參數(shù)資料
型號(hào): 74HC7541
廠商: NXP Semiconductors N.V.
英文描述: Octal Schmitt trigger buffer/line driver; 3-state
中文描述: 八路施密特觸發(fā)緩沖器/線路驅(qū)動(dòng)器,3態(tài)
文件頁(yè)數(shù): 6/7頁(yè)
文件大?。?/td> 55K
代理商: 74HC7541
December 1990
6
Philips Semiconductors
Product specification
Octal Schmitt trigger buffer/line driver; 3-state
74HC/HCT7541
DC CHARACTERISTICS FOR 74HCT
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
Note to HCT types
The value of additional quiescent supply current (
I
CC
) for a unit load of 1 is given in the family specifications.
To determine
I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
TRANSFER CHARACTERISTICS FOR 74HCT
Voltages are referred to GND (ground = 0 V)
INPUT
UNIT LOAD COEFFICIENT
OE
1
OE
2
A
n
1.30
1.30
0.20
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HCT
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
3-state output enable time
OE
n
to Y
n
3-state output disable time
OE
n
to Y
n
output transition time
19
32
40
48
ns
4.5
Fig.8
t
PZH
/ t
PZL
18
32
40
48
ns
4.5
Fig.8
t
PHZ
/ t
PLZ
20
32
40
48
ns
4.5
Fig.8
t
THL
/ t
TLH
5
12
15
18
ns
4.5
Fig.8
SYMBOL
PARAMETER
T
amb
(
°
C)
UNIT
TEST CONDITIONS
74HCT
V
CC
(V)
WAVEFORMS
+
25
40 to
+
85
40 to
+
125
min.
typ.
max. min.
max.
min.
max.
V
T
+
positive-going threshold
2.0
2.1
2.0
2.1
2.0
2.1
V
4.5
5.5
4.5
5.5
4.5
5.5
Figs 6 and 7
V
T
negative-going threshold
0.70
0.80
0.17
0.17
0.64
0.74
0.60
0.70
V
Figs 6 and 7
V
H
hysteresis (V
T
+
V
T
)
0.23
0.23
V
Figs 6 and 7
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