m5474hct640 STMicroelectronics, m5474hct640 Datasheet - Page 5

• Manufacturer Part Number: m5474hct640
• Description: Octal Transceiver 3-state Hct245 Inverting Hct640 Inverting, Hct643 Inverting/non Inverting
• Manufacturer: STMicroelectronics

AC ELECTRICAL CHARACTERISTICS (C
(*) C
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I
SWITCHING CHARACTERISTICS TEST WAVEFORM
Symbol
C
C
t
t
t
t
t
t
PD
t
t
C
TLH
THL
PLH
PHL
PZH
PHZ
I/OUT
PZL
PLZ
PD
IN
(*)
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
Output Transition
Time
Propagation
Delay Time
Output Enable
Time
Output Disable
Time
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
Parameter
V
(V)
4.5
4.5
4.5
4.5
4.5
4.5
CC
Test Conditions
(pF)
150
150
C
50
50
50
50
HCT640/643
L
HCT245
DIR, G
An, Bn
R
R
R
L
L
L
= 1K
= 1K
= 1K
L
= 50 pF, Input t
Min.
54HC and 74HC
T
A
Typ.
= 25
13
18
19
24
17
13
41
39
7
5
o
C
Max.
12
22
30
30
38
30
10
CC
r
(opr) = C
= t
Value
f
-40 to 85
Min.
M54/M74HCT245/640/643
= 6 ns)
PD
74HC
V
CC
Max.
15
28
38
38
48
38
10
o
f
C
IN
+ I
-55 to 125
CC
Min.
/8 (per circuit)
54HC
Max.
18
33
45
45
57
45
10
o
C
Unit
pF
pF
pF
ns
ns
ns
ns
ns
ns
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