參數(shù)資料
型號(hào): HC257
廠商: 意法半導(dǎo)體
英文描述: T-NPN- SI-AF PO
中文描述: 四2通道多路復(fù)用三態(tài)
文件頁(yè)數(shù): 5/14頁(yè)
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
相關(guān)PDF資料
PDF描述
HC257 NTE IC, TYPE: DUAL CHANNEL CURRENT MODE
HC257 IC-VERT DEFL CKT
HC257 TRANSISTOR,BJT,PNP,25V V(BR)CEO,2A I(C),TO-39
HC257 Peripheral Driver
HC257 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
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