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STMicroelectronics 74VHCT74ATTR
- Part No.:
- 74VHCT74ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT74ATTR.pdf
- Description:
- IC FF D-TYPE DUAL 1BIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,528
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Product details
Overview
74VHCT74ATTR from STMicroelectronics is a dual D-type flip-flop with asynchronous preset and clear, designed for high-speed 5V logic interfacing. It features 160 MHz max clock frequency (typ.), 8 mA output drive, TTL-compatible inputs (VIH ≥ 2 V, VIL ≤ 0.8 V), and operates from 4.5 V to 5.5 V. Used in clocked data synchronization, state machines, and bus interface control in industrial controllers and communication modules.
For engineers reviewing the 74VHCT74ATTR datasheet, 74VHCT74ATTR pinout, 74VHCT74ATTR application, or 74VHCT74ATTR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), power-down input/output protection, latch-up immunity, and 2 kV ESD tolerance - all critical for robust 5V digital system design.
Technical Context
This device implements two independent edge-triggered D flip-flops, each with active-low asynchronous set (PR) and reset (CLR) inputs. Clocking is positive-edge sensitive, and data transfer occurs on the rising edge of CK. Inputs tolerate 0–7 V regardless of VCC, enabling safe 5V-to-3V interface operation.
All I/O pins feature diode-based ESD protection (2 kV HBM), power-down protection, and symmetrical output drive (|IOH| = IOL = 8 mA min). The sub-micron C2MOS process ensures low quiescent current (ICC ≤ 2 µA at 25°C) and improved latch-up immunity over standard VHCT families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 160 MHz (typ.) at VCC = 5 V - enables high-speed synchronous logic in timing-critical control paths |
| VCC Range | 4.5 V to 5.5 V - supports industrial-grade 5V supply tolerance with margin |
| tPLH / tPHL | 7.8 ns (max, CL = 15 pF) - ensures balanced rise/fall propagation for jitter-sensitive clock distribution |
| IOH / IOL | –8 mA / +8 mA (min) - drives standard TTL loads without external buffers |
| VIH / VIL | 2.0 V (min) / 0.8 V (max) - guarantees compatibility with legacy TTL output voltage levels |
| ICC (Quiescent) | 2 µA (max at TA = 25°C) - minimizes standby power in battery-backed or energy-sensitive systems |
| ESD Rating | 2 kV HBM - provides built-in protection against handling-induced electrostatic discharge |
Pinout & Package
TSSOP-14 package (4.9 mm × 6.4 mm, 0.65 mm pitch), thin shrink small outline with exposed pad not present; RoHS-compliant, tape-and-reel packaged (74VHCT74ATTR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | 1CLR, 2CLR | Active-low asynchronous reset - forces Q = L, Q̅ = H independent of clock |
| 2, 12 | 1D, 2D | Data input - sampled on rising clock edge and latched to Q/Q̅ outputs |
| 3, 11 | 1CK, 2CK | Positive-edge clock - triggers synchronous data capture with <5 ns setup/hold window |
| 4, 10 | 1PR, 2PR | Active-low asynchronous preset - forces Q = H, Q̅ = L independent of clock |
| 5, 9 | 1Q, 2Q | True output - reflects stored D value after clock edge or async control assertion |
| 6, 8 | 1Q̅, 2Q̅ | Inverted output - complements Q; usable as feedback or dual-rail signaling source |
| 7 | GND | Ground reference - common return for all internal logic and I/O circuits |
| 14 | VCC | Positive supply - powers core logic and output drivers; accepts 4.5–5.5 V |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V - eliminates level-shifting when interfacing with legacy 74LS/74ALS devices |
| Input/Output Power-Down Protection | Accepts 0–7 V on all pins with VCC = 0 V - prevents back-powering and latch-up during hot-swap or partial power-down |
| Symmetrical Output Drive | |IOH| = IOL = 8 mA (min) - ensures matched rise/fall times and reduces signal skew in fanout networks |
| Wide Operating Temperature | –55°C to +125°C - supports deployment in automotive engine control units and industrial PLCs |
| Enhanced Latch-Up Immunity | Qualified per JEDEC JESD78 - withstands >100 mA injected current without functional failure |
Applications
| Industrial PLC I/O Modules | Digital Bus Interface Logic |
|---|---|
Use Scenario: Synchronizing sensor data acquisition across multiple channels before transmission to a central controller. IC Role / Device Role / Timing Role: Dual-edge-aligned data latch providing metastability-hardened sampling of parallel status lines. Use Value: Balanced tPLH/tPHL (≤7.8 ns) and 2 kV ESD rating ensure deterministic timing and field reliability in noisy factory environments. | Use Scenario: Level-shifting and clock-domain bridging between 5V microcontroller peripherals and 3V FPGA configuration interfaces. IC Role / Device Role / Timing Role: Voltage-tolerant D flip-flop enabling safe 5V→3V signal translation without external biasing. Use Value: Input voltage range (0–7 V) and TTL thresholds allow direct connection to 5V sources while driving 3V CMOS loads. |
| Automotive Body Control Units | Test Equipment Pattern Generators |
