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Texas Instruments CD74FCT374E
- Part No.:
- CD74FCT374E
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74FCT374E.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,207
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Product details
Overview
CD74FCT374E from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, implemented in BiCMOS technology. It features 48-mA output sink current, 70-MHz maximum clock frequency, and 3.7-V limited output voltage swing. Designed for bus interface applications, it serves as a buffer register or bidirectional bus driver in 5-V digital systems.
For engineers reviewing the CD74FCT374E datasheet, CD74FCT374E pinout, CD74FCT374E application, or CD74FCT374E equivalent, key selection criteria include its 3-state output control via OE, low-EMI output swing, input isolation from VCC, and compatibility with TTL-level inputs in industrial logic designs.
Technical Context
The CD74FCT374E uses a hybrid BiCMOS process combining bipolar speed and CMOS low quiescent power. Its output stage clamps high-level voltage to ~3.7 V (two diode drops below VCC), reducing ground/VCC bounce and EMI during simultaneous switching.
All eight D-type flip-flops trigger on the low-to-high CLK transition. The buffered OE input enables independent 3-state control without affecting internal register operation-allowing data retention or updates while outputs remain high-impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation in standard 5-V TTL/CMOS mixed-signal environments |
| Max Clock Frequency | 70 MHz - supports high-speed data latching in bus arbitration and I/O port timing-critical paths |
| Output Sink Current | 48 mA per pin - drives heavy capacitive loads (e.g., backplane buses) without external buffers |
| Propagation Delay | 2 ns to 10 ns (tpd) - enables sub-14-ns cycle time at 70 MHz with margin for setup/hold |
| Input Transition Rate | 0–10 ns/V - accommodates standard TTL-edge rates without false triggering |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded and industrial control systems |
| Power Dissipation Cap. | 33 pF - predicts dynamic power consumption under 1-MHz no-load conditions |
Pinout & Package
E package: 20-pin plastic dual in-line package (DIP), through-hole mountable, 0.3-inch body width, industry-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low 3-state control; high = high-Z outputs, independent of clock or register state |
| 2–9, 11–18 | 1D–8D, 1Q–8Q | Eight D-inputs and noninverted Q-outputs; each pair forms one edge-triggered register stage |
| 10 | GND | Ground reference for all logic and output stages; decoupling required near pin |
| 19 | CLK | Clock input; rising-edge sensitive; synchronous latch point for all eight D inputs |
| 20 | VCC | +5-V supply; powers BiCMOS core and output drivers; requires local 0.1-µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Process | Combines bipolar speed (70-MHz fmax) with CMOS quiescent power efficiency (ICC ≤ 80 µA typical) |
| Limited Output Swing | 0 V to 3.7 V (not rail-to-rail) - suppresses VCC bounce and EMI in dense PCB layouts |
| SCR Latch-Up Resistance | Rated per JEDEC JESD78 - ensures robustness against transient-induced latch-up in noisy environments |
| Buffered Inputs | High noise immunity (VIH = 2 V, VIL = 0.8 V) and low input capacitance (Ci = 10 pF) |
| Input/Output Isolation | VCC-independent OE and D/Q pins - prevents supply coupling into signal paths during power sequencing |
Applications
| Microprocessor Bus Interface | I/O Port Expansion |
|---|---|
Use Scenario: Interfacing 8-bit microcontroller data bus to peripheral memory or peripherals with timing margins. IC Role / Device Role / Timing Role: Acts as a transparent, edge-triggered latch synchronizing asynchronous peripheral writes onto the CPU bus. Use Value: Enables clean bus sharing using OE-controlled tristate outputs-no pull-ups or direction-control logic needed. |
Use Scenario: Expanding GPIO count on legacy 8-bit controllers where native ports are insufficient. IC Role / Device Role / Timing Role: Provides synchronized, glitch-free output latching with independent OE control per port bank. Use Value: Delivers 48-mA drive strength per pin-directly drives LEDs, relays, or optocouplers without external drivers. |
| Bidirectional Data Transceiver | Industrial Control Register |
Use Scenario: Implementing half-duplex RS-485 or CAN physical layer data buffering with direction control. IC Role / Device Role / Timing Role: Functions as a controlled bidirectional bus driver using OE to switch between transmit/receive states. Use Value: 3.7-V output swing reduces common-mode noise injection-critical for EMC-compliant fieldbus designs. |
Use Scenario: Storing sensor status or actuator commands in programmable logic controllers (PLCs) with deterministic update timing. IC Role / Device Role / Timing Role: Serves as a clock-synchronized working register holding real-time I/O state between scan cycles. Use Value: 2-ns setup/hold times ensure reliable capture from slow industrial sensors even at max clock rate. |
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 |
|---|---|---|---|
| SN74F374N | Same 20-pin DIP, TTL-compatible, but higher ICC (40 mA typical) and lower sink current (24 mA) | Lacks BiCMOS EMI suppression; unsuitable for high-noise industrial bus lines | Prefer CD74FCT374E when EMI reduction or 48-mA drive is required |
| 74ACT374PC | Advanced CMOS, 5-V only, 24-mA sink, no output voltage limiting | Higher VOH (4.9 V) increases VCC bounce risk; not SCR latch-up rated | Choose CD74FCT374E for latch-up immunity and controlled output swing in safety-critical control systems |
Compared with SN74F374N and 74ACT374PC, the CD74FCT374E uniquely combines 48-mA drive, 3.7-V EMI-optimized output swing, and SCR latch-up resistance-making it the preferred choice for noise-sensitive, high-reliability 5-V bus interface designs.
