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Texas Instruments CY74FCT823CTSOCT
- Part No.:
- CY74FCT823CTSOCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT823CTSOCT.pdf
- Description:
- IC FF D-TYPE SNGL 9BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,957
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Product details
Overview
CY74FCT823CTSOCT from Texas Instruments is a 9-bit bus-interface register with 3-state outputs, positive-edge-triggered D-type flip-flops, buffered clock-enable (EN) and asynchronous clear (CLR), and TTL-compatible I/O logic levels. It delivers 64 mA sink / 32 mA source drive, 6 ns propagation delay (tPLH/tPHL at CL = 50 pF), and supports partial-power-down via Ioff. It is used in high-performance microprogrammed systems for parity bus interfacing and high-current output port applications.
For engineers reviewing the CY74FCT823CTSOCT datasheet, CY74FCT823CTSOCT pinout, CY74FCT823CTSOCT application, or CY74FCT823CTSOCT equivalent, key selection criteria include 9-bit parallel register functionality, 3-state bus isolation, Ioff-enabled partial power-down, edge-rate controlled noise immunity, and SOIC-24 package compatibility with legacy FCT/AM29823 designs.
Technical Context
This device implements nine independent D-type flip-flops synchronized to the rising edge of CP, with shared EN and CLR control inputs. Its 3-state outputs are managed by OE, enabling bidirectional bus loading control and high-impedance isolation during idle cycles.
The internal edge-rate control circuitry limits slew rate to reduce simultaneous switching noise, while matched rise/fall times ensure clean signal integrity. Ioff protection disables all outputs when VCC = 0 V, preventing backflow current during system power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 6 ns max (tPLH/tPHL, CL = 50 pF) - enables timing-critical 9-bit data latching in high-speed microprogrammed buses |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads without external buffers in parity/data bus applications |
| Ioff Support | Active at VCC = 0 V - prevents damaging backflow current during partial power-down, critical for hot-swap and mixed-voltage systems |
| Input Compatibility | TTL-level VIH = 2 V, VIL = 0.8 V - interoperates directly with legacy TTL and CMOS logic without level-shifting |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and operation |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including embedded control and telecom infrastructure |
| Supply Voltage | 4.75 V to 5.25 V - tightly regulated 5 V tolerance ensures stable register behavior across line and load variations |
Pinout & Package
Package: SOIC-24 (DW), 7.5 mm × 15.4 mm body, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9 | D0–D8 | Asynchronous data inputs to nine D-type flip-flops - accepts parallel bus data prior to clock edge |
| 10 | OE | Output enable control - high = 3-state (Z), low = active true outputs - enables bus sharing and contention avoidance |
| 11 | CLR | Asynchronous clear - low forces all Q/Y outputs to logic low regardless of clock or enable state - resets register independently of CP |
| 12 | GND | Ground reference - common return path for all logic and output currents |
| 13 | VCC | Positive supply - powers internal logic and output drivers at 4.75–5.25 V |
| 14–22 | Y0–Y8 | 3-state registered outputs - reflect D-input values on CP↑ when EN = low and OE = low - drive external buses directly |
| 23 | EN | Clock enable - low permits data transfer on CP↑; high holds Q/Y outputs unchanged - provides gated clocking without external logic |
| 24 | CP | Clock pulse input - rising edge triggers synchronous capture of D inputs into flip-flops - defines register update timing boundary |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Control | Controlled output slew rate reduces simultaneous switching noise (SSN) and improves signal integrity on dense PCBs |
| Matched Rise/Fall Times | Ensures symmetrical waveform edges, minimizing duty-cycle distortion in clocked bus interfaces |
| Reduced VOH (Typ. 3.3 V) | Lower high-level output voltage improves noise margin against 3.3 V logic thresholds while maintaining 5 V compatibility |
| Function & Pin Compatibility | Direct replacement for AM29823 and FCT-family 9-bit registers - no PCB redesign required for drop-in upgrades |
| Low Input Capacitance | 5–10 pF typical Ci - minimizes loading on upstream drivers, preserving timing margins in fan-out-critical paths |
Applications
| Parity Bus Interface | High-Current Output Port |
|---|---|
|
Use Scenario: Adding 9-bit parity generation/correction capability to a 32-bit or 64-bit address/data bus in a microprogrammed controller. IC Role / Device Role / Timing Role: Synchronizes parity bits with main data path using shared CP and EN, isolating parity bus via OE during non-active cycles. Use Value: Eliminates need for discrete buffers or additional register packages, reducing BOM count and layout area while ensuring timing-aligned parity updates. |
Use Scenario: Driving high-capacitance backplane traces or multiple downstream receivers in industrial I/O modules. IC Role / Device Role / Timing Role: Acts as a latched, 3-state output port with asynchronous reset - holds steady-state signals until next CP edge. Use Value: Delivers 64 mA per output to meet MIL-STD-883 or IEC 61000-4-2 surge test requirements without external drivers. |
| Partial-Power-Down System | TTL-to-5V Bus Isolation |
|
Use Scenario: Power-gating subsystems in multi-rail embedded systems where CPU core remains active but peripheral buses are temporarily disabled. IC Role / Device Role / Timing Role: Ioff circuitry disables Y outputs when VCC drops to 0 V - prevents reverse current flow from powered bus segments. Use Value: Enables safe hot-swap and dynamic power management without risk of latch-up or damage to adjacent powered ICs. |
Use Scenario: Interfacing legacy TTL peripherals (e.g., 74LS series) with modern 5 V CMOS microcontrollers in mixed-logic systems. IC Role / Device Role / Timing Role: Provides level-tolerant inputs (VIH = 2 V, VIL = 0.8 V) and robust 5 V outputs compatible with TTL fan-out requirements. Use Value: Removes need for discrete level shifters or resistor networks, simplifying interconnect and improving noise immunity over long traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bus-interface register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT823ATSOCT | 10 ns max propagation delay (vs. 6 ns); same pinout, Ioff, and drive strength | Suitable for less timing-critical systems where lower speed suffices and cost sensitivity favors older speed grade | Select when tPLH/tPHL ≤ 10 ns satisfies system timing budget and price is prioritized over maximum speed |
| SN74FCT823CTSOCT | Identical electrical specs and pinout; TI rebranded part number with same DW package and marking FCT823C | No functional difference - used interchangeably in TI's documentation and distribution channels | Choose based on distributor stock availability; identical performance and qualification for all CY74FCT823CTSOCT use cases |
Compared with CY74FCT823ATSOCT, the CY74FCT823CTSOCT offers 40% faster propagation delay for tighter timing margins, while SN74FCT823CTSOCT provides identical functionality under an alternate TI part numbering scheme-both preserve pin compatibility, Ioff support, and 3-state bus control without layout changes.
