My Inquiry
My Account
Texas Instruments CY74FCT240TSOCT
- Part No.:
- CY74FCT240TSOCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT240TSOCT.pdf
- Description:
- IC BUFFER INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,669
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY74FCT240TSOCT from Texas Instruments is an octal 3-state noninverting buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications. It features 64-mA sink / 32-mA source output drive, 8 ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels.
For engineers reviewing the CY74FCT240TSOCT datasheet, CY74FCT240TSOCT pinout, CY74FCT240TSOCT application, or CY74FCT240TSOCT equivalent, key selection criteria include 3-state bus isolation capability, industrial temperature range (–40°C to +85°C), SOIC-20 package compatibility, and FCT-family functional equivalence with reduced power versus bipolar logic.
Technical Context
The CY74FCT240TSOCT implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus interface configurations. Its edge-rate control circuitry limits di/dt to improve noise immunity without external components.
It operates from a single 4.75–5.25 V supply, supports Ioff protection during partial power-down, and maintains valid high-impedance outputs when VCC = 0 V. Input thresholds meet TTL standards (VIH = 2 V min, VIL = 0.8 V max), ensuring direct interfacing with legacy TTL, NMOS, and CMOS systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - Ensures stable operation across industrial-grade 5-V rail tolerances. |
| Output Drive | 64 mA sink / 32 mA source - Sufficient to drive heavy capacitive loads or multiple TTL inputs without buffering. |
| Propagation Delay | 8 ns max (tPLH/tPHL) - Enables reliable timing in 125-MHz bus systems with margin. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow current during hot-insertion or partial system power-down. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial and commercial embedded environments. |
| Input Compatibility | TTL-level VIH/VIL (2 V / 0.8 V) - Direct connection to 74LS, 74ALS, and microcontroller GPIO without level shifters. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA / OEB | Active-low 3-state enable inputs - Independently control upper/lower 4-bit buffer sections. |
| 2–5, 13–16 | DA0–DA3 / DB0–DB3 | Data inputs - Accept TTL/CMOS logic signals for buffering. |
| 6–9, 11–14 | OA0–OA3 / OB0–OB3 | Noninverting 3-state outputs - Drive buses or clocks with controlled impedance and slew rate. |
| 10 | GND | Ground reference - Shared return path for all digital signals and power. |
| 20 | VCC | Positive supply - Powers internal logic and output drivers; bypassing required per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Controlled output slew limits EMI and reduces ground bounce in dense PCB layouts. |
| Ioff partial-power-down | Enables safe insertion into live backplanes by disabling outputs when VCC is unpowered. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clock or data lines critical for synchronous timing. |
| Function & pinout compatibility | Drop-in replacement for CY54FCT240T and industry-standard FCT240 logic in SOIC-20 footprint. |
| Reduced VOH | Typical 3.3 V VOH at 32-mA source simplifies interfacing with mixed-voltage 3.3-V/5-V systems. |
Applications
| Memory Address Driving | Clock Distribution |
|---|---|
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 isolation prevents contention during address decoding cycles. Use Value: 64-mA sink drive ensures clean signal edges across 100+ pF trace capacitance; Ioff protects during CPU reset sequences. | Use Scenario: Distributing a master system clock to multiple peripherals (ADCs, DACs, FPGAs) with matched skew. IC Role / Device Role / Timing Role: Low-skew, low-jitter fanout buffer maintaining TTL logic levels and edge integrity. Use Value: Matched rise/fall times (<1 ns delta) and 8 ns max tPLH/tPHL preserve 125-MHz timing margins. |
| Bus Transceiver Interface | Legacy System Glue Logic |
Use Scenario: Bidirectional data bus isolation between a 32-bit processor and peripheral ASIC using separate OE controls. IC Role / Device Role / Timing Role: Dual 4-bit section enables half-bus direction control (e.g., DA0–DA3 → OA0–OA3 for write, DB0–DB3 ← OB0–OB3 for read). Use Value: Independent OEA/OEB pins allow precise timing of bus turnarounds without added logic gates. | Use Scenario: Interfacing modern microcontrollers with legacy TTL-based instrumentation subsystems (e.g., GPIB controllers, test equipment). IC Role / Device Role / Timing Role: Level-translation and drive-strengthening buffer eliminating need for discrete resistors or additional drivers. Use Value: Native TTL input thresholds and 32-mA source capability directly drive 74LS-series loads without external pull-ups. |
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 –40°C to +85°C with 64-mA/32-mA drive and 8 ns delay. | No functional difference; TI's second-source marking for CY74FCT240TSOCT in tape-and-reel format. | Select when requiring TI's standard branded part number or alternate logistics packaging. |
| 74AC240SCX | Higher speed (5.5 ns max), lower drive (24 mA sink), wider VCC range (2–6 V), but no Ioff or edge-rate control. | Suitable for low-power, wide-supply designs where partial-power-down is not required. | Choose only if system requires sub-6 ns timing and operates outside 4.75–5.25 V; verify noise immunity and hot-swap safety separately. |
Compared with SN74FCT240NSR, CY74FCT240TSOCT offers identical electrical and mechanical behavior as a direct TI-manufactured variant; versus 74AC240SCX, it trades raw speed for robust industrial bus driving, Ioff protection, and controlled edge rates essential for noise-sensitive applications.
