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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments CY74FCT2240ATQC

Name: CY74FCT2240ATQC
Brand: Texas Instruments
SKU: CY74FCT2240ATQC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: CY74FCT2240ATQC

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: CY74FCT2240ATQC.pdf

Description:: BUS DRIVER, FCT SERIES

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Product details

Overview

CY74FCT2240ATQC from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution in high-speed TTL-compatible bus systems. It features 25-Ω on-chip series output resistors, I_off partial-power-down support, ±1 µA input leakage at V_CC = 5.25 V, and 4.8 ns max propagation delay (t_PLH/t_PHL) across –40°C to +85°C.

For engineers reviewing the CY74FCT2240ATQC datasheet, CY74FCT2240ATQC pinout, CY74FCT2240ATQC application, or CY74FCT2240ATQC equivalent, key selection criteria include its 25-Ω integrated termination, 12 mA sink / 15 mA source drive strength, dual 3-state enable control (OEA/OEB), I_off protection, and QSOP-20 package compatibility with legacy FCT logic families.

Technical Context

This device implements dual independent 4-bit noninverting buffers, each with separate 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry and on-die 25-Ω series resistors suppress transmission-line reflections without external components.

The I_off feature actively disables outputs when V_CC = 0 V, limiting backflow current to ±1 µA - enabling safe operation in partial-power-down systems. Input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and output levels (V_OL ≤ 0.55 V at 12 mA, V_OH ≥ 2.4 V at –15 mA) ensure full TTL-level interoperability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.75 V to 5.25 V - ensures stable operation under standard 5-V TTL supply tolerances
Max Propagation Delay	4.8 ns - enables reliable timing in 100+ MHz bus applications with margin
Output Drive	12 mA sink / 15 mA source - sufficient to drive 50-pF loads with fast edge rates
On-Chip Termination	25 Ω series resistor per output - eliminates need for discrete termination resistors on PCB
I_off Current	±1 µA at V_CC = 0 V - prevents damaging back-current during hot-insertion or partial power-down
ESD Protection	2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for board-level robustness
Operating Temperature	–40°C to +85°C - qualified for industrial-grade embedded and computing environments

Pinout & Package

Package: QSOP-20 (DBQ), 0.154-inch body width, 0.65-mm lead pitch, RoHS-compliant green finish, MSL Level-2-260°C-1 year.

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 channels
9	GND	Ground reference for all logic and power domains
10, 11, 12, 13, 14, 15, 16, 17	OA0–OA3, OB0–OB3	Noninverting 3-state outputs - each with 25-Ω series termination
18	OEB	Active-low 3-state enable for OB0–OB3 outputs
19	V_CC	5-V power supply connection
20	OEA	Active-low 3-state enable for OA0–OA3 outputs

Key Features

Feature	Design Value
Integrated 25-Ω output series resistors	Reduces PCB component count and layout area while suppressing signal reflections on transmission lines
Dual independent 3-state enables (OEA/OEB)	Allows selective gating of two 4-bit data groups - essential for bidirectional bus arbitration and memory interleaving
I_off partial-power-down protection	Prevents destructive current flow when V_CC is unpowered but I/O pins remain active - critical for hot-swap and modular systems
TTL-compatible input/output voltage levels	Direct interface with legacy TTL, NMOS, and CMOS without level-shifting circuitry or pull-up resistors
Edge-rate control circuitry	Optimizes rise/fall times to balance noise immunity and switching speed - avoids overshoot/ringing in high-frequency traces

Applications

Memory Address Buffering	Clock Distribution Network
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address drivers during memory access arbitration. Use Value: Integrated 25-Ω termination eliminates stub reflections on parallel address traces, maintaining setup/hold timing margins at >20 MHz.	Use Scenario: Distributing a system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with controlled edge rates to minimize jitter accumulation. Use Value: 4.8 ns max t_PLH/t_PHL and 25-Ω series resistance reduce clock signal integrity degradation over 10-cm FR-4 traces.
Bus Transceiver Interface	Industrial Control Backplane Driver
Use Scenario: Bidirectional data transfer between a CPU and peripheral modules via a shared 8-bit data bus. IC Role / Device Role / Timing Role: Dual-channel 3-state buffer enables direction-controlled data flow using OEA/OEB as channel-select enables. Use Value: Independent OEA/OEB allows simultaneous enable of one channel while disabling the other - preventing bus contention during handshaking.	Use Scenario: Driving long, unterminated backplane traces (up to 30 cm) in programmable logic controllers or motion controllers. IC Role / Device Role / Timing Role: High-current line driver with built-in termination compensates for impedance mismatch and skin-effect losses. Use Value: 12 mA sink capability sustains logic-low voltage under 50-pF load + 50-Ω trace impedance, ensuring noise-immune signaling in electrically noisy factory environments.

Memory Address Buffering

Clock Distribution Network

Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus.

IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates address drivers during memory access arbitration.

Use Value: Integrated 25-Ω termination eliminates stub reflections on parallel address traces, maintaining setup/hold timing margins at >20 MHz.

Use Scenario: Distributing a system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with matched trace lengths.

IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with controlled edge rates to minimize jitter accumulation.

Use Value: 4.8 ns max t_PLH/t_PHL and 25-Ω series resistance reduce clock signal integrity degradation over 10-cm FR-4 traces.

