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Texas Instruments CD74ACT244SM96
- Part No.:
- CD74ACT244SM96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
CD74ACT244SM96.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
CD74ACT244SM96 from Texas Instruments is a 3-state octal buffer/line driver in SOIC-20 package, operating at 4.5–5.5 V supply, delivering ±24 mA output drive per channel with balanced propagation delays (tPLH/tPHL ≤ 8.7 ns at 5 V), and designed for bidirectional bus interface applications in industrial control and data acquisition systems.
For engineers reviewing the CD74ACT244SM96 datasheet, CD74ACT244SM96 pinout, CD74ACT244SM96 application, or CD74ACT244SM96 equivalent, key selection criteria include its ACT-series TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), 50-Ω transmission-line drive capability, dual active-low output enables (1OE, 2OE), and −40°C to +85°C industrial temperature range.
Technical Context
The CD74ACT244SM96 implements two independent 4-bit non-inverting buffer banks, each controlled by its own active-low 3-state output enable (1OE for Bank 1, 2OE for Bank 2). Its RCA Advanced CMOS process ensures SCR-latch-up resistance and compatibility with TTL-level logic inputs while maintaining CMOS power efficiency.
It supports high-speed bus buffering with guaranteed switching characteristics across −40°C to +85°C: tPZL/tPHZ ≤ 13.4 ns (output enable/disable), CPD = 71 pF, and simultaneous switching noise immunity verified via VOHV (min 4 V) and VOLP (max 1 V) measurements at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - Ensures direct compatibility with 5-V TTL and mixed-voltage system backplanes. |
| Output Drive | ±24 mA per pin - Sufficient to fan out to 15 FAST ICs or directly drive 50-Ω PCB traces without external termination. |
| Propagation Delay | ≤8.7 ns (tPLH/tPHL at 5 V) - Enables reliable operation in 100+ MHz address/data bus environments. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic levels, eliminating level-shifting requirements. |
| 3-State Leakage | ±5 μA max (IOZ) - Minimizes signal integrity risk during bus contention or hot-swap scenarios. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded controllers and factory automation equipment. |
| Power Dissipation Cap. | 71 pF (CPD) - Used with CL to calculate dynamic power: PD = VCC² × fi × (CPD + CL). |
Pinout & Package
CD74ACT244SM96 uses a 20-pin SOIC (DW) package with 12.8 mm × 10.3 mm footprint and 12.8 mm × 7.5 mm body size. Pin 10 is GND; Pin 20 is VCC; Pins 1 and 19 are active-low output enables (1OE, 2OE); inputs (1A0–1A3, 2A0–2A3) and outputs (1Y0–1Y3, 2Y0–2Y3) are arranged in interleaved order for minimized crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-low enable for Bank 1 outputs (1Y0–1Y3); asserts 3-state when high. |
| 2–5, 12–15 | 1A0–1A3 / 1Y0–1Y3 | Bank 1 input/output pairs; non-inverting; driven only when 1OE = low. |
| 11, 13, 15, 17 | 2A0–2A3 | Bank 2 inputs; routed to corresponding Y outputs when 2OE = low. |
| 3, 5, 7, 9 | 2Y3–2Y0 | Bank 2 outputs; physically interleaved with Bank 1 pins to reduce adjacent-channel coupling. |
| 10 | GND | Ground reference for all I/O and internal logic; must be low-impedance connection. |
| 19 | 2OE | Active-low enable for Bank 2 outputs (2Y0–2Y3); independent control from Bank 1. |
| 20 | VCC | +4.5 to +5.5 V supply; requires local 0.1 µF bypass capacitor placed within 5 mm. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latch-up-resistant CMOS | Meets JEDEC JESD78 Class II (>200 mA latch-up immunity), enabling robust operation in noisy industrial environments. |
| Balanced propagation delays | tPLH and tPHL differ by ≤0.9 ns (at 5 V), minimizing skew-induced timing violations in parallel bus interfaces. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V at VCC = 5 V - eliminates need for external level shifters when interfacing with legacy TTL peripherals. |
| 50-Ω transmission-line drive | Validated at +85°C with 75-Ω capability at +125°C - supports impedance-controlled routing on high-speed backplanes without series termination. |
| Low quiescent current | ICC ≤ 80 μA over full temperature range - reduces standby power in battery-backed or energy-sensitive industrial nodes. |
Applications
| Industrial PLC Backplane Interface | Test Equipment Digital I/O Module |
|---|---|
Use Scenario: Bidirectional data transfer between microcontroller and isolated I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Octal buffer isolates MCU address/data bus from field-side transceivers; dual OE pins allow independent gating of input vs. output paths. Use Value: ±24 mA drive ensures clean signal edges across 150-mm backplane traces; 8.7 ns delay enables 100-MHz bus clocking with margin. |
Use Scenario: Signal conditioning and level translation between FPGA-based pattern generators and DUT interface connectors. IC Role / Device Role / Timing Role: Acts as programmable bus keeper and direction controller; 3-state outputs prevent contention during test vector transitions. Use Value: Low IOZ (±5 μA) avoids false triggering on floating lines; balanced tPLH/tPHL minimizes setup/hold violations in high-speed digital test vectors. |
| Automotive Body Control Unit | Medical Data Acquisition Front-End |
Use Scenario: Interfacing 8-bit microcontroller GPIO to CAN/LIN transceiver control lines and sensor multiplexers. IC Role / Device Role / Timing Role: Provides voltage-level bridging and current boosting for low-power MCU outputs driving higher-capacitance automotive harnesses. Use Value: −40°C to +85°C rating matches under-hood ECU thermal envelope; SCR immunity prevents latch-up during load-dump transients. |
