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Texas Instruments CD74HCT244M96
- Part No.:
- CD74HCT244M96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT244M96.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,731
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Product details
Overview
CD74HCT244M96 from Texas Instruments is a non-inverting octal buffer/line driver with three-state outputs and dual active-low output enables (1OE, 2OE). It operates at 4.5 V to 5.5 V, delivers ±24 mA output drive per channel, exhibits 10 ns typical propagation delay at VCC = 5 V and CL = 15 pF, and supports industrial temperature range (–55°C to 125°C). It is used in bidirectional bus interfacing for microcontroller peripheral expansion.
For engineers reviewing the CD74HCT244M96 datasheet, CD74HCT244M96 pinout, CD74HCT244M96 application, or CD74HCT244M96 equivalent, key selection criteria include TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), high-current bus driving capability, identical pinout across HC/HCT244 family members, and SOIC-20 packaging for space-constrained PCB layouts.
Technical Context
The CD74HCT244M96 implements eight independent non-inverting buffer channels, each with three-state control governed by two shared active-low enables (1OE controls Y1–Y4; 2OE controls Y5–Y8). Its HCT logic family ensures direct compatibility with LSTTL inputs while maintaining CMOS power efficiency.
All input pins are buffered, and outputs feature high-current drive (±24 mA) with balanced rise/fall times and low output capacitance (20 pF). The device shares identical pin configuration with CD74HC244, CD74HCT241, and CD74HC241 - enabling drop-in substitution where voltage and timing requirements align.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, 4.5–5.5 V operation |
| Propagation Delay | 10 ns typical at VCC = 5 V, CL = 15 pF - enables reliable 30+ MHz bus operation |
| Output Drive | ±24 mA per channel - drives 15 LSTTL loads without external buffers |
| Input Thresholds | VIL ≤ 0.8 V (max), VIH ≥ 2.0 V (min) - ensures robust noise margin with legacy TTL systems |
| Operating Temp | –55°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Three-State Leakage | ±5 μA max at TA = –55°C to 125°C - prevents bus contention during disable |
| Supply Current | 160 μA max ICC at full temperature range - supports low-quiescent-power system design |
Pinout & Package
CD74HCT244M96 is housed in a 20-pin SOIC package (body size 12.80 mm × 7.50 mm), optimized for automated assembly and thermal performance (RθJA = 109.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A4, 2A1–2A4 | Buffer Inputs | Non-inverting data inputs for eight channels (Group 1: pins 2–5; Group 2: pins 13–16) |
| 1Y1–1Y4, 2Y1–2Y4 | Buffer Outputs | Three-state outputs corresponding to inputs (Group 1: pins 18–15; Group 2: pins 11–14) |
| 1OE, 2OE | Output Enables | Active-low controls for respective groups - simultaneous or independent bus gating |
| GND (pin 10), VCC (pin 20) | Power Terminals | Single-supply interface; requires local 0.1 μF bypass capacitor at VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting three-state buffering | Enables bidirectional bus isolation without signal inversion - critical for address/data bus sharing |
| Dual independent output enables | Allows selective activation of upper/lower four channels - reduces switching noise and power surges |
| High-current CMOS outputs | ±24 mA drive eliminates need for external bus transceivers in medium-load applications |
| LSTTL input compatibility | Accepts standard TTL logic levels directly - avoids level-shifter components in mixed-logic systems |
| Wide temperature operation | Validated from –55°C to +125°C - supports deployment in harsh-environment industrial PLCs and motor drives |
Applications
| Microcontroller I/O Expansion | Industrial Bus Interface |
|---|---|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 16-segment LED displays and relay banks. IC Role / Device Role / Timing Role: Non-inverting buffer isolating MCU pins from higher-current loads while preserving signal polarity and timing integrity. Use Value: Eliminates need for discrete transistor arrays; 10 ns propagation delay ensures synchronization with 48 MHz system clock. | Use Scenario: Interfacing a programmable logic controller (PLC) CPU module to distributed I/O racks over parallel backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver managing data flow between master and slave modules using shared address/data lines. Use Value: Dual OE pins allow time-multiplexed access to upper/lower byte lanes, reducing bus arbitration complexity. |
