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Texas Instruments CD74FCT822AEN
- Part No.:
- CD74FCT822AEN
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CD74FCT822AEN.pdf
- Description:
- BUS DRIVER, FCT SERIES
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Inventory:2,070
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Product details
Overview
CD74FCT822AEN from Texas Instruments is a BiCMOS 10-bit bus-interface flip-flop with 3-state outputs, designed for driving highly capacitive or low-impedance loads in address/data buses with parity. It features inverted Q outputs, clock-triggered data capture on CLK rising edge, and independent OE-controlled output enable/disable. Key confirmed specs: 48 mA sink current per output, 3.7 V max output swing, 70 MHz max clock frequency, and operation from 0°C to 70°C.
For engineers reviewing the CD74FCT822AEN datasheet, CD74FCT822AEN pinout, CD74FCT822AEN application, or CD74FCT822AEN equivalent, this page delivers verified electrical parameters, functional timing behavior, package-specific terminal mapping, real-world interface use cases, and validated alternative options for bus buffering and register expansion in legacy 5 V TTL-compatible systems.
Technical Context
The CD74FCT822AEN implements a synchronous 10-bit D-type flip-flop array with active-high clock and active-low inverted outputs. Its BiCMOS output stage limits VOH to ~3.7 V (two diode drops below VCC), reducing EMI from power-bus ringing and minimizing VCC/ground bounce during simultaneous switching.
Output-enable (OE) operates independently of clock and data registers, allowing high-impedance state control without disrupting stored data. Input isolation from VCC and SCR latch-up resistance ensure robust operation in noisy industrial environments with mixed-signal coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | FCT-series BiCMOS - combines TTL-compatible input thresholds with CMOS low-power quiescent draw and bipolar drive strength |
| Supply Voltage | 4.75 V to 5.25 V - strict 5 V ±5% tolerance ensures compatibility with legacy TTL and early microprocessor bus systems |
| Max Clock Frequency | 70 MHz - supports high-speed data latching in wide parallel buses without setup/hold violations |
| Output Sink Current | 48 mA per pin - enables direct drive of multiple TTL inputs or moderate-capacitance PCB traces without external buffers |
| Propagation Delay | 1.5 ns to 10 ns (tpd) - guarantees deterministic timing margins in synchronous bus arbitration and register staging |
| Input Clamping | −1.2 V VIK - protects against negative transients common in backplane or hot-swap environments |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded systems and industrial control panels |
Pinout & Package
Packaged in 24-pin plastic dual in-line package (PDIP), with 0.6-inch body width and standard through-hole mounting. Pin 12 is GND, pin 24 is VCC, and all 10 data inputs (1D–10D), 10 inverted outputs (1Q–10Q), CLK, and OE are arranged per TI's EN package drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3–11, 13–21 | 1D–10D, 1Q–10Q | Data inputs and inverted registered outputs - each pair forms one bit of synchronized, polarity-inverted bus storage |
| 2 | OE | Active-high output-enable - places all Q outputs in high-Z state regardless of CLK or D states, enabling bus sharing |
| 22 | CLK | Clock input - triggers synchronous load of all 10 D inputs into respective flip-flops on rising edge only |
| 12 | GND | Ground reference - dedicated return path for logic and output current; decoupling capacitor must be placed adjacent |
| 24 | VCC | Positive supply - powers internal BiCMOS circuitry; output voltage swing capped at 3.7 V to suppress ringing |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process | Combines bipolar speed and drive strength with CMOS low static power - ICC < 80 µA typical at 25°C |
| Inverted outputs | Eliminates need for external inverters in complemented bus architectures (e.g., parity generation paths) |
| Controlled edge rates | Reduces EMI by limiting dV/dt - critical for compliance in unshielded industrial enclosures |
| Undershoot-protection circuitry | Prevents negative voltage excursions below −1.2 V on outputs during fast transitions into capacitive loads |
| SCR latch-up resistance | Withstands transient-induced substrate currents up to ±20 mA without destructive latch-up |
Applications
| Wide Address Bus Register | Parity-Enabled I/O Port |
|---|---|
Use Scenario: Expanding 16-bit or 20-bit address paths in 80Cxx or Z80-based industrial controllers where native CPU address width is insufficient. IC Role / Device Role / Timing Role: Synchronous 10-bit latch providing additional address bits with precise CLK-aligned hold time (2 ns min) and setup time (4 ns min). Use Value: Enables direct connection to memory-mapped peripherals without glue logic, leveraging 48 mA drive to overcome trace capacitance across 6-inch backplane runs. |
Use Scenario: Implementing bidirectional data ports with hardware parity checking in programmable logic controllers (PLCs) using separate even/odd parity lines. IC Role / Device Role / Timing Role: Data register holding bus values during read/write cycles while OE isolates port during arbitration; inverted outputs simplify XOR-based parity generation. Use Value: Reduces component count by integrating 10-bit storage + 3-state control + noise-suppressed outputs - eliminating discrete buffers and level shifters. |
| High-Capacitance Bus Driver | Legacy Microprocessor Working Register |
Use Scenario: Driving long, unterminated ribbon cables (>30 cm) connecting CPU boards to I/O expansion modules in test equipment racks. IC Role / Device Role / Timing Role: Output buffer with controlled slew rate and 3.7 V swing limit - minimizes reflections and ground bounce when 10 lines switch simultaneously. Use Value: Achieves clean signal integrity at 70 MHz without termination resistors, cutting BOM cost and board space vs. discrete MOSFET solutions. |
Use Scenario: Storing intermediate computation results in fixed-point DSP subsystems built around TMS320C2x or similar 1990s-era processors. IC Role / Device Role / Timing Role: Working register holding 10-bit coefficient or status flags, clocked synchronously with CPU bus cycle to avoid metastability. Use Value: Provides deterministic 7.5 ns typical propagation delay (tpd) for timing-critical pipeline stages, with guaranteed 2 ns hold time preventing race conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT822ATPWR | TSSOP-24 package, same electrical specs, RoHS-compliant, MSL-1 rating | Suitable for surface-mount production; lacks through-hole mechanical stability for high-vibration environments | Select when automated assembly and board density outweigh serviceability needs |
| 74AC16374PC | 16-bit, non-inverting, 5 V AC-family; higher ICC (100 µA), no undershoot protection | Broadens data width but requires external inverters for complemented paths; less robust in noisy settings | Choose only if 16-bit width is mandatory and EMI margin is not constrained |
Compared with SN74FCT822ATPWR and 74AC16374PC, the CD74FCT822AEN offers unique value in through-hole reliability, integrated undershoot protection, and inverted-output optimization for parity-aware bus designs - making it irreplaceable where legacy form factor and noise immunity are non-negotiable.
