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Texas Instruments CD74AC244SM96
- Part No.:
- CD74AC244SM96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CD74AC244SM96.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,096
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Product details
Overview
CD74AC244SM96 from Texas Instruments is a 20-pin SOIC-packaged octal buffer/line driver with dual active-low 3-state outputs, 1.5V–5.5V supply operation, ±24mA output drive, and balanced propagation delays (max 11.5ns at 5V). It serves as a bidirectional bus interface or address/data line driver in industrial control backplanes and microcontroller I/O expansion systems.
For engineers reviewing the CD74AC244SM96 datasheet, CD74AC244SM96 pinout, CD74AC244SM96 application, or CD74AC244SM96 equivalent, this page delivers verified electrical specs, thermal data, truth table behavior, package dimensions, and real-world implementation guidance for reliable signal integrity in noise-sensitive digital systems.
Technical Context
The CD74AC244SM96 implements two independent 4-bit banks (Bank 1: pins 2,4,6,8 → 12,14,16,18; Bank 2: pins 11,13,15,17 → 3,5,7,9), each controlled by its own active-low output enable (1OE on pin 1, 2OE on pin 19). Its RCA Advanced CMOS process ensures SCR latch-up resistance and operation across −40°C to +85°C.
It features balanced AC-series switching characteristics: tPLH/tPHL ≤ 11.5ns (VCC = 5V, CL = 50pF), tPZL/tPHZ ≤ 18ns, and 3-state output capacitance of 15pF. Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), supporting mixed-voltage interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 5.5V - enables direct interface with 1.8V, 2.5V, 3.3V, and 5V logic families without level shifters. |
| Output Drive Current | ±24mA per output - sufficient to fan out to 15 FAST ICs or directly drive 50Ω transmission lines. |
| Propagation Delay | ≤11.5ns at 5V - supports high-speed bus buffering up to ~50MHz clock domains with tight timing margins. |
| 3-State Leakage | ±10μA max at −55°C to +125°C - ensures low standby current and stable high-impedance state during power sequencing. |
| Input Capacitance | 10pF - minimizes capacitive loading on upstream drivers, preserving signal rise/fall times in dense PCB layouts. |
| Quiescent Supply Current | 160μA max over full temperature range - enables low-power operation in battery-backed or energy-constrained systems. |
| ESD Rating | Class H2 (≥2kV HBM) - meets industrial handling requirements without requiring special ESD precautions beyond standard CMOS practices. |
Pinout & Package
CD74AC244SM96 uses a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (including pins), with body size 12.8mm × 7.5mm. Pin 10 is GND; pin 20 is VCC. Thermal pad is not present in DW package (only RKS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1OE) | Active-low output enable for Bank 1 | Drives all four Bank 1 outputs (1Y0–1Y3) into high-impedance when HIGH; enables them when LOW. |
| 2,4,6,8 (1A0–1A3) | Inputs for Bank 1 | Accept TTL/CMOS-compatible signals; VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC ensures robust noise immunity. |
| 12,14,16,18 (1Y0–1Y3) | Outputs for Bank 1 | Drive bidirectional buses or peripheral address/data lines with ±24mA sink/source capability. |
| 11,13,15,17 (2A0–2A3) | Inputs for Bank 2 | Independent input set; electrically isolated from Bank 1 except via shared VCC/GND rails. |
| 3,5,7,9 (2Y0–2Y3) | Outputs for Bank 2 | Match Bank 1 timing and drive strength; used for parallel bus segments or mirrored signal paths. |
| 19 (2OE) | Active-low output enable for Bank 2 | Enables/disables Bank 2 independently - allows time-multiplexed or selective bus access control. |
| 10 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Positive supply | Single rail powers both banks; requires local 0.1μF ceramic bypass capacitor placed within 5mm. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latch-up-resistant CMOS process | Guarantees immunity to destructive latch-up under transient overvoltage or hot-swap conditions in industrial environments. |
| Balanced propagation delays (tPLH ≈ tPHL) | Reduces duty-cycle distortion in clocked bus applications and simplifies timing closure for synchronous designs. |
| 1.5V–5.5V wide supply range | Eliminates need for external voltage translators when interfacing legacy 5V peripherals with modern 1.8V/2.5V controllers. |
| ±24mA output drive into 50Ω loads | Supports point-to-point or short stub transmission-line routing without external termination resistors. |
| Low 3-state leakage (±10μA max) | Prevents unintended current flow during power-down or sleep modes, critical for system-level power budgeting. |
| 10pF input capacitance | Minimizes loading on preceding gate outputs, preserving edge rates and reducing inter-symbol interference. |
Applications
| Industrial PLC Backplane Interface | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating and driving address/data buses between CPU module and modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional buffer with independent bank enables (1OE/2OE) manages read/write direction and card-select arbitration. Use Value: ±24mA drive sustains signal integrity across 15cm backplane traces; 11.5ns delay enables 50MHz bus cycles. |
Use Scenario: Extending GPIO count of ARM Cortex-M or RISC-V microcontrollers for sensor arrays and actuator control. IC Role / Device Role / Timing Role: Level-shifting octal buffer translates 3.3V MCU outputs to 5V peripheral inputs while providing drive strength. Use Value: 1.5V–5.5V supply range eliminates external level shifters; 10pF input capacitance avoids slowing MCU output edges. |
