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Texas Instruments CY74FCT244TQCT
- Part No.:
- CY74FCT244TQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT244TQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,273
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Product details
Overview
CY74FCT244TQCT from Texas Instruments is an octal 3-state noninverting buffer/line driver used for memory address driving, clock distribution, and bus transceiver applications in TTL- and CMOS-compatible systems. It delivers 64-mA sink / 32-mA source output drive, 3.6-ns typical propagation delay (tPLH/tPHL), and operates from 4.75 V to 5.25 V across –40°C to +85°C.
For engineers reviewing the CY74FCT244TQCT datasheet, CY74FCT244TQCT pinout, CY74FCT244TQCT application, or CY74FCT244TQCT equivalent, key selection criteria include 3-state bus isolation capability, Ioff partial-power-down support, edge-rate controlled outputs for noise reduction, and compatibility with legacy TTL logic levels without level-shifting components.
Technical Context
The CY74FCT244TQCT implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), enabling selective activation of two 4-bit data paths. Its FCT-family silicon architecture provides bipolar-equivalent speed with CMOS power efficiency.
Edge-rate control circuitry limits dV/dt on outputs to suppress simultaneous switching noise, while the Ioff feature disables all outputs and limits leakage to ±1 µA when VCC = 0 V - critical for hot-swap and multi-rail system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation within industrial-grade 5-V rail tolerances. |
| Propagation Delay | 3.6 ns max (tPLH/tPHL) - supports high-speed bus timing up to ~275 MHz clock domains. |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads (e.g., >100 pF traces or multiple TTL inputs) without external buffers. |
| Ioff Leakage | ±1 µA at VCC = 0 V - prevents backfeed current during partial power-down, protecting powered subsystems. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - fully compatible with standard TTL logic levels (no level translation required). |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - exceeds JEDEC JESD22 standards for robust handling in manufacturing and field environments. |
Pinout & Package
CY74FCT244TQCT is housed in a 20-pin SSOP (Shrink Small Outline Package), DBQ drawing, 0.65-mm pitch, 7.2-mm width, RoHS-compliant NIPDAU lead finish, MSL Level-2-260°C-1 year rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OEA / OEB | Active-low 3-state enable inputs - independently control Group A (pins 2–9) and Group B (pins 12–19) output drivers. |
| 2, 4, 6, 8 | DA0–DA3 | Group A data inputs - routed to corresponding OA0–OA3 outputs when OEA = L. |
| 3, 5, 7, 9 | OA0–OA3 | Group A noninverting 3-state outputs - high-impedance when OEA = H. |
| 12, 14, 16, 18 | DB0–DB3 | Group B data inputs - routed to corresponding OB0–OB3 outputs when OEB = L. |
| 13, 15, 17, 19 | OB0–OB3 | Group B noninverting 3-state outputs - high-impedance when OEB = H. |
| 10 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in high-speed switching. |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF ceramic) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting slew rate - enables clean signal integrity on dense PCBs without added termination. |
| Ioff partial-power-down support | Prevents damaging current flow between live and unpowered sections - essential for hot-plug and mixed-voltage backplane designs. |
| TTL-compatible input thresholds | Direct interface with legacy 5-V TTL, NMOS, and CMOS logic - eliminates need for level shifters or pull-up resistors. |
| Matched rise/fall times | Minimizes duty-cycle distortion on clock or strobe signals - preserves timing margins in synchronous bus architectures. |
| High noise immunity | 200-mV input hysteresis (Vhys) - rejects transient noise on control lines like OE in electrically noisy industrial environments. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 16-bit address bus from microcontroller to SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state isolation - enables shared address/data bus arbitration via OE control. Use Value: 64-mA sink drive ensures full logic swing across 10-cm PCB traces loaded with 8+ memory devices; Ioff prevents backfeed during CPU reset. |
Use Scenario: Bidirectional data buffering between PLC CPU and I/O expansion modules over 24-V industrial backplane. IC Role / Device Role / Timing Role: Dual-group 3-state line driver - isolates faulted modules while maintaining communication on healthy segments. Use Value: Independent OEA/OEB enables per-module enable/disable; edge-rate control suppresses EMI in noisy factory environments. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
|
Use Scenario: Fan-out of 5-MHz system clock from FPGA to multiple peripheral ICs in avionics test rigs. IC Role / Device Role / Timing Role: Low-skew clock buffer - maintains phase alignment across 8 outputs with matched tPLH/tPHL. Use Value: 3.6-ns max propagation delay and <0.5-ns skew ensure setup/hold compliance for synchronous peripherals operating at 50-MHz effective rate. |
Use Scenario: Interfacing digital pattern generator outputs to DUT inputs requiring TTL-level signaling and load isolation. IC Role / Device Role / Timing Role: 3-state driver with configurable group enables - allows dynamic reconfiguration of stimulus channels without hardware changes. Use Value: 32-mA source capability drives 50-Ω coaxial cables directly; Ioff protects generator outputs during DUT power cycling. |
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 |
|---|---|---|---|
| SN74FCT244ATPWR | Same FCT family, identical pinout and DC specs, but rated for –40°C to +85°C with 4.6-ns max tPLH. | Slightly slower propagation delay; otherwise drop-in compatible in non-critical timing paths. | Select when cost sensitivity outweighs 1-ns timing margin requirements. |
| 74ACT244SCX | ACT-family device: higher VOH (≥4.4 V), lower IOL (24 mA), no Ioff, 10.5-ns max tPLH. | Lacks partial-power-down protection and edge-rate control; unsuitable for hot-swap or noise-sensitive designs. | Choose only for legacy ACT-system upgrades where Ioff and noise control are not required. |
Compared with SN74FCT244ATPWR and 74ACT244SCX, CY74FCT244TQCT uniquely combines sub-4-ns speed, Ioff-enabled power sequencing, and edge-rate noise suppression - making it optimal for modern industrial and test equipment where reliability, timing precision, and mixed-rail interoperability are mandatory.
