Unused bus terminals during HIGH Z State must be held HIGH or LOW.
Outputs
T/R
L
H
X
Bus B
0
– B
7
Data to Bus A
0
– A
7
Bus A
0
– A
7
Data to Bus B
0
– B
7
HIGH Z State on A
0
– A
7
, B
0
– B
7
(Note 2)
Logic Diagram
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2
74LCX245
Absolute Maximum Ratings
(Note 3)
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Source/Sink Current
DC Supply Current per Supply Pin
DC Ground Current per Ground Pin
Storage Temperature
Value
−0.5
to
+7.0
−0.5
to
+7.0
−0.5
to
+7.0
−0.5
to V
CC
+
0.5
−50
−50
+50
±50
±100
±100
−65
to
+150
(Note 5)
Min
Operating
Data Retention
V
I
V
O
I
OH
/I
OL
Input Voltage
Output Voltage
Output Current
HIGH or LOW State
3-STATE
V
CC
=
3.0V
−
3.6V
V
CC
=
2.7V - 3.0V
V
CC
=
2.3V - 2.7V
T
A
∆t/∆V
Free-Air Operating Temperature
Input Edge Rate, V
IN
=
0.8V
−
2.0V, V
CC
=
3.0V
−40
0
2.0
1.5
0
0
0
Max
3.6
3.6
5.5
V
CC
5.5
±24
±12
±8
85
10
°C
ns/V
mA
Units
V
V
V
Output in 3-STATE
Output in HIGH or LOW State (Note 4)
V
I
<
GND
V
O
<
GND
V
O
>
V
CC
Conditions
Units
V
V
V
mA
mA
mA
mA
mA
°C
Recommended Operating Conditions
Symbol
V
CC
Supply Voltage
Parameter
Note 3:
The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated
at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the Absolute Maximum Ratings. The “Recom-
mended Operating Conditions” table will define the conditions for actual device operation.
Note 4:
I
O
Absolute Maximum Rating must be observed.
Note 5:
Unused inputs or I/O pins must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −8
mA
I
OH
= −12
mA
I
OH
= −18
mA
I
OH
= −24
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
8mA
I
OL
=
12 mA
I
OL
=
16 mA
I
OL
=
24 mA
I
I
I
OZ
I
OFF
Input Leakage Current
3-STATE I/O Leakage
Power-Off Leakage Current
0
≤
V
I
≤
5.5V
0
≤
V
O
≤
5.5V
V
I
=
V
IH
or V
IL
V
I
or V
O
=
5.5V
0
10
µA
Conditions
V
CC
(V)
2.3
−
2.7
2.7
−
3.6
2.3
−
2.7
2.7 - 3.6
2.3 - 3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
2.7
3.0
3.0
2.3
−
3.6
2.3
−
3.6
V
CC
−
0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5.0
±5.0
µA
µA
V
V
T
A
= −40°C
to
+85°C
Min
1.7
2.0
0.7
0.8
Max
V
V
Units
3
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74LCX245
DC Electrical Characteristics
Symbol
I
CC
∆I
CC
Parameter
Quiescent Supply Current
Increase in I
CC
per Input
(Continued)
V
CC
(V)
2.3
−
3.6
2.3
−
3.6
2.3 - 3.6
T
A
= −40°C
to
+85°C
Min
Max
10
±10
500
µA
µA
Conditions
V
I
=
V
CC
or GND
3.6V
≤
V
I
, V
O
≤
5.5V (Note 6)
V
IH
=
V
CC
−0.6V
Units
Note 6:
Outputs disabled or 3-STATE only.
AC Electrical Characteristics
T
A
= −40°C
to
+85°C,
R
L
=
500Ω
Symbol
Parameter
V
CC
=
3.3V
±
0.3V
C
L
=
50 pF
Min
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSHL
t
OSLH
Output to Output Skew
(Note 7)
Output Disable Time
Propagation Delay
A
n
to B
n
or B
n
to A
n
Output Enable Time
1.5
1.5
1.5
1.5
1.5
1.5
Max
7.0
7.0
8.5
8.5
7.5
7.5
1.0
1.0
Min
1.5
1.5
1.5
1.5
1.5
1.5
V
CC
=
2.7V
C
L
=
50 pF
Max
8.0
8.0
9.5
9.5
8.5
8.5
Min
1.5
1.5
1.5
1.5
1.5
1.5
V
CC
=
2.5V
±
0.2V
C
L
=
30 pF
Max
8.4
8.4
10.5
10.5
9.0
9.0
ns
ns
ns
ns
Units
Note 7:
Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
Dynamic Switching Characteristics
Symbol
V
OLP
V
OLV
Parameter
Quiet Output Dynamic Peak V
OL
Quiet Output Dynamic Valley V
OL
Conditions
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
C
L
=
50 pF, V
IH
=
3.3V, V
IL
=
0V
C
L
=
30 pF, V
IH
=
2.5V, V
IL
=
0V
V
CC
(V)
3.3
2.5
3.3
2.5
T
A
=
25°C
Typical
0.8
0.6
−0.8
−0.6
Units
V
V
Capacitance
Symbol
C
IN
C
I/O
C
PD
Parameter
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
Conditions
V
CC
=
Open, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
V
CC
=
3.3V, V
I
=
0V or V
CC
, f
=
10 MHz
Typical
7
8
25
Units
pF
pF
pF
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4
74LCX245
AC LOADING and WAVEFORMS
Generic for LCX Family
FIGURE 1. AC Test Circuit (C
L
includes probe and jig capacitance)
Test
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
,t
PHZ
Switch
Open
6V at V
CC
=
3.3
±
0.3V
V
CC
x 2 at V
CC
=
2.5
±
0.2V
GND
Waveform for Inverting and Non-Inverting Functions
模拟电子
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