Overview
The CD74HCT21M96 is a dual 4-input AND gate integrated circuit produced by Texas Instruments. This device is part of the HCT (High-Speed CMOS) logic family and is designed to operate within a wide range of supply voltages from 4.5 V to 5.5 V. It features two independent 4-input AND gates, each performing the Boolean function Y = A ● B ● C ● D in positive logic. The CD74HCT21M96 is available in a 14-pin SOIC (Small Outline Integrated Circuit) package and is RoHS compliant.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage | 4.5 to 5.5 | V |
| Operating Temperature Range | -55 to +125 | °C |
| Input Voltage (Low) | 0.8 | V |
| Input Voltage (High) | 2 | V |
| Output High Voltage (VOH) | 4.5 to 5.5 | V |
| Output Low Voltage (VOL) | 0 to 0.1 | V |
| Propagation Delay (tPD) | Typically 10 ns | ns |
| Junction-to-Ambient Thermal Resistance (RθJA) | 102.3 | °C/W |
| Package Type | SOIC (14-pin) | - |
| Body Size (Nominal) | 8.70 mm × 3.90 mm | mm |
Key Features
- LSTTL input logic compatible – VIL(max) = 0.8 V, VIH(min) = 2 V
- CMOS input logic compatible – II ≤ 1 µA at VOL, VOH
- Buffered inputs
- Wide operating temperature range: -55°C to +125°C
- Supports fanout up to 10 LSTTL loads
- Significant power reduction compared to LSTTL logic ICs
- Balanced CMOS push-pull outputs
- TTL-compatible CMOS inputs with lower threshold voltage for compatibility with older bipolar logic devices
Applications
- Combining power good signals
- Enabling digital signals
- Direct control of the RESET pin of a motor controller, requiring multiple input signals to be HIGH before enabling
- General-purpose digital logic circuits where 4-input AND gate functions are needed
Q & A
- What is the operating supply voltage range for the CD74HCT21M96?
The operating supply voltage range is from 4.5 V to 5.5 V.
- What is the operating temperature range for this device?
The operating temperature range is from -55°C to +125°C.
- How many AND gates are included in the CD74HCT21M96, and how many inputs does each gate have?
The device includes two independent 4-input AND gates.
- What type of inputs does the CD74HCT21M96 have?
The device has TTL-compatible CMOS inputs.
- What is the typical propagation delay for the CD74HCT21M96?
The typical propagation delay is around 10 ns.
- What is the recommended package type and body size for the CD74HCT21M96?
The recommended package type is SOIC (14-pin), with a nominal body size of 8.70 mm × 3.90 mm.
- How should unused inputs be handled in the CD74HCT21M96?
Unused inputs must be connected to either a logic high or logic low voltage to prevent them from floating.
- What are the thermal considerations for the CD74HCT21M96?
The device has a junction-to-ambient thermal resistance (RθJA) of 102.3 °C/W for the SOIC package.
- Can the CD74HCT21M96 drive larger capacitive loads?
Yes, but it is recommended to add a series resistor to limit the output current if larger capacitive loads are required.
- What are the power supply recommendations for the CD74HCT21M96?
A bypass capacitor (e.g., 0.1-μF) should be used close to the power terminal to prevent power disturbances.
