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參數(shù)資料
| 型號： | HC257 |
| 廠商： | System Logic Semiconductor Co., Ltd. |
| 英文描述： | Darlington Bipolar Transistor; Transistor Polarity:N Channel; Power Dissipation:0.4W; C-E Breakdown Voltage:40V; DC Current Gain Min (hfe):7000; Collector Current:0.3A; Package/Case:3-TO-92; DC Current Gain Max (hfe):70000 |
| 中文描述： | 四2輸入數(shù)據(jù)選擇器/多路與三態(tài)輸出 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大?。?/td> | 315K |
| 代理商： | HC257 |
74VHC257
5/14
Table 7: AC Electrical Characteristics
(Input t
r
= t
f
= 3ns)
(*) Voltage range is 3.3V
±
0.3V
(**) Voltage range is 5.0V
±
0.5V
Table 8: Capacitive Characteristics
1) C
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 operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/4 (per
channel)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
T
A
= 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time A, B to Y
3.3
(*)
3.3
(*)
5.0
(**)
5.0
(**)
3.3
(*)
3.3
(*)
5.0
(**)
5.0
(**)
3.3
(*)
3.3
(*)
5.0
(**)
5.0
(**)
3.3
(*)
5.0
(**)
15
5.8
9.3
1.0
11.0
1.0
11.0
ns
50
8.3
12.8
1.0
14.5
1.0
14.5
15
3.6
5.9
1.0
7.0
1.0
7.0
50
5.1
7.9
1.0
9.0
1.0
9.0
t
PLH
t
PHL
Propagation Delay
Time
SELECT to Y
15
7.0
11.0
1.0
13.0
1.0
13.0
ns
50
9.5
14.5
1.0
16.5
1.0
16.5
15
4.0
6.8
1.0
8.0
1.0
8.0
50
5.5
8.8
1.0
10.0
1.0
10.0
t
PZL
t
PZH
Output Enable
Time
15
R
L
= 1K
R
L
= 1K
R
L
= 1K
R
L
= 1K
R
L
= 1K
R
L
= 1K
6.7
10.5
1.0
12.5
1.0
12.5
ns
50
9.2
14.0
1.0
16.0
1.0
16.0
15
3.6
6.8
1.0
8.0
1.0
8.0
50
5.1
8.8
1.0
10.0
1.0
10.0
t
PLZ
t
PHZ
Output Disable
Time
50
8.6
12.0
1.0
13.5
1.0
13.5
ns
50
5.7
7.9
1.0
9.0
1.0
9.0
Symbol
Parameter
Test Condition
Value
Unit
T
A
= 25°C
-40 to 85°C
-55 to 125°C
Min.
Typ.
Max.
Min.
Max.
Min.
Max.
C
IN
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
(note 1)
6
10
10
10
pF
C
OUT
8
pF
C
PD
18
pF
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