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Texas Instruments CY74FCT245ATQCT
- Part No.:
- CY74FCT245ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT245ATQCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,675
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Product details
Overview
CY74FCT245ATQCT from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data transfer between asynchronous systems. It features 64-mA sink / 32-mA source drive strength, 4.6-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels. It operates across –40°C to +85°C in SSOP-20 package for industrial bus interface applications.
For engineers reviewing the CY74FCT245ATQCT datasheet, CY74FCT245ATQCT pinout, CY74FCT245ATQCT application, or CY74FCT245ATQCT equivalent, key selection criteria include direction control (T/R), output enable (OE), 3-state bus isolation, drive capability matching legacy FCT logic, and SSOP-20 thermal performance (θJA = 68°C/W).
Technical Context
The CY74FCT245ATQCT implements dual-bus bidirectional data flow controlled by active-high T/R and OE inputs: T/R = high enables A→B transfer; T/R = low enables B→A transfer; OE = high forces all outputs into high-impedance state. Its edge-rate control circuitry reduces switching noise while maintaining matched rise/fall times.
It supports partial-power-down via Ioff, which disables outputs and blocks current backflow when VCC = 0 V (Ioff ≤ ±1 µA). Fully compatible with TTL input thresholds (VIL = 0.8 V, VIH = 2.0 V) and delivers VOH ≥ 2.4 V (min) at IOH = –32 mA and VOL ≤ 0.55 V (max) at IOL = 64 mA under VCC = 4.75–5.25 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within regulated 5-V supply rails with ±2.5% tolerance |
| Propagation Delay | ≤4.6 ns (max) - Enables reliable 100+ MHz bus timing in synchronous systems |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads and multiple TTL inputs without external buffers |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents damaging back-current during hot-swap or power sequencing |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial environments |
| Package | SSOP-20 (DBQ) - Surface-mount footprint with 0.65-mm pitch, 68°C/W θJA |
Pinout & Package
SSOP-20 (DBQ) package: 20-pin shrink small-outline package, 7.2 mm × 5.3 mm body, 0.65 mm lead pitch, 1.95 mm max height, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Input/Output port A | 8-bit bidirectional data lane connected to local bus or microcontroller side |
| B0–B7 | Input/Output port B | 8-bit bidirectional data lane connected to peripheral or memory bus side |
| T/R | Direction control | Active-high signal selecting A→B (high) or B→A (low) data flow |
| OE | Output enable | Active-low control (logic high disables both ports to high-Z) |
| VCC | Power supply | 5-V nominal supply pin; decoupling required within 10 mm of pin |
| GND | Ground reference | Signal and power ground return; must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Independent OE and T/R inputs allow precise bus arbitration and multi-master conflict avoidance |
| Edge-Rate Controlled Outputs | Reduced di/dt minimizes simultaneous switching noise (SSN) on shared PCB traces and power planes |
| Ioff Partial-Power-Down | Enables safe insertion/removal in live backplanes and supports system-level power gating |
| TTL-Compatible Interface | Accepts standard TTL input voltages and drives TTL loads directly-no level-shifting required |
| Matched Rise/Fall Times | Ensures minimal skew across all 8 bits, critical for parallel bus setup/hold timing integrity |
Applications
| Industrial PLC Backplane Interface | Legacy Microcontroller Bus Extension |
|---|---|
Use Scenario: Interfacing a modern ARM-based controller to legacy 5-V parallel I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-consistent bus transceiver enabling data exchange between mismatched voltage domains without translation. Use Value: Eliminates need for discrete level shifters; 64-mA drive sustains signal integrity over 15-cm backplane traces at 25-MHz burst rates. | Use Scenario: Expanding GPIO count of an 8051-family MCU using external parallel peripherals (ADCs, DACs, latch-based displays). IC Role / Device Role / Timing Role: Direction-controlled data bridge between MCU data bus and peripheral data bus with cycle-accurate enable timing. Use Value: 4.6-ns propagation delay meets 8051's 12-MHz bus timing; OE/T/R logic matches standard 8051 bus control waveforms. |
| Test Equipment Digital I/O Module | Automated Test Fixture Data Mux |
Use Scenario: Building modular digital I/O cards for ATE systems requiring hot-swappable, isolated channel banks. IC Role / Device Role / Timing Role: Isolation and direction management element in per-channel buffer stage with independent OE per group. Use Value: Ioff protection prevents backfeed during card insertion; 2000-V HBM withstands ESD events common in lab environments. | Use Scenario: Routing DUT signals between multiple test instruments (oscilloscope, logic analyzer, pattern generator) via software-controlled path selection. IC Role / Device Role / Timing Role: Reconfigurable bidirectional signal path selector with deterministic 3-state disable timing. Use Value: tPZL/tPHZ ≤ 6.2 ns ensures clean break-before-make switching; matched edge rates reduce crosstalk in dense signal routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY74FCT245CTQCT | 4.1-ns max propagation delay; identical pinout, drive strength, and package | Suitable where tighter timing margins are required (e.g., 33-MHz ISA-like buses) | Select when system timing budget demands <4.6 ns delay; otherwise CY74FCT245ATQCT offers better noise margin |
| SN74FCT245ATPWR | TSSOP-20 package (same pinout); 4.6-ns delay; same drive specs; RoHS-compliant NIPDAU finish | Preferred for new designs requiring finer-pitch surface-mount assembly and IPC-7351-compliant footprints | Choose for compatibility with automated optical inspection (AOI) and higher-density PCB layouts |
Compared with CY74FCT245CTQCT and SN74FCT245ATPWR, the CY74FCT245ATQCT provides optimal balance of noise immunity (edge-rate control), industrial temperature range, and SSOP-20 manufacturability-making it ideal for cost-sensitive, noise-prone industrial bus interfaces where 4.6-ns timing is sufficient.
