Fairchild Description and Family Characteristics Data Handbook
Summary
The VHC logic family offers high-speed, low-noise digital solutions designed to bridge the performance gap between older CMOS and modern high-speed standards. This manual provides comprehensive technical data sheets covering AC/DC specifications, superior noise immunity, and low dynamic power consumption critical for battery-operated devices. It is ideal for electrical engineers and designers requiring robust signal integrity and reliable interfacing across disparate systems (e.g., 3V to 5V logic levels).
Page 1 Text Content
escrip tio an am ily C aracteristics
August 1993 Revised December 1999
Description and Family Characteristics
Family Features VHC speeds 60% faster than HCMOS Guaranteed noise performance VOLP typically less than 1V High Noise Immunity VNIH = VNIL = 28% for VHC VIH = 2.0V, VIL = 0.8V for VHCT Output Drive of ±8 m A at 5V VCC and ±4 m A at 3V VCC AC performance specifications at 3V and 5V and at 15 p F and 50 p F Loads Low static ICC and low IOZ Operation from 2.0V–5.5V VCC for VHC Operation from 4.5V–5.5V VCC for VHCT
FIGURE 1.
Human Body Model (HBM) ESD > ±2 k V Charged Device Model (CDM) ESD > ±1 k V Latch-up protection > ±300 m A Inputs allow 0V–7V applied, regardless of supply voltage SOIC, TSSOP, and PDIP Packaging Industry Standard Functions and Pinouts
AC Performance The VHC family helps to fill the void between HCMOS and FACT AC families as it offers the speed of FACT with the Low Noise of HCMOS. The VHC speed to noise ratio allows designers to achieve propagation delays up to three times faster than HCMOS and is ideal where the full drive of CMOS FACT is not needed. Figure 1 illustrates the speed to noise ratio for HCMOS, FACT, and VHC. Figure 2 compares the HC244, AC244 and VHC244 speed versus capacitive load.
FIGURE 2.
FACT is a trademark of Fairchild Semiconductor Corporation.
© 1999 Fairchild Semiconductor Corporation MS011627 www.fairchildsemi.com
Page Summary Contents For Fairchild Description and Family Characteristics Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 6 |
| File Size | 85.48 KB |
| Published | July 10, 2026 |
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Frequently Asked Questions
Which VHC family feature makes it quick and low noise?
The VHC speed to noise ratio offers the speed of FACT with the Low Noise of HCMOS.
What voltage range can the VHC family operate at?
VHC can operate from 2.0V–5.5V, while VHCT operates from 4.5V–5.5V.
How are different logic levels handled with this technology?
The VHC/VHCT family allows linking systems of different technologies, such as converting signals between 3V and 5V logic levels.
What voltages can be applied to the inputs?
Inputs allow 0V–7V to be applied, regardless of the supply voltage.