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Texas Instruments CY74FCT2240CTSOCT
- Part No.:
- CY74FCT2240CTSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT2240CTSOCT.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,424
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Product details
Overview
CY74FCT2240CTSOCT from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution in TTL- and CMOS-compatible systems. It features on-chip 25-Ω series output resistors, 4.1 ns maximum propagation delay at 5 V, ±15 mA output drive, and Ioff support for partial-power-down operation.
For engineers reviewing the CY74FCT2240CTSOCT datasheet, CY74FCT2240CTSOCT pinout, CY74FCT2240CTSOCT application, or CY74FCT2240CTSOCT equivalent, key selection criteria include 3-state bus interface capability, 25-Ω integrated termination, industrial temperature range (–40°C to +85°C), and SOIC-20 package compatibility with legacy FCT logic families.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus isolation. Each output incorporates edge-rate control circuitry and 25-Ω series resistors to suppress transmission-line reflections without external components.
It operates across 4.75 V to 5.25 V supply, delivers TTL-compatible VOH ≥2.4 V and VOL ≤0.55 V under load, and supports Ioff protection-ensuring no backflow current when VCC = 0 V and outputs are biased to 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay | Max 4.1 ns (tPLH/tPHL) at VCC = 5 V - enables high-speed address/clock buffering in 25 MHz+ bus systems |
| Output Drive | ±15 mA (IOH/IOL) - sufficient to drive 50 Ω transmission lines or fan-out to 20+ TTL loads |
| Supply Voltage | 4.75–5.25 V - tightly regulated 5 V operation compatible with legacy TTL and mixed-signal systems |
| Input Thresholds | VIH ≥2.0 V, VIL ≤0.8 V - ensures robust noise immunity and direct interface with TTL, NMOS, and CMOS inputs |
| Termination Resistance | 25 Ω (typical) - integrated series resistor per output eliminates need for discrete termination, reducing PCB area and BOM count |
| Ioff Protection | ±1 µA max at VCC = 0 V - prevents damaging current flow during hot-insertion or partial power-down sequences |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for industrial handling reliability |
Pinout & Package
Package: SOIC-20 (DW), body size 7.5 mm × 12.8 mm, standard 0.300-inch width, RoHS-compliant CU-NiPdAu finish, MSL Level-1 (260°C, unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | DA0–DA3, DB0–DB3 | Data inputs for two independent 4-bit buffer sections |
| 9 | GND | Ground reference for all logic and output stages |
| 10, 11, 12, 13, 14, 15, 16, 17 | OA0–OA3, OB0–OB3 | Noninverting 3-state outputs - each includes 25-Ω series resistor |
| 18 | OEB | Active-low enable for OB0–OB3 outputs |
| 19 | VCC | Positive supply (4.75–5.25 V) |
| 20 | OEA | Active-low enable for OA0–OA3 outputs |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 25-Ω output resistors | Reduces board-level reflection noise without external components, enabling clean signal integrity on 50 Ω traces |
| Edge-rate control circuitry | Slows output transitions just enough to suppress ringing while maintaining 4.1 ns speed - optimized for EMI reduction |
| Ioff partial-power-down support | Disables outputs and blocks reverse current when VCC = 0 V - essential for hot-swap and multi-rail system designs |
| TTL-compatible input/output levels | Direct interface with legacy TTL, NMOS, and CMOS without level shifters or pull-ups - simplifies mixed-technology integration |
| Function and pinout compatibility | Drop-in replacement for industry-standard FCT and F logic families - preserves existing layouts and firmware |
Applications
| Memory Address Buffering | System Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating address signals and enabling time-multiplexed access to multiple memory banks. Use Value: Integrated 25-Ω termination minimizes overshoot/ringing on long address traces, ensuring setup/hold timing margins remain intact at 25 MHz operation. | Use Scenario: Distributing a master clock signal to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) on a PCB. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with independent enable controls for selective peripheral clock gating. Use Value: 4.1 ns propagation delay and edge-rate control maintain sub-nanosecond skew across eight outputs, preserving clock-to-data alignment. |
| Bus Transceiver Interface | Legacy Logic Translation Layer |
Use Scenario: Bidirectional data transfer between a microprocessor data bus and peripheral controllers using separate read/write strobes. IC Role / Device Role / Timing Role: Dual 4-bit 3-state buffer acting as direction-controlled bus driver/receiver with independent OEA/OEB enables. Use Value: Independent enables allow precise timing of bus turnarounds, while Ioff protection prevents latch-up during power sequencing mismatches. | Use Scenario: Interfacing modern 5 V CMOS microcontrollers with older TTL-based subsystems (e.g., industrial PLC I/O modules). IC Role / Device Role / Timing Role: Level-translating buffer providing TTL-output swing and input thresholds while consuming <0.2 mA static current. Use Value: Eliminates need for discrete resistive pull-ups or active translators - reduces component count and improves reliability in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT240NSR | Same SOIC-20 package, identical pinout, but rated for 0°C to +70°C only; lacks Ioff specification | Suitable for commercial-temperature-only systems; not qualified for industrial thermal cycling or partial-power-down use | Select only if operating ambient stays within 0°C–70°C and full-system power sequencing is guaranteed |
| 74ACT240SCX | Higher drive (±24 mA), faster (3.5 ns), but no integrated 25-Ω resistors or Ioff; requires external termination | Better for high-speed point-to-point links where board space allows discrete resistors; unsuitable for hot-swap or mixed-rail systems | Choose when maximum speed and drive outweigh termination integration and power-down safety requirements |
Compared with SN74FCT240NSR and 74ACT240SCX, CY74FCT2240CTSOCT uniquely combines industrial temperature rating, integrated 25-Ω termination, and Ioff protection - making it the only option among the three qualified for ruggedized, hot-pluggable, or multi-voltage domain applications.
