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Texas Instruments CD74FCT244M96
- Part No.:
- CD74FCT244M96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74FCT244M96.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:683
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Product details
Overview
CD74FCT244M96 from Texas Instruments is a BiCMOS octal noninverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in 5-V TTL-compatible systems. It features dual 4-bit sections with independent active-low OE controls, 64-mA sink capability per output, 3.7-V limited high-level output swing, and SCR latch-up resistance. Used in backplane drivers, memory address buffers, and microprocessor bus isolation.
For engineers reviewing the CD74FCT244M96 datasheet, CD74FCT244M96 pinout, CD74FCT244M96 application, or CD74FCT244M96 equivalent, key selection criteria include 3-state timing (tdis = 5 ns max), low-noise edge control, VCC bounce suppression, and SOIC-20 package compatibility with industrial temperature range (0°C to 70°C).
Technical Context
This device implements a BiCMOS architecture combining bipolar pull-down and CMOS pull-up transistors to limit VOH to ~3.7 V at VCC = 5 V, reducing EMI from power-bus ringing and ground bounce during simultaneous switching. Input/Output isolation from VCC enhances noise immunity.
Each of the two 4-bit sections operates independently: when OE is low, A→Y data passes transparently; when OE is high, outputs enter high-impedance state. Controlled output edge rates and buffered inputs ensure clean signal integrity in high-speed digital buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - Ensures stable operation within standard 5-V TTL supply tolerance. |
| IOL per Output | 64 mA - Supports direct drive of heavy capacitive loads or multiple TTL inputs without external buffering. |
| VOH Limit | 3.7 V max - Reduces ΔV on VCC rail during switching, minimizing EMI and supply noise coupling. |
| tpd (A→Y) | 1.5–6.5 ns - Enables use in sub-10-ns bus cycles for legacy microprocessor and memory interfaces. |
| tdis (OE→Y) | 1.5–7 ns - Guarantees fast disable timing critical for bus arbitration and shared-resource contention. |
| Input Clamping | VIK = –1.2 V - Protects against negative transient spikes without external diodes. |
| Power Dissipation | Cpd = 35 pF - Low dynamic capacitance reduces switching power in high-frequency enable/disable cycling. |
Pinout & Package
CD74FCT244M96 uses a 20-pin SOIC (DW) package with 7.5-mm body width, 2.65-mm max height, and 1.27-mm lead pitch. Pin 1 identifier located at top-left corner (Q1 quadrant in tape).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit section; tie to VCC via pullup for safe power-up high-Z state. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Buffered TTL-compatible inputs accepting 0.8 V/2 V thresholds; no floating inputs allowed. |
| 1Y1–1Y4, 2Y1–2Y4 | Noninverting 3-state outputs | BiCMOS outputs with 64-mA sink, 3.7-V VOH limit, and fast edge control for EMI reduction. |
| VCC (Pin 20) | Supply voltage | 5-V nominal; decoupling required near pin due to high di/dt during simultaneous switching. |
| GND (Pin 10) | Ground reference | Common return for all I/O and supply currents; layout must minimize inductance to suppress ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS Output Stage | Combines bipolar sink + CMOS source to limit VOH to 3.7 V, cutting VCC bounce by >30% vs. standard TTL. |
| SCR Latch-Up Resistance | Qualified per JEDEC JESD78; withstands >200 mA IIOK without latch-up in noisy industrial environments. |
| Controlled Edge Rates | Internal slew-rate limiting reduces harmonic content above 100 MHz, easing EMC compliance. |
| Input/Output Isolation | VCC-independent input structure prevents feedthrough during supply sequencing or brownout conditions. |
| Low Quiescent Power | ICC = 8 µA typical at standby - enables use in always-on bus monitor circuits without thermal penalty. |
Applications
| Backplane Bus Driver | Microprocessor Address Buffer |
|---|---|
Use Scenario: Driving parallel address/data lines across a 12-inch PCB backplane with 50-pF trace capacitance. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from peripheral slots; enabled only during valid memory cycles. Use Value: 64-mA sink current drives full trace capacitance while 3.7-V VOH limit suppresses simultaneous switching noise that would corrupt adjacent control lines. | Use Scenario: Buffering 16-bit address outputs from an 80C188EB microcontroller to external SRAM and peripherals. IC Role / Device Role / Timing Role: Dual-section octal buffer providing separate enable control for upper/lower address bytes during segmented memory access. Use Value: 1.5–6.5 ns propagation delay ensures setup/hold timing margins are maintained at 12-MHz bus clock with 3-ns skew budget. |
| Memory I/O Isolation | Legacy System Bus Arbiter |
Use Scenario: Isolating DRAM data bus from ISA expansion slot signals in an industrial PC motherboard. IC Role / Device Role / Timing Role: Bidirectional bus buffer controlled by DMA acknowledge and memory read/write strobes. Use Value: Independent OE pins allow precise timing of bus release (tdis = 1.5–7 ns), preventing data contention during DMA handoff. | Use Scenario: Arbitrating shared control bus between two legacy microcontrollers in a redundant PLC module. IC Role / Device Role / Timing Role: 3-state buffer enabling/disabling one controller's control outputs based on watchdog status and priority logic. Use Value: Input clamping (VIK = –1.2 V) and latch-up resistance protect against cross-coupled noise in electrically noisy PLC cabinets. |
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 |
|---|---|---|---|
| SN74F244N | Bipolar TTL process; 15-mA IOL, no VOH limiting, higher ICC (60 mA typ), no latch-up resistance. | Limited to lower-speed (<8 MHz), low-noise environments; unsuitable for dense PCBs with shared VCC/GND. | Select when cost is primary and EMI/robustness requirements are minimal. |
| 74ACT244SCX | Advanced CMOS; 24-mA IOL, full-rail VOH (VCC), 3.5-pF Ci, faster tpd (3.5 ns typ), but no BiCMOS EMI suppression. | Better for low-capacitance point-to-point links; lacks VCC bounce mitigation needed in multi-drop buses. | Select for high-speed point-to-point interconnect where supply noise is locally managed. |
Compared with SN74F244N and 74ACT244SCX, CD74FCT244M96 uniquely balances 64-mA drive strength, 3.7-V VOH clamping for EMI reduction, and latch-up immunity-making it the only choice for industrial backplanes and shared-bus systems operating at 5 V with marginal power integrity.
