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M74HCT646 Datasheet(PDF) 7 Page - STMicroelectronics

No. de pieza M74HCT646
Descripción Electrónicos  HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV.
PDF  12 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HCT646 Datasheet(HTML) 7 Page - STMicroelectronics

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AC ELECTRICAL CHARACTERISTICS (CL =50 pF, Input tr =tf =6 ns)
Symbol
Parameter
Test Conditions
Value
Unit
VCC
(V)
CL
(pF)
TA =25
oC
54HC and 74HC
-40 to 85
oC
74HC
Min.
Typ.
Max.
Min.
Max.
tTLH
tTHL
Output Transition Time
4.5
50
7
12
15
ns
tPLH
tPHL
Propagation Delay Time
(BUS - BUS)
4.5
50
20
30
38
ns
4.5
150
25
38
48
ns
tPLH
tPHL
Propagation Delay Time
(CLOCK - BUS)
4.5
50
29
44
55
ns
4.5
150
34
52
65
ns
tPLH
tPHL
Propagation Delay Time
(SELECT - BUS)
4.5
50
24
34
43
ns
4.5
150
29
42
53
ns
tPZL
tPZH
3-State Output Enable Time
(G, DIR - BUS)
4.5
50
RL =1 K
Ω
26
38
48
ns
4.5
150
RL =1 K
Ω
31
46
58
ns
tPLZ
tPHZ
3-State Output Disable Time
(G, DIR - BUS)
4.5
50
RL =1 K
Ω
26
35
44
ns
fMAX
Maximum Clock Frequency
4.5
50
31
55
25
MHz
tW(H)
tW(L)
Minimum Pulse Width
4.5
50
8
15
19
ns
ts
Minimum Set-up Time
4.5
50
3
10
13
ns
th
Minimum Hold Time
4.5
50
5
5
ns
CIN
Input Capacitance
5
10
10
pF
CI/O
Bus Terminal Capacitance
13
pF
CPD (*)
Power Dissipation Capacitance
for HCT646
for HCT648
40
39
pF
(*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD
•VCC •fIN +ICC/8 (per bit)
M74HCT646/648
7/12



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