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74LV257PW bảng dữ liệu(PDF) 6 Page - NXP Semiconductors

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Giải thích chi tiết về linh kiện  Quad 2-input multiplexer 3-State
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Philips Semiconductors
Product specification
74LV257
Quad 2-input multiplexer (3-State)
1998 May 20
6
AC CHARACTERISTICS
GND = 0V; tr = tf ≤ 2.5ns; CL = 50pF; RL = 1KΩ
CONDITION
LIMITS
SYMBOL
PARAMETER
WAVEFORM
CONDITION
–40 to +85
°C
–40 to +125
°C
UNIT
VCC(V)
MIN
TYP1
MAX
MIN
MAX
1.2
65
t
/t
Propagation delay
nl0 to nY
Figure 1
2.0
22
43
51
ns
tPHL/tPLH
nl0 to nY
nl1 to nY
Figure 1
2.7
16
31
38
ns
3.0 to 3.6
122
25
30
1.2
85
tPHL/tPLH
Propagation delay
Figure 1
2.0
29
56
66
ns
tPHL/tPLH
gy
S to nY
Figure 1
2.7
21
41
49
ns
3.0 to 3.6
162
33
39
1.2
60
tPZH/tPZL
3-State output enable time
Figure 2
2.0
20
39
46
ns
tPZH/tPZL
OE to nY
Figure 2
2.7
15
29
34
ns
3.0 to 3.6
112
23
27
1.2
65
t
/t
3-State output disable time
Figure 2
2.0
24
40
49
ns
tPHZ/tPLZ
OE to nY
Figure 2
2.7
18
32
37
ns
3.0 to 3.6
142
26
30
NOTES:
1. Unless otherwise stated, all typical values are measured at Tamb = 25°C
2. Typical values are measured at VCC = 3.3 V.
AC WAVEFORMS
VM = 0.5 × VCC at VCC < 2.7 V
VM = 1.5 V at VCC ≥ 2.7 V
VX = VOL + 0.3 V at VCC ≥ 2.7 V
VX = VOL + 0.1 × VCC at VCC < 2.7 V
VY = VOH – 0.3 V at VCC ≥ 2.7V
VY = VOH – 0.1 × VCC at VCC < 2.7 V
VOL and VOH are the typical output voltage drop that occur with the
output load.
SV00641
VM
S, nI0, nI1
INPUTS
nY OUTPUT
VM
tPLH
tPHL
GND
VCC
VOL
VOH
Figure 1. Input (S, nl0, nl1) to output (nY) propagation delays.
SV00642
outputs
disabled
outputs
enabled
outputs
enabled
tPHZ
tPZH
tPZL
tPLZ
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
OUTPUT
LOW-to-OFF
OFF-to-LOW
VM
VM
OE INPUT
VX
VOL
VOH
VY
GND
GND
VCC
VI
VM
Figure 2. 3-State enable and disable times.


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