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74LV257DB View Datasheet(PDF) - Philips Electronics

Part Name
Description
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74LV257DB
Philips
Philips Electronics Philips
74LV257DB Datasheet PDF : 12 Pages
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Philips Semiconductors
Quad 2-input multiplexer (3-State)
Product specification
74LV257
AC CHARACTERISTICS
GND = 0V; tr = tf 2.5ns; CL = 50pF; RL = 1K
SYMBOL
PARAMETER
WAVEFORM
CONDITION
VCC(V)
1.2
tPHL/tPLH
Propagation delay
nl0 to nY
nl1 to nY
Figure 1
2.0
2.7
3.0 to 3.6
1.2
tPHL/tPLH
Propagation delay
S to nY
2.0
Figure 1
2.7
3.0 to 3.6
1.2
tPZH/tPZL
3-State output enable time
OE to nY
Figure 2
2.0
2.7
3.0 to 3.6
1.2
tPHZ/tPLZ
3-State output disable time
OE to nY
Figure 2
2.0
2.7
3.0 to 3.6
NOTES:
1. Unless otherwise stated, all typical values are measured at Tamb = 25°C
2. Typical values are measured at VCC = 3.3 V.
LIMITS
–40 to +85 °C
MIN TYP1 MAX
–40 to +125 °C
MIN MAX
65
22
43
51
16
31
38
122
25
30
85
29
56
66
21
41
49
162
33
39
60
20
39
46
15
29
34
112
23
27
65
24
40
49
18
32
37
142
26
30
UNIT
ns
ns
ns
ns
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.
VCC
S, nI0, nI1
VM
INPUTS
GND
VOH
tPHL
tPLH
nY OUTPUT
VM
VOL
SV00641
Figure 1. Input (S, nl0, nl1) to output (nY) propagation delays.
VI
OE INPUT
GND
VCC
OUTPUT
LOW-to-OFF
OFF-to-LOW
VOL
VOH
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
VM
tPLZ
tPZL
VX
tPHZ
VY
outputs
enabled
VM
tPZH
outputs
disabled
VM
outputs
enabled
SV00642
Figure 2. 3-State enable and disable times.
1998 May 20
6
 

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