontinued status.
Availability
SN74AC374DW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus interface, and automated test fixture data capture requiring stable component supply and long-term industrial temperature support.
Supply support for SN74AC374DW 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 in logic IC design and industrial-grade reliability validation.
The SNx4AC374 product line delivers high-speed, wide-supply-voltage octal flip-flops optimized for bus-oriented digital systems requiring robust noise immunity, mixed-voltage interoperability, and deterministic edge-triggered latching.
FAQ
What is the maximum clock frequency supported by the SN74AC374DW at 5V?
The SN74AC374DW supports a maximum clock frequency of 100MHz at VCC = 5V ± 0.5V, as specified in Section 4.6 of the datasheet. This is derived from minimum pulse width (tw ≥ 4.5ns) and setup/hold timing margins. Real-world operation may require derating based on PCB trace length, load capacitance, and signal integrity.
Can the SN74AC374DW safely interface with 5V logic while powered from 3.3V?
Yes, the SN74AC374DW can safely interface with 5V logic signals while operating from a 3.3V supply because its inputs tolerate voltages up to 6V regardless of VCC level. This eliminates the need for external level-shifting circuitry when connecting to legacy 5V peripherals or buses.
What is the purpose of the OE pin on the SN74AC374DW, and how should it be used?
The OE (output enable) pin on the SN74AC374DW is an active-low control that places all eight Q outputs in high-impedance state when asserted high. It does not affect internal flip-flop operation - data remains latched and can be updated via CLK while outputs are disabled. For reliable power-up behavior, tie OE to VCC via a pullup resistor.
Is the SN74AC374DW pin-compatible with other members of the SN74AC374 family?
Yes, the SN74AC374DW shares identical pinout and function mapping with all other SN74AC374 variants (e.g., SN74AC374DBR, SN74AC374N, SN74AC374NSR), as confirmed in Figure 3-1 and Table 3-1 of the datasheet. Only package dimensions and thermal characteristics differ across variants.
Does the SN74AC374DW require decoupling capacitors, and if so, what value is recommended?
Yes, the SN74AC374DW requires local decoupling: TI recommends a 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND pin (Pin 10). For systems with multiple VCC connections or high noise sensitivity, paralleling a 1µF capacitor improves low-frequency ripple suppression.
SN74AC374DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 155 MHz
- Max Propagation Delay @ V, Max CL:
- 8ns @ 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:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AC374DW FAQ
1.How can I place an order for SN74AC374DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC374DW 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 SN74AC374DW reliable?
The price and inventory of SN74AC374DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC374DW is usually 5 days.
3.What payment methods are accepted for SN74AC374DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC374DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC374DW?
SN74AC374DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC374DW 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 SN74AC374DW?
For technical support, including SN74AC374DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC374DW requirements.
6.How does Aetrix verify that SN74AC374DW is sourced from the original manufacturer or authorized distributors?
All SN74AC374DW 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 SN74AC374DW meets industry standards.
7.What is the process for return or replacement of SN74AC374DW?
All SN74AC374DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC374DW, 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 SN74AC374DW part is unused and in its original packaging.
Return procedure for SN74AC374DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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