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Texas Instruments CY74FCT244ATPC
- Part No.:
- CY74FCT244ATPC
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CY74FCT244ATPC.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,376
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Product details
Overview
CY74FCT244ATPC from Texas Instruments is an octal 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications in industrial and embedded systems. It features 64-mA sink / 32-mA source output drive, 4.6 ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels.
For engineers reviewing the CY74FCT244ATPC datasheet, CY74FCT244ATPC pinout, CY74FCT244ATPC application, or CY74FCT244ATPC equivalent, key selection criteria include its PDIP-20 package, –40°C to +85°C operating range, 4.75–5.25 V supply tolerance, edge-rate controlled outputs for noise reduction, and compatibility with FCT/F logic families.
Technical Context
The CY74FCT244ATPC implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus isolation. Its edge-rate control circuitry limits slew rate to suppress simultaneous switching noise, while the Ioff feature disables outputs and blocks current backflow during power-down states.
It operates at 5 V nominal supply with guaranteed TTL-level interfacing: VIH = 2 V min, VIL = 0.8 V max, VOH = 2.4 V min (at –32 mA), VOL = 0.55 V max (at 64 mA). Input hysteresis (Vhys = 0.2 V) enhances noise immunity on control lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Octal noninverting 3-state buffer/line driver with dual enable inputs |
| Propagation Delay | Max 4.6 ns (tPLH/tPHL at VCC = 5 V, CL = 50 pF) - enables high-speed bus timing in 25 MHz+ systems |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs without external buffering |
| Ioff Support | ±1 µA max Ioff at VCC = 0 V - prevents backfeed current during hot-swap or partial-power-down operation |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements |
| Supply Range | 4.75 V to 5.25 V - tight 5 V tolerance ensures stable operation under noisy rail conditions |
| Operating Temp | –40°C to +85°C - qualified for extended-temperature industrial environments |
Pinout & Package
Package: PDIP-20 (Plastic Dual In-line Package), 20-pin, 0.300-inch body width, RoHS-compliant NiPdAu lead finish, MSL not applicable (through-hole).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEA) | Output Enable A | Active-low enable for first 4-channel buffer group (OA0–OA3); asserts 3-state when high |
| 2–5 (DA0–DA3) | Data Inputs A | Noninverting inputs for OA0–OA3 outputs; TTL/CMOS compatible |
| 6–9 (OB0–OB3) | Outputs B | Noninverting outputs driven by DB0–DB3; 3-state when OEB = high |
| 10 (GND) | Ground | Reference return for all signals and power; must be low-impedance connection |
| 11 (VCC) | Power Supply | +5 V supply rail; bypassing with 0.1 µF ceramic capacitor near pin recommended |
| 12 (OEB) | Output Enable B | Active-low enable for second 4-channel buffer group (OB0–OB3) |
| 13–16 (OA0–OA3) | Outputs A | Noninverting outputs driven by DA0–DA3; isolated from OB group via separate enable |
| 17–20 (DB0–DB3) | Data Inputs B | Noninverting inputs for OB0–OB3 outputs; electrically identical to DA0–DA3 |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate control | Controlled output slew rate reduces simultaneous switching noise (SSN) and EMI in dense PCB layouts |
| Ioff partial-power-down | Enables safe operation in mixed-voltage or hot-plug systems by blocking reverse current flow when VCC = 0 V |
| Matched rise/fall times | tPLH ≈ tPHL ensures symmetrical waveform edges, minimizing duty-cycle distortion in clock distribution |
| TTL/CMOS/NMOS interface | No level-shifting components required - direct connection to legacy TTL and modern CMOS logic families |
| High noise immunity | 0.2 V input hysteresis (Vhys) rejects transient noise on enable and data lines in electrically noisy environments |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer isolating MCU address outputs while providing fanout and drive strength. Use Value: 64-mA sink capability supports >10 TTL loads per output; 4.6 ns delay preserves setup/hold timing margins. |
Use Scenario: Bidirectional data transfer between two processor subsystems sharing a common parallel bus. IC Role / Device Role / Timing Role: Dual-enable 3-state line driver enabling direction-controlled bus arbitration. Use Value: Independent OEA/OEB allows precise timing of A- and B-side enable transitions to prevent bus contention. |
| Clock Distribution Network | Legacy System Interface Adapter |
|
Use Scenario: Distributing a system clock signal to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs). IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with matched tPLH/tPHL for phase-aligned fanout. Use Value: Matched rise/fall times and 0.2 V hysteresis maintain clean clock edges across temperature and voltage variation. |
