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Texas Instruments CY74FCT541CTQCT
- Part No.:
- CY74FCT541CTQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT541CTQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
CY74FCT541CTQCT from Texas Instruments is an 8-bit noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution in TTL- and CMOS-compatible systems. It delivers 64-mA sink and 32-mA source drive at 5-V supply, features edge-rate control for noise reduction, supports partial-power-down via Ioff, and operates from –40°C to 85°C in a 20-pin QSOP package.
For engineers reviewing the CY74FCT541CTQCT datasheet, CY74FCT541CTQCT pinout, CY74FCT541CTQCT application, or CY74FCT541CTQCT equivalent, key selection considerations include its 4.1-ns propagation delay (tPLH/tPHL), 3.3-V typical VOH, Ioff-enabled bus isolation, and compatibility with FCT/F logic families in high-noise industrial and embedded bus interfaces.
Technical Context
This device implements dual 3-state output enables (OEA and OEB) controlling eight independent noninverting buffer channels. Its edge-rate control circuitry limits slew rate to reduce simultaneous switching noise, while the Ioff feature disables outputs and blocks current flow when VCC = 0 V-enabling safe hot-insertion and partial power-down in mixed-voltage systems.
It is fully compatible with TTL input thresholds (VIH = 2 V min, VIL = 0.8 V max) and provides CMOS-level outputs (VOH ≥ 2.4 V at –32 mA, VOL ≤ 0.55 V at 64 mA). Input and output voltage ranges extend to –0.5 V to 7 V, supporting robust interfacing across legacy and modern logic families without level-shifting components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (tPLH/tPHL) | 1.5–4.1 ns - Enables high-speed data routing in 25-MHz+ address/data buses. |
| Output Drive (IOL/IOH) | 64 mA sink / 32 mA source - Drives heavy capacitive loads and multiple TTL inputs without external buffers. |
| Supply Voltage Range | 4.75–5.25 V - Matches standard 5-V rail tolerances and ensures stable operation under line regulation variation. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow current during power sequencing, protecting powered subsystems. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade ESD immunity requirements without external protection. |
| Input Capacitance (Ci) | 5–10 pF - Minimizes loading on upstream drivers and preserves signal integrity in fanout-critical paths. |
| Operating Temperature | –40°C to +85°C - Qualified for commercial and extended-temperature industrial environments. |
Pinout & Package
Package: 20-pin QSOP (SSOP, DBQ), 0.154-inch body width, 0.65-mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OEA | Output Enable A | Active-low enable for D0–D3 → O0–O3; controls first half of 8-bit channel group. |
| OEB | Output Enable B | Active-low enable for D4–D7 → O4–O7; enables independent gating of second half. |
| D0–D7 | Data Inputs | CMOS/TTL-compatible inputs accepting 0.8 V/2.0 V thresholds; no external pull-ups required. |
| O0–O7 | 3-State Outputs | Noninverting buffered outputs; high-impedance state when OEA or OEB is high. |
| VCC | Power Supply | 5-V nominal supply; decoupling capacitor required within 1 cm for noise-sensitive applications. |
| GND | Ground Reference | Signal and power return; must be low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Controlled Outputs | Reduced di/dt limits simultaneous switching noise (SSN), improving signal integrity on dense PCBs. |
| Ioff Partial-Power-Down Support | Enables safe insertion/removal in live backplanes and prevents backfeeding into unpowered sections. |
| Matched Rise/Fall Times | Ensures symmetrical waveform edges, minimizing duty-cycle distortion in clock distribution paths. |
| TTL-Compatible Input Levels | Direct interface with legacy TTL without level shifters or resistive biasing networks. |
| 3.3-V Typical VOH | Provides margin for interfacing with 3.3-V CMOS receivers while operating from 5-V supply. |
Applications
| Memory Address Buffering | 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 isolating MCU outputs and boosting drive strength to meet setup/hold timing across 10+ cm traces. Use Value: Eliminates need for discrete transistor arrays; 64-mA sink capability ensures reliable low-level signaling under 50-pF load. | Use Scenario: Distributing a system clock to multiple peripherals (ADC, DAC, FPGA config logic) with matched skew. IC Role / Device Role / Timing Role: Low-skew, low-jitter fanout buffer maintaining signal integrity across parallel clock branches. Use Value: Edge-rate control reduces crosstalk-induced jitter; 4.1-ns tPLH/tPHL ensures sub-250-ps skew between outputs. |
| Bus Transceiver Interface | Legacy System Interfacing |