Availability
CY74FCT823CTSOCT is available at Aetrix Electronics and suitable for high-reliability industrial control, telecom infrastructure, and embedded computing applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for CY74FCT823CTSOCT 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 for industrial, automotive, and communications markets.
The CY74FCT823T family was designed specifically for high-speed, noise-immune bus interfacing in microprogrammed systems - emphasizing 3-state isolation, partial-power-down safety, and TTL/CMOS interoperability.
FAQ
What is the maximum clock frequency supported by CY74FCT823CTSOCT?
CY74FCT823CTSOCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees setup/hold timing (tsu = 3 ns, th = 1.5 ns) and propagation delay (tPLH/tPHL = 6 ns). System-level maximum frequency depends on external load and board layout, but designs commonly operate up to 80 MHz with CL = 50 pF. The CY74FCT823CTSOCT is optimized for synchronous bus latching rather than continuous high-frequency toggling.
Does CY74FCT823CTSOCT support hot-swap or live-insertion?
Yes, CY74FCT823CTSOCT supports hot-swap via its Ioff feature: when VCC = 0 V, the outputs are disabled and leakage is limited to ±1 µA, preventing damaging current backflow from live buses. This allows safe insertion/removal in powered-backplane systems. However, OE and CLR must be held inactive (OE = high, CLR = high) during insertion to avoid transient glitches - CY74FCT823CTSOCT requires proper power-sequencing control for full hot-swap compliance.
Can CY74FCT823CTSOCT drive a 100-pF bus capacitance reliably?
Yes, CY74FCT823CTSOCT maintains specified timing (tPLH/tPHL ≤ 12.5 ns) and output voltage levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V) at CL = 300 pF per output, well above 100 pF. Its 64 mA sink capability ensures fast edge rates even under heavy capacitive loads. For CY74FCT823CTSOCT, driving 100 pF introduces <1 ns additional delay versus 50 pF - within most system timing budgets.
Is CY74FCT823CTSOCT pin-compatible with the AM29823?
Yes, CY74FCT823CTSOCT is functionally and pin-compatible with the AMD AM29823 9-bit register. Both share identical pin assignments (D0–D8, Y0–Y8, CP, EN, CLR, OE, VCC, GND), electrical interface (TTL-compatible inputs, 3-state outputs), and logic behavior. CY74FCT823CTSOCT serves as a direct drop-in replacement with improved noise characteristics and Ioff support - no PCB or firmware changes are needed.
What is the purpose of the edge-rate control circuitry in CY74FCT823CTSOCT?
The edge-rate control circuitry in CY74FCT823CTSOCT intentionally limits output slew rate to reduce simultaneous switching noise (SSN) and electromagnetic interference (EMI). By slowing transitions just enough to meet timing specs, it suppresses high-frequency harmonics that cause ground bounce and crosstalk - especially critical in dense, high-pin-count SOIC-24 layouts. This design choice makes CY74FCT823CTSOCT suitable for noise-sensitive applications like telecom backplanes and precision instrumentation.
CY74FCT823CTSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- 12.5ns @ 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
CY74FCT823CTSOCT FAQ
1.How can I place an order for CY74FCT823CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT823CTSOCT 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 CY74FCT823CTSOCT reliable?
The price and inventory of CY74FCT823CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT823CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT823CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT823CTSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT823CTSOCT?
CY74FCT823CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT823CTSOCT 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 CY74FCT823CTSOCT?
For technical support, including CY74FCT823CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT823CTSOCT requirements.
6.How does Aetrix verify that CY74FCT823CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT823CTSOCT 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 CY74FCT823CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT823CTSOCT?
All CY74FCT823CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT823CTSOCT, 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 CY74FCT823CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT823CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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