Availability
CY74FCT244TQCT is available at Aetrix Electronics and suitable for industrial automation controllers, test instrumentation signal routing, and legacy-system memory expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for CY74FCT244TQCT 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 heritage in high-reliability logic families including FCT, ACT, and LVC.
CY74FCT244TQCT belongs to TI's military- and industrial-grade FCT logic series, designed specifically for robust 5-V bus interfacing in harsh environments where noise immunity, power sequencing, and long-term supply stability are critical.
FAQ
What is the maximum operating temperature range for CY74FCT244TQCT?
CY74FCT244TQCT is specified for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in programmable logic controllers, motor drives, and automated test equipment exposed to elevated thermal environments without derating. The SSOP package's θJA of 68°C/W enables reliable thermal performance under typical board layouts with moderate copper pour.
Does CY74FCT244TQCT support partial-power-down operation?
Yes, CY74FCT244TQCT features Ioff circuitry that actively disables outputs and limits leakage current to ±1 µA when VCC = 0 V. This allows safe insertion/removal in live backplanes and prevents current backflow into unpowered sections - a key requirement for modular industrial systems and hot-swap-capable instrumentation racks using CY74FCT244TQCT.
Can CY74FCT244TQCT directly interface with standard TTL logic inputs?
Yes, CY74FCT244TQCT has VIH = 2.0 V (min) and VIL = 0.8 V (max), matching standard TTL voltage thresholds. Its outputs deliver VOH ≥ 2.4 V (at –32 mA) and VOL ≤ 0.55 V (at 64 mA), ensuring full logic-level compatibility with 74LS, 74ALS, and other TTL families - no external pull-ups or level translators needed when using CY74FCT244TQCT in mixed-logic systems.
What is the purpose of the edge-rate control in CY74FCT244TQCT?
The edge-rate control circuitry in CY74FCT244TQCT intentionally limits output slew rate to reduce simultaneous switching noise (SSN) and electromagnetic interference (EMI). This design feature minimizes ground bounce and crosstalk on densely routed PCBs - especially valuable in high-pin-count industrial controllers where CY74FCT244TQCT drives multiple parallel bus lines sharing common return paths.
Is CY74FCT244TQCT pin-compatible with other FCT-series octal buffers?
Yes, CY74FCT244TQCT shares identical pinout and function mapping with CY74FCT244ATQCT, CY74FCT244CTQCT, and CY74FCT244DTQCT - differing only in propagation delay (3.6 ns vs. 4.0/4.1/4.6 ns) and output drive strength. All use the same SSOP-20 (DBQ) package, enabling direct substitution in timing-tolerant designs without layout changes when using CY74FCT244TQCT.
CY74FCT244TQCT 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:
- 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-SSOP
CY74FCT244TQCT FAQ
1.How can I place an order for CY74FCT244TQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244TQCT 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 CY74FCT244TQCT reliable?
The price and inventory of CY74FCT244TQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244TQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT244TQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244TQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244TQCT?
CY74FCT244TQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244TQCT 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 CY74FCT244TQCT?
For technical support, including CY74FCT244TQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244TQCT requirements.
6.How does Aetrix verify that CY74FCT244TQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT244TQCT 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 CY74FCT244TQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT244TQCT?
All CY74FCT244TQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244TQCT, 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 CY74FCT244TQCT part is unused and in its original packaging.
Return procedure for CY74FCT244TQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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