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Texas Instruments CY74FCT823CTQC
- Part No.:
- CY74FCT823CTQC
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
CY74FCT823CTQC.pdf
- Description:
- BUS DRIVER, FCT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
CY74FCT823CTQC from Texas Instruments is a 9-bit bus-interface register with positive-edge-triggered D-type flip-flops, 3-state outputs, and buffered clock-enable (EN) and asynchronous-clear (CLR) inputs. It delivers 64 mA sink / 32 mA source drive, supports partial-power-down via Ioff, and operates at 5 V with TTL-compatible input/output levels. It is used in high-performance microprogrammed systems for parity bus interfacing and output port buffering.
For engineers reviewing the CY74FCT823CTQC datasheet, CY74FCT823CTQC pinout, CY74FCT823CTQC application, or CY74FCT823CTQC equivalent, key selection criteria include propagation delay (6 ns max), 3-state output control timing (tPZL/tPHZ = 7 ns), Ioff-enabled power-down safety, matched rise/fall times, and QSOP-24 package compatibility with legacy FCT logic families.
Technical Context
This device implements nine independent D-type flip-flops synchronized to the rising edge of CP, with shared EN (clock enable) and CLR (asynchronous clear) controls. All outputs are 3-state, enabled by OE, and feature edge-rate control circuitry to reduce switching noise.
It is fully specified for partial-power-down operation: when VCC = 0 V, Ioff limits reverse current to ±1 µA, preventing backflow damage. Input thresholds meet TTL standards (VIL ≤ 0.8 V, VIH ≥ 2.0 V), and output VOH/VOL are guaranteed under 32 mA sourcing and 64 mA sinking loads at VCC = 4.75–5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 9-bit positive-edge-triggered D-type register with 3-state outputs |
| Propagation Delay (tPLH/tPHL) | 6 ns max at CL = 50 pF - enables sub-100 MHz synchronous bus operation |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive buses without external buffers |
| Ioff Support | ±1 µA max at VCC = 0 V - prevents backfeed current during system power sequencing |
| Supply Voltage Range | 4.75 V to 5.25 V - ensures stable TTL/CMOS interface compliance across industrial temperature range |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and computing applications |
| Input Compatibility | Fully TTL-compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - interoperable with legacy 5 V logic families |
Pinout & Package
Package: QSOP-24 (DBQ), 3.9 mm × 8.7 mm body, 0.635 mm pitch, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D8 | Data inputs | Asynchronous parallel data inputs to corresponding D-type flip-flops |
| Y0–Y8 | 3-state register outputs | True outputs; high-impedance when OE = high |
| CP | Clock input | Positive-edge-triggered master clock for all 9 bits |
| EN | Clock enable | When high, blocks data capture on CP edges; no state change occurs |
| CLR | Asynchronous clear | Active-low; forces all Q outputs low regardless of CP or EN state |
| OE | Output enable | Active-low; controls 3-state output drivers (low = enabled, high = Hi-Z) |
| VCC | Power supply | +5 V supply pin (Pin 23) |
| GND | Ground | Reference ground (Pin 12) |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduced EMI and crosstalk in dense PCB layouts via slew-limited switching |
| Matched rise/fall times | Minimizes duty-cycle distortion in clocked data paths and improves signal integrity |
| TTL-compatible I/O levels | Direct interoperation with legacy 5 V microcontrollers, FPGAs, and ASICs without level shifters |
| ESD protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 requirements |
| Low input capacitance | 5–10 pF typical - reduces loading on upstream drivers and preserves timing margins |
Applications
| Parity Bus Interface | Microprogrammed System Output Port |
|---|---|
|
Use Scenario: Adding 9-bit parity path between CPU and memory controller in high-speed microprogrammed architectures. IC Role / Device Role / Timing Role: Parallel register latching parity bits synchronously with address/data transfers using CP edge and EN gating. Use Value: Eliminates need for discrete latch+buffer combinations; 64 mA drive sustains signal integrity across 15 cm FR4 traces loaded with 30 pF per stub. |
Use Scenario: Providing programmable I/O expansion in industrial PLC mainboards requiring hot-swap-safe peripheral control. IC Role / Device Role / Timing Role: Output port buffer with asynchronous reset (CLR) and 3-state isolation (OE) for safe module insertion/removal. Use Value: Ioff support prevents backfeed during partial power-down; tPZL = 7 ns enables fast bus release before reconfiguration. |
| High-Capacitance Address Bus Driver | TTL-Compatible Data Path Buffer |
|
Use Scenario: Driving 50+ pF address bus in legacy 80x86-based embedded controllers with multi-drop routing. IC Role / Device Role / Timing Role: Wide-bus register with edge-rate control to suppress ringing on long traces while maintaining setup/hold margins. Use Value: 6 ns propagation delay and matched tPLH/tPHL ensure <1 ns skew across all 9 bits - critical for address decode timing closure. |
Use Scenario: Interfacing FPGA I/O banks to 5 V peripheral peripherals (ADCs, DACs, displays) in mixed-voltage systems. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation register with OE-controlled tristate for bidirectional handshake protocols. Use Value: TTL-compatible inputs accept FPGA 3.3 V LVTTL outputs directly; 32 mA VOH ensures valid HIGH at 5 V bus receivers. |
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 |
|---|---|---|---|
| SN74FCT823CTSOCT | Same logic function, SOIC-24 package; 46°C/W θJA vs. 61°C/W for QSOP; identical AC/DC specs | Better thermal performance in high-density layouts; requires larger PCB footprint than QSOP | Select when board space allows SOIC and thermal margin is prioritized over compactness |
| 74AC823PC | CMOS family; higher VOH (≥4.4 V), lower IOL (24 mA), no Ioff; 10 ns max tPD; not TTL-input compatible | Lacks partial-power-down capability and robust 64 mA drive; unsuitable for legacy TTL bus termination | Only consider for new 5 V CMOS-only designs where Ioff and high sink current are not required |
Compared with SN74FCT823CTSOCT, CY74FCT823CTQC offers superior board-area efficiency in space-constrained modules; compared with 74AC823PC, it provides essential Ioff protection and industrial-grade drive strength for mixed-technology bus interfacing.
