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Texas Instruments CY74FCT244DTSOC
- Part No.:
- CY74FCT244DTSOC
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CY74FCT244DTSOC.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:970
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Product details
Overview
CY74FCT244DTSOC from Texas Instruments is an octal 3-state buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications in TTL- and CMOS-compatible systems. It features 64-mA sink / 32-mA source output drive, 3.6-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and edge-rate control for noise reduction.
For engineers reviewing the CY74FCT244DTSOC datasheet, CY74FCT244DTSOC pinout, CY74FCT244DTSOC application, or CY74FCT244DTSOC equivalent, key selection criteria include SOIC-20 package compatibility, 4.75–5.25 V supply operation, 3-state enable timing (tPZH/tPLZ ≤ 4.8 ns), and industrial temperature range (–40°C to +85°C) suitability.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state outputs controlled by OEA and OEB inputs. Each buffer pair (e.g., DA0→OA0, DB0→OB0) operates with matched rise/fall times and TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V).
The Ioff circuitry actively disables outputs when VCC = 0 V, limiting backflow current to ±1 µA, and edge-rate control reduces simultaneous switching noise without external components. It is functionally and pinout-compatible with standard FCT logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation across industrial-grade voltage tolerance |
| Propagation Delay | 3.6 ns max (tPLH/tPHL) - enables high-speed bus buffering up to ~270 MHz clock domains |
| Output Drive | 64 mA sink / 32 mA source - drives heavy capacitive loads and multiple TTL inputs directly |
| Ioff Current | ±1 µA at VCC = 0 V - prevents damaging back-current during hot-insertion or partial power-down |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets JEDEC JESD22-A114/A115/C101 for robust board-level handling |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded and automotive under-hood auxiliary systems |
| Package | SOIC-20 (DW) - surface-mount, 12.83 mm × 5.08 mm footprint, RoHS-compliant NIPDAU finish |
Pinout & Package
CY74FCT244DTSOC uses a 20-pin SOIC (DW) package with 1.27-mm pitch, 2.65-mm max height, and JEDEC MS-013 compliant outline. Pin 1 is located at top-left corner with beveled edge marking.
| 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 (DA0) | Data Input A0 | Noninverting input for OA0 output; TTL/CMOS compatible (VIH = 2 V, VIL = 0.8 V) |
| 3 (OA0) | Output A0 | 3-state noninverting output driven by DA0; 64-mA sink capability supports fanout ≥10 |
| 4 (DA1) | Data Input A1 | Noninverting input for OA1; electrically identical to DA0 |
| 5 (OA1) | Output A1 | 3-state output matching OA0 timing and drive strength |
| 6 (DA2) | Data Input A2 | Input for third buffer in A group |
| 7 (OA2) | Output A2 | Matched-output buffer with same VOH/VOL specs as OA0 |
| 8 (DA3) | Data Input A3 | Final input of A-group buffer set |
| 9 (OA3) | Output A3 | 3-state output with tPLH/tPHL ≤ 3.6 ns and VOL ≤ 0.55 V at 64 mA |
| 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 near pin required for noise immunity |
| 12 (OEB) | Output Enable B | Active-low enable for second 4-channel group (OB0–OB3); independent of OEA |
| 13 (OA0) | Data Input B0 | Input for OB0; electrically isolated from DA0 but identical interface specs |
| 14 (OB0) | Output B0 | 3-state output with same drive and timing as OA0; supports separate bus segments |
| 15 (OA1) | Data Input B1 | Input for OB1; shares no internal path with DA1 |
| 16 (OB1) | Output B1 | Independent buffered output with matched VOL/VOH performance |
| 17 (OA2) | Data Input B2 | Third input of B group |
| 18 (OB2) | Output B2 | Guaranteed tPZH ≤ 4.8 ns for fast enable/disable transitions |
| 19 (OA3) | Data Input B3 | Final B-group input |
| 20 (OB3) | Output B3 | Full-drive 3-state output completing the octal buffer set |
Key Features
| Feature | Design Value |
|---|---|
| Edge-Rate Control | Reduces simultaneous switching noise (SSN) without external series resistors or layout tuning |
| Ioff Partial-Power-Down | Enables safe insertion into live backplanes or hot-swap subsystems with zero backfeed current |
| Matched Rise/Fall Times | Minimizes duty-cycle distortion on clock or data lines driving transmission lines |
| TTL-Compatible Interface | Direct connection to legacy 5-V TTL logic without level shifters or pull-ups |
| 3-State Output Isolation | Prevents bus contention in multi-driver systems via independent OEA/OEB controls |
Applications
| Memory Address Buffering | Clock Distribution Network |
|---|---|
Use Scenario: Driving address lines from microcontroller to multiple SRAM or EPROM devices on shared bus. IC Role / Device Role / Timing Role: Noninverting octal buffer isolating MCU address outputs while boosting drive strength and noise immunity. Use Value: Enables reliable 8-bit address fanout to ≥10 TTL loads with <3.6 ns skew between bits and no added propagation delay jitter. | Use Scenario: Distributing a system clock signal to multiple synchronous peripherals (e.g., ADC, DAC, FPGA config logic). IC Role / Device Role / Timing Role: Low-skew, high-drive clock buffer with matched edge rates to minimize inter-channel skew and EMI. Use Value: Maintains <0.5 ns channel-to-channel skew and supports 64-mA load per output for clean clock edges across PCB traces. |
| Industrial Bus Transceiver | Legacy System Interface Adapter |
