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Texas Instruments SN74AHCT374DGVR
- Part No.:
- SN74AHCT374DGVR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT374DGVR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
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Product details
Overview
SN74AHCT374DGVR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for synchronous data latching and bus interface in 5V digital systems. It operates from 4.5V to 5.5V, delivers 10.5ns propagation delay at 5V/15pF, supports up to 80MHz clock frequency, and features TTL-compatible inputs for seamless integration with legacy logic. It is commonly used in parallel data storage and bidirectional bus driving applications.
For engineers reviewing the SN74AHCT374DGVR datasheet, SN74AHCT374DGVR pinout, SN74AHCT374DGVR application, or SN74AHCT374DGVR equivalent, key selection considerations include its 20-pin VSSOP (DGS) package, rising-edge clock triggering, active-low 3-state output enable, guaranteed 8mA drive strength per output, and compatibility with 5V TTL input thresholds.
Technical Context
The SN74AHCT374DGVR implements eight independent D-type flip-flops sharing a common rising-edge-sensitive CLK and an active-low OE control signal. Its 3-state outputs use balanced CMOS drivers capable of sourcing and sinking up to ±8mA at VOH ≥ 3.8V and VOL ≤ 0.44V under 5V operation.
All eight channels operate synchronously on the CLK rising edge, with setup time (tsu) and hold time (th) both specified at 2.5ns. The device maintains functional integrity across –40°C to +85°C and exhibits latch-up immunity exceeding 250mA per JESD17, making it suitable for industrial-grade bus-holding and I/O buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures stable operation in standard 5V logic rails with ±10% tolerance. |
| Propagation Delay (tPLH/tPHL) | 10.5ns max at VCC = 5V, CL = 15pF - Enables reliable timing in high-speed 80MHz synchronous buses. |
| Max Clock Frequency (fmax) | 80MHz at CL = 15pF - Supports real-time parallel data capture in microcontroller peripheral interfaces. |
| Output Drive (IOH/IOL) | –8mA / +8mA at VOH ≥ 3.8V, VOL ≤ 0.44V - Drives multiple 74-series loads or light capacitive buses without external buffers. |
| Input Compatibility | TTL-compatible VIH = 2V, VIL = 0.8V - Interfaces directly with 5V TTL outputs without level-shifting. |
| 3-State Enable | Active-low OE with tPZH/tPLZ ≤ 11.5ns - Allows fast bus arbitration and multi-drop contention management. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient environments including motor control and PLC I/O modules. |
Pinout & Package
SN74AHCT374DGVR is packaged in a 20-pin Very Small Outline Package (VSSOP), also designated DGS, measuring 5.1mm × 4.9mm body size with 0.5mm lead pitch. This thermally enhanced surface-mount package supports automated assembly and offers improved thermal resistance (RθJA = 131.6°C/W) compared to larger SOIC variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Disables all Q outputs into high-impedance state; must be pulled high via resistor during power-up to prevent bus contention. |
| 2–9, 12, 15–16, 19 (Q1–Q8) | 3-state buffered outputs | Reflect D-input values on CLK rising edge; tri-state when OE = HIGH; tolerate floating states safely. |
| 3–4, 7–8, 13–14, 17–18 (D1–D8) | Data inputs | TTL-compatible; require fast transitions (≤20 ns/V) and must be terminated to VCC/GND if unused. |
| 10 (CLK) | Rising-edge clock | Synchronizes all eight flip-flops simultaneously; no internal debouncing - external clock jitter must be minimized. |
| 11 (GND) | Ground reference | Primary return path for all I/O and supply currents; requires low-inductance connection to system ground plane. |
| 20 (VCC) | Positive supply | Must be decoupled with 0.1µF ceramic capacitor placed adjacent to pin; supports 4.5–5.5V only. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pinout | Input and output pins arranged to minimize trace crossovers on PCBs - simplifies routing for dense 8-bit data buses. |
| Balanced CMOS 3-state outputs | Sinks and sources equal current (±8mA), enabling bidirectional bus driving without external direction control logic. |
| Latch-up immunity | Exceeds 250mA per JESD17 - ensures robustness against transient ground bounce or ESD-induced latch-up in noisy industrial settings. |
| Low dynamic power consumption | Cpd = 27pF - reduces switching current and heat generation in high-frequency clocked applications. |
| 5.5V-tolerant inputs | Accepts input voltages up to 5.5V regardless of VCC - allows safe interfacing with higher-voltage peripherals or mixed-supply systems. |
Applications
| Parallel Data Synchronization | Parallel Data Storage |
|---|---|
|
Use Scenario: Capturing asynchronous sensor data (e.g., ADC output bus) into a microcontroller's synchronized read cycle. IC Role / Device Role / Timing Role: Acts as a clocked input register - samples all 8 bits simultaneously on CLK rising edge and holds stable values until next capture. Use Value: Eliminates metastability risk and enables deterministic timing alignment between external peripherals and MCU clock domains. |
Use Scenario: Holding configuration byte values (e.g., DAC gain settings, GPIO direction masks) across power cycles or mode transitions. IC Role / Device Role / Timing Role: Functions as a static latch - retains last-written D-input state at Q outputs while OE remains inactive. Use Value: Provides nonvolatile-like behavior without EEPROM, reducing firmware complexity and write-cycle limitations. |
| Shift Register Stage | Pattern Generator Output Buffer |
|
Use Scenario: Serving as one stage in an 8-bit serial-to-parallel shift register chain for LED matrix row/column addressing. IC Role / Device Role / Timing Role: Receives shifted-in data on D inputs and propagates it to Q outputs on each CLK edge - cascaded with other SN74AHCT374DGVR units. Use Value: Delivers precise, glitch-free parallel output updates synchronized to master clock - critical for flicker-free display refresh. |
