參數(shù)資料
型號: HD74LVC244AFPEL-E
元件分類: 總線收發(fā)器
英文描述: LVC/LCX/Z SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20
封裝: SOP-20
文件頁數(shù): 5/7頁
文件大?。?/td> 189K
代理商: HD74LVC244AFPEL-E
HD74LVC244A
Rev.4.00 Jul. 27, 2004 page 5 of 6
Waveforms – 1
t
PLH
t
PHL
V
OH
V
OL
Input A
10 %
GND
90 %
V
ref
t
r
t
f
90 %
10 %
Output Y
V
IH
V
ref
V
ref
V
ref
Notes:
1.
2.
t
r
= 2.5 ns, t
f
= 2.5 ns
Input waveform : PRR = 10 MHz, duty cycle 50%
Waveforms – 2
V – 0.3 V
V + 0.3 V
t
ZL
t
LZ
t
ZH
t
HZ
t
f
t
r
90 %
10 %
90 %
V
ref
10 %
V
OH
V
OL
GND
Input G
Waveform - A
Waveform - B
V
ref
V
ref
V
ref
V
IH
V
OL1
V
OH1
TEST
V
IH
V
ref
V
OH1
V
OL1
1.5 V
3 V
GND
50%Vcc
Vcc
GND
2.7 V
Vcc
Vcc=2.7V,
3.3±0.3V
Vcc=5.0±0.5V
Notes:
1.
2.
3.
t
r
= 2.5 ns, t
f
= 2.5 ns
Input waveform : PRR = 10 MHz, duty cycle 50%
Waveform – A shows input conditions such that the output is "L" level when enable by the
output control.
Waveform – B shows input conditions such that the output is "H" level when enable by the
output control.
4.
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