Availability
CY74FCT240TSOCT is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial bus interfaces, and legacy system upgrades requiring stable component supply over extended production lifecycles.
Supply support for CY74FCT240TSOCT 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 decades of industrial-grade reliability validation.
The CY74FCT240TSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise bus interface applications in industrial control, communications infrastructure, and computing systems requiring TTL compatibility and robust thermal performance.
FAQ
What is the maximum operating temperature range for CY74FCT240TSOCT?
CY74FCT240TSOCT is specified for continuous operation from –40°C to +85°C ambient temperature, meeting industrial-grade environmental requirements. This range is validated across all electrical parameters including propagation delay, output drive, and Ioff leakage, and applies to the SOIC-20 (DW) package under recommended PCB layout and thermal conditions.
Does CY74FCT240TSOCT support partial-power-down mode?
Yes, CY74FCT240TSOCT includes Ioff circuitry that disables outputs and limits current to ±1 µA when VCC = 0 V, enabling safe partial-power-down operation. This feature prevents damaging backflow current during hot-swap events or subsystem power sequencing, and is fully characterized per JESD78.
What are the absolute maximum ratings for CY74FCT240TSOCT supply voltage?
The absolute maximum supply voltage for CY74FCT240TSOCT is –0.5 V to 7 V relative to GND. Exceeding this range may cause permanent damage. The recommended operating range is strictly 4.75 V to 5.25 V for full parameter compliance, as defined in the SCCS017A datasheet revision October 2001.
Is CY74FCT240TSOCT pin-compatible with CY54FCT240T?
Yes, CY74FCT240TSOCT shares identical pinout, function table, and logic diagram with CY54FCT240T in SOIC-20 packaging. Both devices use the same terminal numbering, enable/control signal mapping, and I/O assignment - confirmed in TI's SCCS017A datasheet Figures 1 and 2 for SO and Q packages.
What is the typical VOH and VOL for CY74FCT240TSOCT at rated load?
At VCC = 4.75 V and IOH = –32 mA, CY74FCT240TSOCT delivers typical VOH = 3.3 V; at IOL = 64 mA, typical VOL = 0.3 V. These values ensure robust noise margins (>0.7 V) against TTL input thresholds and support reliable interfacing with legacy 5-V logic families without external termination.
CY74FCT240TSOCT 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:
- 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:
- 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
CY74FCT240TSOCT FAQ
1.How can I place an order for CY74FCT240TSOCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT240TSOCT 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 CY74FCT240TSOCT reliable?
The price and inventory of CY74FCT240TSOCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT240TSOCT is usually 5 days.
3.What payment methods are accepted for CY74FCT240TSOCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT240TSOCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT240TSOCT?
CY74FCT240TSOCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT240TSOCT 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 CY74FCT240TSOCT?
For technical support, including CY74FCT240TSOCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT240TSOCT requirements.
6.How does Aetrix verify that CY74FCT240TSOCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT240TSOCT 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 CY74FCT240TSOCT meets industry standards.
7.What is the process for return or replacement of CY74FCT240TSOCT?
All CY74FCT240TSOCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT240TSOCT, 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 CY74FCT240TSOCT part is unused and in its original packaging.
Return procedure for CY74FCT240TSOCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY74FCT240TSOCT 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…
