74HC257 查看數據表（PDF） - NXP Semiconductors.
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74HC257 Datasheet PDF : 17 Pages
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NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
Table 6. Static characteristics …continued
At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Symbol Parameter
Conditions
25 °C
IOZ
ICC
ΔICC
CI
OFF-state
output current
supply current
additional supply
current
input capacitance
VI = VIH or VIL; VCC = 5.5 V;
VO = VCC or GND per input
pin; other inputs at VCC or
GND; IO = 0 A
VI = VCC or GND; IO = 0 A;
VCC = 5.5 V
VI = VCC − 2.1 V;
other inputs at VCC or GND;
VCC = 4.5 V to 5.5 V; IO = 0 A
per input pin; nI0, nI1 inputs
per input pin; OE input
per input pin; S input
Min Typ Max
-
- ±0.5
-
- 8.0
- 40 144
- 135 486
- 70 252
- 3.5 -
−40 °C to
+85 °C
Min Max
- 80
- 180
- 608
- 315
−40 °C to Unit
+125 °C
Min Max
- 160 μA
μA
- 196 μA
- 662 μA
- 343 μA
pF
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); For test circuit see Figure 8.
Symbol Parameter
Conditions
25 °C
74HC257
tpd
propagation delay
ten
enable time
tdis
disable time
nl0 to nY or nl1 to nY;
see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
S to nY; see Figure 6
VCC = 2.0 V
VCC = 4.5 V
VCC = 5.0 V; CL = 15 pF
VCC = 6.0 V
OE to nY; see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
OE to nY; see Figure 7
VCC = 2.0 V
VCC = 4.5 V
VCC = 6.0 V
Typ Max
[1]
36 110
13
22
11
-
10
19
47 150
17
30
14
-
14
26
[2]
33 150
12
30
10
26
[3]
41 150
15
30
12
26
−40 °C to
+85 °C
Max
−40 °C to Unit
+125 °C
Max
140
165 ns
28
33 ns
-
-
ns
24
28 ns
190
225 ns
38
45 ns
-
-
ns
33
38 ns
190
225 ns
38
45 ns
33
38 ns
190
225 ns
38
45 ns
33
38 ns
74HC_HCT257_5
Product data sheet
Rev. 05 — 13 January 2010
© NXP B.V. 2010. All rights reserved.
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