Use Scenario: Debouncing mechanical switch inputs and generating synchronized enable pulses for LED driver ICs. IC Role / Device Role / Timing Role: Asynchronous preset/clear used for hardware-initiated state reset during ignition cycle transitions. Use Value: –55°C to +125°C operation and latch-up immunity meet AEC-Q100 Grade 1 requirements for under-hood electronics. | Use Scenario: Generating precise, repeatable test vectors for ASIC validation using programmable clock edges. IC Role / Device Role / Timing Role: Dual flip-flop configured as a 2-bit shift register or toggle divider in pattern generation logic. Use Value: 160 MHz fMAX and <5 ns setup time support sub-10 ns timing resolution in automated test systems. |
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 |
|---|---|---|---|
| SN74VHCT74PW | TSSOP-14, identical AC/DC specs, same 2 kV ESD rating, but TI's version uses different process node and has slightly higher ICC (3 µA max) | No functional difference in 5V logic systems; pinout and truth table fully identical | Select when TI-sourced supply chain alignment is required or for dual-sourcing redundancy |
| 74LCX74MTCX | Lower VCC range (2.0–3.6 V), 3.3V-only operation; no 5V tolerance; 150 MHz fMAX (typ); 24 mA drive | Not suitable for 5V systems; requires level translation if interfacing with 5V logic | Choose only for pure 3.3V domains where lower voltage operation and higher drive are prioritized |
Compared with SN74VHCT74PW, 74VHCT74ATTR offers identical functionality and tighter ICC spec; versus 74LCX74MTCX, it delivers native 5V compatibility and input overvoltage tolerance - essential for mixed-voltage board designs.
Availability
74VHCT74ATTR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and digital bus interface logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT74ATTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for automotive, industrial, and power management applications since 1987.
The VHCT logic family targets high-speed, low-power 5V CMOS applications with TTL compatibility and enhanced robustness - specifically engineered for industrial control, instrumentation, and legacy-system upgrades.
FAQ
Can 74VHCT74ATTR operate with a 3.3V supply?
No. The 74VHCT74ATTR is specified only for VCC = 4.5 V to 5.5 V. Its TTL-compatible inputs require ≥2.0 V VIH, and internal logic thresholds are optimized for 5V operation. Using 3.3V will result in undefined behavior and failure to meet AC timing specifications.
Does this device support hot-swap insertion?
Yes. All inputs and outputs feature power-down protection, allowing 0–7 V to be applied regardless of VCC state. This prevents back-driving, latch-up, or damage during live insertion into powered backplanes - confirmed by absolute maximum ratings and input equivalent circuit analysis.
What is the minimum pulse width for PR and CLR inputs?
The minimum low pulse width for PR and CLR is 5.0 ns (at VCC = 5.0 V ± 0.5 V), as specified in Table 7. This ensures reliable asynchronous assertion across the full operating temperature range (–55°C to +125°C) without race conditions or metastability.
Is there a lead-free and RoHS-compliant version?
Yes. The 74VHCT74ATTR is manufactured in a RoHS-compliant TSSOP-14 package with lead-free terminations (matte tin), per STMicroelectronics' ECOPACK2 specification. Full compliance documentation, including substance declarations and test reports, is available upon request.
74VHCT74ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHCT
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 140 MHz
- Max Propagation Delay @ V, Max CL:
- 8.8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 2 µA
- Input Capacitance:
- 6 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74VHCT74ATTR FAQ
1.How can I place an order for 74VHCT74ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT74ATTR 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 74VHCT74ATTR reliable?
The price and inventory of 74VHCT74ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT74ATTR is usually 5 days.
3.What payment methods are accepted for 74VHCT74ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT74ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT74ATTR?
74VHCT74ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT74ATTR 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 74VHCT74ATTR?
For technical support, including 74VHCT74ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT74ATTR requirements.
6.How does Aetrix verify that 74VHCT74ATTR is sourced from the original manufacturer or authorized distributors?
All 74VHCT74ATTR 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 74VHCT74ATTR meets industry standards.
7.What is the process for return or replacement of 74VHCT74ATTR?
All 74VHCT74ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT74ATTR, 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 74VHCT74ATTR part is unused and in its original packaging.
Return procedure for 74VHCT74ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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