參數(shù)資料
型號： 74HCU
廠商： NXP Semiconductors N.V.
英文描述： HCMOS family characteristics
中文描述： HCMOS家庭特征
文件頁數(shù)： 14/19頁
文件大?。?/td> 88K
代理商： 74HCU
March 1988
14
Philips Semiconductors
HCMOS family characteristics
FAMILY SPECIFICATIONS
AC waveforms 74HCT (continued)
Test circuit for 74HCT
Fig.11 Propagation delays of 3-state outputs.
handbook, full pagewidth
MGK566
tPLZ
tPHZ
outputs
disabled
outputs
enabled
90%
10%
10%
90%
1.3 V
outputs
enabled
OUTPUT
LOW-to-OFF
OFF-to-LOW
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
OUTPUT
ENABLE
tPZL
tf
tr
tPZH
1.3 V
1.3 V
Switch position
Note
1.
For open-drain N-channel outputs t
PLZ
and t
PZL
are applicable.
TEST
SWITCH
t
PZH
t
PZL
t
PHZ
t
PLZ
GND
V
CC
GND
V
CC
Fig.12 Test circuit for 3-state outputs.
C
L
=
load capacitance including jig and probe capacitance
(see AC CHARACTERISTICS for values).
R
T
=
termination resistance should be equal to the output impedance Z
o
of
the pulse generator.
handbook, full pagewidth
MGK563
D.U.T
VCC
VCC
VI
VO
RT
RL = 1 k
CL
50 pF
PULSE
GENERATOR
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