參數(shù)資料
型號： 74ABT16500
廠商： Fairchild Semiconductor Corporation
英文描述： 18-Bit Universal Bus Transceivers with 3-STATE Outputs
中文描述： 18 - 3位通用總線收發(fā)器態(tài)輸出
文件頁數(shù)： 5/9頁
文件大?。?/td> 74K
代理商： 74ABT16500
5
www.fairchildsemi.com
7
AC Operating Requirements
Extended AC Electrical Characteristics
Note 10:
This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.).
Note 11:
This specification is guaranteed but not tested. The limits represent propagation delay with 250 pF load capacitors in place of the 50 pF load capac-
itors in the standard AC load. This specification pertains to single output switching only.
Note 12:
This specification is guaranteed but not tested. The limits represent propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.) with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load.
Note 13:
3-STATE delays are dominated by the RC network (500
, 250 pF) on the output and have been excluded from the datasheet.
Symbol
Parameter
T
A
=
+
25
°
C
V
CC
=
+
5V
C
L
=
50 pF
T
A
=
40
°
C to
+
85
°
C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
Min
4.5
4.5
Units
Min
4.5
4.5
Max
Max
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
S
(H)
t
S
(L)
t
H
(H)
t
H
(L)
t
W
(H)
t
W
(L)
t
W
(H)
t
W
(L)
Setup Time,
ns
A to CLKAB
Hold Time,
0
0
0
0
ns
A to CLKAB
Setup Time,
4.0
4.0
4.0
4.0
ns
B to CLKBA
Hold Time,
0
0
0
0
ns
B to CLKBA
Setup Time, A to LEAB
1.5
1.5
1.5
1.5
ns
or B to LEBA, CLK HIGH
Hold Time, A to LEAB
1.5
1.5
1.5
1.5
ns
or B to LEBA, CLK HIGH
Setup Time, A to LEAB
4.5
4.5
4.5
4.5
ns
or B to LEBA, CLK LOW
Hold Time, A to LEAB
1.5
1.5
1.5
1.5
ns
or B to LEBA, CLK LOW
Pulse Width,
LEAB or LEBA, HIGH
3.3
3.3
3.3
3.3
3.3
3.3
ns
Pulse Width, CLKAB
ns
or CLKBA, HIGH or LOW
3.3
3.3
Symbol
Parameter
T
A
=
40
°
C to
+
85
°
C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
18 Outputs Switching
(Note 10)
Min
Typ
1.5
T
A
=
40
°
C to
+
85
°
C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
1 Output Switching
(Note 11)
Min
2.0
T
A
=
40
°
C to
+
85
°
C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
18 Outputs Switching
(Note 12)
Min
2.5
Units
Max
6.5
Max
7.0
Max
9.9
t
PLH
t
PHL
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
ns
Data to Outputs
Propagation Delay
LEAB or LEBA to B or A
1.5
1.5
1.5
6.5
6.0
6.0
2.0
2.0
2.0
7.0
7.5
7.5
2.5
2.5
2.5
9.2
8.5
8.5
ns
Propagation Delay
1.5
1.5
6.2
6.2
2.0
2.0
7.7
7.7
2.5
2.5
8.5
8.5
ns
CLKAB or CLKBA to B or A
Output Enable Time
1.5
1.5
1.5
6.5
6.5
6.5
2.0
2.5
7.0
7.0
2.5
2.5
8.5
8.5
ns
Output Disable
(Note 13)
(Note 13)
ns
Time
1.5
6.5
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