74HC132 Datasheet, PDF (8/8 Pages) NXP Semiconductors – Quad 2-input NAND Schmitt trigger

Philips Semiconductors
Quad 2-input NAND Schmitt trigger
Product specification
74HC/HCT132
Application information
The slow input rise and fall times cause additional power dissipation, this can be calculated using the following formula:
P_ad = f_i × (t_r × I_CCa + t_f × I_CCa) × V_CC.
Where:
P_ad = additional power dissipation (µW)
f_i
= input frequency (MHz)
t_r
= input rise time (ns); 10% − 90%
t_f
= input fall time (ns); 10% − 90%
I_CCa = average additional supply current (µA)
Average I_CCa differs with positive or negative input transitions, as shown in Figs 14 and 15.
Fig.14 Average I_CC for HC Schmitt trigger devices;
linear change of V_i between 0.1 V_CC to
0.9 V_CC.
Fig.15 Average I_CC for HCT Schmitt trigger
devices; linear change of V_i between
0.1 V_CC to 0.9 V_CC.
HC/HCT132 used in a relaxation oscillator circuit, see Fig.16.
HC: f = _T-1-- ≈ _{0----.-8---1-R-----C---}
HCT: f = _T-1-- ≈ _{0----.-6----7-1----R-----C--}
Fig.16 Relaxation oscillator using HC/HCT132.
Note to Application information
All values given are typical unless otherwise specified.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
September 1993
8