| Test Equipment Signal Routing | Automated Test Fixture Control |
Use Scenario: Multiplexing digital stimulus signals from ATE sources to DUT pins in semiconductor test handlers. IC Role / Device Role / Timing Role: 3-state driver selects active signal path; fast enable/disable (18ns) supports rapid test sequence switching. Use Value: Low 3-state leakage (±10μA) prevents crosstalk between inactive channels; balanced delays ensure skew < 1ns. |
Use Scenario: Driving relay coils, solenoid valves, and LED indicators in production test fixtures with microcontroller supervision. IC Role / Device Role / Timing Role: High-current buffer isolates MCU GPIOs from inductive loads and provides current gain. Use Value: ±24mA sink/source handles typical 20mA indicator LEDs or 10mA relay coils without external transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC244N | Same AC logic family, identical pinout and specs, but in PDIP-20 (N package); RθJA = 40°C/W vs. 101.2°C/W for SOIC. | Preferred for prototyping or through-hole assembly; higher thermal performance but larger footprint. | Select SN74AC244N when manual soldering, breadboarding, or thermal dissipation >150mW is required. |
| CD74ACT244M96 | ACT variant: TTL-compatible inputs (VIH = 2.0V min), faster propagation (≤9.6ns), but narrower 4.5V–5.5V supply range. | Suitable only for 5V-only systems; incompatible with 3.3V or lower logic without level translation. | Choose CD74ACT244M96 only when interfacing exclusively with legacy 5V TTL peripherals and speed >50MHz is mandatory. |
Compared with SN74AC244N and CD74ACT244M96, CD74AC244SM96 uniquely balances wide-voltage operation (1.5–5.5V), SOIC space efficiency, and industrial temperature support (−40°C to +85°C), making it optimal for modern mixed-voltage embedded systems where layout density and supply flexibility are critical.
Availability
CD74AC244SM96 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and microcontroller-based embedded systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for CD74AC244SM96 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 connectivity technologies, with decades of experience in high-reliability logic and interface solutions.
CD74AC244SM96 belongs to TI's legacy CD74AC high-speed CMOS logic family, designed specifically for robust, low-power bus interfacing in industrial, automotive, and instrumentation applications where wide supply range and latch-up immunity are essential.
FAQ
What is the maximum operating temperature range for CD74AC244SM96?
The CD74AC244SM96 is rated for operation from −40°C to +85°C, matching the commercial/industrial temperature grade specified for the CD74AC series. This range is validated per TI's recommended operating conditions and supported by thermal derating data in the datasheet's RθJA specification (101.2°C/W for SOIC).
Does CD74AC244SM96 support 3.3V logic levels?
Yes, CD74AC244SM96 fully supports 3.3V operation: its VIH minimum is 2.1V (0.7×3.3V) and VIL maximum is 0.99V (0.3×3.3V) at TA = +25°C, with guaranteed noise margins across the full −40°C to +85°C range. It interfaces directly with 3.3V microcontrollers and FPGAs without level shifting.
Can CD74AC244SM96 drive a 50Ω transmission line?
Yes, CD74AC244SM96 is explicitly characterized to drive 50Ω transmission lines, with ±24mA output current ensuring clean signal edges. The datasheet confirms this capability at +85°C (50Ω) and +125°C (75Ω), making it suitable for short-run PCB traces or cable-driven signals in test and control systems.
What is the function of pins 1 and 19 on CD74AC244SM96?
Pins 1 (1OE) and 19 (2OE) are active-low output enable controls for Bank 1 and Bank 2 respectively. When pulled LOW, they enable the corresponding four outputs (1Y0–1Y3 or 2Y0–2Y3); when HIGH, those outputs enter high-impedance state. This allows independent bus segment control or time-multiplexed data routing.
Is CD74AC244SM96 pin-compatible with CD74ACT244M96?
Yes, CD74AC244SM96 and CD74ACT244M96 share identical SOIC-20 (DW) pinout, package dimensions, and terminal functions. However, their input thresholds differ: CD74AC244SM96 accepts 1.5V–5.5V supplies with CMOS-compatible inputs, while CD74ACT244M96 requires 4.5V–5.5V and has TTL-compatible inputs (VIH = 2.0V min).
CD74AC244SM96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CD74AC244SM96 FAQ
1.How can I place an order for CD74AC244SM96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC244SM96 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 CD74AC244SM96 reliable?
The price and inventory of CD74AC244SM96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC244SM96 is usually 5 days.
3.What payment methods are accepted for CD74AC244SM96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC244SM96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC244SM96?
CD74AC244SM96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC244SM96 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 CD74AC244SM96?
For technical support, including CD74AC244SM96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC244SM96 requirements.
6.How does Aetrix verify that CD74AC244SM96 is sourced from the original manufacturer or authorized distributors?
All CD74AC244SM96 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 CD74AC244SM96 meets industry standards.
7.What is the process for return or replacement of CD74AC244SM96?
All CD74AC244SM96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC244SM96, 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 CD74AC244SM96 part is unused and in its original packaging.
Return procedure for CD74AC244SM96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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