Bus Transceiver Interface

Industrial Control Backplane Driver

Use Scenario: Bidirectional data transfer between a CPU and peripheral modules via a shared 8-bit data bus.

IC Role / Device Role / Timing Role: Dual-channel 3-state buffer enables direction-controlled data flow using OEA/OEB as channel-select enables.

Use Value: Independent OEA/OEB allows simultaneous enable of one channel while disabling the other - preventing bus contention during handshaking.

Use Scenario: Driving long, unterminated backplane traces (up to 30 cm) in programmable logic controllers or motion controllers.

IC Role / Device Role / Timing Role: High-current line driver with built-in termination compensates for impedance mismatch and skin-effect losses.

Use Value: 12 mA sink capability sustains logic-low voltage under 50-pF load + 50-Ω trace impedance, ensuring noise-immune signaling in electrically noisy factory 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
CY74FCT2240CTQCT	4.1 ns max propagation delay; same pinout, package, and electrical specs except faster timing grade	Suitable where tighter timing budgets require sub-4.5 ns delay - no layout change needed	Select when system clock frequency exceeds 125 MHz and setup/hold margins are constrained
SN74FCT244NSR	SOIC-20 package only; no integrated 25-Ω resistors; 10 mA sink / 12 mA source; 5.5 ns max delay	Requires external series termination resistors; lower drive strength limits trace length and fanout	Choose if QSOP footprint is unavailable and board space permits discrete 25-Ω resistors per output

Compared with CY74FCT2240CTQCT, the CY74FCT2240ATQC trades 0.7 ns of speed for broader temperature qualification (–40°C to +85°C vs. 0°C to +70°C in some variants); versus SN74FCT244NSR, it delivers superior signal integrity via monolithic termination and higher drive, eliminating layout-dependent resistor placement.

Availability

CY74FCT2240ATQC is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplanes, and bus-oriented transmitter/receiver designs requiring stable component supply across extended temperature ranges.

Supply support for CY74FCT2240ATQC 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 CY74FCT2240ATQC belongs to TI's FCT logic family - engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical embedded systems where reliability and signal integrity are paramount.

FAQ

What is the maximum operating temperature range for CY74FCT2240ATQC?

The CY74FCT2240ATQC is rated for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade specification is confirmed in the ordering information table and absolute maximum ratings section of the official Texas Instruments datasheet SCCS036A. The device maintains full electrical performance across this range, including guaranteed 4.8 ns max propagation delay and 12 mA output sink capability at the extremes.

Does CY74FCT2240ATQC support partial-power-down operation?

Yes, CY74FCT2240ATQC supports partial-power-down operation via its I_off circuitry. When V_CC = 0 V, the outputs are actively disabled and draw only ±1 µA of current even if input or output pins are driven to 4.5 V. This feature is explicitly documented in the functional description and electrical characteristics tables of the TI datasheet, enabling safe use in hot-plug and modular power architectures without external isolation components.

What package type and lead finish does CY74FCT2240ATQC use?

CY74FCT2240ATQC uses a QSOP-20 (DBQ) package with 0.65-mm lead pitch and a green RoHS-compliant finish containing no bromine or antimony-based flame retardants. The package drawing code DBQ, moisture sensitivity level (MSL) rating of Level-2-260°C-1 year, and CU NIPDAU lead finish are verified in TI's official Package Option Addendum dated 28-Aug-2010.

How does the 25-Ω on-chip termination in CY74FCT2240ATQC improve signal integrity?

The 25-Ω series resistors integrated into each output of CY74FCT2240ATQC match typical PCB trace impedances (50–75 Ω) in source-series termination configurations. This reduces signal reflections and standing waves on high-speed lines - directly lowering overshoot, undershoot, and ringing. The feature is highlighted in the device description and electrical characteristics (ROUT = 20–40 Ω typ.) of the TI datasheet, eliminating the need for 8 discrete SMT resistors and associated layout area.

Is CY74FCT2240ATQC pin-compatible with other FCT-family buffers?

Yes, CY74FCT2240ATQC is functionally and pinout-compatible with the broader CY74FCT2240T family, including CY74FCT2240CTQCT and CY74FCT2240TSOCT. The datasheet explicitly states "Function and Pinout Compatible With FCT and F Logic" and confirms identical pin assignments across all speed grades and packages. This allows drop-in replacement within the same package footprint without PCB redesign.

CY74FCT2240ATQC Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

CY74FCT2240ATQC FAQ

1.How can I place an order for CY74FCT2240ATQC through Aetrix?

Please submit a Request for Quotation (RFQ) for CY74FCT2240ATQC 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 CY74FCT2240ATQC reliable?

The price and inventory of CY74FCT2240ATQC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT2240ATQC is usually 5 days.

3.What payment methods are accepted for CY74FCT2240ATQC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT2240ATQC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for CY74FCT2240ATQC?

CY74FCT2240ATQC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your CY74FCT2240ATQC 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 CY74FCT2240ATQC?

For technical support, including CY74FCT2240ATQC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT2240ATQC requirements.

6.How does Aetrix verify that CY74FCT2240ATQC is sourced from the original manufacturer or authorized distributors?

All CY74FCT2240ATQC 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 CY74FCT2240ATQC meets industry standards.

7.What is the process for return or replacement of CY74FCT2240ATQC?

All CY74FCT2240ATQC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT2240ATQC, 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 CY74FCT2240ATQC part is unused and in its original packaging.

Return procedure for CY74FCT2240ATQC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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