My Inquiry
My Account
Texas Instruments CD74FCT654EN
- Part No.:
- CD74FCT654EN
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CD74FCT654EN.pdf
- Description:
- BUS TRANSCEIVER, FCT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:225
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD74FCT654EN from Texas Instruments is a BiCMOS octal bus transceiver and register with open-collector outputs on the A bus and 3-state outputs on the B bus, supporting real-time or stored-data multiplexing in 5-V TTL-compatible systems. It features 64-mA sink capability, 80-MHz clock frequency, noninverted signal paths, and input/output isolation from VCC, enabling robust bidirectional data routing in industrial control backplanes.
For engineers reviewing the CD74FCT654EN datasheet, CD74FCT654EN pinout, CD74FCT654EN application, or CD74FCT654EN equivalent, key selection criteria include its dual-register architecture, simultaneous A/B bus storage capability, controlled edge rates for EMI reduction, and compatibility with legacy 5-V TTL logic families in legacy system upgrades and test equipment interfaces.
Technical Context
The CD74FCT654EN integrates two independent D-type flip-flop registers-one per bus-with separate clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls. Its BiCMOS process combines bipolar speed with CMOS low quiescent power, limiting high-level output swing to 3.7 V to suppress VCC bounce and EMI during simultaneous switching.
Real-time transfer mode allows direct pass-through without latching; stored-data mode enables synchronized capture of A- or B-bus inputs on clock edges regardless of OE/S state. The device eliminates multiplexer glitches during mode transitions via glitch-free select logic, and supports isolated bus hold using OEAB/OEBA high with all other sources in high-Z.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within standard 5-V TTL rail tolerances |
| Max Clock Frequency | 80 MHz - supports high-speed synchronous data transfer between buses |
| Output Sink Current | 64 mA per A-side pin - drives heavy loads including multiple TTL inputs or pull-up networks |
| Propagation Delay | 2 ns to 9 ns - guarantees timing compliance in fast 5-V digital systems with tight setup/hold margins |
| Input Transition Rate | 0–10 ns/V - accommodates standard TTL edge speeds without false triggering |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and instrumentation environments |
| Output Voltage Swing | 0 V to 3.7 V - reduces power-bus ringing and ground bounce versus full-rail CMOS |
Pinout & Package
CD74FCT654EN uses a 24-pin plastic dual in-line package (PDIP-EN), with 0.3-inch body width and through-hole mounting. Pin numbering follows standard DIP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLKAB) | Active-high clock for A→B register | Triggers storage of A-bus data into B-side register on rising edge |
| 2 (SAB) | Select control for A→B path | Low = real-time A-to-B transfer; high = stored A-data to B bus |
| 3 (OEAB) | Output enable for A-bus drivers | Low = enable open-collector A outputs; high = high-Z state |
| 4–11 (A1–A8) | A-bus I/O terminals | Open-collector outputs; also accept inputs for register loading |
| 12 (GND) | Ground reference | Common return for all internal circuitry and I/O |
| 13 (VCC) | Power supply | 5-V supply with SCR latch-up-resistant BiCMOS process |
| 14 (CLKBA) | Active-high clock for B→A register | Triggers storage of B-bus data into A-side register on rising edge |
| 15 (SBA) | Select control for B→A path | Low = real-time B-to-A transfer; high = stored B-data to A bus |
| 16 (OEBA) | Output enable for B-bus drivers | Low = enable 3-state B outputs; high = high-Z state |
| 17–24 (B1–B8) | B-bus I/O terminals | 3-state outputs; also accept inputs for register loading |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free multiplexing | Select-control logic prevents transient invalid states during real-time ↔ stored-data mode transitions |
| Dual independent registers | Separate CLKAB/SAB/OEAB and CLKBA/SBA/OEBA controls allow asynchronous A- and B-bus storage |
| EMI-optimized output swing | Limited 3.7-V high-level output reduces power-bus ringing and improves signal integrity in dense PCB layouts |
| Input/output isolation from VCC | Prevents current injection during overvoltage or hot-insertion events, enhancing system robustness |
| Buffered inputs | Reduces capacitive loading on upstream drivers and maintains timing predictability across temperature |
Applications
| Industrial Backplane Interface | Legacy System Data Multiplexing |
|---|---|
Use Scenario: Bidirectional data routing between CPU and peripheral modules in programmable logic controllers with shared address/data buses. IC Role / Device Role / Timing Role: Bus transceiver and register managing time-multiplexed access to memory-mapped I/O while preserving data integrity during arbitration. Use Value: Enables deterministic real-time data transfer and snapshot-based diagnostics via stored register contents without external latch logic. |
Use Scenario: Interfacing modern microcontrollers to legacy 5-V TTL peripherals requiring both immediate pass-through and buffered data staging. IC Role / Device Role / Timing Role: Dual-role interface IC providing selectable real-time or registered data flow between mismatched subsystems. Use Value: Eliminates need for discrete latches and multiplexers, reducing component count and board space in retrofit designs. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Configurable signal path management in automated test equipment where stimulus and response signals must be gated, delayed, or latched. IC Role / Device Role / Timing Role: Synchronized bus transceiver capturing parallel test vectors on clock edges and routing them under select control. Use Value: Supports precise timing alignment of stimulus generation and response capture using internal register staging and glitch-free mode switching. |
Use Scenario: Controlling multiple DUT interfaces from a single controller bus in production test fixtures with mixed timing requirements. IC Role / Device Role / Timing Role: Register-based bus repeater isolating controller timing from variable DUT response delays. Use Value: Allows independent clocking of A- and B-bus sides to accommodate asynchronous DUT handshaking while maintaining data coherency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F543N | Octal transparent latch + 3-state transceiver; no open-collector outputs or dual-select logic | Lacks real-time/stored-data multiplexing; requires external logic for glitch-free mode switching | Choose when only unidirectional registered transfer is needed and open-collector drive is unnecessary |
| 74ACT16541 | 16-bit version with identical BiCMOS architecture but no open-collector outputs; 3-state only on both sides | Higher channel count but no A-side sink capability; incompatible pinout and register control scheme | Choose for wider bus widths where 3-state-only operation suffices and higher integration is prioritized |
Compared with SN74F543N and 74ACT1651, the CD74FCT654EN uniquely combines open-collector A outputs, dual independent registers, and glitch-free select logic-enabling compact, self-contained bidirectional multiplexing without external glue logic or level-shifting components.
