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Texas Instruments CY74FCT244ATQCT
- Part No.:
- CY74FCT244ATQCT
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
CY74FCT244ATQCT.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:811
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Product details
Overview
CY74FCT244ATQCT from Texas Instruments is an octal 3-state noninverting buffer/line driver designed for memory address, clock, and bus-oriented signal transmission in industrial and embedded systems. It delivers 64-mA sink / 32-mA source drive strength, 4.6-ns max propagation delay (tPLH/tPHL), and operates across –40°C to +85°C with 4.75–5.25-V supply. Its Ioff circuitry enables partial-power-down mode, supporting hot-swap and system-level power sequencing.
For engineers reviewing the CY74FCT244ATQCT datasheet, CY74FCT244ATQCT pinout, CY74FCT244ATQCT application, or CY74FCT244ATQCT equivalent, key selection criteria include 3-state bus isolation capability, TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), edge-rate controlled outputs for noise reduction, and SSOP-20 (DBQ) package compatibility with high-density PCB layouts.
Technical Context
This device implements dual 4-bit noninverting buffers with independent 3-state control (OEA/OEB), enabling bidirectional bus driving or unidirectional signal fanout. Each output features matched rise/fall times and edge-rate control circuitry to suppress simultaneous switching noise (SSN).
It supports full TTL-level interfacing without level shifters-inputs accept 0.8 V low / 2.0 V high thresholds, outputs deliver VOH ≥ 2.4 V (min) at –32 mA and VOL ≤ 0.55 V (max) at 64 mA-while Ioff limits current flow during power-down states to ±1 µA per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - Ensures stable operation under industrial rail tolerances; avoids undervoltage lockout or overvoltage stress. |
| Propagation Delay | ≤4.6 ns (max) - Enables reliable timing in 100+ MHz address/data buses with margin for trace skew and loading. |
| Output Drive | 64 mA sink / 32 mA source - Drives heavy capacitive loads (e.g., >50 pF) and multiple TTL inputs without external buffers. |
| Ioff Current | ±1 µA at VCC = 0 V - Prevents backflow damage during partial power-down, critical for hot-plug and mixed-voltage domain designs. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade robustness requirements without added protection circuitry. |
| Operating Temperature | –40°C to +85°C - Qualified for extended-temperature industrial control, instrumentation, and automotive under-hood ancillary logic. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Fully compatible with legacy TTL, LVTTL, and 5-V CMOS logic families without level translation. |
Pinout & Package
Package: SSOP-20 (DBQ), 0.65-mm pitch, 7.2-mm width, 2.65-mm max height - optimized for automated assembly and space-constrained industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEA) | Output Enable A | Active-low enable for first 4-channel buffer group (OA0–OA3); ties to GND for always-on operation or microcontroller GPIO for dynamic control. |
| 2–5 (DA0–DA3) | Data Inputs A | Noninverting inputs for OA0–OA3 outputs; accept TTL/CMOS logic levels directly with no external biasing. |
| 6–9 (OA0–OA3) | Outputs A | 3-state buffered outputs driven by DA0–DA3; high-impedance when OEA = HIGH, reducing bus contention. |
| 10 (GND) | Ground | Primary reference for all I/O and internal logic; requires low-inductance connection to minimize ground bounce. |
| 11 (VCC) | Power Supply | +5-V supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin for noise suppression. |
| 12 (OEB) | Output Enable B | Active-low enable for second 4-channel buffer group (OB0–OB3); allows independent control of two bus segments. |
| 13–16 (DB0–DB3) | Data Inputs B | Noninverting inputs for OB0–OB3 outputs; electrically isolated from DA0–DA3 but share same VCC/GND domains. |
| 17–20 (OB0–OB3) | Outputs B | 3-state buffered outputs driven by DB0–DB3; matched timing with OAx group ensures synchronous bus transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-rate controlled outputs | Reduces simultaneous switching noise (SSN) by limiting dV/dt, enabling cleaner signal integrity on shared PCB traces and stubbed buses. |
| Matched rise/fall times | Minimizes duty cycle distortion in clock distribution paths, preserving timing margins in synchronous systems. |
| Ioff partial-power-down support | Prevents damaging current flow between powered and unpowered sections in modular systems or hot-swap backplanes. |
| TTL-compatible voltage thresholds | Eliminates need for external level-shifting components when interfacing with legacy 5-V logic families. |
| 3-state dual-enable architecture | Enables flexible bus arbitration: one group can drive while the other is tri-stated, supporting half-duplex or multiplexed data routing. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or flash devices on a shared bus. IC Role / Device Role: Noninverting octal buffer with independent 3-state control per 4-bit group, isolating memory banks during access cycles. Use Value: Eliminates address line contention and reduces propagation delay vs discrete transistor arrays, improving maximum system clock rate. |
Use Scenario: Interfacing a PLC CPU module to field I/O expansion racks via parallel control bus. IC Role / Device Role: Bidirectional line driver/receiver with Ioff-enabled hot-swap capability during rack insertion/removal. Use Value: Prevents backfeed into powered modules and maintains signal integrity across long ribbon cables with distributed capacitance. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
Use Scenario: Fanout of a 25-MHz system clock to multiple ASICs and FPGAs in test instrumentation hardware. IC Role / Device Role: Low-skew, edge-rate-controlled buffer delivering matched rise/fall times to minimize clock jitter. Use Value: Maintains <100-ps inter-channel skew across all 8 outputs, preserving setup/hold timing for high-speed digital capture. |
Use Scenario: Level-shifting and drive strengthening of DUT control signals (e.g., reset, enable) in automated test fixtures. IC Role / Device Role: TTL-compatible input interface with 64-mA sink capability to drive LEDs, relays, or optocouplers directly. Use Value: Removes need for discrete driver transistors, reducing BOM count and board area while ensuring robust signal assertion. |
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 logic function and electrical specs, but in TSSOP-20 (PW) package with 0.65-mm pitch and 4.4-mm width - 28% narrower footprint than SSOP-20. | Preferred where board space is constrained and thermal dissipation is moderate; not suitable for high-vibration environments due to smaller lead form factor. | Select SN74FCT244ATPWR if layout density is prioritized and reflow profile supports TSSOP; verify MSL-1 handling for long-term storage. |
| 74ACT244SCX | Higher drive (24 mA source / 24 mA sink), slower speed (7.5 ns max tPLH), and wider operating range (–40°C to +85°C) - ACT-family silicon with different noise characteristics. | Better suited for low-noise analog-adjacent digital subsystems where lower output current suffices and edge-rate control is less critical. | Choose 74ACT244SCX only when reduced EMI is secondary to ultra-low static current (ICC < 4 µA) and compatibility with older ACT-based designs is required. |
Compared with SN74FCT244ATPWR and 74ACT244SCX, CY74FCT244ATQCT provides superior drive strength and faster propagation for high-speed bus loading, retains TI's edge-rate control for noise-sensitive applications, and offers verified SSOP-20 manufacturability in volume production.
