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 A
74HCT: I OH = 4.0 mA; I IH = 1.0 A; I OL = 4.0 A; I IL = 1.0 A
74LS-TTL: I OH = 0.4 mA; I IH = 20.0 A; I OL = 8.0 A; I IL = 0.4 mA
(a) 1; (b) 10
Further Reading
1. 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, Application
Note 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, and
BiCMOS, 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.
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 A
74HCT: I OH = 4.0 mA; I IH = 1.0 A; I OL = 4.0 A; I IL = 1.0 A
74LS-TTL: I OH = 0.4 mA; I IH = 20.0 A; I OL = 8.0 A; I IL = 0.4 mA
(a) 1; (b) 10
Further Reading
1. 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, Application
Note 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, and
BiCMOS, 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.