Availability
CD74FCT374E is available at Aetrix Electronics and suitable for microprocessor bus interface, I/O port expansion, and industrial control register applications requiring stable component supply and long-term obsolescence management.
Supply support for CD74FCT374E 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The CD74FCT374E belongs to TI's FCT logic family-designed specifically for high-speed, low-noise 5-V TTL-compatible bus interfacing with enhanced robustness and EMI control.
FAQ
What is the recommended power-up sequence for CD74FCT374E?
TI recommends tying OE to VCC via a pullup resistor (value determined by driver sink capability) to ensure outputs enter high-impedance state at power-up. VCC must stabilize before applying CLK or data signals. The CD74FCT374E does not require specific sequencing between VCC and GND, but uncontrolled OE during ramp-up may cause bus contention. Always verify OE state before enabling CLK in the CD74FCT374E design.
Does CD74FCT374E support hot insertion or live bus swapping?
No-CD74FCT374E is not hot-swap rated. Its absolute maximum ratings specify VCC from –0.5 V to 6 V, but no current-limiting or slew-rate control is built in for insertion under bias. Applying VCC while bus lines are active risks latch-up or output-stage damage. For live-swappable systems, use dedicated hot-swap controllers upstream of the CD74FCT374E.
Can CD74FCT374E drive a 50-pF load at 70 MHz reliably?
Yes-the CD74FCT374E's switching characteristics are characterized with CL = 50 pF and specify tpd ≤ 10 ns and tdis ≤ 8 ns under those conditions. Its 48-mA sink capability and controlled edge rates ensure signal integrity across 50-pF loads at full 70-MHz operation, provided proper VCC decoupling and layout practices are followed.
Is CD74FCT374E pin-compatible with CD74HC374?
No-CD74FCT374E and CD74HC374 share identical pinout (20-pin DIP), but differ electrically: CD74FCT374E has TTL-compatible inputs (VIH = 2 V), 3.7-V VOH, and 48-mA drive; CD74HC374 has CMOS inputs (VIH = 3.5 V), rail-to-rail VOH, and only 4-mA drive. Swapping them requires redesigning drive strength and level-shifting-CD74FCT374E is not a drop-in replacement.
What is the thermal performance of CD74FCT374E in the E package?
The CD74FCT374E in the E package has θJA = 69°C/W. At maximum recommended ICC (80 µA static + dynamic contribution), junction temperature rise remains well below 100°C ambient. For sustained 70-MHz operation with multiple outputs switching, derating is advised above 50°C ambient-TI confirms full specification compliance from 0°C to 70°C ambient for the CD74FCT374E.
CD74FCT374E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 70 MHz
- Max Propagation Delay @ V, Max CL:
- 6.6ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 15mA, 48mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74FCT374E FAQ
1.How can I place an order for CD74FCT374E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT374E 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 CD74FCT374E reliable?
The price and inventory of CD74FCT374E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT374E is usually 5 days.
3.What payment methods are accepted for CD74FCT374E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT374E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT374E?
CD74FCT374E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT374E 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 CD74FCT374E?
For technical support, including CD74FCT374E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT374E requirements.
6.How does Aetrix verify that CD74FCT374E is sourced from the original manufacturer or authorized distributors?
All CD74FCT374E 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 CD74FCT374E meets industry standards.
7.What is the process for return or replacement of CD74FCT374E?
All CD74FCT374E units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT374E, 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 CD74FCT374E part is unused and in its original packaging.
Return procedure for CD74FCT374E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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