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Texas Instruments CY74FCT823ATPC
- Part No.:
- CY74FCT823ATPC
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
CY74FCT823ATPC.pdf
- Description:
- IC FF D-TYPE SNGL 9BIT 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,253
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Product details
Overview
CY74FCT823ATPC 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, 10 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 output port buffering.
For engineers reviewing the CY74FCT823ATPC datasheet, CY74FCT823ATPC pinout, CY74FCT823ATPC application, or CY74FCT823ATPC equivalent, key selection criteria include its 24-pin PDIP package, 10 ns speed grade, Ioff-enabled partial-power-down capability, matched rise/fall times, and edge-rate control for noise immunity in high-capacitance bus environments.
Technical Context
This device implements nine independent D-type flip-flops synchronized to the rising edge of CP, with shared EN and CLR controls. Its 3-state Y outputs are enabled by OE, supporting bus isolation during hold or clear operations.
The internal architecture includes edge-rate control circuitry to limit slew rate and reduce simultaneous switching noise, plus Ioff circuitry that disables outputs when VCC = 0 V to prevent backflow current-enabling safe operation in partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 10 ns max (CP to Y, CL = 50 pF); enables timing-critical bus synchronization at ≤100 MHz system clocks. |
| Output Drive | 64 mA sink / 32 mA source per pin; drives heavy capacitive loads without external buffers. |
| Ioff Support | Active at VCC = 0 V; blocks reverse current flow during partial power-down, protecting powered subsystems. |
| Logic Compatibility | Fully TTL-compatible inputs/outputs; interfaces directly with legacy 5 V logic families without level shifters. |
| Supply Voltage | 4.75–5.25 V; operates within standard 5 V ±5% rail tolerance for industrial and computing applications. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM; meets JEDEC JESD22 standards for robust board-level handling. |
| Operating Temperature | –40°C to +85°C; qualified for extended-temperature industrial and embedded control environments. |
Pinout & Package
Package: 24-pin plastic dual in-line package (PDIP), 0.600-inch body width, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-low control: asserts high-impedance state on all Y outputs when high; enables true data when low. |
| 2–10 (D0–D8) | Data Inputs | Asynchronous parallel data inputs to nine D-type flip-flops; sampled on CP rising edge when EN = low. |
| 11 (CLR) | Asynchronous Clear Input | Active-low reset: forces all Q and Y outputs low regardless of CP or EN state when asserted. |
| 12 (GND) | Ground Reference | Primary signal and power return path; must be low-impedance for stable noise performance. |
| 13 (VCC) | Power Supply | +5 V supply input; decoupling capacitor required near pin for transient current delivery. |
| 14–22 (Y0–Y8) | 3-State Register Outputs | True outputs of registered data; tri-stated when OE = high; driven low/high when OE = low and CP edge occurs. |
| 23 (EN) | Clock Enable Input | Active-low gate: allows data transfer only when low; holds output state unchanged when high. |
| 24 (CP) | Clock Pulse Input | Positive-edge-triggered master clock; initiates sampling of D inputs and update of Y outputs when EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Control | Controlled output slew rate reduces simultaneous switching noise (SSN) and improves signal integrity on shared buses. |
| Matched Rise/Fall Times | Minimizes duty cycle distortion in clocked data paths, preserving timing margins in synchronous systems. |
| Partial-Power-Down Support | Ioff circuitry ensures zero backflow current when VCC = 0 V, enabling hot-swap and mixed-voltage domain designs. |
| TTL-Compatible I/O | Accepts and drives standard TTL voltage thresholds (VIH = 2.0 V min, VOL = 0.55 V max), eliminating interface logic. |
| Buffered Control Inputs | EN and CLR inputs are internally buffered to reduce loading on upstream drivers and improve fanout capability. |
Applications
| Parity Bus Interface | Microprogrammed Controller Output Port |
|---|---|
Use Scenario: Adding 9-bit parity generation/checking capability to wide address/data buses in microcoded control units. IC Role / Device Role / Timing Role: Acts as a synchronized, 3-state buffered register holding parity bits; clocked by microinstruction execution cycle. Use Value: Eliminates need for discrete latches and buffers; provides deterministic setup/hold timing (tsu = 4 ns, th = 2 ns) for reliable parity validation. | Use Scenario: Driving high-current peripheral control signals (e.g., memory enable, I/O strobes) from a microprogrammed sequencer. IC Role / Device Role / Timing Role: Functions as an output latch with active-low OE for bus arbitration and EN-controlled update gating. Use Value: Delivers 64 mA sink per output to directly drive LEDs, relays, or TTL inputs without external drivers. |
| High-Capacitance Bus Buffer | Legacy System Bus Expansion |
Use Scenario: Interfacing a low-capacitance processor bus to a long, heavily loaded backplane or daughterboard trace. IC Role / Device Role / Timing Role: Provides low-input-capacitance (Ci = 5–10 pF) and low-output-capacitance (Co = 9–12 pF) buffering with controlled edge rates. Use Value: Reduces signal degradation and crosstalk via edge-rate control and matched transitions, extending usable bus length. | Use Scenario: Upgrading aging 5 V TTL-based instrumentation or industrial controllers with additional register capacity. IC Role / Device Role / Timing Role: Serves as drop-in compatible replacement for AM29823 and FCT-family registers in existing PCB layouts. Use Value: Maintains identical pinout and logic behavior while improving noise immunity and power-down safety over legacy parts. |
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 |
|---|---|---|---|
| CY74FCT823BTPC | 7.5 ns propagation delay (vs. 10 ns); higher speed grade with same 24-pin PDIP package and Ioff support. | Suitable where tighter timing margins are required (e.g., faster microcode cycles or shorter bus traces). | Select when system clock period demands sub-10 ns register latency and layout supports identical footprint. |
| SN74FCT823APC | Same 10 ns speed grade and PDIP-24 package; identical pinout and function but manufactured by TI under legacy FCT branding. | No functional or timing deviation; fully interchangeable in legacy designs using SN74FCT823A part numbers. | Choose for BOM continuity where SN74FCT823APC is already qualified and documented in existing schematics. |
Compared with CY74FCT823BTPC, the CY74FCT823ATPC trades 2.5 ns of speed for broader margin in noisy or thermally stressed environments; versus SN74FCT823APC, it offers identical performance with updated manufacturing traceability and RoHS-compliant materials.
