M74HCT646 STMICROELECTRONICS [STMicroelectronics], M74HCT646 Datasheet - Page 7

• Manufacturer Part Number: M74HCT646
• Description: HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV.
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

AC ELECTRICAL CHARACTERISTICS (C
(*) C
(Refer to Test Circuit). Average operting current can be obtained by the following equation. I
Symbol
C
t
f
t
t
t
t
t
t
t
t
t
t
t
C
PD
t
t
MAX
W(H)
W(L)
C
TLH
THL
PLH
PHL
PLH
PHL
PLH
PHL
PZH
PHZ
PZL
PLZ
t
t
PD
I/O
s
h
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
(BUS - BUS)
Propagation Delay Time
(CLOCK - BUS)
Propagation Delay Time
(SELECT - BUS)
3-State Output Enable Time
(G, DIR - BUS)
3-State Output Disable Time
(G, DIR - BUS)
Maximum Clock Frequency
Minimum Pulse Width
Minimum Set-up Time
Minimum Hold Time
Input Capacitance
Bus Terminal Capacitance
Power Dissipation Capacitance
Parameter
V
(V)
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
4.5
CC
Test Conditions
(pF)
L
150
150
150
150
C
50
50
50
50
50
50
50
50
50
50
= 50 pF, Input t
L
for HCT646
for HCT648
R
R
R
L
L
L
= 1 K
= 1 K
= 1 K
Min.
31
CC
54HC and 74HC
r
(opr) = C
= t
T
A
f
Typ.
= 25
= 6 ns)
20
25
29
34
24
29
26
31
26
55
13
40
39
7
8
3
5
PD
o
V
C
Value
CC
Max.
12
30
38
44
52
34
42
38
46
35
15
10
10
5
f
IN
+ I
M74HCT646/648
CC
-40 to 85
Min.
25
/8 (per bit)
74HC
Max.
15
38
48
55
65
43
53
48
58
44
19
13
10
5
o
C
MHz
Unit
pF
pF
pF
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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