Availability
CD74FCT244M96 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor bus interfaces, and memory subsystem isolation requiring stable component supply across extended production lifecycles.
Supply support for CD74FCT244M96 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
CD74FCT244M96 belongs to TI's 74FCT logic family, engineered specifically for 5-V TTL-compatible systems demanding low-noise bus driving, robust ESD/latch-up performance, and compatibility with legacy microprocessor architectures.
FAQ
What is the maximum output sink current specification for CD74FCT244M96?
The CD74FCT244M96 supports 64 mA of output sink current per pin under recommended operating conditions (VCC = 4.75 V, TA = 25°C). This rating allows direct interfacing with multiple TTL loads or moderate PCB trace capacitance without external drivers. The absolute maximum rating extends to 70 mA, but sustained operation above 64 mA requires thermal derating per θJA = 58°C/W for the SOIC package.
Does CD74FCT244M96 require external pull-up resistors on its OE pins?
Yes - to ensure outputs remain in high-impedance state during power-up or power-down, OE pins must be tied to VCC through a pull-up resistor. TI specifies minimum resistance based on driver sink capability; for CD74FCT244M96, a 4.7-kΩ resistor is commonly used. Floating OE pins risk undefined output states and potential bus contention.
How does the 3.7-V VOH limit in CD74FCT244M96 reduce electromagnetic interference?
The CD74FCT244M96 limits VOH to approximately two diode drops below VCC (≈3.7 V at 5 V supply), which directly reduces dI/dt-induced VCC rail collapse and ground bounce during simultaneous output switching. This lowers high-frequency harmonic energy radiated from power planes, easing compliance with FCC Class A/B emissions limits - especially critical in densely routed industrial backplanes where CD74FCT244M96 is commonly deployed.
Is CD74FCT244M96 pin-compatible with CD74FCT244ATM96?
No - CD74FCT244M96 and CD74FCT244ATM96 share identical SOIC-20 packaging and pinout, but differ in AC timing: CD74FCT244ATM96 has faster propagation (tpd = 1.5–5.3 ns) and enable/disable times (ten/tdis = 1.5–6.5 ns) versus CD74FCT244M96 (tpd = 1.5–6.5 ns, ten/tdis = 1.5–8 ns). They are functionally compatible but not drop-in replacements in timing-critical paths.
What is the thermal resistance (θJA) of the CD74FCT244M96 SOIC package?
The CD74FCT244M96 in SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 58°C/W, measured per JESD 51-7 on a standard 4-layer JEDEC test board. This value assumes proper PCB copper pour and thermal vias under the exposed pad area (if present); actual system θJA may vary ±15% depending on board layout and airflow.
CD74FCT244M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 15mA, 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
CD74FCT244M96 FAQ
1.How can I place an order for CD74FCT244M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74FCT244M96 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 CD74FCT244M96 reliable?
The price and inventory of CD74FCT244M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74FCT244M96 is usually 5 days.
3.What payment methods are accepted for CD74FCT244M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74FCT244M96 transactions.
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4.How is shipping managed for CD74FCT244M96?
CD74FCT244M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74FCT244M96 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 CD74FCT244M96?
For technical support, including CD74FCT244M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74FCT244M96 requirements.
6.How does Aetrix verify that CD74FCT244M96 is sourced from the original manufacturer or authorized distributors?
All CD74FCT244M96 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 CD74FCT244M96 meets industry standards.
7.What is the process for return or replacement of CD74FCT244M96?
All CD74FCT244M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74FCT244M96, 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 CD74FCT244M96 part is unused and in its original packaging.
Return procedure for CD74FCT244M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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