Use Scenario: Interfacing a modern 3.3 V microcontroller GPIO to legacy 5 V TTL peripherals (e.g., UART transceivers, display controllers). IC Role / Device Role / Timing Role: Level-tolerant buffer translating logic levels without external resistors or translators. Use Value: TTL-compatible VIH/VIL thresholds and 5 V supply allow direct connection to 5 V logic while accepting 3.3 V inputs safely. |
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 |
|---|---|---|---|
| SN74FCT244N | Same PDIP-20 package, identical pinout, but rated for 0°C to 70°C only; 4.6 ns delay same, but lower Ioff spec (±5 µA vs ±1 µA) | Limited to commercial-temperature applications; unsuitable for industrial ambient extremes | Select SN74FCT244N only if operating temperature stays within 0–70°C and Ioff robustness is not critical. |
| 74ACT244PC | PDIP-20, 5 V supply, but ACT family: higher speed (3.5 ns typ), higher ICC (20 mA vs 0.2 mA), no Ioff support | Higher power consumption and no partial-power-down capability; less suitable for hot-swap or battery-backed systems | Choose 74ACT244PC only when maximum speed is prioritized over power efficiency and Ioff safety. |
Compared with SN74FCT244N and 74ACT244PC, CY74FCT244ATPC delivers industrial temperature range, superior Ioff protection, and optimized noise performance - making it the preferred choice for ruggedized embedded bus interfaces where reliability and power sequencing matter.
Availability
CY74FCT244ATPC is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and embedded bus interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CY74FCT244ATPC 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 experience in high-reliability industrial and automotive IC design.
The CY74FCT244ATPC belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible buffering in mission-critical industrial and communications infrastructure applications.
FAQ
What is the maximum operating temperature range for the CY74FCT244ATPC?
The CY74FCT244ATPC is specified for continuous operation from –40°C to +85°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This rating is validated per JEDEC JESD78 and confirmed in TI's official ordering documentation for the PDIP-20 variant.
Does the CY74FCT244ATPC support partial-power-down functionality?
Yes, the CY74FCT244ATPC includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature is explicitly documented in the datasheet's "Recommended Operating Conditions" and "Electrical Characteristics" tables, enabling safe use in hot-swap and multi-rail systems.
What is the typical propagation delay of the CY74FCT244ATPC at 5 V supply?
The CY74FCT244ATPC has a maximum propagation delay of 4.6 ns (tPLH/tPHL) under standard test conditions (VCC = 5 V, CL = 50 pF, TA = 25°C). Typical delay is lower - approximately 3.2 ns - as confirmed in TI's switching characteristics table for the "AT" speed grade.
Can the CY74FCT244ATPC drive TTL loads directly without external components?
Yes, the CY74FCT244ATPC is fully TTL-compatible: its VOH ≥ 2.4 V (at –32 mA) and VOL ≤ 0.55 V (at 64 mA) meet TTL output specifications, while VIH = 2 V min and VIL = 0.8 V max satisfy TTL input thresholds - enabling direct interconnection with 74LS, 74ALS, and other TTL families.
Is the CY74FCT244ATPC pin-compatible with other FCT244 variants?
Yes, the CY74FCT244ATPC shares identical pinout and function with all CY74FCT244x variants in PDIP-20 (e.g., CY74FCT244CTPC, CY74FCT244TPC), including matching OEA/OEB enables, DA0–DA3/OA0–OA3, and DB0–DB3/OB0–OB3 assignments - verified in TI's "Logic Diagram" and "Pin Assignments" sections.
CY74FCT244ATPC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CY74FCT244ATPC FAQ
1.How can I place an order for CY74FCT244ATPC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244ATPC 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 CY74FCT244ATPC reliable?
The price and inventory of CY74FCT244ATPC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244ATPC is usually 5 days.
3.What payment methods are accepted for CY74FCT244ATPC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244ATPC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244ATPC?
CY74FCT244ATPC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244ATPC 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 CY74FCT244ATPC?
For technical support, including CY74FCT244ATPC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244ATPC requirements.
6.How does Aetrix verify that CY74FCT244ATPC is sourced from the original manufacturer or authorized distributors?
All CY74FCT244ATPC 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 CY74FCT244ATPC meets industry standards.
7.What is the process for return or replacement of CY74FCT244ATPC?
All CY74FCT244ATPC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244ATPC, 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 CY74FCT244ATPC part is unused and in its original packaging.
Return procedure for CY74FCT244ATPC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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