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Texas Instruments SN74ACT374DBR
- Part No.:
- SN74ACT374DBR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ACT374DBR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,865
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Product details
Overview
SN74ACT374DBR from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, operating at 4.5 V to 5.5 V supply, featuring 10 ns max propagation delay at 5 V, TTL-compatible inputs, and ±24 mA output drive. It serves as a bus-oriented register or I/O port in digital systems requiring high-capacitance load driving and bidirectional data isolation.
For engineers reviewing the SN74ACT374DBR datasheet, SN74ACT374DBR pinout, SN74ACT374DBR application, or SN74ACT374DBR equivalent, this page delivers verified functional modes, timing constraints, thermal metrics for SSOP-20, and real-world implementation guidance for bus buffering and register staging in industrial control and embedded interfaces.
Technical Context
The SN74ACT374DBR implements eight independent D-type flip-flops triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its output-enable logic does not affect internal state retention, allowing data updates while outputs remain high-impedance.
Designed for bus-driving applications, it supports ±24 mA output current per pin at 5 V, operates across −40°C to +85°C, and exhibits 1.5 ns min hold time and 5.5 ns max setup time relative to CLK↑. The device uses ACT (Advanced CMOS TTL-compatible) logic family architecture with 40 pF typical power dissipation capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerance to supply ripple. |
| tpd (Max) | 10 ns at 5 V - Enables reliable operation up to 90 MHz clock frequency in synchronous register applications. |
| IOL / IOH | ±24 mA - Sufficient drive strength to directly interface with 50 Ω transmission lines or multiple CMOS inputs without external buffers. |
| tsu / th | 5.5 ns setup / 1.5 ns hold - Defines minimum data stability window before and after CLK↑ for deterministic sampling in high-speed control logic. |
| Cpd | 40 pF - Predictable dynamic power consumption under 1 MHz switching at CL = 50 pF, critical for thermal budgeting in dense PCB layouts. |
| RθJA | 70 °C/W (SSOP-20) - Determines maximum allowable power dissipation (≈171 mW at 85°C ambient) before junction temperature exceeds 150°C. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8 V/2.0 V logic thresholds, enabling direct connection to legacy 5 V TTL outputs without level-shifting. |
Pinout & Package
SN74ACT374DBR is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch, 7.2 mm × 7.8 mm body-to-body footprint, and 2.0 mm max height. The package is RoHS-compliant, moisture-sensitive level 1, and optimized for automated surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable input | Active-low control: drives all Q outputs to high-impedance when high; no effect on internal flip-flop state. |
| 2–9, 12, 15–16, 19 (1Q–8Q) | Registered outputs | Edge-triggered Q states reflect D inputs sampled at CLK↑; tri-stated when OE = high. |
| 3–4, 7–8, 13–14, 17–18 (1D–8D) | Data inputs | Asynchronous inputs latched only on CLK↑; must meet tsu/th relative to clock edge. |
| 10 (GND) | Ground reference | Primary return path for all output currents and internal logic; requires low-inductance PCB connection. |
| 11 (CLK) | Clock input | Rising-edge sensitive; determines exact sampling instant for all eight D inputs simultaneously. |
| 20 (VCC) | Power supply | 5 V nominal supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Outputs with Independent OE | Enables shared bus architectures by isolating outputs without affecting internal register state during data updates. |
| 10 ns Max Propagation Delay at 5 V | Supports 90 MHz system clocks in register pipelines, reducing latency in real-time control loops and data acquisition stages. |
| TTL-Compatible Input Thresholds | Accepts standard 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), eliminating need for external level translators in mixed-logic systems. |
| ±24 mA Output Drive Capability | Drives up to 10 LS-TTL loads or 50 Ω transmission lines directly, reducing component count in I/O expansion modules. |
| High-Noise-Immunity ACT Logic Family | Guarantees 1.0 V noise margin at 5 V supply, improving robustness against crosstalk and ground bounce in high-density boards. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Adding parallel digital input/output capability to a microcontroller-based PLC rack using shared data/address buses. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer, synchronizing sensor readings and actuator commands to the main controller's clock domain. Use Value: Eliminates need for discrete transceivers or pull-up networks; 3-state outputs prevent bus contention during read/write cycles. |
Use Scenario: Interfacing door lock actuators, window motors, and lighting drivers to a central BCM MCU over a local parallel control bus. IC Role / Device Role / Timing Role: Provides isolated, glitch-free output staging for safety-critical functions, with OE controlled by MCU fault-handling logic. Use Value: ±24 mA drive ensures reliable activation of 12 V relay coils via level-shifting transistors; 10 ns tpd enables fast response to CAN-triggered commands. |
| Test Equipment Digital Pattern Generator | Legacy System Bus Interface Adapter |
|
Use Scenario: Generating synchronized 8-bit stimulus patterns for IC functional testing, where precise timing and bus isolation are mandatory. IC Role / Device Role / Timing Role: Functions as a programmable pattern register, capturing test vectors on CLK↑ and presenting them to DUT pins via tri-stated outputs. Use Value: 5.5 ns setup time allows alignment with 100 MHz pattern clocks; high-impedance mode prevents back-driving during vector transitions. |
