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Texas Instruments CY74FCT540CTQCT
- Part No.:
- CY74FCT540CTQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT540CTQCT.pdf
- Description:
- IC BUF INVERT 5.25V 20SSOP/QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:955
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Product details
Overview
CY74FCT540CTQCT from Texas Instruments is an 8-bit inverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution, bus transceivers, and TTL/CMOS interface applications. It delivers 64-mA sink / 32-mA source drive strength, 4.1-ns typical propagation delay, and operates across –40°C to 85°C with 4.75–5.25-V supply. Its Ioff circuitry enables safe partial-power-down operation in mixed-voltage systems.
For engineers reviewing the CY74FCT540CTQCT datasheet, CY74FCT540CTQCT pinout, CY74FCT540CTQCT application, or CY74FCT540CTQCT equivalent, key selection criteria include 3-state output control timing (tPZL/tPHZ ≤ 5.2 ns), matched rise/fall times, edge-rate-controlled noise immunity, and compatibility with TTL input thresholds and 3.3-V VOH logic levels.
Technical Context
This device implements dual active-low 3-state enable inputs (OEA and OEB) controlling eight inverting buffer channels. Each channel features symmetrical edge-rate control circuitry to suppress simultaneous switching noise and ensure matched tPLH/tPHL (1.5–4.1 ns) and tPZL/tPHZ (1.5–5.2 ns) characteristics.
It supports full TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), delivers VOH ≥ 2.4 V at –32 mA, and VOL ≤ 0.55 V at 64 mA sink - enabling direct interfacing with legacy TTL, NMOS, and CMOS loads without level shifters. Ioff protection limits backflow current to ±1 µA when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting 8-bit buffer with dual 3-state enables (OEA/OEB) |
| Propagation Delay | 1.5–4.1 ns (D→O); ensures sub-5-ns timing margin for 100-MHz bus cycles |
| Output Drive | 64-mA sink / 32-mA source; drives heavy capacitive loads or multiple TTL inputs |
| Supply Voltage | 4.75–5.25 V; tight regulation required for stable VOH/VOL across temperature |
| Ioff Current | ±1 µA at VCC = 0 V; prevents damage during hot-insertion or partial power-down |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V; fully compatible with standard TTL logic levels |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM; meets industrial handling requirements |
Pinout & Package
Package: 20-pin SSOP (DBQ), body size 7.2 × 5.3 mm, 0.65-mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA | Active-low output enable A; controls O0–O7 when asserted low |
| 2, 18 | D0, D1 | Inverting data inputs; drive corresponding O0/O1 outputs |
| 3–8 | D2–D7 | Inverting data inputs for remaining six channels |
| 9 | GND | Ground reference for all logic and output stages |
| 10 | VCC | Positive supply (4.75–5.25 V); powers internal logic and output drivers |
| 11 | OEB | Active-low output enable B; ORed with OEA for combined 3-state control |
| 12–17 | O0–O5 | Inverting 3-state outputs; high-impedance when OEA/OEB high |
| 20 | O6, O7 | Last two inverting 3-state outputs (pin 20 is O7; pin 12 is O0 per top-view diagram) |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting di/dt without sacrificing speed |
| Matched tPLH/tPHL | Ensures minimal duty-cycle distortion on clock or data signals routed through multiple channels |
| Ioff partial-power-down support | Enables live insertion into powered-backplane systems without latch-up or backfeed risk |
| TTL-compatible input thresholds | Eliminates need for external pull-ups or level translators when interfacing with legacy 5-V logic |
| Reduced VOH (typ. 3.3 V) | Improves noise margin vs. standard 5-V TTL while maintaining interoperability |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM chips in a PLC backplane. IC Role / Device Role / Timing Role: Inverting address buffer with dual 3-state enables synchronizing chip-select handshaking. Use Value: 64-mA sink capability ensures clean signal integrity across 15-cm traces loaded with 50 pF per device; 4.1-ns delay enables 100-MHz burst addressing. |
Use Scenario: Bidirectional data buffering between a CAN controller and isolated RS-485 transceiver in factory automation. IC Role / Device Role / Timing Role: Direction-controlled 3-state line driver isolating voltage domains during fault conditions. Use Value: Ioff protection prevents backfeed from powered RS-485 side into unpowered CAN domain; matched rise/fall times suppress EMI in noisy plant environments. |
| Legacy System Clock Distribution | TTL-to-CMOS Interface Bridge |
|
Use Scenario: Fan-out of a 25-MHz system clock to FPGA configuration logic, CPLD JTAG TCK, and ADC sampling clocks. IC Role / Device Role / Timing Role: Low-skew inverting clock buffer with independent enable control per channel group. Use Value: 1.5–4.1 ns tPLH/tPHL variation < ±0.5 ns across channels ensures < 1 ns inter-channel skew; edge-rate control minimizes jitter injection. |
