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Texas Instruments SN74AHCT374DGVRE4
- Part No.:
- SN74AHCT374DGVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT374DGVRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,852
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Product details
Overview
SN74AHCT374DGVRE4 from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous parallel data latching in 5V digital systems. It operates from 4.5V to 5.5V VCC, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz clock frequency, and features TTL-compatible inputs for seamless interfacing with legacy logic. It is commonly used in bus interface buffers and I/O port expansion.
For engineers reviewing the SN74AHCT374DGVRE4 datasheet, SN74AHCT374DGVRE4 pinout, SN74AHCT374DGVRE4 application, or SN74AHCT374DGVRE4 equivalent, key selection criteria include its 20-pin VSSOP (DGV) package, shared rising-edge CLK and active-low OE control, 8-channel flow-through pinout for simplified PCB routing, and guaranteed 3-state output isolation under industrial temperature range (–40°C to 85°C).
Technical Context
The SN74AHCT374DGVRE4 implements eight independent D-type flip-flops synchronized by a common rising-edge-triggered clock (CLK). Each channel samples the D input on CLK's positive transition and updates Q accordingly. An active-low output enable (OE) independently places all eight outputs into high-impedance without affecting internal state retention or clock operation.
Its balanced CMOS 3-state outputs provide symmetrical sourcing/sinking capability (±25mA), enabling direct drive of capacitive buses up to 50pF while maintaining signal integrity. Input structure includes TTL-compatible thresholds (VIH = 2V, VIL = 0.8V at VCC = 5V) and integrated clamp diodes meeting JESD17 latch-up immunity (>250mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures compatibility with standard 5V TTL/CMOS systems and stable operation across supply variation. |
| Propagation Delay (tPLH/tPHL) | 10.5ns max at VCC = 5V, CL = 15pF - Enables reliable timing in high-speed synchronous designs up to 80MHz. |
| Max Clock Frequency (fmax) | 80MHz at CL = 15pF - Supports real-time data capture in parallel bus applications such as memory address latching. |
| Output Drive (IOH/IOL) | –8mA / +8mA at VOH/VOL limits - Sufficient to drive multiple 74-series inputs or moderate PCB trace capacitance without external buffers. |
| Input Compatibility | TTL-compatible (VIH = 2V, VIL = 0.8V) - Allows direct connection to 5V TTL outputs without level-shifting circuitry. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and communications equipment. |
| ESD Rating (HBM) | ±2000V - Meets standard handling requirements for automated assembly and field-replaceable modules. |
Pinout & Package
SN74AHCT374DGVRE4 is packaged in a 20-pin Very Thin Shrink Small Outline Package (VSSOP, suffix DGV), measuring 5.1mm × 4.9mm body size with 0.5mm lead pitch. The package features a flow-through pinout optimized for minimal trace crossovers on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low enables all eight Q outputs; high forces all outputs into high-impedance - critical for bus arbitration and multi-driver systems. |
| 2 (1Q) – 9 (4Q), 12 (5Q) – 13 (5D), 14 (6D), 15 (6Q), 16 (7Q), 17 (7D), 18 (8D), 19 (8Q) | Channel I/O pairs | Flow-through arrangement (D/Q interleaved per channel) simplifies layer routing and reduces stub length on parallel buses. |
| 10 (CLK) | Rising-edge clock input | Synchronizes all eight flip-flops simultaneously - essential for parallel data capture from ADCs, FIFOs, or microcontroller data buses. |
| 3 (1D) – 4 (2D), 7 (3D), 8 (4D), 13 (5D), 14 (6D), 17 (7D), 18 (8D) | Data inputs | Accept TTL-level signals directly; unused inputs must be tied to VCC or GND to prevent floating-induced oscillation. |
| 11 (GND) | Ground reference | Common return path for all logic and output currents; requires low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Positive supply | Must be decoupled with ≥0.1µF ceramic capacitor placed adjacent to pin to suppress switching noise and ensure stable timing. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Architecture | Independent OE control allows dynamic bus sharing without contention - eliminates need for external bus transceivers in I/O port designs. |
| TTL-Compatible Inputs | VIH = 2V / VIL = 0.8V at VCC = 5V enables direct interface with 74LS, 74F, and other legacy 5V logic families without level shifters. |
| Low Propagation Delay | 10.5ns max ensures setup/hold timing margins are maintained even at 80MHz clock rates in synchronous data acquisition systems. |
| Latch-Up Immunity | Exceeds 250mA per JESD17 - guarantees robust operation in noisy industrial environments with transient coupling on power or signal lines. |
| VSSOP Package (DGV) | 5.1mm × 4.9mm footprint with 0.5mm pitch supports high-density PCB layouts while maintaining hand-solderability and rework feasibility. |
Applications
| Parallel Data Synchronization | Parallel Data Storage |
|---|---|
Use Scenario: Capturing simultaneous 8-bit sensor readings (e.g., ADC output) into a microcontroller data bus before processing. IC Role / Device Role / Timing Role: Acts as a synchronous input register, sampling all eight bits on CLK rising edge to eliminate skew between channels. Use Value: Ensures atomic read of time-critical analog measurements without bit misalignment or metastability risk. |
Use Scenario: Holding configuration data (e.g., DAC settings, filter coefficients) during processor interrupt service routines. IC Role / Device Role / Timing Role: Functions as a static latch buffer, retaining values across CPU context switches using OE-controlled output isolation. Use Value: Prevents bus corruption during firmware updates or real-time task preemption without requiring volatile memory access. |
| Shift Register Stage | Pattern Generator Interface |