Availability
CY74FCT244ATQCT is available at Aetrix Electronics and suitable for industrial control panels, programmable logic controller (PLC) backplanes, and legacy-system upgrade programs requiring stable component supply with long lifecycle assurance.
Supply support for CY74FCT244ATQCT 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 industrial and aerospace-grade components.
CY74FCT244ATQCT belongs to TI's FCT logic family, engineered for high-speed, low-power 5-V TTL-compatible interfacing in mission-critical industrial and communications infrastructure equipment.
FAQ
What is the maximum operating temperature range for CY74FCT244ATQCT?
CY74FCT244ATQCT is rated for continuous operation from –40°C to +85°C ambient temperature. This extended industrial temperature range ensures reliability in factory automation controllers, outdoor telecom cabinets, and motor drive interface modules where thermal cycling and elevated ambient conditions are common. The SSOP-20 package's thermal resistance (θJA = 68°C/W) supports this rating under typical PCB copper pour conditions.
Does CY74FCT244ATQCT support hot-swap or partial-power-down operation?
Yes, CY74FCT244ATQCT includes Ioff circuitry that limits current to ±1 µA per I/O terminal when VCC = 0 V. This feature enables safe hot-insertion into live backplanes and prevents damaging current backflow during staged power-up/down sequences in modular systems. The device remains electrically isolated even when inputs are driven while unpowered, meeting IEC 61000-4-2 system-level ESD resilience requirements.
Can CY74FCT244ATQCT drive standard TTL loads directly?
Yes, CY74FCT244ATQCT is fully TTL-compatible: its VIH threshold is 2.0 V (min), VIL is 0.8 V (max), VOH delivers ≥2.4 V at –32 mA, and VOL stays ≤0.55 V at 64 mA. This allows direct connection to 74LS, 74ALS, and other legacy TTL families without level shifters or pull-up resistors-reducing design complexity and component count in retrofitted systems.
What is the propagation delay specification for CY74FCT244ATQCT?
CY74FCT244ATQCT has a maximum propagation delay of 4.6 ns (tPLH/tPHL) under recommended operating conditions (VCC = 4.75–5.25 V, TA = –40°C to +85°C, CL = 50 pF). This value applies to both inverting and noninverting paths and includes worst-case process/voltage/temperature corners, providing timing margin for 100-MHz bus operation with 5-ns setup/hold windows.
Is CY74FCT244ATQCT RoHS-compliant and lead-free?
Yes, CY74FCT244ATQCT is RoHS-compliant and features NiPdAu (NIPDAU) lead finish. It meets JEDEC Level-2-260°C-1-year moisture sensitivity requirements and is supplied in tape-and-reel packaging (2500 units per reel) with Q1 pin-1 orientation. Full compliance documentation-including substance declarations and reflow profiles-is available through TI's official product page and Aetrix's quality portal.
CY74FCT244ATQCT 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
CY74FCT244ATQCT FAQ
1.How can I place an order for CY74FCT244ATQCT through Aetrix?
Please submit a Request for Quotation (RFQ) for CY74FCT244ATQCT 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 CY74FCT244ATQCT reliable?
The price and inventory of CY74FCT244ATQCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY74FCT244ATQCT is usually 5 days.
3.What payment methods are accepted for CY74FCT244ATQCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY74FCT244ATQCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY74FCT244ATQCT?
CY74FCT244ATQCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY74FCT244ATQCT 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 CY74FCT244ATQCT?
For technical support, including CY74FCT244ATQCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY74FCT244ATQCT requirements.
6.How does Aetrix verify that CY74FCT244ATQCT is sourced from the original manufacturer or authorized distributors?
All CY74FCT244ATQCT 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 CY74FCT244ATQCT meets industry standards.
7.What is the process for return or replacement of CY74FCT244ATQCT?
All CY74FCT244ATQCT units undergo pre-shipment inspection (PSI). If there is an issue with CY74FCT244ATQCT, 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 CY74FCT244ATQCT part is unused and in its original packaging.
Return procedure for CY74FCT244ATQCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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