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Texas Instruments SN74LVC74ABQAR
- Part No.:
- SN74LVC74ABQAR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-WFQFN Exposed Pad
- Datasheet:
-
SN74LVC74ABQAR.pdf
- Description:
- DUAL POSITIVE-EDGE-TRIGGERED D-T
- Quantity:
- Payment:
- Shipping:
Inventory:1,288
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Product details
Overview
SN74LVC74ABQAR from Texas Instruments is a dual positive-edge-triggered D-type flip-flop with independent preset and clear inputs, operating from 1.65V to 3.6V supply, delivering 5.2ns propagation delay at 3.3V, and supporting 5.5V-tolerant inputs for mixed-voltage interfacing in clock-domain translation circuits.
For engineers reviewing the SN74LVC74ABQAR datasheet, SN74LVC74ABQAR pinout, SN74LVC74ABQAR application, or SN74LVC74ABQAR equivalent, this device serves as a low-voltage, high-speed storage element in synchronous logic design, frequency division, and state-machine control where rail-to-rail input tolerance and sub-6ns timing are critical.
Technical Context
The SN74LVC74ABQAR integrates two independent edge-triggered D flip-flops sharing no internal coupling-each with dedicated CLK, D, PRE, CLR, Q, and Q̅ terminals. Its CMOS architecture enables balanced output drive, overvoltage-tolerant inputs (up to 5.5V), and operation down to 1.65V, making it suitable for voltage-level translation between 1.8V/2.5V/3.3V domains.
Functionally, it implements asynchronous set/reset via active-low PRE and CLR, and synchronous data capture on the rising edge of CLK when both controls are high. Timing behavior is characterized by 3.3ns minimum pulse width, 1ns hold time, and ≤5.2ns tpd at VCC = 3.3V, TA = 25°C-verified across –40°C to 125°C industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65V to 3.6V - supports direct integration into 1.8V and 2.5V systems without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - enables safe interfacing with higher-voltage logic without external protection. |
| Max Propagation Delay | 5.2ns at 3.3V - ensures reliable operation in ≥100MHz clock domains with margin. |
| Operating Temperature | –40°C to 125°C - qualified for industrial and automotive under-hood applications. |
| Output Drive Strength | ±24mA at 3V - sufficient to drive multiple LVC loads or moderate PCB traces without buffering. |
| ESD Rating | ±2000V HBM - meets IEC 61000-4-2 system-level robustness requirements. |
| Package | 14-pin WQFN (BQA), 3mm × 2.5mm body - compact footprint for space-constrained PCB layouts. |
Pinout & Package
SN74LVC74ABQAR uses a 14-pin WQFN package (BQA) with exposed thermal pad, 3mm × 2.5mm body size, and 0.5mm pitch. Pin numbering follows TI's standard top-view layout for WQFN devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CLK, 2CLK | Positive-edge clock input | Triggers synchronous data transfer on rising edge; VIH/VIL thresholds scale with VCC. |
| 1D, 2D | Data input | Samples and latches logic state at CLK↑ if PRE/CLR are inactive (high). |
| 1PRE, 2PRE | Asynchronous preset input | Pull low to force Q = HIGH regardless of clock or data; open-drain compatible with pull-up. |
| 1CLR, 2CLR | Asynchronous clear input | Pull low to force Q = LOW regardless of clock or data; priority over PRE and D. |
| 1Q, 2Q | True output | Complementary to Q̅; drives loads up to ±24mA at 3V with controlled edge rates. |
| 1Q̅, 2Q̅ | Inverted output | Provides complementary signal for differential routing or logic inversion without extra gate. |
| VCC | Power supply | Single 1.65–3.6V rail; requires local 0.1µF bypass capacitor adjacent to pin. |
| GND | Ground reference | Common return for all signals and power; connects to exposed thermal pad for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent flip-flops | Enables compact implementation of 2-bit registers, toggle dividers, or parallel loadable counters without inter-chip routing. |
| 5.5V-tolerant inputs | Eliminates need for external level translators when interfacing with legacy 5V or mixed-voltage peripherals. |
| 1.65V minimum VCC | Supports ultra-low-power operation in battery-backed or energy-harvesting systems while maintaining full functionality. |
| Sub-6ns propagation delay | Meets timing closure requirements in high-speed digital interfaces such as SPI clock domain crossing or FPGA glue logic. |
| Industrial temperature range | Guarantees parametric performance from –40°C to 125°C-validated for use in motor control, industrial PLCs, and telecom infrastructure. |
Applications
| Frequency Divider | State Machine Control |
|---|---|
Use Scenario: Dividing a 100MHz system clock to generate a stable 50MHz peripheral clock. IC Role / Device Role / Timing Role: Each flip-flop configured as a toggle (Q→D feedback) provides precise 2× division per stage. Use Value: Achieves jitter-free division with <5.2ns skew between outputs, eliminating need for PLL-based solutions in cost-sensitive designs. |
Use Scenario: Implementing a 4-state sequence controller for LED pattern sequencing in industrial HMI panels. IC Role / Device Role / Timing Role: Two flip-flops form a 2-bit synchronous counter; PRE/CLR enable reset-to-known-state on power-up or fault recovery. Use Value: Reduces BOM count versus microcontroller-based control while ensuring deterministic startup and glitch-free transitions. |
| Level Translation Interface | Glitch-Free Data Capture |