Availability
CY74FCT823ATPC is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and microprogrammed logic applications requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.
Supply support for CY74FCT823ATPC 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 CY74FCT823ATPC belongs to TI's FCT logic family-designed specifically for high-speed, low-noise 5 V bus interfacing in microprogrammed and control-oriented systems with strict power-down safety requirements.
FAQ
What is the maximum clock frequency supported by CY74FCT823ATPC?
The CY74FCT823ATPC does not specify a maximum clock frequency in its datasheet. Instead, it guarantees a maximum propagation delay of 10 ns (CP to Y, CL = 50 pF) and minimum pulse widths (tw = 6 ns for CP and CLR). Based on these timing parameters, the device supports reliable operation up to approximately 50 MHz in typical 50 pF load conditions. For precise system-level timing analysis, designers must verify setup/hold (tsu = 4 ns, th = 2 ns) and propagation delays against their specific clock tree and load configuration. The CY74FCT823ATPC is optimized for synchronous bus control-not continuous high-frequency streaming.
Does CY74FCT823ATPC support hot-swap or partial-power-down operation?
Yes, CY74FCT823ATPC supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the Ioff circuitry disables all outputs, preventing damaging current backflow from live bus lines into the unpowered device. This capability enables safe insertion/removal in powered-backplane systems and mixed-voltage domain designs. The CY74FCT823ATPC is explicitly specified for partial-power-down applications per its datasheet, and ESD ratings (2000-V HBM) further support robust handling during such operations.
What are the key differences between CY74FCT823ATPC and CY74FCT823BTPC?
The primary difference between CY74FCT823ATPC and CY74FCT823BTPC lies in propagation delay: CY74FCT823BTPC has a 7.5 ns max tPLH/tPHL (CL = 50 pF), while CY74FCT823ATPC is rated at 10 ns. Both share identical 24-pin PDIP packaging, Ioff support, pinout, and electrical specifications (VOH/VOL, drive strength, temperature range). The CY74FCT823ATPC offers relaxed timing margins suited for cost-sensitive or noise-prone applications, whereas CY74FCT823BTPC targets higher-speed microprogrammed systems. Neither part requires PCB changes when substituted.
Can CY74FCT823ATPC drive standard TTL loads directly?
Yes, CY74FCT823ATPC is fully compatible with standard TTL logic levels. Its VOH (min 2.0 V at IOH = –32 mA) and VOL (max 0.55 V at IOL = 64 mA) meet or exceed TTL output requirements, and its VIH (min 2.0 V) and VIL (max 0.8 V) accept standard TTL input thresholds. With 64 mA sink and 32 mA source capability per output, the CY74FCT823ATPC can directly drive multiple TTL inputs (fanout ≥20) without external buffers-making it ideal for legacy system integration and bus expansion.
Is CY74FCT823ATPC RoHS compliant and lead-free?
Yes, CY74FCT823ATPC is RoHS compliant and lead-free. Per TI's Packaging Information Addendum (Feb 2020), the CY74FCT823ATPC ordering variant uses "Green (RoHS & no Sb/Br)" material content with "NIPDAU" (nickel-palladium-gold) lead finish. It meets current EU RoHS requirements for all 10 restricted substances, including lead < 0.1% by weight in homogeneous materials. The device is qualified for lead-free soldering processes with MSL Level-2-260°C-1 year rating, confirming full compliance for modern manufacturing.
CY74FCT823ATPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
CY74FCT823ATPC FAQ
1.How can I place an order for CY74FCT823ATPC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT823ATPC 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 CY74FCT823ATPC reliable?
The price and inventory of CY74FCT823ATPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT823ATPC is usually 5 days.
3.What payment methods are accepted for CY74FCT823ATPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT823ATPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT823ATPC?
CY74FCT823ATPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT823ATPC 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 CY74FCT823ATPC?
For technical support, including CY74FCT823ATPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT823ATPC requirements.
6.How does Aetrix verify that CY74FCT823ATPC is sourced from the original manufacturer or authorized distributors?
All CY74FCT823ATPC 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 CY74FCT823ATPC meets industry standards.
7.What is the process for return or replacement of CY74FCT823ATPC?
All CY74FCT823ATPC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT823ATPC, 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 CY74FCT823ATPC part is unused and in its original packaging.
Return procedure for CY74FCT823ATPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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