Use Scenario: Bridging a modern FPGA-based controller to an aging 8-bit ISA-style peripheral bus with strict timing and loading requirements. IC Role / Device Role / Timing Role: Serves as a bidirectional bus transceiver and address/data latch, managing direction control and timing handshaking. Use Value: TTL-compatible inputs accept legacy bus signals directly; 70 °C/W RθJA permits stable operation in unventilated test enclosures. |
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 |
|---|---|---|---|
| SN74ACT574DBR | Octal D-type transparent latch (latch enable instead of clock edge); identical SSOP-20 package and ACT logic family. | Suitable for level-sensitive data capture (e.g., address latching), not edge-triggered register staging. | Select SN74ACT574DBR when synchronous sampling on CLK edge is unnecessary and gated data transparency is preferred. |
| 74LVC374APW | 3.3 V only (1.65–3.6 V), lower drive (±24 mA), TSSOP-20 package; LVC family with higher noise immunity but incompatible voltage range. | Applicable in 3.3 V systems with tighter power budgets; not interoperable with 5 V buses without level translation. | Choose 74LVC374APW only for new 3.3 V designs; avoid in mixed-voltage or legacy 5 V environments where SN74ACT374DBR is specified. |
Compared with SN74ACT374DBR, SN74ACT574DBR replaces edge-triggered behavior with level-sensitive latching-critical for address strobing but unsuitable for clock-synchronized registers-while 74LVC374APW mandates full 3.3 V system redesign due to non-overlapping VCC range and different logic thresholds.
Availability
SN74ACT374DBR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and test equipment digital pattern generation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ACT374DBR 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, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT374DBR belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, 5 V TTL-compatible digital interfacing in noise-prone industrial and automotive environments where reliability and bus-driving capability are essential.
FAQ
What is the maximum clock frequency supported by SN74ACT374DBR?
The SN74ACT374DBR supports a maximum clock frequency of 90 MHz under recommended operating conditions (VCC = 5 V, TA = −40°C to +85°C), derived from its 5 ns minimum clock pulse width and 10 ns max propagation delay. This rating ensures reliable setup/hold timing margins in synchronous register applications without violating internal timing constraints.
Does SN74ACT374DBR 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 through a pull-up resistor. TI specifies that the minimum resistor value depends on the current-sinking capability of the driver controlling OE; typical values range from 4.7 kΩ to 10 kΩ to ensure OE remains logic-high when unasserted.
Can SN74ACT374DBR drive 50 Ω transmission lines directly?
Yes - the SN74ACT374DBR provides ±24 mA output drive per pin at 5 V, sufficient to drive 50 Ω lines terminated at the far end (requiring ~100 mA peak for 5 V swing). However, proper PCB layout with controlled impedance traces and local decoupling is required to maintain signal integrity and avoid ringing.
Is SN74ACT374DBR pin-compatible with other packages in the 'ACT374 family?
No - while SN74ACT374DBR shares identical logic functionality and pin numbering with DW (SOIC), N (PDIP), NS (SO), and PW (TSSOP) variants, mechanical dimensions, lead pitch, and thermal characteristics differ. PCB layout must be specific to the SSOP-20 (DB) footprint; no physical interchangeability exists between packages.
What is the purpose of the Ci parameter (4.5 pF) listed in SN74ACT374DBR's electrical characteristics?
The Ci parameter (input capacitance = 4.5 pF typical at 5 V) quantifies the capacitive load each input presents to its driving source. This value directly impacts fan-out capability, rise/fall time degradation, and total power consumption in high-frequency switching - critical when cascading multiple 'ACT374 devices or driving from weak sources like microcontroller GPIOs.
SN74ACT374DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 160 MHz
- Max Propagation Delay @ V, Max CL:
- 8.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- 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-SSOP
SN74ACT374DBR FAQ
1.How can I place an order for SN74ACT374DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT374DBR 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 SN74ACT374DBR reliable?
The price and inventory of SN74ACT374DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT374DBR is usually 5 days.
3.What payment methods are accepted for SN74ACT374DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT374DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT374DBR?
SN74ACT374DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT374DBR 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 SN74ACT374DBR?
For technical support, including SN74ACT374DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT374DBR requirements.
6.How does Aetrix verify that SN74ACT374DBR is sourced from the original manufacturer or authorized distributors?
All SN74ACT374DBR 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 SN74ACT374DBR meets industry standards.
7.What is the process for return or replacement of SN74ACT374DBR?
All SN74ACT374DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT374DBR, 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 SN74ACT374DBR part is unused and in its original packaging.
Return procedure for SN74ACT374DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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