My Inquiry
My Account
Texas Instruments CY74FCT245CTSOCT
- Part No.:
- CY74FCT245CTSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT245CTSOCT.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,663
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY74FCT245CTSOCT 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, 4.1-ns max propagation delay, Ioff partial-power-down support, and TTL-compatible logic levels. It is used in industrial control backplanes and legacy system bus isolation.
For engineers reviewing the CY74FCT245CTSOCT datasheet, CY74FCT245CTSOCT pinout, CY74FCT245CTSOCT application, or CY74FCT245CTSOCT equivalent, key selection criteria include bidirectional direction control via T/R input, simultaneous high-impedance disable via OE, edge-rate-controlled noise performance, and SOIC-20 package compatibility with 5-V bus systems.
Technical Context
The CY74FCT245CTSOCT implements a dual-bus transceiver architecture with independent transmit/receive (T/R) and output enable (OE) control signals. Its function table defines three operational states: A→B (T/R = H, OE = L), B→A (T/R = L, OE = L), and high-impedance isolation (OE = H).
It integrates edge-rate control circuitry to reduce switching noise and supports Ioff protection, disabling outputs and blocking current flow when VCC = 0 V. Input thresholds meet TTL specifications (VIH = 2 V min, VIL = 0.8 V max), ensuring interoperability with legacy 5-V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 8-bit noninverting bidirectional transceiver with 3-state outputs |
| Propagation Delay | Max 4.1 ns (A↔B path, VCC = 4.75–5.25 V, TA = –40°C to 85°C) |
| Drive Strength | 64 mA sink / 32 mA source per output - sufficient for driving 50-pF loads at full speed |
| Supply Voltage | 4.75 V to 5.25 V - tightly regulated 5-V operation, not tolerant of 3.3-V rails |
| Ioff Support | Enables safe partial-power-down; leakage ≤ ±1 µA when VCC = 0 V and port voltage = 4.5 V |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial handling requirements |
| Package | SOIC-20 (DW), 7.5-mm body width, 1.27-mm pitch - standard surface-mount footprint |
Pinout & Package
SOIC-20 (DW) package: 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A0–A7 | Port A data inputs/outputs - connect to upstream bus or controller side |
| 11, 12, 13, 14, 15, 16, 17, 18 | B0–B7 | Port B data inputs/outputs - connect to downstream bus or peripheral side |
| 9 | GND | Ground reference for all I/O and internal logic |
| 10 | VCC | 5-V power supply - must be decoupled locally with 0.1-µF ceramic capacitor |
| 19 | T/R | Transmit/Receive control - high enables A→B, low enables B→A |
| 20 | OE | Output Enable - low enables transceiver; high forces all A/B pins to high-Z |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) and EMI without external series resistors |
| Ioff partial-power-down | Prevents backflow current when VCC is off - essential for hot-swap and multi-rail systems |
| TTL-compatible input thresholds | VIH = 2 V min, VIL = 0.8 V max - ensures reliable interfacing with legacy 5-V microcontrollers and FPGAs |
| Matched rise/fall times | Minimizes duty-cycle distortion on clock or strobe signals routed through the bus |
| 3-state bus hold immunity | High-impedance state remains stable under floating-bus conditions - avoids undefined logic states |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Isolating CPU address/data bus from expansion slot peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling read/write cycles between master and slave modules while maintaining signal integrity across 20-cm traces. Use Value: 4.1-ns propagation delay and edge-rate control ensure setup/hold timing margins are preserved at 25-MHz bus rates. |
Use Scenario: Interfacing a modern FPGA-based controller with legacy ISA-bus peripherals in test equipment. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled buffer that matches TTL voltage thresholds and drive strength of original ISA components. Use Value: 64-mA sink capability drives heavy capacitive loads typical of vintage ISA slots without signal degradation. |
| Microcontroller Peripheral Expansion | Memory-Mapped I/O Multiplexing |
Use Scenario: Expanding GPIO count of an 8-bit MCU by connecting parallel LCD, keypad, and ADC interfaces over shared data lines. IC Role / Device Role / Timing Role: Directional data multiplexer controlled by MCU GPIO pins (T/R and OE), enabling time-shared access to multiple peripherals. Use Value: Ioff support allows safe power sequencing - peripherals remain powered while MCU resets or enters sleep mode. |