Availability
CY74FCT2240CTSOCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus transceiver applications requiring stable component supply across industrial temperature ranges and long product lifecycles.
Supply support for CY74FCT2240CTSOCT 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 high-reliability interface and timing products.
CY74FCT2240CTSOCT belongs to the TI FCT logic family, engineered for low-noise, high-speed digital interfacing in industrial, computing, and communications equipment where signal integrity and power-down safety are critical.
FAQ
What is the maximum operating temperature range for CY74FCT2240CTSOCT?
CY74FCT2240CTSOCT is specified for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is confirmed in the Ordering Information table and Recommended Operating Conditions section of the official TI datasheet SCCS036A. The SOIC-20 package (DW) maintains electrical performance across this full span without derating.
Does CY74FCT2240CTSOCT support hot-swap or partial-power-down operation?
Yes, CY74FCT2240CTSOCT includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V and outputs are biased up to 4.5 V. This feature is explicitly documented in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling safe use in systems with staggered power sequencing or live insertion scenarios.
What is the purpose of the 25-Ω output resistors in CY74FCT2240CTSOCT?
The 25-Ω on-chip series resistors in CY74FCT2240CTSOCT are designed to match typical PCB trace impedance and suppress transmission-line reflections. As stated in the Functional Description and Electrical Characteristics (ROUT = 20–40 Ω), they reduce ringing and overshoot without requiring external components - directly improving signal integrity on medium-length buses or clock lines.
Is CY74FCT2240CTSOCT pin-compatible with other FCT-family octal buffers?
Yes, CY74FCT2240CTSOCT is functionally and pinout-compatible with standard FCT and F logic octal buffers, including CY74FCT240 and SN74FCT240. The datasheet confirms "Function and Pinout Compatible With FCT and F Logic" and provides identical pin assignments for DAx/OAx and DBx/OBx pairs, enabling drop-in replacement in existing SOIC-20 layouts.
What are the absolute maximum ratings for supply voltage and input voltage on CY74FCT2240CTSOCT?
CY74FCT2240CTSOCT has an absolute maximum supply voltage (VCC) of –0.5 V to +7 V and DC input voltage range of –0.5 V to +7 V, as specified in the Absolute Maximum Ratings table. Exceeding these limits may cause permanent damage. These ratings apply regardless of operating temperature and are distinct from recommended operating conditions (4.75–5.25 V).
CY74FCT2240CTSOCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CY74FCT2240CTSOCT FAQ
1.How can I place an order for CY74FCT2240CTSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT2240CTSOCT 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 CY74FCT2240CTSOCT reliable?
The price and inventory of CY74FCT2240CTSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2240CTSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT2240CTSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2240CTSOCT transactions.
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4.How is shipping managed for CY74FCT2240CTSOCT?
CY74FCT2240CTSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT2240CTSOCT 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 CY74FCT2240CTSOCT?
For technical support, including CY74FCT2240CTSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2240CTSOCT requirements.
6.How does Aetrix verify that CY74FCT2240CTSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT2240CTSOCT 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 CY74FCT2240CTSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT2240CTSOCT?
All CY74FCT2240CTSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2240CTSOCT, 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 CY74FCT2240CTSOCT part is unused and in its original packaging.
Return procedure for CY74FCT2240CTSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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