Use Scenario: Interfacing a 3.3V FPGA I/O bank to a 5V sensor interface bus. IC Role / Device Role / Timing Role: SN74LVC74ABQAR accepts 5V inputs safely while driving 3.3V-compatible outputs, acting as bidirectional voltage translator. Use Value: Prevents damage from overvoltage and avoids timing uncertainty caused by external resistor-divider networks. |
Use Scenario: Capturing asynchronous status bits from a motor driver IC into a synchronized control pipeline. IC Role / Device Role / Timing Role: Synchronizes metastable inputs using dual-stage sampling (two cascaded flip-flops) to reduce MTBF to <1 failure per 10⁹ hours. Use Value: Provides hardware-level synchronization without software overhead or FPGA resource consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC74APWR | Same logic function and electrical specs, but in 14-pin TSSOP (PW) package (5mm × 6.4mm); RθJA = 150.8°C/W vs. BQA's 102.3°C/W. | Less thermally efficient; preferred only when board assembly uses legacy TSSOP tooling or requires larger pitch for manual rework. | Select SN74LVC74APWR only if TSSOP footprint compatibility or hand-solderability outweighs thermal and space advantages of BQA. |
| 74LVC74AD | Identical SOIC-14 (D) variant; 8.65mm × 6mm body; RθJA = 127.8°C/W; same VCC range and timing but higher parasitic capacitance. | Higher trace inductance and longer signal paths limit use in >80MHz designs; not recommended for high-density RF-adjacent layouts. | Choose 74LVC74AD only for through-hole prototyping, legacy board redesigns, or where SOIC's mechanical robustness justifies larger area. |
Compared with SN74LVC74APWR and 74LVC74AD, SN74LVC74ABQAR offers superior thermal performance (102.3°C/W), smallest footprint (3mm × 2.5mm), and best high-frequency signal integrity-making it optimal for modern compact industrial controllers and high-speed interface bridges.
Availability
SN74LVC74ABQAR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC74ABQAR 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 50 years of innovation in high-reliability digital ICs.
The SN74LVC74A product line delivers low-voltage, high-speed dual D-type flip-flops optimized for voltage translation, clock domain bridging, and synchronous logic in industrial, automotive, and communications equipment.
FAQ
What is the maximum clock frequency supported by SN74LVC74ABQAR?
SN74LVC74ABQAR supports up to 100MHz at VCC = 3.3V ± 0.3V and TA = –40°C to 85°C, and 83MHz at VCC = 2.7V across –40°C to 125°C. The 150MHz rating applies only under restricted conditions (TA = –40°C to 85°C, VCC = 3.3V), per TI's SCAS287W datasheet Section 5.8.
Does SN74LVC74ABQAR require external pull-up resistors on PRE and CLR pins?
SN74LVC74ABQAR does not require external pull-ups on PRE or CLR-these inputs are internally pulled up in most configurations, but TI recommends tying unused PRE/CLR pins directly to VCC or GND to prevent floating states. The device functions correctly with either hard-wired or actively driven control lines.
Can SN74LVC74ABQAR operate reliably at 1.65V supply voltage?
Yes, SN74LVC74ABQAR is fully specified from 1.65V to 3.6V. At 1.65V, it maintains guaranteed timing (tpd ≤ 7.1ns), output drive (±4mA), and logic thresholds (VIH = 0.65×VCC), enabling use in ultra-low-power battery-operated systems without performance compromise.
Is the exposed thermal pad on SN74LVC74ABQAR electrically connected?
No, the exposed thermal pad on SN74LVC74ABQAR is not electrically connected-it is a mechanical thermal relief structure. TI documentation specifies that the pad must be soldered to a PCB thermal plane for optimal heat dissipation but must remain isolated from any signal or power net.
How does SN74LVC74ABQAR handle input signals exceeding VCC?
SN74LVC74ABQAR features 5.5V-tolerant inputs, meaning it safely accepts VI up to 5.5V regardless of VCC (1.65V–3.6V). This is achieved via internal clamping structures-not level-shifting-so no current flows into VCC, and logic thresholds remain referenced to the applied VCC rail.
SN74LVC74ABQAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 100 MHz
- Max Propagation Delay @ V, Max CL:
- 5.2ns @ 3.3V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Current - Quiescent (Iq):
- 10 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-WQFN (3x2.5)
SN74LVC74ABQAR FAQ
1.How can I place an order for SN74LVC74ABQAR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC74ABQAR 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 SN74LVC74ABQAR reliable?
The price and inventory of SN74LVC74ABQAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC74ABQAR is usually 5 days.
3.What payment methods are accepted for SN74LVC74ABQAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC74ABQAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC74ABQAR?
SN74LVC74ABQAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC74ABQAR 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 SN74LVC74ABQAR?
For technical support, including SN74LVC74ABQAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC74ABQAR requirements.
6.How does Aetrix verify that SN74LVC74ABQAR is sourced from the original manufacturer or authorized distributors?
All SN74LVC74ABQAR 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 SN74LVC74ABQAR meets industry standards.
7.What is the process for return or replacement of SN74LVC74ABQAR?
All SN74LVC74ABQAR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC74ABQAR, 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 SN74LVC74ABQAR part is unused and in its original packaging.
Return procedure for SN74LVC74ABQAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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