參數(shù)資料
型號(hào): 74LVC257APWDH
廠商: NXP SEMICONDUCTORS
元件分類: 通用總線功能
英文描述: Quad 2-input multiplexer with 5 Volt tolerant inputs/outputs 3-State
中文描述: LVC/LCX/Z SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16
封裝: PLASTIC, TSSOP-16
文件頁(yè)數(shù): 6/10頁(yè)
文件大?。?/td> 97K
代理商: 74LVC257APWDH
Philips Semiconductors
Product specification
74LVC257A
Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)
1998 Jul 29
6
AC WAVEFORMS
V
M
= 0.5
×
V
CC
at V
CC
<
2.7 V
V
M
= 1.5 V at V
CC
2.7 V
V
X
= V
OL
+ 0.3 V at V
CC
2.7 V
V
X
= V
OL
+ 0.1
×
V
CC
at V
CC
<
2.7 V
V
Y
= V
OH
– 0.3 V at V
CC
2.7V
V
Y
= V
OH
– 0.1
×
V
CC
at V
CC
<
2.7 V
V
OL
and V
OH
are the typical output voltage drop that occur with the
output load.
SV00641
V
M
S, nI
, nI
1
INPUTS
nY OUTPUT
V
M
t
PLH
t
PHL
GND
V
CC
V
OL
V
OH
Figure 1. Input (S, nl
0
, nl
1
) to output (nY) propagation delays.
SV00642
outputs
disabled
outputs
enabled
outputs
enabled
t
PHZ
t
PZH
t
PZL
t
PLZ
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
OUTPUT
LOW-to-OFF
OFF-to-LOW
V
M
V
M
OE INPUT
V
X
V
OL
V
OH
V
Y
GND
GND
V
CC
V
I
V
M
Figure 2. 3-state enable and disable times.
TEST CIRCUIT
PULSE
GENERATOR
V
I
R
T
D.U.T.
V
O
C
L
50pF
S
1
2 x V
CC
Open
GND
500
500
V
CC
V
I
2.7V
V
CC
2.7V
2.7V – 3.6V
Test
S
1
GND
t
PLZ
/t
PZL
t
PHZ
/t
PZH
2 x V
CC
t
PLH
/t
PHL
Open
SY00003
V
CC
Figure 3. Load circuitry for switching times.
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