Use Scenario: Bidirectional data bus isolation between a 5-V microprocessor and peripheral ICs sharing a common data path. IC Role / Device Role / Timing Role: Unidirectional 3-state transmitter enabling controlled data flow direction without contention. Use Value: Dual OE pins allow interleaved enable control for time-multiplexed bus access; Ioff prevents power-domain conflicts. | Use Scenario: Integrating new 5-V logic into legacy equipment using TTL-level control signals (e.g., industrial PLC I/O modules). IC Role / Device Role / Timing Role: Level-translation buffer preserving TTL-compatible VIH/VIL while driving modern CMOS loads. Use Value: Direct drop-in replacement for 74LS244; eliminates external pull-up resistors and reduces board space by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT244ATPWR | Same 20-pin SSOP package, identical 64-mA/32-mA drive, but rated for 4.8-ns max tPLH (slower than CY74FCT541CTQCT's 4.1 ns). | Valid for cost-sensitive designs where 0.7-ns timing margin is acceptable; same Ioff and ESD specs. | Select when prioritizing second-source availability over minimal propagation delay. |
| 74AC244SCX | Higher VOH (≥4.2 V), faster tPLH (2.5 ns typ), but no Ioff support and only 24-mA drive - incompatible with partial-power-down systems. | Suitable for high-speed, always-powered logic interconnects; not usable in hot-swap or multi-rail power domains. | Choose only if Ioff is unnecessary and higher output voltage is required for downstream 5-V CMOS inputs. |
Compared with SN74FCT244ATPWR and 74AC244SCX, the CY74FCT541CTQCT uniquely balances ultra-fast 4.1-ns timing, robust 64-mA drive, and essential Ioff functionality-making it the optimal choice for industrial bus interfaces requiring both performance and power-domain safety.
Availability
CY74FCT541CTQCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus transceiver interfacing, and legacy system integration requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for CY74FCT541CTQCT 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 CY74FCT541CTQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical industrial and embedded systems.
FAQ
What is the maximum propagation delay of the CY74FCT541CTQCT at 5 V?
The CY74FCT541CTQCT has a maximum propagation delay (tPLH/tPHL) of 4.1 ns over the full operating temperature range (–40°C to +85°C) at VCC = 4.75–5.25 V. This value is specified for the 'C' speed grade and confirmed in the SCCS072 datasheet switching characteristics table under CY74FCT541CT conditions.
Does the CY74FCT541CTQCT support partial-power-down operation?
Yes, the CY74FCT541CTQCT supports partial-power-down operation via its Ioff feature. When VCC = 0 V, the outputs enter a high-impedance state and leakage current is limited to ±1 µA, preventing damaging backflow current into powered sections of the system-a critical capability for hot-plug and multi-rail architectures.
What package type and lead finish does the CY74FCT541CTQCT use?
The CY74FCT541CTQCT uses a 20-pin QSOP (SSOP, DBQ) package with a 0.65-mm lead pitch and RoHS-compliant NIPDAU (nickel/palladium/gold) lead finish. It is supplied in tape-and-reel format (2500 units per reel) and carries an MSL Level-2 rating (260°C peak reflow, 1-year floor life).
Can the CY74FCT541CTQCT directly interface with 3.3-V logic inputs?
Yes, the CY74FCT541CTQCT can interface with 3.3-V logic inputs because its typical VOH is 3.3 V (min 2.4 V at –32 mA), providing sufficient margin above the 2.0-V VIH threshold of most 3.3-V CMOS devices. However, ensure the 3.3-V device's absolute maximum input voltage rating (typically 3.6 V) is not exceeded under worst-case VCC and load conditions.
How many independent 3-state enable controls does the CY74FCT541CTQCT provide?
The CY74FCT541CTQCT provides two independent active-low 3-state enable controls: OEA governs outputs O0–O3, and OEB governs outputs O4–O7. This allows segmented bus control-for example, enabling only upper or lower nibbles of an 8-bit data path-without requiring external logic or additional ICs.
CY74FCT541CTQCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, 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-SSOP
CY74FCT541CTQCT FAQ
1.How can I place an order for CY74FCT541CTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT541CTQCT 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 CY74FCT541CTQCT reliable?
The price and inventory of CY74FCT541CTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT541CTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT541CTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT541CTQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT541CTQCT?
CY74FCT541CTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT541CTQCT 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 CY74FCT541CTQCT?
For technical support, including CY74FCT541CTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT541CTQCT requirements.
6.How does Aetrix verify that CY74FCT541CTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT541CTQCT 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 CY74FCT541CTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT541CTQCT?
All CY74FCT541CTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT541CTQCT, 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 CY74FCT541CTQCT part is unused and in its original packaging.
Return procedure for CY74FCT541CTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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