| Legacy System Upgrades | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74LS244 in a vintage test instrument's front-panel control board. IC Role / Device Role / Timing Role: Pin-compatible HCT-level replacement providing identical functionality with lower power and wider temp range. Use Value: Direct drop-in fit in existing SOIC-20 footprint; TTL-compatible inputs ensure no firmware or schematic changes required. | Use Scenario: Driving multiple analog multiplexer select lines from a single FPGA bank in automated test equipment. IC Role / Device Role / Timing Role: Fanout buffer distributing synchronized control signals while maintaining edge integrity across 8 channels. Use Value: Low output skew (<2 ns) and 20 pF CO ensure simultaneous switching across all 8 outputs - critical for glitch-free mux sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244N | Same HCT logic, identical pinout, PDIP-20 package | Limited to 0°C to 70°C commercial temp range; higher RθJA (84.6°C/W) | Select when cost-sensitive prototyping or through-hole assembly is required |
| CD74HC244M96 | HC variant: 2–6 V supply, higher VIH/VIL thresholds, lower drive (±7.8 mA) | Requires level translation when interfacing with 5 V TTL; unsuitable for 15-LSTTL load scenarios | Select only for mixed-voltage systems where 3.3 V or battery-powered operation is mandatory |
Compared with SN74HCT244N, CD74HCT244M96 offers extended temperature qualification and superior thermal resistance in SOIC; compared with CD74HC244M96, it provides guaranteed TTL compatibility and higher drive strength - making it the preferred choice for industrial 5 V bus interfacing.
Availability
CD74HCT244M96 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for CD74HCT244M96 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
CD74HCT244M96 belongs to TI's CD74HCT high-speed CMOS logic family, designed specifically for robust 5 V digital interfacing in demanding environments where reliability, noise immunity, and wide temperature operation are essential.
FAQ
What is the maximum output current per pin for CD74HCT244M96?
The CD74HCT244M96 supports ±24 mA DC output current per channel under recommended operating conditions. This rating allows direct driving of 15 LSTTL loads and ensures stable operation into typical PCB trace and connector impedances without external buffering. Exceeding this limit risks parametric shift or long-term reliability degradation.
Does CD74HCT244M96 require external pull-up resistors on its outputs?
No, CD74HCT244M96 does not require external pull-up resistors on its outputs. Its three-state outputs present high impedance (IOZ ≤ ±5 μA) when disabled, and actively drive to defined VOH/VOL levels when enabled. Pull-ups are unnecessary unless interfacing with open-drain systems - which is outside the intended use case of this push-pull buffer.
Can CD74HCT244M96 operate at 3.3 V supply voltage?
No, CD74HCT244M96 is not specified for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may not be reliably met, and output drive strength degrades significantly. For 3.3 V systems, consider CD74HC244M96 or SN74LVC244A instead.
How are the output enables (1OE and 2OE) configured on CD74HCT244M96?
CD74HCT244M96 features two active-low output enables: 1OE (pin 1) controls outputs Y1–Y4 (pins 18–15), and 2OE (pin 19) controls outputs Y5–Y8 (pins 11–14). Both must be low to enable their respective group; either high places its outputs in high-impedance state. This allows independent or simultaneous bus gating of upper and lower nibbles.
Is CD74HCT244M96 pin-compatible with CD74HC244M96?
Yes, CD74HCT244M96 is pin-compatible with CD74HC244M96 - both share identical SOIC-20 pinout, terminal assignments, and functional block diagram. However, they differ in supply voltage range, input thresholds, and output drive capability; electrical substitution requires verification of system-level voltage and loading requirements.
CD74HCT244M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HCT244M96 FAQ
1.How can I place an order for CD74HCT244M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT244M96 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 CD74HCT244M96 reliable?
The price and inventory of CD74HCT244M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT244M96 is usually 5 days.
3.What payment methods are accepted for CD74HCT244M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT244M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT244M96?
CD74HCT244M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT244M96 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 CD74HCT244M96?
For technical support, including CD74HCT244M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT244M96 requirements.
6.How does Aetrix verify that CD74HCT244M96 is sourced from the original manufacturer or authorized distributors?
All CD74HCT244M96 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 CD74HCT244M96 meets industry standards.
7.What is the process for return or replacement of CD74HCT244M96?
All CD74HCT244M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT244M96, 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 CD74HCT244M96 part is unused and in its original packaging.
Return procedure for CD74HCT244M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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