Availability
CY74FCT823CTQC is available at Aetrix Electronics and suitable for industrial control systems, microprogrammed computing platforms, and legacy 5 V bus expansion applications requiring stable component supply and long-term lifecycle continuity.
Supply support for CY74FCT823CTQC 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 decades of heritage in industrial-grade logic families.
CY74FCT823CTQC belongs to the FCT logic series designed for high-speed, low-noise, TTL-compatible 5 V bus interfacing in mission-critical industrial and computing systems.
FAQ
What is the maximum clock frequency supported by CY74FCT823CTQC?
CY74FCT823CTQC has a maximum propagation delay of 6 ns (tPLH/tPHL) under CL = 50 pF conditions, supporting reliable operation up to approximately 83 MHz in synchronous bus applications. Real-world frequency limits depend on board layout, load capacitance, and setup/hold timing margins - design validation at target clock rates is recommended.
Does CY74FCT823CTQC support partial-power-down mode, and how is it implemented?
Yes, CY74FCT823CTQC supports partial-power-down via its Ioff circuitry. When VCC = 0 V, Ioff limits reverse current to ±1 µA, preventing damaging backflow through powered inputs or outputs. This enables safe hot-insertion and power sequencing in modular systems - a key requirement confirmed in the datasheet's absolute maximum and recommended operating conditions tables.
What are the voltage thresholds for TTL-compatible inputs on CY74FCT823CTQC?
CY74FCT823CTQC guarantees TTL-compatible input thresholds: VIL ≤ 0.8 V (max) for logic LOW and VIH ≥ 2.0 V (min) for logic HIGH, tested across –40°C to +85°C and VCC = 4.75–5.25 V. These values ensure interoperability with standard 5 V TTL outputs without level translation.
Can CY74FCT823CTQC be used as a direct replacement for CY74FCT823ATQC or CY74FCT823BTQC?
CY74FCT823CTQC is the fastest speed grade (6 ns max tPD) in the CY74FCT823T family and is pin- and function-compatible with CY74FCT823ATQC (10 ns) and CY74FCT823BTQC (7.5 ns). All share identical pinout, DC specs, and functional behavior - only AC timing differs. Substitution is electrically safe but may require timing revalidation in marginal setups.
What package type and lead finish does CY74FCT823CTQC use?
CY74FCT823CTQC uses a QSOP-24 (DBQ) package measuring 3.9 mm × 8.7 mm with 0.635 mm lead pitch. Its lead finish is Green (RoHS compliant, no Sb/Br), with CU NIPDAU plating and JEDEC MSL Level-2-260°C-1 year moisture sensitivity rating - suitable for standard reflow assembly processes.
CY74FCT823CTQC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CY74FCT823CTQC FAQ
1.How can I place an order for CY74FCT823CTQC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT823CTQC 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 CY74FCT823CTQC reliable?
The price and inventory of CY74FCT823CTQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT823CTQC is usually 5 days.
3.What payment methods are accepted for CY74FCT823CTQC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT823CTQC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT823CTQC?
CY74FCT823CTQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT823CTQC 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 CY74FCT823CTQC?
For technical support, including CY74FCT823CTQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT823CTQC requirements.
6.How does Aetrix verify that CY74FCT823CTQC is sourced from the original manufacturer or authorized distributors?
All CY74FCT823CTQC 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 CY74FCT823CTQC meets industry standards.
7.What is the process for return or replacement of CY74FCT823CTQC?
All CY74FCT823CTQC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT823CTQC, 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 CY74FCT823CTQC part is unused and in its original packaging.
Return procedure for CY74FCT823CTQC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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