Use Scenario: Driving test patterns (e.g., walking-1, checkerboard) from FPGA or microcontroller GPIO to DUT stimulus lines. IC Role / Device Role / Timing Role: Buffers and isolates pattern generator outputs using 3-state control - enables dynamic reconfiguration of stimulus bus topology. Use Value: Prevents back-driving during pattern changes and supports hot-swappable test fixtures without hardware redesign. |
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 |
|---|---|---|---|
| SN74AHCT574PW | Same function but uses separate LE (latch enable) instead of CLK edge-triggering; no built-in clock distribution network. | Requires external clock gating logic for synchronous update; better suited for address/data latching where clock is shared externally. | Select SN74AHCT574PW when latch timing must be decoupled from system clock edges or when board layout favors TSSOP over VSSOP. |
| 74LVC374APW | Lower VCC range (1.65–3.6V), 3.3V-native I/O, 7.2ns propagation delay, but only ±24mA drive at 3.3V. | Designed for modern low-voltage systems; incompatible with 5V TTL inputs unless level-shifted. | Choose 74LVC374APW for battery-powered or mixed-signal designs operating at 3.3V with tighter timing budgets and lower power. |
Compared with SN74AHCT374DGVR, SN74AHCT574PW offers flexible latch control but lacks integrated clock synchronization, while 74LVC374APW delivers faster speed and lower voltage operation at the cost of 5V compatibility and reduced noise margin in legacy systems.
Availability
SN74AHCT374DGVR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for SN74AHCT374DGVR 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 experience in high-reliability logic families and industrial-grade qualification.
SN74AHCT374DGVR belongs to the AHCT logic family - engineered for 5V TTL interoperability, robust noise immunity, and industrial temperature operation, targeting bus interface, data acquisition, and control subsystems.
FAQ
What is the maximum clock frequency supported by SN74AHCT374DGVR?
The SN74AHCT374DGVR supports a maximum clock frequency of 80MHz when loaded with 15pF capacitance. At 50pF load, the maximum usable frequency drops to 75MHz. These values are measured under recommended operating conditions (VCC = 5V ± 0.5V, TA = 25°C) and assume clean, monotonic clock edges with minimal jitter. For reliable operation in production systems, derating to 70MHz is advised to accommodate process variation and temperature extremes.
Can SN74AHCT374DGVR interface directly with 3.3V microcontrollers?
Yes, SN74AHCT374DGVR can accept 3.3V logic levels on its D and CLK inputs because its VIH threshold is only 2.0V (min) at VCC = 4.5V–5.5V. However, its outputs swing rail-to-rail (0V to VCC), so connecting Q outputs directly to a 3.3V-only input may violate that device's absolute maximum input rating. Use series resistors or level translators if the receiving device does not tolerate 5V inputs.
What is the correct power-up sequence for SN74AHCT374DGVR to avoid bus contention?
To prevent undefined output states during power-up, OE must be held HIGH (inactive) until VCC stabilizes. TI recommends tying OE to VCC through a 10kΩ pull-up resistor. This ensures all Q outputs remain in high-impedance state until firmware asserts OE = LOW. Simultaneously, CLK should be held LOW or stable, and all D inputs should be terminated to known logic levels (VCC or GND) to avoid metastability or excessive current draw.
Does SN74AHCT374DGVR support hot insertion or live bus swapping?
No, SN74AHCT374DGVR is not hot-swap rated. Its absolute maximum ratings do not cover powered insertion into a live bus. Applying VCC before establishing proper GND connection, or exposing outputs to voltage before power stabilization, risks latch-up or permanent damage due to uncontrolled current paths. Always power down the system before inserting or removing SN74AHCT374DGVR.
How much capacitance can SN74AHCT374DGVR reliably drive on its outputs?
SN74AHCT374DGVR is characterized for loads up to 50pF while meeting all AC timing specifications. Driving >50pF increases propagation delay and may cause signal integrity issues like ringing or undershoot, especially at higher frequencies. For heavier loads, add series termination (22–33Ω) near the driver and ensure short, controlled-impedance traces. TI's datasheet confirms stable operation at 15pF (10.5ns delay) and 50pF (11.5ns delay).
SN74AHCT374DGVR 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
SN74AHCT374DGVR FAQ
1.How can I place an order for SN74AHCT374DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT374DGVR 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 SN74AHCT374DGVR reliable?
The price and inventory of SN74AHCT374DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT374DGVR is usually 5 days.
3.What payment methods are accepted for SN74AHCT374DGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT374DGVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT374DGVR?
SN74AHCT374DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT374DGVR 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 SN74AHCT374DGVR?
For technical support, including SN74AHCT374DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT374DGVR requirements.
6.How does Aetrix verify that SN74AHCT374DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT374DGVR 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 SN74AHCT374DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHCT374DGVR?
All SN74AHCT374DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT374DGVR, 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 SN74AHCT374DGVR part is unused and in its original packaging.
Return procedure for SN74AHCT374DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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