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Texas Instruments CY74FCT821BTSOCE4
- Part No.:
- CY74FCT821BTSOCE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT821BTSOCE4.pdf
- Description:
- IC FF D-TYPE SNGL 10BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,578
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Product details
Overview
CY74FCT821BTSOCE4 from Texas Instruments is a 10-bit bus-interface register with 3-state outputs, designed for high-capacitance load drive in address/data bus buffering applications. It features positive-edge-triggered D-type flip-flops, 7.5 ns propagation delay (tPLH/tPHL at CL = 50 pF), 64 mA sink / 32 mA source output drive, and Ioff support for partial-power-down mode operation.
For engineers reviewing the CY74FCT821BTSOCE4 datasheet, CY74FCT821BTSOCE4 pinout, CY74FCT821BTSOCE4 application, or CY74FCT821BTSOCE4 equivalent, key selection criteria include 3-state bus isolation timing, TTL-compatible input/output levels, edge-rate control for noise suppression, and SOIC-24 package compatibility with industrial temperature range (–40°C to 85°C).
Technical Context
This device implements ten independent D-type flip-flops synchronized to the rising edge of CP, with asynchronous 3-state control via OE. Its architecture supports simultaneous latching and bus release without contention, enabled by matched rise/fall times and low-output capacitance (9–12 pF).
The Ioff circuitry actively disables outputs when VCC = 0 V, limiting backflow current to ±1 µA, while edge-rate control reduces ground bounce and crosstalk in high-speed parallel interfaces. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels (VOH = 2.4 V min at –15 mA, VOL = 0.55 V max at 64 mA) ensure full TTL logic compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 10-bit positive-edge-triggered bus-interface register with 3-state outputs |
| Propagation Delay | 7.5 ns max (CP to Y, CL = 50 pF) - enables reliable 133 MHz bus operation |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads without external buffers |
| Ioff Support | ±1 µA max backflow at VCC = 0 V - enables safe hot-insertion and partial power-down |
| Logic Compatibility | Fully TTL-input and TTL-output compatible - interoperable with legacy 5-V systems |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial reliability requirements |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments |
Pinout & Package
Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, 1.27 mm pitch, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | D0–D9 | Data inputs to D-type flip-flops; accept TTL-level signals |
| 11 | OE | Active-low 3-state output enable; high = high-impedance Y outputs |
| 12 | GND | Ground reference for all internal logic and I/O |
| 13–22 | Y0–Y9 | 3-state registered outputs; low-capacitance (9–12 pF) bus drivers |
| 23 | CP | Positive-edge clock input; latches Dn on rising transition |
| 24 | VCC | 5-V supply (4.75–5.25 V); powers logic core and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Control | Reduces switching noise and ground bounce in dense PCB layouts |
| Matched Rise/Fall Times | Minimizes duty-cycle distortion in clocked data paths |
| TTL-Compatible I/O | Eliminates level-shifting components in mixed-voltage 5-V systems |
| Low Input Capacitance | 5–10 pF per input - reduces loading on upstream drivers |
| High-Impedance Output State | IOZH/IOZL ≤ ±10 µA - ensures clean bus sharing across multiple devices |
Applications
| Memory Address Latching | Parallel I/O Port Expansion |
|---|---|
Use Scenario: Latching 10-bit address segments for SRAM or EPROM access in microcontroller-based systems. IC Role / Device Role / Timing Role: Acts as a synchronous address latch, capturing stable address bits on CP rising edge before memory access cycle begins. Use Value: Enables deterministic timing margin between CPU address valid and memory enable, reducing setup/hold violations on wide buses. | Use Scenario: Expanding GPIO count on industrial PLC controllers using shared data bus architecture. IC Role / Device Role / Timing Role: Functions as an output port buffer with tri-state control, allowing multiple peripherals to share one data bus. Use Value: Provides 64 mA sink capability per output to directly drive LEDs, relays, or optocouplers without external drivers. |
| Bus Isolation in Backplane Systems | Legacy System Bus Buffering |
Use Scenario: Isolating fault domains in modular instrumentation backplanes where modules may be hot-swapped. IC Role / Device Role / Timing Role: Serves as a controlled bus interface with Ioff-enabled power-down during module removal. Use Value: Prevents backfeed current into unpowered slots, eliminating risk of damage to adjacent powered modules. | Use Scenario: Upgrading aging 8-bit ISA bus peripherals to support wider data paths without redesigning motherboard logic. IC Role / Device Role / Timing Role: Replaces discrete latch+buffer combinations with single 10-bit register offering reduced board space and skew. Use Value: Delivers 7.5 ns tPLH/tPHL and matched edges - maintains signal integrity across 10-bit parallel paths at 133 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus-interface register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT821CTSOC | 6 ns propagation delay (vs. 7.5 ns), higher speed grade; identical pinout and function | Suitable for designs requiring tighter timing margins or higher clock rates up to 166 MHz | Select when system timing budget demands sub-7 ns CP-to-Y delay |
| SN74FCT821ATSOCT | 10 ns propagation delay, lower drive (48 mA sink / 24 mA source), same SOIC-24 package | Optimized for lower-power, cost-sensitive industrial controls where 100 MHz operation suffices | Choose for reduced dynamic power consumption and relaxed thermal design |
Compared with CY74FCT821BTSOCE4, CY74FCT821CTSOC offers faster timing but identical functionality and layout compatibility, while SN74FCT821ATSOCT trades speed and drive strength for lower ICCD (0.06 mA/MHz vs. 0.12 mA/MHz), making it preferable in thermally constrained or battery-backed subsystems.
