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SN74HC04N

Hex inverter, 9ns propagation, 2-6V, 14-PDIP

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Manufacturer Part：

SN74HC04N

Package：

14-PDIP

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Description

Product Overview

The SN74HC04N from Texas Instruments is a hex inverter containing 6 independent logic inverter gates. With 9ns propagation delay and 2-6V supply, it is the fundamental digital logic building block for signal inversion, clock buffering, and oscillator circuits. Packaged in 14-PDIP.

Key Specifications

Logic Family 74HC (High-Speed CMOS)
Function Hex inverter
Channels 6 (independent)
Propagation Delay 9ns (typ at 4.5V)
Supply Voltage 2V to 6V
Output Current +/-5.2mA (at 4.5V)
Package 14-PDIP
Operating Temperature -40 to +85 C

Features

  • 6 independent inverter gates
  • Standard CMOS input thresholds (50% VCC)
  • 9ns propagation delay
  • Direct LSTTL drive capability
  • Pin-compatible with 74HC14 (Schmitt version)
  • Crystal oscillator circuit construction

Applications

  • Signal inversion and buffering
  • Crystal oscillator circuits
  • Clock distribution and buffering
  • Logic level inversion

The SN74HC04N from Texas Instruments contains six independent inverter gates in a 14-PDIP package. Each inverter performs the NOT function: a HIGH input produces a LOW output and vice versa. The 74HC04N is the standard (non-Schmitt) version, with switching thresholds at approximately 50% of VCC. It is pin-compatible with the 74HC14N Schmitt-trigger inverter, allowing easy substitution when hysteresis is needed. The 9ns propagation delay at 4.5V supports moderate-speed digital applications. Two inverters in series form a non-inverting buffer; an odd number of inverters with feedback forms a ring oscillator. The 74HC04 is commonly used with a crystal and feedback resistor to build a Pierce oscillator for microcontroller clock generation.

Each inverter in the 74HC04N uses a CMOS push-pull output stage with complementary N-channel and P-channel MOSFETs. When the input is HIGH, the N-channel transistor turns on and the P-channel turns off, pulling the output LOW. When the input is LOW, the P-channel turns on and the N-channel turns off, pulling the output HIGH. The input switching threshold is approximately 50% of VCC. For crystal oscillator applications, the Pierce configuration uses one inverter as the gain element, with the crystal providing feedback between input and output, and capacitors to ground on both sides setting the load capacitance. A feedback resistor (1-10MOhm) biases the inverter into its linear region for oscillator startup.

Pin Name Function
1 1A Gate 1 input
2 1Y Gate 1 output (inverted)
3 2A Gate 2 input
4 2Y Gate 2 output
5 3A Gate 3 input
6 3Y Gate 3 output
7 GND Ground
8 4Y Gate 4 output
9 4A Gate 4 input
10 5Y Gate 5 output
11 5A Gate 5 input
12 6Y Gate 6 output
13 6A Gate 6 input
14 VCC Supply voltage (2-6V)
  • Signal inversion and logic level conversion between 3.3V and 5V domains
  • Pierce crystal oscillator for MCU clock generation using one inverter
  • Clock buffering and distribution with 9ns propagation delay
  • Ring oscillator construction using odd number of inverter stages
Model Manufacturer Key Difference
74HC14N TI Schmitt-trigger version with hysteresis
74HCT04N TI TTL-compatible input thresholds
74LS04N TI Original TTL version, higher power
CD4069UBE TI CMOS 4000 series, 3-15V, slower
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