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SN54HCT646 Datasheet(PDF) 6 Page - Texas Instruments

Part # SN54HCT646
Description  OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN54HCT646 Datasheet(HTML) 6 Page - Texas Instruments

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SN54HCT646, SN74HCT646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS178C – MARCH 1984 – REVISED MARCH 2003
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range, CL = 50 pF
(unless otherwise noted) (see Figure 2)
PARAMETER
FROM
TO
VCC
TA = 25°C
SN54HCT646
SN74HCT646
UNIT
PARAMETER
(INPUT)
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
f
4.5 V
31
54
22
27
MHz
fmax
5.5 V
36
64
24
29
MHz
CLKBA or CLKAB
AorB
4.5 V
18
36
54
45
CLKBA or CLKAB
A or B
5.5 V
16
32
49
41
t d
AorB
BorA
4.5 V
14
27
41
34
ns
tpd
A or B
B or A
5.5 V
12
24
37
31
ns
SBA
SAB†
AorB
4.5 V
20
38
57
48
SBA or SAB†
A or B
5.5 V
17
34
51
43
t
OE
AorB
4.5 V
25
49
74
61
ns
ten
OE
A or B
5.5 V
22
44
67
55
ns
tdi
OE
AorB
4.5 V
25
49
74
61
ns
tdis
OE
A or B
5.5 V
22
44
67
55
ns
t
DIR
AorB
4.5 V
25
49
74
61
ns
ten
DIR
A or B
5.5 V
22
44
67
55
ns
tdi
DIR
AorB
4.5 V
25
49
74
61
ns
tdis
DIR
A or B
5.5 V
22
44
67
55
ns
tt
Any
4.5 V
9
12
18
15
ns
tt
Any
5.5 V
7
11
16
14
ns
† These parameters are measured with the internal output state of the storage register opposite that of the bus input.
switching characteristics over recommended operating free-air temperature range, CL = 150 pF
(unless otherwise noted) (see Figure 2)
PARAMETER
FROM
TO
VCC
TA = 25°C
SN54HCT646
SN74HCT646
UNIT
PARAMETER
(INPUT)
(OUTPUT)
VCC
MIN
TYP
MAX
MIN
MAX
MIN
MAX
UNIT
CLKBA or CLKAB
AorB
4.5 V
24
53
80
66
CLKBA or CLKAB
A or B
5.5 V
22
47
52
60
t d
AorB
BorA
4.5 V
22
44
67
55
ns
tpd
A or B
B or A
5.5 V
20
39
60
50
ns
SBA
SAB†
AorB
4.5 V
26
55
83
69
SBA or SAB†
A or B
5.5 V
24
49
74
62
OE
AorB
4.5 V
33
66
100
87
t
OE
A or B
5.5 V
22
59
90
74
ns
ten
DIR
AorB
4.5 V
33
66
100
87
ns
DIR
A or B
5.5 V
22
59
90
74
tt
Any
4.5 V
17
42
63
53
ns
tt
Any
5.5 V
14
38
57
48
ns
† These parameters are measured with the internal output state of the storage register opposite that of the bus input.
operating characteristics, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance
No load
50
pF
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.


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