CY74FCT821ATQCTE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
CY74FCT821ATQCTE4 is a 10-bit tri-state bus driver/flip-flop IC from Texas Instruments with active-low enable control and up to 71.4 MHz operating frequency. It drives 50 pF loads with RoHS-compliant construction in a 24-pin SOIC package. Designed for high-speed digital bus buffering in computing and networking logic systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- CY74FCT821ATQCTE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of CY74FCT821ATQCTE4?
- 10-bit tri-state bus driver with active-low enable and up to 71.4 MHz maximum operating frequency for high-speed logic bus applications
- 50 pF load capacitance rating ensures signal integrity on backplane and board-level buses without external buffers
- 24-pin SOIC package (JESD-30 R-PDSO-G24) with lead-free, RoHS-compliant construction for modern SMT assembly
What is CY74FCT821ATQCTE4 used for?
CY74FCT821ATQCTE4 is used in address and data bus buffering on CPU daughtercards, memory modules, and FPGA development boards where 10 parallel data lines must be driven at speeds up to 71 MHz. Its tri-state outputs allow multiple drivers to share a common bus, and the active-low enable simplifies bus arbitration logic in multi-master systems. The FCT logic family's high sink and source current capability supports capacitively loaded backplane traces common in rack-mounted industrial computers.
What are the specifications of CY74FCT821ATQCTE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | FCT |
| JESD-30 Code | R-PDSO-G24 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max Frequency@Nom-Sup | 71400000Hz |
| Max I(ol) | 0.064A |
| Number of Bits | 10 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP24,.24 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 12.2mA |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 20ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.635mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | POSITIVE EDGE |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| HTS Code | 8542.39.00.60 |
Where can I find the CY74FCT821ATQCTE4 datasheet?
CY74FCT821ATQCTE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CY74FCT821ATQCTE4?
Compatible alternatives and drop-in replacements for CY74FCT821ATQCTE4:
Frequently Asked Questions
What is the maximum operating frequency and load capacitance rating of CY74FCT821ATQCTE4?
CY74FCT821ATQCTE4 operates at a maximum frequency of 71.4 MHz and is rated to drive loads up to 50 pF per output pin. These specifications make it suitable for buffering address and data buses in systems where multiple PCB traces or connector pins present combined capacitances in the 30 pF to 50 pF range at clocks up to 70 MHz. Exceeding 50 pF load increases propagation delay.
How does the tri-state output of CY74FCT821ATQCTE4 simplify multi-master bus designs?
CY74FCT821ATQCTE4's 10-bit tri-state outputs are individually disabled when the active-low enable pin is deasserted, placing all outputs in a high-impedance state. This allows multiple CY74FCT821A devices to share a single 10-bit bus without signal contention, enabling multi-master architectures where only one driver is enabled at any given clock cycle. The unidirectional data flow simplifies bus arbitration compared to bidirectional transceiver designs.
In which computing or networking applications is CY74FCT821ATQCTE4 typically designed in?
CY74FCT821ATQCTE4 is specified in VMEbus backplane buffer cards, ISA and PCI bus address latch circuits, FPGA I/O expansion boards, and legacy industrial single-board computers running at bus frequencies up to 71 MHz. Its 10-bit width matches common byte-plus-parity or 10-bit address sub-bus widths. The FCT family's compatibility with CMOS and TTL input thresholds also supports mixed-logic systems common in legacy industrial computing environments.
Is CY74FCT821ATQCTE4 still in active production, and what package does it use?
CY74FCT821ATQCTE4 has a YTEOL of 0, indicating it is at or near the end of its estimated product lifecycle. It is housed in a 24-pin SOIC (JESD-30 R-PDSO-G24) with 1.27 mm pin pitch and standard SOIC footprint. Designers starting new PCB layouts should evaluate whether an equivalent active FCT-family 10-bit bus driver with the same 24-pin SOIC footprint is available from TI's current active product portfolio before committing to this MPN.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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