My Inquiry
My Account
Texas Instruments CY74FCT652CTQCT
- Part No.:
- CY74FCT652CTQCT
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT652CTQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,519
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY74FCT652CTQCT from Texas Instruments is an 8-bit registered transceiver with 3-state outputs, designed for bidirectional data bus isolation and synchronized storage in TTL-compatible systems. It features independent A/B registers, real-time/stored-data multiplexing, 5.4 ns propagation delay (tPLH/tPHL), 64 mA sink / 32 mA source drive strength, and Ioff partial-power-down support. It is used in backplane interface logic, memory address/data bus latching, and dual-bus arbitration circuits.
For engineers reviewing the CY74FCT652CTQCT datasheet, CY74FCT652CTQCT pinout, CY74FCT652CTQCT application, or CY74FCT652CTQCT equivalent, key selection criteria include registered vs. transparent transfer mode, simultaneous clock edge handling, Ioff-enabled system power sequencing, and QSOP-24 package compatibility with high-density PCB layouts.
Technical Context
The CY74FCT652CTQCT implements dual 8-bit D-type flip-flop registers with separate CPAB/CPBA clocks and SAB/SBA select controls, enabling glitch-free switching between real-time and stored data paths. Its edge-rate control circuitry ensures matched rise/fall times and reduced EMI, while the Ioff specification guarantees safe operation during partial power-down with no backflow current.
It supports TTL-level inputs (VIL = 0.8 V, VIH = 2.0 V) and CMOS-compatible outputs (VOH = 3.3 V typ. at IOH = –32 mA, VOL = 0.55 V max. at IOL = 64 mA), operating across –40°C to +85°C with 4.75–5.25 V supply. The device uses positive-logic control: low GAB enables A→B transfer; low GBA enables B→A transfer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | 5.4 ns max (tPLH/tPHL); ensures tight timing margins in 20+ MHz synchronous bus interfaces |
| Output Drive | 64 mA sink / 32 mA source; drives heavy capacitive loads (e.g., >10 pF per line) without signal degradation |
| Ioff Support | ±1 µA max at VCC = 0 V; prevents backfeed current during hot-swap or partial power-down sequences |
| Voltage Compatibility | 4.75–5.25 V supply; fully interoperable with legacy 5 V TTL and mixed-voltage 3.3/5 V systems |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V; guarantees noise immunity and reliable detection of TTL logic levels |
| Package | SSOP-24 (DBQ); 0.635 mm pitch, 8.2 mm × 3.91 mm footprint for space-constrained board designs |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded control and communications equipment |
Pinout & Package
SSOP-24 (DBQ) package with 0.635 mm lead pitch, 8.2 mm × 3.91 mm body size, and exposed pad not present. Pin 1 located at top-left corner (Q1 quadrant), with standard JEDEC SSOP orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CPAB) | A-to-B register clock | Low-to-high edge stores A-bus data into A-side register; functional regardless of GAB/GBA state |
| 2 (SAB) | A-to-B select control | Low = real-time A→B transfer; high = stored A→B transfer; eliminates multiplexer glitches during mode transition |
| 3 (GAB) | A-to-B output enable | Low = enables A→B 3-state outputs; high = high-impedance A-bus drivers |
| 4–11 (A1–A8) | A-bus data I/O | Bidirectional pins: input when GAB = high; output when GAB = low and SAB selects source |
| 12 (GND) | Ground reference | Primary digital ground return for all internal logic and I/O structures |
| 13 (VCC) | Power supply | +5 V supply rail; decoupling required within 1 cm due to fast edge rates and dynamic current demands |
| 14 (CPBA) | B-to-A register clock | Low-to-high edge stores B-bus data into B-side register; independent of GAB/GBA status |
| 15 (SBA) | B-to-A select control | Low = real-time B→A transfer; high = stored B→A transfer; synchronized with SAB for dual-register consistency |
| 16 (GBA) | B-to-A output enable | Low = enables B→A 3-state outputs; high = high-impedance B-bus drivers |
| 17–24 (B1–B8) | B-bus data I/O | Bidirectional pins: input when GBA = high; output when GBA = low and SBA selects source |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-free multiplexing | Select-control logic prevents decoding spikes during real-time ↔ stored-data transitions, eliminating bus contention risks |
| Independent dual-clock registers | CPAB and CPBA accept asynchronous edges; allows staggered or simultaneous A/B data capture without interlock dependency |
| Edge-rate controlled outputs | Controlled slew rate reduces simultaneous switching noise (SSN) and improves signal integrity on shared buses |
| TTL/CMOS mixed-mode compatibility | Accepts TTL input thresholds and delivers CMOS-level VOH/VOL, enabling seamless integration in hybrid logic systems |
| Partial-power-down protection | Ioff circuitry disables outputs at VCC = 0 V, preventing reverse current flow in hot-plug or multi-rail power architectures |
Applications
| Backplane Bus Arbitration | Memory Address Latching |
|---|---|
Use Scenario: Isolating CPU and peripheral address/data buses on a multi-slot industrial backplane where multiple masters contend for shared resources. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free handoff between real-time and stored bus states during arbitration cycles. Use Value: Eliminates metastability and bus contention via independent CPAB/CPBA clocks and SAB/SBA-select arbitration, supporting deterministic timing at >10 MHz bus rates. | Use Scenario: Capturing and holding microprocessor address bus signals for static RAM or EPROM access in embedded controllers with limited address latch count. IC Role / Device Role / Timing Role: Dual-register buffer storing address values on CPAB/CPBA edges while maintaining stable output during memory read/write windows. Use Value: Enables single-cycle address setup with 5.4 ns tPLH, reducing external latch count and PCB routing complexity in space-constrained designs. |
| Dual-Port Memory Interface | Hot-Swappable Module Control |
Use Scenario: Interfacing two independent processors to a shared SRAM bank with separate read/write ports and independent timing domains. IC Role / Device Role / Timing Role: Bidirectional registered transceiver managing A↔B data flow with independent clocking and 3-state isolation between processor domains. Use Value: Prevents bus collisions using GAB/GBA-controlled 3-state outputs and eliminates timing skew via matched rise/fall times and low propagation delay. | Use Scenario: Enabling safe insertion/removal of I/O modules in programmable logic controllers where main power remains active but module rails cycle independently. IC Role / Device Role / Timing Role: Ioff-enabled transceiver maintaining high-impedance isolation during module power-down while preserving bus integrity. Use Value: ±1 µA Ioff leakage prevents backfeed into powered subsystems, meeting IEC 61000-4-2 Level 4 ESD and hot-swap safety 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; identical pinout, function, and Ioff spec | Suitable for lower-speed designs where 5.4 ns timing margin is unnecessary | Select when cost sensitivity outweighs need for fastest timing; same layout and firmware compatibility |
| SN74FCT652CQCT | Same speed grade (5.4 ns), identical logic and pinout; TI rebranded part number with identical DBQ-24 package | No functional difference; used interchangeably in TI-designated BOMs | Valid drop-in replacement with identical electrical, thermal, and mechanical behavior |
Compared with CY74FCT652ATQCT, the CY74FCT652CTQCT delivers tighter 5.4 ns timing for high-throughput bus interfaces; compared with SN74FCT652CQCT, it shares identical performance but reflects Cypress's original product lineage prior to TI acquisition-both are functionally and physically interchangeable in production.
