Overview
The CD74HCT00E, produced by Texas Instruments, is a high-speed CMOS logic quad 2-input NAND gate. This device is part of the 74HCT series, which is known for its compatibility with both CMOS and TTL (Transistor-Transistor Logic) input levels. It operates within a voltage range of 4.5V to 5.5V and has a wide operating temperature range from -55°C to +125°C. The CD74HCT00E contains four independent 2-input NAND gates, each performing the Boolean function Y = A ● B in positive logic.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.5 | 5.5 | 5.5 | V |
| High-Level Input Voltage (VIH) | 2 | V | ||
| Low-Level Input Voltage (VIL) | 0.8 | V | ||
| Input Transition Time | 400 | 500 | ns | |
| Operating Free-Air Temperature (TA) | -55 | 125 | °C | |
| Propagation Delay (tpd) | 8 | 20 | 30 | ns |
| Output High Current (IOH) | -25 | mA | ||
| Output Low Current (IOL) | 25 | mA | ||
| Junction Temperature (TJ) | 150 | °C |
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
- Clamp diode structure for input and output protection
Applications
- Alarm and tamper detect circuits
- S-R latch circuits
- General logic functions in digital systems
- Buffering and driving TTL loads
Q & A
- What is the CD74HCT00E? The CD74HCT00E is a high-speed CMOS logic quad 2-input NAND gate produced by Texas Instruments.
- What is the operating voltage range of the CD74HCT00E? The operating voltage range is from 4.5V to 5.5V.
- What is the operating temperature range of the CD74HCT00E? The operating temperature range is from -55°C to +125°C.
- How many independent NAND gates does the CD74HCT00E contain? The CD74HCT00E contains four independent 2-input NAND gates.
- What is the propagation delay of the CD74HCT00E? The propagation delay ranges from 8 ns to 30 ns depending on the load and voltage.
- What are the key features of the CD74HCT00E? Key features include LSTTL and CMOS input compatibility, buffered inputs, wide operating temperature range, and balanced CMOS push-pull outputs.
- What are some common applications of the CD74HCT00E? Common applications include alarm and tamper detect circuits, S-R latch circuits, and general logic functions in digital systems.
- How should unused inputs be handled on the CD74HCT00E? Unused inputs must be terminated at VCC or GND to avoid floating inputs. A pull-up or pull-down resistor can be used if necessary.
- What is the maximum output current of the CD74HCT00E? The maximum continuous output current is ±25 mA.
- What is the junction temperature limit for the CD74HCT00E? The junction temperature limit is 150°C for plastic packages and 175°C for hermetic packages or die.
