Datasheet

December 1990 5
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver; 3-state 74HC/HCT7541
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications” .
Transfer characteristics are given below (not applicable for OE
n
inputs).
Output capability: bus driver
I
CC
category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
=t
f
= 6 ns; C
L
= 50 pF
TRANSFER CHARACTERISTICS FOR 74HC
Voltages are referred to GND (ground = 0 V)
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
t
PHL
/ t
PLH
propagation delay
A
n
to Y
n
39
14
11
120
24
20
150
30
26
180
36
32
ns 2.0
4.5
6.0
Fig.8
t
PZH
/ t
PZL
3-state output enable time
OE
n
to Y
n
44
16
13
160
32
27
200
40
34
240
48
41
ns 2.0
4.5
6.0
Fig.8
t
PHZ
/ t
PLZ
3-state output disable time
OE
n
to Y
n
58
21
17
160
32
27
200
40
34
240
48
41
ns 2.0
4.5
6.0
Fig.8
t
THL
/ t
TLH
output transition time 14
5
4
60
12
10
75
15
13
90
18
15
ns 2.0
4.5
6.0
Fig.8
SYMBOL PARAMETER
T
amb
(°C)
UNIT
TEST CONDITIONS
74HC
V
CC
(V)
WAVEFORMS+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
V
T+
positive-going threshold 1.50
3.15
4.20
1.50
3.15
4.20
1.50
3.15
4.20
V 2.0
4.5
6.0
Figs 6 and 7
V
T−
negative-going threshold 0.30
1.35
1.80
0.30
1.35
1.80
0.30
1.35
1.80
V 2.0
4.5
6.0
Figs 6 and 7
V
H
hysteresis (V
T+
− V
T−
) 0.10
0.25
0.30
0.20
0.40
0.50
0.10
0.25
0.30
0.10
0.25
0.30
V 2.0
4.5
6.0
Figs 6 and 7