Use Scenario: Isolating ADC/DAC control buses from microcontroller in portable diagnostic devices with strict EMC requirements. IC Role / Device Role / Timing Role: Buffers serial configuration commands and status reads between processor and precision analog front-end ICs. Use Value: 71 pF CPD limits dynamic power consumption below 1 mW at 10 MHz; low ICC supports battery life extension in handheld units. |
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 |
|---|---|---|---|
| SN74ACT244N | Same ACT logic family, identical electrical 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; lacks SOIC's space efficiency and thermal performance in dense layouts. | Select SN74ACT244N when manual soldering or socket-based validation is required; CD74ACT244SM96 preferred for volume SMT production. |
| 74ACT244SCX | Second-source part from ON Semiconductor; matches TI's VIH/VIL, tPLH/tPHL, and drive strength, but has higher ICC (160 μA max vs. 80 μA). | Suitable for cost-sensitive industrial designs where minor quiescent current increase is acceptable. | Choose 74ACT244SCX only after verifying layout-level thermal margins; CD74ACT244SM96 offers better power efficiency and TI's long-term supply assurance. |
Compared with SN74ACT244N and 74ACT244SCX, CD74ACT244SM96 delivers superior thermal resistance management in compact SOIC packaging, lower quiescent current for battery-critical systems, and guaranteed support for industrial temperature operation with TI's extended product lifecycle commitment.
Availability
CD74ACT244SM96 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and medical device manufacturing requiring stable component supply, long-term obsolescence planning, and RoHS-compliant sourcing.
Supply support for CD74ACT244SM96 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 over 50 years of innovation in high-reliability logic and interface solutions.
The CD74ACT244SM96 belongs to TI's legacy CD74ACT high-speed CMOS logic family, engineered specifically for robust 5-V bus interfacing in industrial, automotive, and instrumentation applications demanding TTL compatibility and latch-up immunity.
FAQ
What is the maximum operating temperature range for CD74ACT244SM96?
The CD74ACT244SM96 is rated for operation from −40°C to +85°C, meeting industrial temperature grade requirements. This range is validated across all electrical specifications including propagation delay, output drive, and leakage current, ensuring reliability in factory-floor and outdoor-mounted control systems where ambient temperatures fluctuate widely. The SOIC-20 package (DW) supports this range with RθJA = 101.2°C/W.
Does CD74ACT244SM96 support 3.3-V logic inputs?
No, CD74ACT244SM96 does not reliably accept 3.3-V logic inputs. Its ACT-series input thresholds require VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V; a 3.3-V high signal falls below the guaranteed VIH margin and may result in undefined switching behavior. For mixed-voltage systems, use a dedicated level translator or select an AC-series variant like CD74AC244M96 (1.5–5.5 V operation).
How many output enable pins does CD74ACT244SM96 have, and what is their logic polarity?
CD74ACT244SM96 has two active-low output enable pins: Pin 1 (1OE) controls Bank 1 outputs (1Y0–1Y3), and Pin 19 (2OE) controls Bank 2 outputs (2Y0–2Y3). When either OE pin is high, its respective bank enters high-impedance (3-state) mode; both must be low for normal non-inverting buffer operation. This dual-OE architecture enables independent direction control in half-duplex bus applications.
Can CD74ACT244SM96 drive 50-Ω transmission lines directly?
Yes, CD74ACT244SM96 is explicitly characterized to drive 50-Ω transmission lines at +85°C, with verification up to 75 Ω at +125°C. Its ±24 mA output drive capability ensures adequate signal swing and edge rate (tr/tl ≤ 3 ns) without external series termination resistors, simplifying PCB layout for high-speed backplane and cable interface designs.
What is the pin-compatible replacement for CD74ACT244SM96 if SOIC-20 is unavailable?
There is no pin-compatible drop-in replacement for CD74ACT244SM96 in alternate packages. The PDIP-20 version (CD74ACT244E) shares identical pinout and logic function but differs in thermal and mechanical properties. Migration requires board redesign due to footprint mismatch; no TSSOP, VSSOP, or QFN variants exist for this specific ACT244 variant in TI's portfolio.
CD74ACT244SM96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
CD74ACT244SM96 FAQ
1.How can I place an order for CD74ACT244SM96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT244SM96 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 CD74ACT244SM96 reliable?
The price and inventory of CD74ACT244SM96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT244SM96 is usually 5 days.
3.What payment methods are accepted for CD74ACT244SM96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT244SM96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT244SM96?
CD74ACT244SM96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT244SM96 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 CD74ACT244SM96?
For technical support, including CD74ACT244SM96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT244SM96 requirements.
6.How does Aetrix verify that CD74ACT244SM96 is sourced from the original manufacturer or authorized distributors?
All CD74ACT244SM96 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 CD74ACT244SM96 meets industry standards.
7.What is the process for return or replacement of CD74ACT244SM96?
All CD74ACT244SM96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT244SM96, 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 CD74ACT244SM96 part is unused and in its original packaging.
Return procedure for CD74ACT244SM96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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