Availability
CY74FCT245ATQCT is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus extensions, and automated test equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for CY74FCT245ATQCT 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 with emphasis on reliability, longevity, and industrial-grade qualification.
The CY74FCT245ATQCT belongs to TI's FCT logic family, engineered for robust 5-V bus interfacing in industrial, telecom, and instrumentation systems where noise immunity, power-down safety, and TTL compatibility are essential.
FAQ
What is the maximum clock/data rate supported by the CY74FCT245ATQCT?
The CY74FCT245ATQCT does not operate on a clock; it is an asynchronous transceiver. Its 4.6-ns max propagation delay supports reliable data transfer up to approximately 100 MHz in well-terminated, low-capacitance bus configurations. Real-world achievable rate depends on trace length, load capacitance, and noise margin-designers should verify timing using tPLH/tPHL, tPZL/tPHZ, and system-level setup/hold analysis. The CY74FCT245ATQCT datasheet specifies no minimum pulse width, confirming suitability for burst-mode and irregular data transfers.
Does the CY74FCT245ATQCT support hot-swap or live-insertion?
Yes, the CY74FCT245ATQCT supports hot-swap via its Ioff feature: when VCC = 0 V, Ioff limits current flow to ±1 µA even if A/B pins are biased to 4.5 V, preventing damage during live insertion. This behavior is tested and specified per JESD78. However, proper board-level design-including series resistors, TVS diodes, and staggered pin lengths-is still required to meet full hot-swap compliance standards. The CY74FCT245ATQCT itself provides the foundational isolation needed for such implementations.
Can the CY74FCT245ATQCT be used with 3.3-V microcontrollers?
The CY74FCT245ATQCT is a 5-V-only device (VCC = 4.75–5.25 V) and is not 3.3-V tolerant on inputs. Direct connection to 3.3-V MCU I/O risks violating absolute maximum ratings (VI ≤ 7 V, but sustained >5.5 V may degrade reliability). For 3.3-V ↔ 5-V translation, use a dedicated level shifter (e.g., TXB0108) upstream of the CY74FCT245ATQCT, or select a 3.3-V–compatible transceiver like SN74LVC245A. The CY74FCT245ATQCT remains optimal only in pure 5-V systems.
What is the function of the T/R and OE pins on the CY74FCT245ATQCT?
On the CY74FCT245ATQCT, T/R (transmit/receive) controls data direction: T/R = high enables A→B transfer; T/R = low enables B→A transfer. OE (output enable) is active-low: OE = low enables outputs; OE = high places both A and B ports in high-impedance state, effectively disconnecting the device from both buses. These two controls operate independently-OE overrides T/R, ensuring bus isolation regardless of direction setting. This dual-control architecture enables flexible bus arbitration in multi-master systems.
Is the CY74FCT245ATQCT pin-compatible with older 74F245 or 74LS245 devices?
The CY74FCT245ATQCT is functionally and pinout-compatible with industry-standard 20-pin 74-series octal transceivers (e.g., 74F245, 74LS245) in SOIC and SSOP packages, sharing identical A0–A7, B0–B7, T/R, OE, VCC, and GND pin assignments. However, it is not a drop-in replacement for DIP-packaged variants due to differing package dimensions and thermal characteristics. Always verify PCB land patterns match DBQ (SSOP-20) footprint-not DW (SOIC-20)-and confirm VCC tolerance (4.75–5.25 V) aligns with system regulation before substitution. The CY74FCT245ATQCT improves upon legacy parts with Ioff and edge-rate control.
CY74FCT245ATQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-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:
- 20-SSOP
CY74FCT245ATQCT FAQ
1.How can I place an order for CY74FCT245ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245ATQCT 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 CY74FCT245ATQCT reliable?
The price and inventory of CY74FCT245ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT245ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT245ATQCT?
CY74FCT245ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245ATQCT 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 CY74FCT245ATQCT?
For technical support, including CY74FCT245ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245ATQCT requirements.
6.How does Aetrix verify that CY74FCT245ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT245ATQCT 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 CY74FCT245ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT245ATQCT?
All CY74FCT245ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245ATQCT, 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 CY74FCT245ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT245ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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