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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)： | 17/19頁 |
| 文件大小： | 88K |
| 代理商： | 74HCU |
March 1988
17
Philips Semiconductors
HCMOS family characteristics
FAMILY SPECIFICATIONS
DEFINITIONS OF SYMBOLS AND TERMS USED IN
HCMOS DATA SHEETS
Currents
Positive current is defined as conventional current flow
into a device.
Negative current is defined as conventional current flow
out of a device.
Voltages
All voltages are referenced to GND (ground), which is
typically 0 V
.
I
CC
Quiescent power supply current; the current
flowing into the V
CC
supply terminal.
Additional quiescent supply current per input
pin at a specified input voltage and V
CC
.
Quiescent power supply current; the current
flowing into the GND terminal.
Input leakage current; the current flowing into a
device at a specified input voltage and V
CC
.
Input diode current; the current flowing into a
device at a specified input voltage.
Output source or sink current: the current
flowing into a device at a specified output
voltage.
Output diode current; the current flowing into a
device at a specified output voltage.
OFF-state output current; the leakage current
flowing into the output of a 3-state device in the
OFF-state, when the output is connected to
V
CC
or GND.
Analog switch leakage current; the current
flowing into an analog switch at a specified
voltage across the switch and V
CC
.
I
CC
I
GND
I
I
I
IK
I
O
I
OK
I
OZ
I
S
GND
Supply voltage; for a device with a single
negative power supply, the most negative
power supply, used as the reference level for
other voltages; typically ground.
Supply voltage; the most positive potential on
the device.
Supply voltage; one of two (GND and V
EE
)
negative power supplies.
Hysteresis voltage; difference between the
trigger levels, when applying a positive and a
negative-going input signal.
HIGH level input voltage; the range of input
voltages that represents a logic HIGH level in
the system.
V
CC
V
EE
V
H
V
IH
Analog terms
Capacitances
V
IL
LOW level input voltage; the range of input
voltages that represents a logic LOW level in
the system.
HIGH level output voltage; the range of
voltages at an output terminal with a specified
output loading and supply voltage. Device
inputs are conditioned to establish a HIGH level
at the output.
LOW level output voltage; the range of voltages
at an output terminal with a specified output
loading and supply voltage. Device inputs are
conditioned to establish a LOW level at the
output.
Trigger threshold voltage; positive-going signal.
Trigger threshold voltage; negative-going
signal.
V
OH
V
OL
V
T
+
V
T
R
ON
ON-resistance; the effective ON-state
resistance of an analog switch, at a specified
voltage across the switch and output load.
ON-resistance; the difference in
ON-resistance between any two switches of an
analog device at a specified voltage across the
switch and output load.
R
ON
C
I
Input capacitance; the capacitance measured
at a terminal connected to an input of a device.
Input/Output capacitance; the capacitance
measured at a terminal connected to an I/O-pin
(e.g. a transceiver).
Output load capacitance; the capacitance
connected to an output terminal including jig
and probe capacitance.
Power dissipation capacitance; the capacitance
used to determine the dynamic power
dissipation per logic function, when no extra
load is provided to the device.
Switch capacitance; the capacitance of a
terminal to a switch of an analog device.
C
I/O
C
L
C
PD
C
S
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