Availability
CY74FCT821BTSOCE4 is available at Aetrix Electronics and suitable for industrial control panels, legacy bus upgrade projects, and embedded memory interface designs requiring stable component supply over extended production lifecycles.
Supply support for CY74FCT821BTSOCE4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions across industrial, automotive, and communications markets.
The CY74FCT821x series belongs to TI's FCT logic family, engineered specifically for robust 5-V bus interfacing with enhanced noise immunity, Ioff protection, and TTL compatibility in mission-critical industrial systems.
FAQ
What is the maximum clock frequency supported by CY74FCT821BTSOCE4?
CY74FCT821BTSOCE4 supports a maximum operating frequency of approximately 133 MHz, derived from its 7.5 ns maximum propagation delay (tPLH/tPHL) under CL = 50 pF conditions. This assumes sufficient setup (4 ns) and hold (2 ns) time margins for D-input stability relative to CP rising edge. Actual system frequency depends on board layout, load capacitance, and signal integrity.
Does CY74FCT821BTSOCE4 support hot-swap or partial-power-down operation?
Yes, CY74FCT821BTSOCE4 includes Ioff circuitry that limits reverse current to ±1 µA when VCC = 0 V, enabling safe partial-power-down and hot-swap capability. This prevents damaging backflow through outputs when the device is unpowered but connected to an active bus, satisfying industrial backplane and modular system requirements.
What are the absolute maximum ratings for CY74FCT821BTSOCE4 supply voltage and I/O pins?
CY74FCT821BTSOCE4 has an absolute maximum supply voltage rating of –0.5 V to 7 V, and DC input/output voltage range of –0.5 V to 7 V. Exceeding these values risks permanent damage. Recommended operating VCC is strictly 4.75–5.25 V; operation outside this window may cause functional failure or accelerated wear.
How does the edge-rate control in CY74FCT821BTSOCE4 improve system noise performance?
CY74FCT821BTSOCE4 incorporates internal edge-rate control circuitry that moderates output slew rate without compromising propagation delay. This significantly reduces ground bounce, crosstalk, and EMI in high-density PCBs-especially critical when driving multiple loads on shared buses or long traces, as confirmed by JESD22 ESD test results and application note SCCS033B.
Is CY74FCT821BTSOCE4 pin-compatible with other members of the CY74FCT821x family?
Yes, CY74FCT821BTSOCE4 is fully pin-compatible with CY74FCT821ATSOC, CY74FCT821CTSOC, and CY74FCT821BTPC across all packages (SOIC, QSOP, DIP). All variants share identical pin functions, electrical behavior, and timing architecture-only speed grade (6/7.5/10 ns), drive strength, and thermal characteristics differ.
CY74FCT821BTSOCE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- 15ns @ 5V, 300pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 200 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CY74FCT821BTSOCE4 FAQ
1.How can I place an order for CY74FCT821BTSOCE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT821BTSOCE4 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 CY74FCT821BTSOCE4 reliable?
The price and inventory of CY74FCT821BTSOCE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT821BTSOCE4 is usually 5 days.
3.What payment methods are accepted for CY74FCT821BTSOCE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT821BTSOCE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT821BTSOCE4?
CY74FCT821BTSOCE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT821BTSOCE4 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 CY74FCT821BTSOCE4?
For technical support, including CY74FCT821BTSOCE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT821BTSOCE4 requirements.
6.How does Aetrix verify that CY74FCT821BTSOCE4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT821BTSOCE4 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 CY74FCT821BTSOCE4 meets industry standards.
7.What is the process for return or replacement of CY74FCT821BTSOCE4?
All CY74FCT821BTSOCE4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT821BTSOCE4, 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 CY74FCT821BTSOCE4 part is unused and in its original packaging.
Return procedure for CY74FCT821BTSOCE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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