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Texas Instruments CY74FCT652TQCT
- Part No.:
- CY74FCT652TQCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT652TQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
CY74FCT652TQCT from Texas Instruments is an 8-bit registered transceiver with 3-state outputs, designed for bidirectional data bus isolation and synchronized storage in TTL/CMOS mixed-signal systems. It features independent A/B register clocks (CPAB/CPBA), dual select controls (SAB/SBA), and 3-state enable inputs (GAB/GBA), supporting real-time or stored-data transfer. Key specs include 9 ns max propagation delay, 64 mA sink / 32 mA source drive, and Ioff partial-power-down protection.
For engineers reviewing the CY74FCT652TQCT datasheet, CY74FCT652TQCT pinout, CY74FCT652TQCT application, or CY74FCT652TQCT equivalent, this device is selected for high-noise-margin bus interfacing in industrial control backplanes, legacy system upgrades requiring FCT-compatible timing, and applications needing glitch-free multiplexed data routing between registered and transparent paths.
Technical Context
The CY74FCT652TQCT implements dual 8-bit D-type flip-flop registers with asynchronous 3-state output control, enabling simultaneous or staggered capture of A- and B-bus data. Its edge-rate control circuitry limits slew rate to suppress switching noise, while matched rise/fall times ensure clean signal integrity across all 16 I/Os.
Functionally, it supports four distinct operational modes: real-time A→B or B→A transfer, stored-A→B or stored-B→A transfer, and concurrent A/B register loading. The Ioff specification guarantees ≤±1 µA leakage when VCC = 0 V, allowing safe back-driving during partial power-down sequences without damaging current flow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 1.5–9 ns - Enables sub-100 MHz synchronous bus operation with deterministic timing margins. |
| Output Drive Strength | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., >50 pF) and multiple TTL inputs without external buffers. |
| Supply Voltage Range | 4.75–5.25 V - Matches standard 5 V TTL/CMOS rails; rejects ±2.5% supply variation. |
| Ioff Leakage Current | ±1 µA at VCC = 0 V - Prevents back-current damage during hot-insertion or partial power-down in modular systems. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - Fully compatible with TTL logic levels, eliminating level-shifter requirements. |
| 3-State Enable Time (tPZH/tPZL) | 1.5–14 ns - Ensures fast bus release for time-critical arbitration protocols like shared-memory access. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments including factory automation and telecom line cards. |
Pinout & Package
Package: 24-pin SSOP (DBQ), 0.154" body width, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CPAB) | A-to-B register clock | Low-to-high transition latches A-bus data into internal DFFs for later stored-transfer mode. |
| 2 (SAB) | A-to-B select control | High = route stored A-data to B-bus; Low = route real-time A-data to B-bus. |
| 3 (GAB) | A-to-B output enable | Low = enable A→B 3-state outputs; High = high-impedance (isolates B-bus). |
| 4–11 (A1–A8) | A-bus data I/O | Bi-directional pins: input when GAB=H/GBA=L; output when GAB=L/GBA=H. |
| 12 (GND) | Ground reference | Primary return path for all digital logic and I/O currents; must be low-inductance connection. |
| 13 (VCC) | Power supply | +5 V supply for core logic and output drivers; requires local 0.1 µF ceramic decoupling. |
| 14 (CPBA) | B-to-A register clock | Low-to-high transition latches B-bus data into internal DFFs for stored-transfer mode. |
| 15 (SBA) | B-to-A select control | High = route stored B-data to A-bus; Low = route real-time B-data to A-bus. |
| 16 (GBA) | B-to-A output enable | Low = enable B→A 3-state outputs; High = high-impedance (isolates A-bus). |
| 17–24 (B1–B8) | B-bus data I/O | Bi-directional pins: input when GBA=H/GAB=L; output when GBA=L/GAB=H. |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free select control | Eliminates decoding glitches during SAB/SBA transitions-ensures no spurious bus contention during mode switching. |
| Edge-rate controlled outputs | Controlled slew rate reduces EMI and crosstalk in dense PCB layouts with parallel buses. |
| Dual independent register clocks | CPAB and CPBA allow asynchronous capture of A- and B-bus data without interlock timing constraints. |
| Multiplexed real-time/stored transfer | Single device replaces discrete mux + latch combinations-reduces component count and layout area. |
| TTL-compatible input thresholds | Accepts standard TTL VIH (2.0 V min) and VIL (0.8 V max), enabling direct interface with legacy 74LS/ALS logic. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, noise-immune data handoff between master and slave modules with precise clock-domain boundary control. Use Value: Eliminates bus contention during hot-swap events using Ioff and 3-state isolation, while maintaining <9 ns latency for deterministic scan-cycle timing. |
Use Scenario: Upgrading 1980s-era test equipment with modern microcontrollers while retaining original TTL-based front-panel logic. IC Role / Device Role / Timing Role: Level- and timing-compatible bridge between new 5 V CMOS MCU and legacy 74LS bus architecture. Use Value: No redesign needed: identical pinout, TTL voltage thresholds, and 5.4–9 ns propagation matches original FCT family timing budgets. |
| Modular Telecom Line Card | Redundant Data Path Controller |
Use Scenario: Managing dual active/standby TDM data paths in carrier-grade access switches with automatic failover. IC Role / Device Role / Timing Role: Dual-register transceiver capturing real-time traffic on primary path and storing backup copy on secondary path under CPAB/CPBA control. Use Value: Enables zero-packet-loss switchover via stored-data transfer mode-critical for voice-grade SLA compliance. |