Availability
CD74FCT822AEN is available at Aetrix Electronics and suitable for wide address bus expansion, parity-enabled I/O ports, high-capacitance bus driving, and legacy microprocessor working register applications requiring stable component supply across extended product lifecycles.
Supply support for CD74FCT822AEN 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 CD74FCT822AEN belongs to TI's FCT logic family - engineered for 5 V TTL-compatible systems requiring low-noise, high-drive bus interfacing with enhanced ESD and latch-up resilience.
FAQ
What is the maximum clock frequency supported by the CD74FCT822AEN?
The CD74FCT822AEN supports a maximum clock frequency of 70 MHz under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = 0°C to 70°C). This specification is guaranteed by timing parameter fclock in the datasheet and validated across production lots. The CD74FCT822AEN achieves this performance via its BiCMOS output stage and optimized internal propagation paths, enabling reliable use in high-speed parallel bus applications without violating setup or hold timing windows.
Does the CD74FCT822AEN have true 5 V TTL-compatible inputs?
Yes, the CD74FCT822AEN features TTL-compatible input thresholds: VIH = 2.0 V minimum and VIL = 0.8 V maximum, matching standard 5 V TTL logic families. These values are specified in the "Recommended Operating Conditions" table and verified across temperature and voltage corners. The CD74FCT822AEN maintains this compatibility while delivering BiCMOS advantages - ensuring seamless integration into legacy systems using 74LS, 74ALS, or early microprocessor buses without level-shifting circuitry.
Why is the CD74FCT822AEN's output voltage swing limited to 3.7 V?
The CD74FCT822AEN's output high level is intentionally clamped to approximately 3.7 V - two diode drops below VCC - by its BiCMOS output structure. This design reduces dV/dt during switching, suppressing power-bus ringing and minimizing VCC/ground bounce during simultaneous 10-bit transitions. The CD74FCT822AEN leverages this feature to meet EMI requirements in unshielded industrial enclosures, where full 5 V swings would induce measurable radiated emissions above regulatory limits.
Can the CD74FCT822AEN drive multiple TTL inputs directly?
Yes, the CD74FCT822AEN can drive up to 10 standard TTL unit loads (each ≈ 1.6 mA) per output, thanks to its guaranteed 48 mA sink current and −15 mA source capability. Its output impedance and controlled edge rates maintain signal integrity even when loaded with 50 pF total capacitance, as confirmed in the "Switching Characteristics" section. When used in a system with known fanout requirements, the CD74FCT822AEN eliminates need for external buffer stages in most industrial bus implementations.
Is the CD74FCT822AEN still in active production?
No, the CD74FCT822AEN is marked OBSOLETE by Texas Instruments per the Package Option Addendum dated April 2013. However, Aetrix Electronics maintains legacy inventory and provides traceable, tested units for ongoing maintenance and repair of installed base systems. The CD74FCT822AEN remains fully functional and electrically identical to original TI specifications, with full documentation and application support available for sustaining engineering teams.
CD74FCT822AEN 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:
- -
CD74FCT822AEN FAQ
1.How can I place an order for CD74FCT822AEN through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT822AEN 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 CD74FCT822AEN reliable?
The price and inventory of CD74FCT822AEN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT822AEN is usually 5 days.
3.What payment methods are accepted for CD74FCT822AEN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT822AEN transactions.
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4.How is shipping managed for CD74FCT822AEN?
CD74FCT822AEN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT822AEN 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 CD74FCT822AEN?
For technical support, including CD74FCT822AEN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT822AEN requirements.
6.How does Aetrix verify that CD74FCT822AEN is sourced from the original manufacturer or authorized distributors?
All CD74FCT822AEN 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 CD74FCT822AEN meets industry standards.
7.What is the process for return or replacement of CD74FCT822AEN?
All CD74FCT822AEN units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT822AEN, 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 CD74FCT822AEN part is unused and in its original packaging.
Return procedure for CD74FCT822AEN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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