Availability
CD74FCT654EN is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, and automated test fixture designs requiring stable component supply and long-term obsolescence support.
Supply support for CD74FCT654EN 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, performance, and broad application support.
The CD74FCT654EN belongs to TI's FCT logic family-designed specifically for high-speed, low-noise 5-V TTL-compatible interfacing in industrial, computing, and test equipment where EMI control and register-assisted data staging are critical.
FAQ
What is the primary function of the CD74FCT654EN in a digital system?
The CD74FCT654EN serves as an octal bidirectional bus transceiver with integrated D-type registers, enabling either real-time data transfer or synchronized storage and retrieval between two 8-bit buses. Its dual-register architecture and independent select/enable controls allow it to manage complex data routing scenarios-such as CPU-peripheral arbitration or test stimulus/response staging-without external latches or multiplexers. This makes the CD74FCT654EN especially valuable in systems where timing determinism and signal integrity are critical.
Does the CD74FCT654EN support both 3-state and open-collector outputs simultaneously?
Yes-the CD74FCT654EN provides open-collector outputs on the A bus (pins A1–A8) and 3-state outputs on the B bus (pins B1–B8). This hybrid configuration allows the A side to drive wired-OR networks or interface with higher-voltage logic, while the B side offers clean, low-capacitance bus driving with fast enable/disable transitions. The CD74FCT654EN achieves this using a BiCMOS process that combines bipolar output stages for high sink current with CMOS input and control logic for low power and noise immunity.
What is the significance of the 3.7-V output voltage swing limit in the CD74FCT654EN?
The CD74FCT654EN limits its high-level output voltage to approximately 3.7 V-two diode drops below VCC-to reduce power-bus ringing, VCC bounce, and ground bounce during simultaneous output switching. This design choice directly lowers electromagnetic interference (EMI) in densely routed PCBs and improves signal integrity in noise-sensitive applications like test equipment and industrial control. The CD74FCT654EN maintains full TTL-compatible logic thresholds despite the reduced swing, ensuring interoperability with standard 5-V logic families.
Can the CD74FCT654EN store data without using its internal registers?
Yes-the CD74FCT654EN supports a "bus-hold" mode where real-time transfer occurs without register involvement: when SAB and SBA are both low (real-time mode) and OEAB and OEBA are simultaneously enabled, each bus reinforces its own inputs. With all other drivers in high-Z, the A and B buses retain their last driven states. This behavior is intrinsic to the CD74FCT654EN's architecture and does not require clocking or register enablement, offering a low-latency alternative to registered operation for simple bus isolation tasks.
Is the CD74FCT654EN still in active production?
No-the CD74FCT654EN is marked as OBSOLETE by Texas Instruments per its official packaging addendum. However, Aetrix Electronics maintains verified legacy inventory with full traceability and supports extended lifecycle requirements for industrial and defense customers. Engineering validation, functional testing, and documentation alignment for the CD74FCT654EN remain available to ensure seamless integration into existing designs requiring exact form-fit-function replacement.
CD74FCT654EN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD74FCT654EN FAQ
1.How can I place an order for CD74FCT654EN through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT654EN 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 CD74FCT654EN reliable?
The price and inventory of CD74FCT654EN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT654EN is usually 5 days.
3.What payment methods are accepted for CD74FCT654EN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT654EN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74FCT654EN?
CD74FCT654EN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT654EN 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 CD74FCT654EN?
For technical support, including CD74FCT654EN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT654EN requirements.
6.How does Aetrix verify that CD74FCT654EN is sourced from the original manufacturer or authorized distributors?
All CD74FCT654EN 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 CD74FCT654EN meets industry standards.
7.What is the process for return or replacement of CD74FCT654EN?
All CD74FCT654EN units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT654EN, 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 CD74FCT654EN part is unused and in its original packaging.
Return procedure for CD74FCT654EN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD74FCT654EN Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
