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Texas Instruments CY74FCT245TSOCG4
- Part No.:
- CY74FCT245TSOCG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT245TSOCG4.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,324
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Product details
Overview
CY74FCT245TSOCG4 from Texas Instruments is an 8-bit noninverting bidirectional transceiver with 3-state outputs, designed for bus-oriented data routing between two 8-bit ports (A and B). It features 64-mA sink / 32-mA source drive strength, 7-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels. It is used in industrial control backplanes and legacy system bus isolation.
For engineers reviewing the CY74FCT245TSOCG4 datasheet, CY74FCT245TSOCG4 pinout, CY74FCT245TSOCG4 application, or CY74FCT245TSOCG4 equivalent, key selection criteria include bidirectional bus direction control via T/R, high-impedance state enable via OE, Ioff protection during power sequencing, and SOIC-20 package compatibility with 5-V TTL systems.
Technical Context
The CY74FCT245TSOCG4 implements edge-rate controlled CMOS output drivers to reduce switching noise while maintaining full TTL voltage-level compatibility. Its dual-control architecture uses separate T/R (transmit/receive) and OE (output enable) inputs to independently manage data flow direction and port disable states.
It supports partial-power-down operation via Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V and ports are biased to 4.5 V - critical for hot-swap and mixed-voltage board designs. Matched rise/fall times and hysteresis (Vhys = 0.2 V) further enhance noise immunity in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.75 V to 5.25 V - ensures stable operation across industrial-grade 5-V rails with ±5% tolerance. |
| Output Drive Strength | 64 mA sink / 32 mA source - enables direct driving of multiple TTL loads without external buffers. |
| Propagation Delay | 1.5 ns min / 7 ns max (A↔B) - supports reliable 100-MHz bus toggling with timing margin. |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging backflow during power-down sequencing in multi-rail systems. |
| Input Hysteresis | 0.2 V - improves noise rejection on shared control lines like T/R and OE in noisy backplane environments. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field service. |
Pinout & Package
Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1 (unlimited reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | Port A bidirectional data terminals - connect to local bus or microcontroller data lines. |
| 11, 13, 14, 15, 16, 17, 18, 19 | B0–B7 | Port B bidirectional data terminals - interface with peripheral or memory bus segments. |
| 9 | GND | Ground reference for all I/O and internal logic - must be low-impedance connection. |
| 10 | VCC | 5-V supply input - requires local 0.1-µF ceramic decoupling adjacent to pin. |
| 12 | T/R | Transmit/Receive control - high enables A→B flow; low enables B→A flow. |
| 20 | OE | Output Enable - low enables transceiver; high forces both A and B ports into high-Z state. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dv/dt - critical for signal integrity on dense PCBs. |
| Ioff partial-power-down | Enables safe insertion/removal in live backplanes without latch-up or bus contention. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clocked data buses, preserving setup/hold margins. |
| 3.3-V VOH typical | Ensures robust high-level margin (>2.4 V min) when driving legacy TTL inputs under worst-case VCC and temperature. |
| Function & pinout compatibility | Drop-in replacement for CY74FCT244T, CY74FCT245T, and 74F245 families - simplifies legacy design refresh. |
Applications
| Industrial Backplane Isolation | Legacy System Bus Extension |
|---|---|
Use Scenario: Isolating CPU and peripheral buses in programmable logic controllers (PLCs) with independent power domains. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing data flow between isolated 5-V subsystems using T/R and OE controls. Use Value: Ioff protection prevents backfeed damage during module hot-swap; 64-mA drive sustains signal integrity across 15-cm backplane traces. | Use Scenario: Extending ISA or VMEbus segments in test equipment where bus loading exceeds driver capability. IC Role / Device Role / Timing Role: Buffering and isolating address/data lines between master and slave cards with precise 7-ns timing control. Use Value: Matched rise/fall times prevent skew-induced setup violations; 3-state outputs allow dynamic bus sharing among multiple peripherals. |
| Microcontroller Peripheral Interface | Memory Subsystem Interfacing |
Use Scenario: Connecting an 8-bit microcontroller's data bus to external parallel EEPROM or LCD controller. IC Role / Device Role / Timing Role: Direction-controlled data bridge enabling read/write cycles via T/R, with OE disabling during interrupt servicing. Use Value: TTL-compatible inputs eliminate level-shifters; 32-mA source drive directly powers LCD segment drivers without external pull-ups. | Use Scenario: Interfacing SRAM or EPROM to a microprocessor bus with strict timing requirements. IC Role / Device Role / Timing Role: Bidirectional data path between CPU D0–D7 and memory DQ0–DQ7, synchronized to WR/RD strobes. Use Value: 1.5-ns min propagation delay preserves timing budget; hysteresis rejects noise on shared control lines in memory expansion slots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F245N | Slower speed (10-ns max tPLH), no Ioff, lower drive (20-mA sink), PDIP-20 only | Limited to static 5-V systems without hot-swap; unsuitable for partial-power-down designs | Select when cost is primary and Ioff/edge-rate control are unnecessary |
| 74ACT245SCX | Higher VCC range (4.5–5.5 V), 24-mA source/24-mA sink, no Ioff, SOIC-20 | Compatible with wider supply tolerances but lacks power-down safety for modular systems | Choose for improved noise immunity over F-series, but verify Ioff requirement exclusion |
Compared with SN74F245N and 74ACT245SCX, the CY74FCT245TSOCG4 delivers superior bus drive, guaranteed Ioff protection, and tighter timing - making it the preferred choice for industrial backplanes requiring reliability under dynamic power conditions.