Use Scenario: Serving as one stage in a multi-chip serial-to-parallel converter driving LED matrix rows or segment displays. IC Role / Device Role / Timing Role: Provides edge-aligned parallel output staging synchronized to a master clock, feeding subsequent shift stages. Use Value: Eliminates inter-stage skew and enables precise timing alignment across cascaded display drivers or motor control sequencers. |
Use Scenario: Generating fixed test patterns (e.g., walking 1s, checkerboard) for FPGA I/O validation or PCB continuity testing. IC Role / Device Role / Timing Role: Delivers deterministic, glitch-free 8-bit parallel stimulus waveforms controlled via microcontroller GPIO and CLK timing. Use Value: Reduces test firmware complexity by offloading pattern sequencing to hardware, improving repeatability and test speed. |
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 |
|---|---|---|---|
| SN74AHCT574PWRE4 | Same AHCT family, but features transparent latch (not edge-triggered); no CLK↑ requirement - triggered by LE level. | Better suited for asynchronous data capture where clock edge alignment is not required; less suitable for synchronous bus interfaces. | Select SN74AHCT574PWRE4 only when latch-enable control is preferred over clock-edge synchronization. |
| 74LVX374MTCX | Lower voltage operation (2.7V–3.6V), higher propagation delay (13.5ns), and reduced drive (±12mA) - not 5V-tolerant. | Designed for 3.3V systems; incompatible with 5V buses unless level-shifted; unsuitable for mixed-voltage backplanes. | Choose 74LVX374MTCX only in fully 3.3V domains where power efficiency outweighs speed and drive requirements. |
Compared with SN74AHCT374DGVRE4, SN74AHCT574PWRE4 trades edge-triggered precision for simpler control logic, while 74LVX374MTCX sacrifices 5V compatibility and performance for lower power - neither offers pin-to-pin or functional drop-in replacement without design review.
Availability
SN74AHCT374DGVRE4 is available at Aetrix Electronics and suitable for industrial control panels, test equipment interfaces, and embedded data acquisition systems requiring stable component supply and long-term manufacturing continuity.
Supply support for SN74AHCT374DGVRE4 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 decades of heritage in industry-standard logic families.
SN74AHCT374DGVRE4 belongs to the AHCT advanced high-speed CMOS logic series, engineered for 5V systems requiring TTL compatibility, low power, and robust noise immunity in industrial and instrumentation applications.
FAQ
What is the maximum clock frequency supported by SN74AHCT374DGVRE4?
The SN74AHCT374DGVRE4 supports a maximum clock frequency of 80MHz when loaded with 15pF, as specified in the switching characteristics table. At 50pF load, the maximum usable frequency drops to 75MHz. These values assume VCC = 5V ± 0.5V and operation within the recommended temperature range. Exceeding these limits may violate setup/hold timing or increase jitter.
Does SN74AHCT374DGVRE4 require external pull-up resistors on the OE pin?
Yes - to ensure the outputs remain in high-impedance during power-up or power-down sequences, OE should be tied to VCC through a pull-up resistor. TI recommends a minimum value determined by the driver's current-sinking capability; a 10kΩ resistor is typical and sufficient for most applications. Leaving OE floating risks undefined output states and potential bus contention.
Can SN74AHCT374DGVRE4 operate with a 3.3V supply?
No - SN74AHCT374DGVRE4 is specified only for 4.5V to 5.5V VCC operation. Its TTL-compatible inputs and output voltage levels are optimized for 5V systems. Applying 3.3V violates the recommended operating conditions and may result in unreliable logic thresholds, increased propagation delay, or failure to meet VOL/VOH specifications.
What is the purpose of the flow-through pinout in SN74AHCT374DGVRE4?
The flow-through pinout of SN74AHCT374DGVRE4 arranges D and Q terminals alternately across the package (e.g., 1D–1Q–2D–2Q…), enabling straight-line PCB trace routing between adjacent devices. This minimizes layer transitions, reduces crosstalk, and simplifies fan-out in parallel bus architectures such as memory data paths or I/O expanders.
Is SN74AHCT374DGVRE4 compatible with 5V-tolerant microcontroller GPIOs?
Yes - SN74AHCT374DGVRE4 inputs are 5.5V tolerant, allowing direct connection to 5V microcontrollers (e.g., legacy 8051, PIC18F, or MSP430 with 5V I/O) without level-shifting. Its VIH and VIL thresholds match TTL logic, ensuring reliable recognition of HIGH/LOW states even with marginal drive strength or longer traces.
SN74AHCT374DGVRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-TFSOP (0.173", 4.40mm 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:
- 130 MHz
- Max Propagation Delay @ V, Max CL:
- 10.4ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TVSOP
SN74AHCT374DGVRE4 FAQ
1.How can I place an order for SN74AHCT374DGVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374DGVRE4 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 SN74AHCT374DGVRE4 reliable?
The price and inventory of SN74AHCT374DGVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374DGVRE4 is usually 5 days.
3.What payment methods are accepted for SN74AHCT374DGVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374DGVRE4 transactions.
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4.How is shipping managed for SN74AHCT374DGVRE4?
SN74AHCT374DGVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374DGVRE4 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 SN74AHCT374DGVRE4?
For technical support, including SN74AHCT374DGVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374DGVRE4 requirements.
6.How does Aetrix verify that SN74AHCT374DGVRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374DGVRE4 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 SN74AHCT374DGVRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT374DGVRE4?
All SN74AHCT374DGVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374DGVRE4, 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 SN74AHCT374DGVRE4 part is unused and in its original packaging.
Return procedure for SN74AHCT374DGVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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