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Texas Instruments CY74FCT823ATQCT
- Part No.:
- CY74FCT823ATQCT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT823ATQCT.pdf
- Description:
- IC FF D-TYPE SNGL 9BIT 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,642
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Product details
Overview
CY74FCT823ATQCT from Texas Instruments is a 9-bit positive-edge-triggered bus-interface register with 3-state outputs, clock-enable (EN) and asynchronous clear (CLR) inputs, designed for high-capacitance load drive in parity bus interfacing and output port applications. It delivers 64 mA sink and 32 mA source output drive, operates at 5 V ±5%, and features Ioff support for partial-power-down mode.
For engineers reviewing the CY74FCT823ATQCT datasheet, CY74FCT823ATQCT pinout, CY74FCT823ATQCT application, or CY74FCT823ATQCT equivalent, this device is selected for TTL-compatible 9-bit data path buffering where low-noise edge-rate control, matched rise/fall times, and high-impedance bus isolation are required.
Technical Context
This device implements nine D-type flip-flops with common clock (CP), buffered EN and CLR inputs, and individual 3-state output control via OE. All inputs accept TTL logic levels, and outputs drive to VOH = 3.3 V (typ) and VOL = 0.55 V (max) at full load.
The Ioff circuitry disables outputs when VCC = 0 V, preventing backflow current during partial power-down. Edge-rate control reduces switching noise, while matched tPLH/tPHL (10 ns max at CL = 50 pF) ensures clean signal integrity in high-speed parallel interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 9-bit D-type register with 3-state outputs, positive-edge CP, active-low CLR and OE, and EN-controlled data latching |
| Supply Voltage | 4.75 V to 5.25 V - ensures compatibility with standard 5 V TTL and FCT systems without level-shifting |
| Output Drive | 64 mA sink / 32 mA source - supports direct driving of heavy capacitive buses up to 50 pF with minimal voltage droop |
| Propagation Delay | tPLH/tPHL ≤ 10 ns (CL = 50 pF) - enables reliable operation in sub-100 MHz synchronous bus environments |
| Ioff Support | ±1 µA max at VCC = 0 V - guarantees safe isolation during hot-insertion or mixed-voltage domain sequencing |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements without external protection |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and telecom infrastructure applications |
Pinout & Package
Package: 24-pin SSOP (DBQ), 0.154" body width, RoHS-compliant, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-high control: drives all Y outputs to high-impedance when high; enables true register data when low |
| 2–10 (D0–D8) | Data Inputs | Asynchronous parallel inputs to nine D-type flip-flops; TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) |
| 11 (CLR) | Asynchronous Clear | Active-low reset: forces all Q outputs low regardless of CP or EN state when asserted |
| 12 (GND) | Ground Reference | Primary return path for all input/output currents and internal logic; must be low-inductance connection |
| 13 (VCC) | Power Supply | 5 V supply rail; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin |
| 14–22 (Y0–Y8) | 3-State Outputs | Registered, buffered outputs with high-impedance state; each capable of 64 mA sink/32 mA source |
| 23 (EN) | Clock Enable | Active-low gating: allows data transfer on CP↑ only when low; holds outputs unchanged when high |
| 24 (CP) | Clock Input | Positive-edge-triggered master clock; accepts TTL-level transitions; minimum pulse width 6 ns |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Reduced di/dt minimizes simultaneous switching noise (SSN) on shared VCC/GND planes and improves signal integrity |
| Matched Rise/Fall Times | tr ≈ tf ≤ 8 ns (CL = 50 pF) - eliminates duty-cycle distortion in clocked data paths |
| TTL-Compatible I/O | Accepts standard TTL input thresholds and drives to VOH = 3.3 V (typ) - interoperable with legacy 5 V logic families |
| Low Input Capacitance | Ci ≤ 10 pF - reduces loading on upstream drivers and preserves timing margins in fan-out-heavy designs |
| High-Impedance Output Isolation | IOZL/IOZH ≤ ±10 µA - maintains bus integrity during tri-state periods with negligible leakage current |
Applications
| Parity Bus Interface | Microprogrammed System I/O Port |
|---|---|
|
Use Scenario: Adding 9-bit parity generation/correction capability to a 32-bit or 64-bit address/data bus in a microcoded controller. IC Role / Device Role / Timing Role: Acts as a synchronized, enable-gated parity register that captures and holds parity bits aligned with main data transfers. Use Value: Eliminates need for discrete latch + buffer combinations; provides single-package 9-bit registration with 3-state bus isolation during idle cycles. |
Use Scenario: Implementing a programmable output port in an industrial PLC CPU module requiring high-current drive and hot-swap safety. IC Role / Device Role / Timing Role: Serves as a buffered, asynchronously cleared output latch with Ioff-enabled power-down isolation. Use Value: Delivers 64 mA per output to drive LEDs, relays, or optocouplers directly; prevents backfeed during partial system shutdown. |
| High-Speed Address Latching | TTL-to-FCT Bus Bridge |
|
Use Scenario: Capturing and holding address bits between a fast microprocessor and slower peripheral memory or I/O devices. IC Role / Device Role / Timing Role: Functions as a low-skew, edge-triggered address register with independent clock-enable control for burst-mode addressing. Use Value: Achieves tsu = 4 ns and th = 2 ns setup/hold margins at 50 MHz bus rates; supports precise address strobing without external timing logic. |