Use Scenario: Interfacing 5-V TTL outputs from an industrial sensor module to 3.3-V CMOS inputs of an ARM-based gateway MCU. IC Role / Device Role / Timing Role: Level-shifting buffer leveraging TTL-compatible VIH/VIL and 3.3-V VOH to bridge voltage domains. Use Value: Guaranteed VOH ≥ 2.4 V at –32 mA satisfies 3.3-V CMOS VIH(min) = 2.0 V; no external resistors or translators needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74FCT540CTQCT | Same pinout, identical electrical specs, TI second-source marking; identical thermal and reliability profile | No functional difference; used interchangeably in TI-qualified industrial designs | Select when requiring TI's FCT family consistency and long-term obsolescence management |
| 74AC540SCX | Higher ICC (2.4 mA typical), slower tPLH/tPHL (6.5 ns max), no Ioff or edge-rate control | Lacks partial-power-down safety and noise suppression; unsuitable for hot-swap or high-noise environments | Consider only for cost-sensitive non-critical consumer applications where 5.25-V tolerance and 4.1-ns speed are not required |
Compared with SN74FCT540CTQCT (identical function and footprint) and 74AC540SCX (slower, no Ioff), CY74FCT540CTQCT uniquely combines 4.1-ns speed, 64-mA drive, Ioff protection, and edge-rate control - making it optimal for industrial bus buffering where reliability, noise immunity, and mixed-supply robustness are mandatory.
Availability
CY74FCT540CTQCT is available at Aetrix Electronics and suitable for industrial PLCs, factory automation gateways, legacy system upgrades, and embedded instrumentation requiring stable component supply over extended product lifecycles.
Supply support for CY74FCT540CTQCT 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.
CY74FCT540CTQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible 5-V digital interfacing in mission-critical industrial and military-grade systems.
FAQ
What is the maximum operating temperature range for CY74FCT540CTQCT?
CY74FCT540CTQCT is rated for continuous operation from –40°C to +85°C ambient temperature. This range is validated per TI's recommended operating conditions and supported by thermal impedance (θJA = 68°C/W) and derating curves in the official datasheet. The device maintains full electrical performance-including 4.1-ns propagation delay and 64-mA output drive-across this entire industrial temperature span.
Does CY74FCT540CTQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT540CTQCT includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This allows safe insertion into a live backplane or operation in systems where some rails are powered down while others remain active-critical for redundant power architectures and modular industrial controllers using CY74FCT540CTQCT as a bus buffer.
What is the meaning of "edge-rate control" in CY74FCT540CTQCT?
Edge-rate control in CY74FCT540CTQCT refers to internal circuitry that intentionally limits the slew rate of output transitions, reducing di/dt-induced noise and electromagnetic interference. Unlike fixed-slew devices, this feature maintains fast 4.1-ns propagation while suppressing simultaneous switching noise-verified by TI's characterization showing significantly improved noise characteristics versus standard FCT buffers.
Can CY74FCT540CTQCT directly interface with 3.3-V CMOS inputs?
Yes, CY74FCT540CTQCT delivers VOH ≥ 2.4 V at –32 mA (typ. 3.3 V), exceeding the 2.0 V minimum VIH requirement of standard 3.3-V CMOS logic. Its TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) also accept 3.3-V outputs directly. No level-shifter or pull-up resistors are needed when connecting CY74FCT540CTQCT to 3.3-V CMOS devices.
What package type and moisture sensitivity level does CY74FCT540CTQCT use?
CY74FCT540CTQCT uses a 20-pin SSOP (DBQ) package with 0.65-mm lead pitch and NIPDAU lead finish. It carries a JEDEC MSL Level-2 rating (260°C peak reflow, 1-year floor life), requiring storage in dry packs and bake conditioning only if exposed >1 year after seal opening-fully compliant with IPC/JEDEC J-STD-020 standards for surface-mount assembly.
CY74FCT540CTQCT 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, 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
CY74FCT540CTQCT FAQ
1.How can I place an order for CY74FCT540CTQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT540CTQCT 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 CY74FCT540CTQCT reliable?
The price and inventory of CY74FCT540CTQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT540CTQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT540CTQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT540CTQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT540CTQCT?
CY74FCT540CTQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT540CTQCT 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 CY74FCT540CTQCT?
For technical support, including CY74FCT540CTQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT540CTQCT requirements.
6.How does Aetrix verify that CY74FCT540CTQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT540CTQCT 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 CY74FCT540CTQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT540CTQCT?
All CY74FCT540CTQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT540CTQCT, 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 CY74FCT540CTQCT part is unused and in its original packaging.
Return procedure for CY74FCT540CTQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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