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参数资料
| 型号： | 74AHCT257 |
| 厂商： | NXP Semiconductors N.V. |
| 英文描述： | Quadruple 2-Input Positive-AND Gates 14-SOIC -40 to 85 |
| 中文描述： | 四2输入多路复用器，三态 |
| 文件页数： | 9/20页 |
| 文件大小： | 98K |
| 代理商： | 74AHCT257 |
2000 Apr 03
9
Philips Semiconductors
Product specification
Quad 2-input multiplexer; 3-state
74AHC257;
74AHCT257
AC CHARACTERISTICS
Type 74AHC257
GND = 0 V; t
r
= t
f
≤
3.0 ns.
Notes
1.
2.
Typical values at V
CC
= 3.3 V.
Typical values at V
CC
= 5.0 V.
SYMBOL
PARAMETER
TEST CONDITIONS
T
amb
(
°
C)
UNIT
WAVEFORMS
C
L
25
40 to +85
40 to +125
MIN.
TYP.
MAX.
MIN.
MAX.
MIN.
MAX.
V
CC
= 3.0 to 3.6 V;
note 1
t
PHL
/t
PLH
propagation delay
nI
0
to nY; nI
1
to nY
propagation delay
S to nY
3-state output enable
time OE to nY
3-state output disable
time OE to nY
propagation delay
nI
0
to nY; nI
1
to nY
propagation delay
S to nY
3-state output enable
time OE to nY
3-state output disable
time OE to nY
see Figs 6
and 8
15 pF
4.2
9.3
1.0
11.0
1.0
12.0
ns
5.2
11.0
1.0
13.0
1.0
14.0
ns
t
PZH
/t
PZL
see Figs 7
and 8
4.5
10.5
1.0
12.5
1.0
13.5
ns
t
PHZ
/t
PLZ
5.1
9.5
1.0
11.0
1.0
11.5
ns
t
PHL
/t
PLH
see Figs 6
and 8
50 pF
6.0
12.8
1.0
14.5
1.0
16.0
ns
7.4
14.5
1.0
16.5
1.0
18.5
ns
t
PZH
/t
PZL
see Figs 7
and 8
6.4
14.0
1.0
16.0
1.0
17.5
ns
t
PHZ
/t
PLZ
7.2
12.0
1.0
13.5
1.0
14.5
ns
V
CC
= 4.5 to 5.5 V;
note 2
t
PHL
/t
PLH
propagation delay
nI
0
to nY; nI
1
to nY
propagation delay
S to nY
3-state output enable
time OE to nY
3-state output disable
time OE to nY
propagation delay
nI
0
to nY; nI
1
to nY
propagation delay
S to nY
3-state output enable
time OE to nY
3-state output disable
time OE to nY
see Figs 6
and 8
15 pF
2.9
5.9
1.0
7.0
1.0
7.5
ns
3.5
6.8
1.0
8.0
1.0
8.5
ns
t
PZH
/t
PZL
see Figs 7
and 8
3.2
6.8
1.0
8.0
1.0
8.5
ns
t
PHZ
/t
PLZ
3.4
6.5
1.0
7.0
1.0
8.5
ns
t
PHL
/t
PLH
see Figs 6
and 8
50 pF
4.2
7.9
1.0
9.0
1.0
11.5
ns
5.0
8.8
1.0
10.0
1.0
12.5
ns
t
PZH
/t
PZL
see Figs 7
and 8
4.5
8.8
1.0
10.0
1.0
12.5
ns
t
PHZ
/t
PLZ
4.9
7.9
1.0
9.0
1.0
9.5
ns
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