HD74AC Datasheet, PDF (8/52 Pages) Hitachi Semiconductor – HD74AC Series Common Information

FACT Descriptions and Family Characteristics
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6
5
4
3
2
1
0
–1
–2
–0.2
V_CC = 5.0 V, Ta = 25°C
V_IN/I_IN
–0.1
0
0.1
0.2
Current (mA)
Figure 7 Input Characteristics V_IN/I_IN
1.8 Choice of Voltage Specifications
To obtain better performance and higher density, semiconductor technologies are reducing the vertical and
horizontal dimensions of integrated device structures. Due to a number of electrical limitations in the
manufacture of VLSI devices and the need for low-voltage operation in memory cards, the JEDEC
committee decided to establish interface standards for devices operating at 3.3 V ±0.3 V. To this end,
Hitachi guarantees all of its devices operational at 3.3 V ±0.3 V. Note also that AC and DC specifications
are guaranteed between 3.0 and 5.5 V. Operation of FACT logic is also guaranteed from 2.0 to 6.0 V on
V_CC.
Operating Voltage Ranges
• FACT = 2.0 to 6.0 V
• ALS = 5.0 V ±10%
• LS = 5.0 V ±5%
• HC = 2.0 to 6.0 V
1.9 FACT Replaces LS, ALS, HCMOS
The Advanced CMOS family is specifically designed to outperform the LS, ALS, and HCMOS families.
Figure 8 shows the relative position of various logic families in speed/power performance.
Table 1 summarizes the key performance specifications for various competitive technology logic families.
Table 2 compares propagation delays.
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