Use Scenario: Interfacing legacy TTL-based subsystems (e.g., older test equipment or instrumentation) with modern FCT-based control logic. IC Role / Device Role / Timing Role: Provides level- and timing-transparent bridging with identical input thresholds and output drive strength as TTL, but enhanced noise immunity. Use Value: Enables drop-in replacement of AM29823 or 74F823 without layout changes; edge-rate control suppresses crosstalk in mixed-technology backplanes. |
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 |
|---|---|---|---|
| CY74FCT823CTQCT | Faster 6 ns propagation delay (vs. 10 ns); higher ICCD (0.12 mA/MHz vs. 0.06 mA/MHz); same pinout and function | Better suited for >80 MHz clock domains; increased dynamic power draw limits use in thermally constrained modules | Select CY74FCT823CTQCT when timing margin is critical and thermal headroom permits higher dynamic current. |
| SN74F823N | 7.5 ns max tPLH/tPHL; no Ioff support; 24-pin PDIP package; lower ESD rating (1500-V HBM) | Lacks partial-power-down capability; incompatible with hot-swap or mixed-supply systems; requires through-hole PCB assembly | Choose SN74F823N only for legacy through-hole designs where Ioff and surface-mount are not required. |
Compared with CY74FCT823CTQCT and SN74F823N, the CY74FCT823ATQCT offers optimal balance of noise immunity, power-down safety, and surface-mount compatibility for industrial embedded systems operating at moderate clock speeds (≤50 MHz) with strict reliability requirements.
Availability
CY74FCT823ATQCT is available at Aetrix Electronics and suitable for parity bus interfacing, microprogrammed system I/O ports, and high-speed address latching requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for CY74FCT823ATQCT 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications electronics.
The CY74FCT823ATQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise 5 V TTL-compatible bus interfacing in mission-critical industrial and telecom infrastructure systems.
FAQ
What is the maximum clock frequency supported by CY74FCT823ATQCT?
The CY74FCT823ATQCT does not specify a maximum clock frequency in its datasheet; instead, it guarantees timing parameters at defined loads. With tPLH/tPHL ≤ 10 ns and tsu/th ≤ 4 ns/2 ns (CL = 50 pF), the CY74FCT823ATQCT reliably supports synchronous operation up to approximately 50 MHz in typical PCB layouts with controlled impedance traces and proper decoupling.
Does CY74FCT823ATQCT support hot-swap or partial-power-down operation?
Yes, the CY74FCT823ATQCT includes Ioff circuitry that disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This feature enables safe insertion/removal in live backplanes and supports partial-power-down modes in multi-rail systems - a key differentiator from non-Ioff alternatives like SN74F823N.
What are the recommended decoupling practices for CY74FCT823ATQCT?
TI recommends placing a 0.1 µF ceramic capacitor between VCC (pin 13) and GND (pin 12) within 10 mm of the CY74FCT823ATQCT package. For systems with multiple devices or high switching activity, add a bulk 4.7 µF–10 µF tantalum or aluminum electrolytic capacitor near the power entry point to stabilize the 5 V rail feeding the CY74FCT823ATQCT and adjacent logic.
Can CY74FCT823ATQCT drive standard TTL loads directly?
Yes, the CY74FCT823ATQCT is fully compatible with TTL input and output logic levels: it accepts VIH ≥ 2 V and VIL ≤ 0.8 V, and drives VOH ≥ 2.4 V (at –15 mA) and VOL ≤ 0.55 V (at 64 mA). Its 64 mA sink capability exceeds standard TTL fan-out requirements, enabling direct interface without external buffers.
Is CY74FCT823ATQCT pin-compatible with CY74FCT823CTQCT?
Yes, CY74FCT823ATQCT and CY74FCT823CTQCT share identical 24-pin SSOP (DBQ) packaging, pin assignments, and functional logic. The only differences are speed grade (10 ns vs. 6 ns propagation delay) and dynamic current consumption - making them direct drop-in replacements where timing margins allow.
CY74FCT823ATQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 20ns @ 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-SSOP
CY74FCT823ATQCT FAQ
1.How can I place an order for CY74FCT823ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT823ATQCT 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 CY74FCT823ATQCT reliable?
The price and inventory of CY74FCT823ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT823ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT823ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT823ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT823ATQCT?
CY74FCT823ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT823ATQCT 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 CY74FCT823ATQCT?
For technical support, including CY74FCT823ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT823ATQCT requirements.
6.How does Aetrix verify that CY74FCT823ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT823ATQCT 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 CY74FCT823ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT823ATQCT?
All CY74FCT823ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT823ATQCT, 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 CY74FCT823ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT823ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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