Use Scenario: Sharing a single 8-bit data bus between SRAM, EEPROM, and CPLD configuration memory in embedded instrumentation. IC Role / Device Role / Timing Role: Bus isolator preventing contention during concurrent memory access attempts; OE synchronized to chip-select strobes. Use Value: 3-state outputs guarantee zero DC loading on inactive devices - critical for stable memory read/write margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT245CTSOCT | Same logic function, identical pinout, but lower drive (48-mA sink / 12-mA source); 4.5-ns max tPLH | Suitable only where load capacitance ≤ 30 pF or bus length < 10 cm | Select when lower power consumption is prioritized over drive margin and noise immunity |
| 74ACT245SCX | CMOS-based, higher VOH (≥4.4 V), no Ioff, 5.5-V absolute max rating, 6.5-ns max delay | Lacks partial-power-down protection; requires strict VCC sequencing in multi-supply systems | Choose for mixed-voltage systems where 3.3-V/5-V level translation is needed, but avoid in hot-swap designs |
Compared with SN74FCT245CTSOCT and 74ACT245SCX, the CY74FCT245CTSOCT delivers superior noise immunity via edge-rate control, robust Ioff behavior for unpowered bus segments, and higher drive strength - making it optimal for industrial backplanes and legacy bus extensions where signal integrity and fault tolerance are critical.
Availability
CY74FCT245CTSOCT is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system bus isolation, and microcontroller peripheral expansion requiring stable component supply and long-term obsolescence management.
Supply support for CY74FCT245CTSOCT 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 experience.
The CY74FCT245CTSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and military-aerospace systems.
FAQ
What is the maximum operating temperature range for the CY74FCT245CTSOCT?
The CY74FCT245CTSOCT is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in factory automation, motor drives, and outdoor instrumentation where thermal cycling and extended temperature exposure occur. The SOIC-20 package's θJA of 58°C/W enables reliable thermal performance with minimal heatsinking.
Does the CY74FCT245CTSOCT support 3.3-V logic inputs?
No - the CY74FCT245CTSOCT is a 5-V-only device with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). While 3.3-V logic outputs may register as valid HIGH inputs under nominal conditions, this violates the recommended operating conditions and risks marginal operation due to reduced noise margin. For 3.3-V systems, use a dedicated level translator or a 3.3-V–compatible transceiver such as the SN74LVC245A.
Can the CY74FCT245CTSOCT be used in hot-swap applications?
Yes - the CY74FCT245CTSOCT includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V, even if A or B port voltages reach 4.5 V. This feature protects powered subsystems during live insertion/removal of boards in backplane architectures, satisfying hot-swap safety requirements without external protection circuitry.
What is the purpose of the T/R and OE pins on the CY74FCT245CTSOCT?
The T/R (transmit/receive) pin controls data direction: high enables flow from A ports to B ports; low enables flow from B ports to A ports. The OE (output enable) pin globally disables both ports - when high, all A and B pins enter high-impedance state regardless of T/R state. These two independent controls allow precise bus arbitration and conflict-free multi-master operation in shared-data environments.
Is the CY74FCT245CTSOCT pin-compatible with other FCT245 variants?
Yes - the CY74FCT245CTSOCT shares identical SOIC-20 (DW) pinout and function with all CY74FCT245xTSOCT variants (e.g., CY74FCT245ATSOCT, CY74FCT245TSOCT). Differences lie only in propagation delay (3.8–4.6 ns), drive strength (12/48 mA to 32/64 mA), and operating voltage range - allowing direct substitution where timing and drive margins permit.
CY74FCT245CTSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
CY74FCT245CTSOCT FAQ
1.How can I place an order for CY74FCT245CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT245CTSOCT 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 CY74FCT245CTSOCT reliable?
The price and inventory of CY74FCT245CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT245CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT245CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT245CTSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT245CTSOCT?
CY74FCT245CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT245CTSOCT 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 CY74FCT245CTSOCT?
For technical support, including CY74FCT245CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT245CTSOCT requirements.
6.How does Aetrix verify that CY74FCT245CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT245CTSOCT 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 CY74FCT245CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT245CTSOCT?
All CY74FCT245CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT245CTSOCT, 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 CY74FCT245CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT245CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY74FCT245CTSOCT 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…