Availability
CY74FCT245TSOCG4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system bus extension, microcontroller peripheral interfacing, and memory subsystem interfacing requiring stable component supply and long-term obsolescence management.
Supply support for CY74FCT245TSOCG4 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 industrial-grade product heritage.
The CY74FCT245TSOCG4 belongs to TI's FCT logic family, engineered for high-noise-immunity, TTL-compatible bus interfacing in mission-critical industrial and aerospace systems where reliability under voltage transients and thermal stress is essential.
FAQ
What is the maximum operating temperature range for the CY74FCT245TSOCG4?
The CY74FCT245TSOCG4 is rated for operation from –40°C to +85°C ambient temperature. This industrial temperature range is validated per TI's recommended operating conditions and supported by thermal characterization (θJA = 58°C/W for SOIC package), ensuring reliable performance in factory automation and outdoor control enclosures.
Does the CY74FCT245TSOCG4 support hot-swap capability?
Yes, the CY74FCT245TSOCG4 supports hot-swap via its Ioff circuitry, which limits reverse current to ±1 µA when VCC = 0 V and I/O pins are biased up to 4.5 V. This feature prevents damage during live insertion into powered backplanes - a key requirement confirmed in the absolute maximum ratings and electrical characteristics tables of the official datasheet.
What is the function of the T/R and OE pins on the CY74FCT245TSOCG4?
The T/R (transmit/receive) pin controls data direction: high enables A→B flow, low enables B→A flow. The OE (output enable) pin globally disables both ports into high-impedance state when high. These two independent controls allow precise bus arbitration - for example, OE can isolate the device during reset while T/R configures active data path direction.
Is the CY74FCT245TSOCG4 pin-compatible with older 74F245 devices?
Yes, the CY74FCT245TSOCG4 is functionally and pinout-compatible with standard 74F245 and 74LS245 devices in SOIC-20 package. Pin assignments (A0–A7, B0–B7, T/R, OE, VCC, GND) match exactly, and TTL-compatible input thresholds ensure drop-in replacement without layout changes - explicitly stated in the "Function, Pinout, and Drive Compatible With FCT and F Logic" section of the datasheet.
What packaging and compliance information applies to the CY74FCT245TSOCG4?
The CY74FCT245TSOCG4 is supplied in SOIC-20 (DW) package with NIPDAU lead finish, RoHS-compliant, MSL Level-1 (unlimited floor life), and tube packaging (25 units per tube). It meets JEDEC JESD22 ESD standards (2000-V HBM) and is qualified for industrial temperature operation - all verified in TI's Package Option Addendum and Packaging Information documents.
CY74FCT245TSOCG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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-SOIC
CY74FCT245TSOCG4 FAQ
1.How can I place an order for CY74FCT245TSOCG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245TSOCG4 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 CY74FCT245TSOCG4 reliable?
The price and inventory of CY74FCT245TSOCG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245TSOCG4 is usually 5 days.
3.What payment methods are accepted for CY74FCT245TSOCG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245TSOCG4 transactions.
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4.How is shipping managed for CY74FCT245TSOCG4?
CY74FCT245TSOCG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245TSOCG4 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 CY74FCT245TSOCG4?
For technical support, including CY74FCT245TSOCG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245TSOCG4 requirements.
6.How does Aetrix verify that CY74FCT245TSOCG4 is sourced from the original manufacturer or authorized distributors?
All CY74FCT245TSOCG4 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 CY74FCT245TSOCG4 meets industry standards.
7.What is the process for return or replacement of CY74FCT245TSOCG4?
All CY74FCT245TSOCG4 units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245TSOCG4, 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 CY74FCT245TSOCG4 part is unused and in its original packaging.
Return procedure for CY74FCT245TSOCG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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