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Texas Instruments CY74FCT541ATQCT
- Part No.:
- CY74FCT541ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT541ATQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,926
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Product details
Overview
CY74FCT541ATQCT from Texas Instruments is an 8-bit noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution, bus interfacing, and TTL/CMOS level translation. It delivers 64-mA sink and 32-mA source drive at 5-V operation, features Ioff partial-power-down protection, and uses edge-rate control for low-noise performance in industrial and embedded systems.
For engineers reviewing the CY74FCT541ATQCT datasheet, CY74FCT541ATQCT pinout, CY74FCT541ATQCT application, or CY74FCT541ATQCT equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 4.8 ns), dual enable control (OEA/OEB), Ioff current (±1 µA at VCC = 0 V), and SSOP-20 package compatibility with high-density PCB layouts.
Technical Context
This device implements dual independent 3-state enables (OEA and OEB) to control eight noninverting output channels simultaneously. Its edge-rate control circuitry limits slew rate to reduce simultaneous switching noise, while matched rise/fall times ensure clean signal integrity across all outputs.
The Ioff feature actively disables outputs when VCC = 0 V, blocking backflow current up to ±1 µA - critical for hot-swap and partial-power-down system architectures. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output levels (VOH = 2.4 V min, VOL = 0.55 V max) guarantee full TTL and CMOS interoperability without level-shifting components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within industrial 5-V rail tolerances |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns - supports high-speed bus timing up to ~200 MHz data rates |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >100 pF) or multiple TTL inputs |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging backfeed during power sequencing or hot insertion |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - directly interfaces 5-V TTL, NMOS, and CMOS logic families |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 for board-level robustness |
| Operating Temp | –40°C to +85°C - qualified for commercial and extended-temperature industrial environments |
Pinout & Package
Package: SSOP-20 (DBQ), 0.635-mm pitch, 7.2-mm width, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA, OEB | Active-low dual output enable controls - both must be low for output assertion; independent gating enables flexible bus arbitration |
| 2–9 | D0–D7 | Noninverting data inputs - accept TTL/CMOS logic levels; internally terminated to prevent floating |
| 11–18 | O0–O7 | 3-state buffered outputs - high-impedance state (Z) when either OEA or OEB is high |
| 10 | GND | Ground reference - decoupling capacitor placement near this pin minimizes ground bounce |
| 20 | VCC | 5-V supply - requires local 0.1-µF ceramic bypass capacitor to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3-state enables (OEA/OEB) | Enables independent bus segment control and reduces contention risk in multi-driver systems |
| Edge-rate controlled outputs | Reduces EMI and crosstalk by limiting dV/dt - verified via measured noise characteristics in application reports |
| Ioff partial-power-down support | Prevents current backflow when VCC is off - essential for FPGA I/O banks and hot-pluggable modules |
| TTL/CMOS input/output compatibility | Eliminates external level shifters in mixed-logic designs - VIH/VIL and VOH/VOL meet both families' specs |
| Matched rise/fall times | Ensures symmetrical waveform edges - critical for clock distribution and setup/hold timing margin |
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 isolating controller outputs from capacitive bus loading while maintaining timing integrity. Use Value: Delivers 64-mA sink current to overcome trace capacitance and fanout delays, ensuring reliable address latching across temperature. | Use Scenario: Distributing a master system clock to multiple peripheral ICs with minimal skew and jitter. IC Role / Device Role / Timing Role: Low-skew, edge-controlled line driver preserving signal edge fidelity across parallel clock paths. Use Value: Matched rise/fall times and sub-5-ns propagation delay maintain tight clock-to-clock skew (<1 ns) in synchronous designs. |
| Bus Transceiver Interface | Partial-Power-Down System Control |
Use Scenario: Bidirectional data routing between processor and peripheral ASIC using shared data bus with direction control. IC Role / Device Role / Timing Role: Unidirectional 3-state buffer enabling clean bus release during direction transitions. Use Value: Dual OEA/OEB allows staggered enable/disable sequencing to avoid bus contention during state changes. | Use Scenario: Isolating powered-down subsystems (e.g., USB PHY, sensor hub) from active logic rails in battery-powered equipment. IC Role / Device Role / Timing Role: Ioff-enabled buffer preventing reverse current flow when downstream VCC is removed. Use Value: ±1 µA Ioff leakage ensures safe power sequencing without external isolation FETs or diodes. |
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 |
|---|---|---|---|
| SN74FCT541ATPWR | Same function, SOIC-20 package, 4.8-ns max tPLH, identical Ioff and drive specs | Requires PCB layout change due to SOIC vs. SSOP footprint; thermal resistance higher (58°C/W vs. 68°C/W) | Select when SOIC assembly infrastructure is preferred and board space permits larger package |
| 74AC541SCX | Lower drive (24-mA sink), no Ioff, 10-ns max tPLH, wider VCC range (2–6 V) | Not suitable for partial-power-down systems; lacks edge-rate control and fails ESD requirements (HBM < 2000 V) | Use only in cost-sensitive, non-critical applications where power sequencing is not required |
Compared with SN74FCT541ATPWR and 74AC541SCX, CY74FCT541ATQCT uniquely combines SSOP-20 compactness, industrial temperature rating, Ioff safety, and edge-rate noise suppression - making it optimal for space-constrained, robust industrial bus interfaces.
