74HC91 데이터 시트보기 (PDF) - Philips Electronics
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74HC91 Datasheet PDF : 7 Pages
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Philips Semiconductors
Nine wide Schmitt trigger buffer;
open drain outputs; inverting
Product specification
74HC/HCT9114
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Transfer characteristics are given below.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
An
0.3
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
VT+
positive-going
threshold
0.9 1.50 2.0 0.9 2.0 0.9 2.0 V
1.2 1.70 2.1 1.2 2.1 1.2 2.1
4.5 Fig.6
5.5
VT−
negative-going
threshold
0.7 1.06 1.4 0.7 1.4 0.7 1.4 V
0.8 1.27 1.7 0.8 1.7 0.8 2.7
4.5 Fig.6
5.5
VH
hysteresis (VT+ − VT−) 0.2 0.44 0.8 0.2 0.8 0.2 0.8 V
4.5 Fig.6
0.2 0.44 0.8 0.2 0.8 0.2 0.8
5.5
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
SYMBOL PARAMETER
74HCT
+25
−40 to +85
min. typ. max. min. max.
tPHL/ tPLZ propagation delay
An to Yn
17 31
39
tTHL
output transition time
7 15
19
−40 to +125
min. max.
47
22
TEST CONDITIONS
UNIT
VCC
(V)
WAVEFORMS
ns 4.5 Fig.7
ns 4.5 Fig.7
December 1990
6
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