Digital Electronics: Principles, Devices and Applications

Logic Families 187(a) the number of 74LS-TTL inputs that can be reliably driven from a single 4000B output;(b) the number of 74LS-TTL inputs that can be reliably driven from a single 74HCT output.4000B: I OH = 0.4 mA; I IH = 1.0 A; I OL = 0.4 A; I IL = 1.0 A74HCT: I OH = 4.0 mA; I IH = 1.0 A; I OL = 4.0 A; I IL = 1.0 A74LS-TTL: I OH = 0.4 mA; I IH = 20.0 A; I OL = 8.0 A; I IL = 0.4 mA(a) 1; (b) 10Further Reading1. Tocci, R. J. (2006) Digital Systems – Principles and Applications, Prentice-Hall Inc., NJ, USA.2. Demassa, T. A. and Ciccone, Z. (1995) Digital Integrated Circuits, John Wiley & Sons, Inc., New York, USA.3. Fairchild Semiconductor (August 1973) 74C Family Characteristics, Application Note 90, South Portland, ME,USA.4. Wakeman, L. (April 1998) DC Electrical Characteristics of MM74HC High-speed CMOS Logic, ApplicationNote 313, Fairchild Semiconductor, South Portland, ME, USA.5. Funk, R. E. (October 2002) Understanding Buffered and Unbuffered CD4XXXB-series Device Characteristics,Application Report SCHA004, Texas Instruments, USA.6. Buchanan, J. E. and Buchanan, B. D. (1995) Signal and Power Integrity in Digital Systems: TTL, CMOS, andBiCMOS, McGraw-Hill Companies, NJ, USA.7. Lancaster, D. E. (1997) CMOS Cookbook, Butterworth-Heinemann, USA.8. Elmasry, M. I. (1994) BiCMOS Integrated Circuit Design, IEEE Press, USA.