Availability
CY74FCT541ATQCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution networks, and bus transceiver interfaces requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for CY74FCT541ATQCT 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 with emphasis on reliability, longevity, and industrial-grade qualification.
CY74FCT541ATQCT belongs to the TI FCT logic family - engineered for high-speed, low-noise, 5-V TTL-compatible digital interfacing in mission-critical industrial and communications infrastructure.
FAQ
What is the maximum operating frequency supported by CY74FCT541ATQCT in a typical bus application?
CY74FCT541ATQCT does not specify a maximum clock frequency directly, but its 4.8-ns maximum propagation delay (tPLH/tPHL) and 5.2-ns maximum enable/disable times support reliable operation in bus systems with data rates up to approximately 200 MHz under controlled load conditions (CL ≤ 50 pF). Actual usable frequency depends on trace length, termination, and capacitive loading - design validation with IBIS models is recommended for >100-MHz implementations. CY74FCT541ATQCT maintains timing margins across –40°C to +85°C.
Does CY74FCT541ATQCT support hot-swap or live-insertion into a powered-backplane system?
Yes, CY74FCT541ATQCT supports hot-swap via its Ioff circuitry, which limits reverse current to ±1 µA when VCC = 0 V - preventing damage during live insertion. However, proper backplane design (e.g., staggered pin lengths, series resistors on data lines) remains essential. The device's 2000-V HBM ESD rating further enhances robustness during handling and insertion. CY74FCT541ATQCT must be powered before enabling outputs in operational mode.
Can CY74FCT541ATQCT interface directly with 3.3-V logic devices?
CY74FCT541ATQCT is a 5-V-only device with TTL-compatible inputs (VIH = 2 V min), so it accepts 3.3-V logic-high signals safely. However, its outputs swing to ~3.3 V (typical VOH) under 32-mA load - sufficient to drive 3.3-V CMOS inputs (VIH ≥ 2.0 V), but marginal for 3.3-V TTL. For guaranteed compatibility, use with 3.3-V devices rated for TTL input thresholds or add series resistors to limit current. CY74FCT541ATQCT is not 3.3-V supply compatible.
What is the purpose of the two enable pins (OEA and OEB) on CY74FCT541ATQCT?
OEA and OEB are independent active-low 3-state enables: outputs go high-impedance if *either* pin is high. This allows flexible bus control - e.g., OEA can serve as global enable while OEB acts as local arbitration signal, or both can be tied together for simple single-enable operation. The dual-enable architecture reduces external logic in multi-segment bus systems. CY74FCT541ATQCT asserts outputs only when both OEA and OEB are low.
Is CY74FCT541ATQCT RoHS compliant and lead-free?
Yes, CY74FCT541ATQCT is RoHS compliant and features NiPdAu (NIPDAU) lead finish per TI's packaging documentation. It meets JEDEC Level-2 moisture sensitivity (260°C peak reflow, 1-year floor life) and is supplied in tape-and-reel format (2500 units/reel). The part marking "FCT541A" and SSOP-20 (DBQ) package confirm full compliance with EU RoHS Directive 2011/65/EU. CY74FCT541ATQCT has no exemptions applied.
CY74FCT541ATQCT 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
CY74FCT541ATQCT FAQ
1.How can I place an order for CY74FCT541ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT541ATQCT 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 CY74FCT541ATQCT reliable?
The price and inventory of CY74FCT541ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT541ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT541ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT541ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT541ATQCT?
CY74FCT541ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT541ATQCT 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 CY74FCT541ATQCT?
For technical support, including CY74FCT541ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT541ATQCT requirements.
6.How does Aetrix verify that CY74FCT541ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT541ATQCT 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 CY74FCT541ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT541ATQCT?
All CY74FCT541ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT541ATQCT, 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 CY74FCT541ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT541ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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