Use Scenario: Implementing lock-step comparison between two independent sensor acquisition channels in safety-critical avionics. IC Role / Device Role / Timing Role: Simultaneous registration of both channel outputs followed by synchronized 3-state output enable for voting logic. Use Value: Matched tPLH/tPHL ensures sub-nanosecond skew between redundant paths-meets DO-254 timing verification requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT652ATQCT | 6.3 ns max propagation delay (vs. 9 ns); otherwise identical pinout, function, and drive. | Better suited for higher-speed backplanes (>100 MHz clock domains) where tighter timing margins are required. | Select CY74FCT652ATQCT when system timing budget demands ≤6.3 ns tPLH/tPHL; same footprint and firmware. |
| CY74FCT652CTQCT | 5.4 ns max propagation delay; enhanced drive (same 64/32 mA) and lower ICCD dynamic current. | Optimized for high-density, low-power embedded systems with aggressive thermal constraints and multi-GHz bus rates. | Choose CY74FCT652CTQCT for new designs targeting maximum speed and lowest dynamic power; drop-in replacement with improved specs. |
Compared with CY74FCT652TQCT, the AT and CT variants offer progressively faster propagation (6.3 ns → 5.4 ns) and reduced dynamic current, enabling higher clock frequencies and lower system power in timing-critical industrial and telecom applications-without changing PCB layout or control logic.
Availability
CY74FCT652TQCT is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, and telecom line card designs requiring stable component supply across extended product lifecycles.
Supply support for CY74FCT652TQCT 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 50 years of innovation in industrial and automotive electronics.
The CY74FCT652TQCT belongs to TI's 74FCT logic family-designed specifically for robust, noise-immune 5 V bus interfacing in harsh industrial environments where reliability and timing predictability are critical.
FAQ
What is the maximum operating frequency supported by CY74FCT652TQCT?
CY74FCT652TQCT does not specify a maximum clock frequency directly, but its 9 ns maximum propagation delay (tPLH/tPHL) and 6 ns minimum clock pulse width (tw) support reliable operation up to approximately 83 MHz in synchronous bus applications. Real-world usable frequency depends on board trace length, load capacitance, and setup/hold timing margins-designers should verify timing closure using the full parameter set in SCCS032B.
Does CY74FCT652TQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT652TQCT supports partial-power-down via its Ioff feature: when VCC = 0 V, leakage current is limited to ±1 µA per I/O, preventing damaging back-current flow from live buses into the unpowered device. This enables safe insertion/removal in modular systems-provided GAB and GBA are held inactive (high) during power transitions to maintain 3-state isolation.
How does the CY74FCT652TQCT eliminate multiplexer glitches during mode switching?
CY74FCT652TQCT eliminates multiplexer glitches through dedicated select-control circuitry that decouples SAB/SBA transitions from data path switching. Unlike standard muxes, it avoids momentary bus contention by ensuring output state remains valid during select changes-verified in the FUNCTION TABLE where "X" entries indicate no functional dependency on SAB/SBA during clock-triggered store operations.
Can CY74FCT652TQCT operate with mixed 3.3 V and 5 V logic interfaces?
No-CY74FCT652TQCT is a 5 V-only device with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and 5 V output swing. It lacks 3.3 V tolerant inputs or dual-supply capability. Interfacing with 3.3 V systems requires external level-shifting or voltage translation, as confirmed by absolute maximum ratings (VCC range = –0.5 V to 7 V, but recommended operation is strictly 4.75–5.25 V).
What is the purpose of the edge-rate control circuitry in CY74FCT652TQCT?
The edge-rate control circuitry in CY74FCT652TQCT intentionally limits output slew rate to reduce high-frequency harmonic content and electromagnetic interference (EMI). This improves noise immunity in electrically noisy industrial environments and minimizes crosstalk in tightly routed parallel buses-directly contributing to the "significantly improved noise characteristics" cited in the device description.
CY74FCT652TQCT 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
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
CY74FCT652TQCT FAQ
1.How can I place an order for CY74FCT652TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT652TQCT 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 CY74FCT652TQCT reliable?
The price and inventory of CY74FCT652TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT652TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT652TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT652TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT652TQCT?
CY74FCT652TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT652TQCT 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 CY74FCT652TQCT?
For technical support, including CY74FCT652TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT652TQCT requirements.
6.How does Aetrix verify that CY74FCT652TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT652TQCT 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 CY74FCT652TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT652TQCT?
All CY74FCT652TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT652TQCT, 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 CY74FCT652TQCT part is unused and in its original packaging.
Return procedure for CY74FCT652TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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