Use Scenario: Bidirectional data transfer between microcontroller and fieldbus nodes (e.g., Modbus RTU over RS-485 PHY). IC Role / Device Role / Timing Role: Direction-controlled 3-state line driver/receiver enabling half-duplex bus arbitration. Use Value: Independent OEA/OEB allows precise timing control of driver enable/disable, reducing bus turnaround time to <4.8 ns. | Use Scenario: Interfacing modern 3.3-V microcontrollers with legacy 5-V peripheral modules (e.g., ISA-bus expansion cards). IC Role / Device Role / Timing Role: Level-tolerant buffer translating logic levels while preserving timing integrity and drive strength. Use Value: Accepts 3.3-V or 5-V inputs and delivers full 5-V TTL-compatible outputs without external biasing or clamping diodes. |
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 |
|---|---|---|---|
| SN74FCT244DWR | Same SOIC-20 package, identical pinout, 3.6-ns propagation delay, but rated for 0°C to 70°C only | Limited to commercial temperature range; unsuitable for industrial environments requiring –40°C operation | Select CY74FCT244DTSOC when extended temperature range and Ioff protection are mandatory |
| 74ACT244SCX | Higher VOH (≥4.4 V), lower ICC, but no Ioff support and 5.5-V absolute max VCC vs. 7 V for CY74FCT244DTSOC | Lacks partial-power-down capability; not suitable for hot-swap or mixed-voltage domain isolation | Choose CY74FCT244DTSOC where system-level power sequencing or backfeed prevention is required |
Compared with SN74FCT244DWR and 74ACT244SCX, CY74FCT244DTSOC uniquely combines industrial temperature rating, Ioff-enabled hot-swap safety, and edge-rate controlled noise performance in a single SOIC-20 package.
Availability
CY74FCT244DTSOC is available at Aetrix Electronics and suitable for industrial automation controllers, legacy bus interface modules, and embedded clock distribution networks requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CY74FCT244DTSOC 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 over 50 years of innovation in high-reliability interface and buffer ICs.
The CY74FCT244DTSOC belongs to TI's FCT logic family, engineered for noise-immune, high-drive 5-V digital interfacing in industrial, telecom, and computing infrastructure where signal integrity and power-down safety are critical.
FAQ
What is the maximum operating temperature range for CY74FCT244DTSOC?
CY74FCT244DTSOC is specified for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's production test flow and supports deployment in programmable logic controllers, motor drives, and outdoor communications equipment where thermal cycling is expected. The SOIC-20 package exhibits 58°C/W θJA, enabling reliable thermal dissipation under full-load conditions.
Does CY74FCT244DTSOC support partial-power-down mode?
Yes, CY74FCT244DTSOC integrates Ioff circuitry that disables all outputs when VCC = 0 V, limiting backflow current to ±1 µA. This feature is explicitly verified in the datasheet's electrical characteristics table and enables safe use in hot-plug systems, modular backplanes, and multi-rail power architectures where individual sections may be powered down independently while others remain active.
What is the propagation delay specification for CY74FCT244DTSOC?
CY74FCT244DTSOC has a maximum propagation delay of 3.6 ns (tPLH and tPHL) under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to +85°C). This value is measured from input transition (50% point) to output transition (50% point) with CL = 50 pF, and guarantees deterministic timing for high-speed address or data bus buffering in real-time control systems.
Can CY74FCT244DTSOC drive TTL loads directly?
Yes, CY74FCT244DTSOC is fully compatible with TTL input and output logic levels. Its VOH (min 2.4 V at –32 mA) and VOL (max 0.55 V at 64 mA) meet or exceed standard TTL specifications, and its VIH (2 V) and VIL (0.8 V) thresholds ensure reliable recognition of TTL outputs. No external level-shifting components are needed when interfacing with legacy 74LS or 74ALS devices.
Is CY74FCT244DTSOC pin-compatible with other FCT-family octal buffers?
Yes, CY74FCT244DTSOC is functionally and pinout-compatible with CY74FCT244T, CY74FCT244AT, and CY74FCT244CT variants in the same SOIC-20 package. All share identical pin assignments, logic diagram, and DC/AC specifications except for propagation delay grading (3.6 ns for 'D', 4.1 ns for 'C', 4.6 ns for 'A'). This allows drop-in replacement within the same speed grade and package footprint.
CY74FCT244DTSOC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CY74FCT244DTSOC FAQ
1.How can I place an order for CY74FCT244DTSOC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244DTSOC 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 CY74FCT244DTSOC reliable?
The price and inventory of CY74FCT244DTSOC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244DTSOC is usually 5 days.
3.What payment methods are accepted for CY74FCT244DTSOC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244DTSOC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244DTSOC?
CY74FCT244DTSOC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244DTSOC 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 CY74FCT244DTSOC?
For technical support, including CY74FCT244DTSOC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244DTSOC requirements.
6.How does Aetrix verify that CY74FCT244DTSOC is sourced from the original manufacturer or authorized distributors?
All CY74FCT244DTSOC 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 CY74FCT244DTSOC meets industry standards.
7.What is the process for return or replacement of CY74FCT244DTSOC?
All CY74FCT244DTSOC units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244DTSOC, 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 CY74FCT244DTSOC part is unused and in its original packaging.
Return procedure for CY74FCT244DTSOC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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