Availability
CY74FCT652CTQCT is available at Aetrix Electronics and suitable for industrial backplane arbitration, memory address latching, dual-port memory interfacing, and hot-swappable module control requiring stable component supply across extended lifecycle programs.
Supply support for CY74FCT652CTQCT 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 CY74FCT652CTQCT belongs to the FCT logic family, engineered for high-speed, low-noise, 5 V TTL-compatible bus interface applications with robust power sequencing and signal integrity requirements.
FAQ
What is the maximum clock frequency supported by CY74FCT652CTQCT for reliable register operation?
The CY74FCT652CTQCT does not specify a maximum clock frequency limit in its datasheet. Instead, it defines minimum pulse width (tw ≥ 5 ns) and setup/hold times (tsu = 2 ns, th = 1.5 ns). Based on these, the device reliably supports clock frequencies up to approximately 100 MHz in typical PCB layouts with proper termination and decoupling, assuming clean edges and minimal skew between CPAB and CPBA signals. The CY74FCT652CTQCT is optimized for synchronous bus applications rather than continuous high-frequency clocking.
Does CY74FCT652CTQCT support live insertion or hot-swap applications?
Yes, the CY74FCT652CTQCT supports hot-swap applications through its Ioff feature. When VCC = 0 V, the Ioff circuitry limits output leakage to ±1 µA, preventing damaging back-current flow from live bus lines into the unpowered device. This capability, combined with 3-state outputs and robust ESD ratings, makes the CY74FCT652CTQCT suitable for modular systems requiring safe field-replaceable unit (FRU) insertion, provided that power sequencing follows TI's recommended guidelines for partial-power-down operation.
Can CY74FCT652CTQCT operate with a 3.3 V supply?
No, the CY74FCT652CTQCT is specified only for 4.75 V to 5.25 V operation. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), output drive characteristics, and internal logic are designed for 5 V TTL/CMOS compatibility. Applying 3.3 V violates the recommended operating conditions and may result in undefined logic states, insufficient noise margin, or failure to meet timing specifications. For 3.3 V systems, consider TI's ALVC or LVC series transceivers instead of the CY74FCT652CTQCT.
How does the CY74FCT652CTQCT handle simultaneous CPAB and CPBA clock edges?
The CY74FCT652CTQCT allows simultaneous low-to-high transitions on CPAB and CPBA to store data on both A and B buses concurrently. The function table explicitly lists "Store A and B data" under GAB = L, GBA = H, and both clocks active. However, when SAB and SBA are both high (stored-data mode), TI recommends staggering the clocks to avoid potential race conditions in dual-register loading - a constraint noted in the datasheet footnote ‡. The CY74FCT652CTQCT hardware supports simultaneous capture, but system-level timing validation is required for deterministic dual-bus storage.
Is CY74FCT652CTQCT RoHS compliant and lead-free?
Yes, the CY74FCT652CTQCT is RoHS compliant and lead-free. Per TI's Packaging Information Addendum, the orderable part CY74FCT652CTQCT carries the "Green (RoHS & no Sb/Br)" eco plan with "NIPDAU" (nickel-palladium-gold) lead finish and meets JEDEC MSL Level-2-260°C-1 year moisture sensitivity. It contains no lead, antimony, or brominated flame retardants above JEDEC/IEC thresholds, and is qualified for lead-free reflow soldering processes up to 260°C peak temperature.
CY74FCT652CTQCT 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
CY74FCT652CTQCT FAQ
1.How can I place an order for CY74FCT652CTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT652CTQCT 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 CY74FCT652CTQCT reliable?
The price and inventory of CY74FCT652CTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT652CTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT652CTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT652CTQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT652CTQCT?
CY74FCT652CTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT652CTQCT 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 CY74FCT652CTQCT?
For technical support, including CY74FCT652CTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT652CTQCT requirements.
6.How does Aetrix verify that CY74FCT652CTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT652CTQCT 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 CY74FCT652CTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT652CTQCT?
All CY74FCT652CTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT652CTQCT, 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 CY74FCT652CTQCT part is unused and in its original packaging.
Return procedure for CY74FCT652CTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY74FCT652CTQCT Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
