74LVQ245 Low Voltage Octal Bidirectional Transceiver with 3-STATE Outputs
February 1992
Revised June 2001
74LVQ245
Low Voltage Octal Bidirectional Transceiver
with 3-STATE Outputs
General Description
The LVQ245 contains eight non-inverting bidirectional buff-
ers with 3-STATE outputs and is intended for bus-oriented
applications. Current sinking capability is 12 mA at both the
A and B ports. The Transmit/Receive (T/R) input deter-
mines the direction of data flow through the bidirectional
transceiver. Transmit (active-HIGH) enables data from A
ports to B ports; Receive (active-LOW) enables data from
B ports to A ports. The Output Enable input, when HIGH,
disables both A and B ports by placing them in a HIGH Z
condition.
Features
s
Ideal for low power/low noise 3.3V applications
s
Implements patented EMI reduction circuitry
s
Available in SOIC JEDEC, SOIC EIAJ and QSOP
packages
s
Guaranteed simultaneous switching noise level and
dynamic threshold performance
s
Improved latch-up immunity
s
Guaranteed incident wave switching into 75
Ω
s
4 kV minimum ESD immunity
Ordering Code
Order Number
74LVQ245SC
74LVQ245SJ
74LVQ245QSC
Package Number
M20B
M20D
MQA20
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Quarter Size Outline Package (QSOP), JEDEC MO-137, 0.150" Wide
Devices also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbols
Connection Diagram
IEEE/IEC
Pin Descriptions
Pin Names
Description
Output Enable Inputs
Transmit/Receive Input
Side A Inputs or
3-STATE Outputs
B
0
–B
7
Side B Inputs or
3-STATE Outputs
Truth Table
Inputs
Outputs
OE
L
L
H
H
=
HIGH Voltage Level
OE
T/R
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
HIGH-Z State
X
=
Immaterial
A
0
–A
7
L
=
LOW Voltage Level
© 2001 Fairchild Semiconductor Corporation
DS011357
www.fairchildsemi.com
74LVQ245
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Input Diode Current (I
IK
)
V
I
= −
0.5V
V
I
=
V
CC
+
0.5V
DC Input Voltage (V
I
)
DC Output Diode Current (I
OK
)
V
O
= −
0.5V
V
O
=
V
CC
+
0.5V
DC Output Voltage (V
O
)
DC Output Source
or Sink Current (I
O
)
DC V
CC
or Ground Current
(I
CC
or I
GND
)
Storage Temperature (T
STG
)
DC Latch-Up Source or
Sink Current
−
0.5V to
+
7.0V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
−
20 mA
+
20 mA
−
0.5V to V
CC
+
0.5V
±
50 mA
±
400 mA
−
65
°
C to
+
150
°
C
±
300 mA
Recommended Operating
Conditions
(Note 2)
Supply Voltage (V
CC
)
Input Voltage (V
I
)
Output Voltage (V
O
)
Operating Temperature (T
A
)
Minimum Input Edge Rate (
∆
V/
∆
t)
V
IN
from 0.8V to 2.0V
V
CC
@ 3.0V
125 mV/ns
2.0V to 3.6V
0V to V
CC
0V to V
CC
−
40
°
C to
+
85
°
C
Note 1:
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 “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Note 2:
Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
OH
Parameter
Minimum High Level
Input Voltage
Maximum Low Level
Input Voltage
Minimum High Level
Output Voltage
V
OL
Maximum Low Level
Output Voltage
I
IN
I
OLD
I
OHD
I
CC
Maximum Input Leakage Current
Minimum Dynamic
Output Current (Note 4)
Maximum Quiescent
Supply Current
I
OZT
Maximum I/O
Leakage Current
V
OLP
V
OLV
V
IHD
V
ILD
Quiet Output
Maximum Dynamic V
OL
Quiet Output
Minimum Dynamic V
OL
Maximum High Level
Dynamic Input Voltage
Maximum Low Level
Dynamic Input Voltage
3.6
±0.3
±3.0
µA
V
CC
(V)
3.0
3.0
3.0
3.0
3.0
3.0
3.6
3.6
3.6
3.6
4.0
0.002
T
A
= +25°C
Typ
1.5
1.5
2.99
2.0
0.8
2.9
2.58
0.1
0.36
±0.1
T
A
= −40°C
to
+85°C
Guaranteed Limits
2.0
0.8
2.9
2.48
0.1
0.44
±1.0
36
−25
40.0
V
V
V
V
V
V
µA
mA
mA
µA
V
OUT
=
0.1V
or V
CC
−
0.1V
V
OUT
=
0.1V
or V
CC
−
0.1V
I
OUT
= −50 µA
V
IN
=
V
IL
or V
IH
(Note 3)
I
OH
= −12
mA
I
OUT
=
50
µA
V
IN
=
V
IL
or V
IH
(Note 3)
I
OL
= +12
mA
V
I
=
V
CC
, GND
V
OLD
=
0.8V Max (Note 5)
V
OHD
=
2.0V Min (Note 5)
V
IN
=
V
CC
or GND
V
I
(OE)
=
V
IL
, V
IH
V
I
=
V
CC
, GND
V
O
=
V
CC
, GND
3.3
3.3
3.3
3.3
0.5
−0.5
1.6
1.7
0.8
−0.8
2.0
0.8
V
V
V
V
(Note 6)(Note 7)
(Note 6)(Note 7)
(Note 6)(Note 8)
(Note 6)(Note 8)
Units
Conditions
Note 3:
All outputs loaded; thresholds on input associated with output under test.
Note 4:
Maximum test duration 2.0 ms, one output loaded at a time.
Note 5:
Incident wave switching on transmission lines with impedances as low as 75Ω for commercial temperature range is guaranteed for 74LVQ.
Note 6:
Worst case package.
Note 7:
Max number of outputs defined as (n). Data inputs are driven 0V to 3.3V; one output at GND.
Note 8:
Max number of Data Inputs (n) switching. (n
−
1) inputs switching 0V to 3.3V. Input-under-test switching: 3.3V to threshold (V
ILD
), 0V to threshold
(V
IHD
), f
=
1 MHz.
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2
74LVQ245
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
V
CC
(V)
t
PHL
t
PLH
t
PZL
t
PZH
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Output to Output
Skew (Note 9)
Output Disable Time
Output Enable Time
Propagation Delay
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
2.7
3.3
±
0.3
Min
2.0
2.0
3.0
3.0
1.0
1.0
C
L
=
50 pF
Typ
9.0
7.5
10.2
8.5
10.2
8.5
1.0
1.0
Max
14.0
10.0
18.3
13.0
20.4
14.5
1.5
1.5
T
A
= −40°C
to
+85°C
C
L
=
50 pF
Min
2.0
2.0
3.0
3.0
1.0
1.0
Max
15.0
10.5
19.0
13.5
21.0
15.0
1.5
1.5
ns
ns
ns
ns
Units
Note 9:
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
). Parameter guaranteed by design.
Capacitance
Symbol
C
IN
C
I/O
C
PD
(Note 10)
Parameter
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
Typ
4.5
15
67
Units
pF
pF
pF
V
CC
=
Open
V
CC
=
3.3V
V
CC
=
3.3V
Conditions
Note 10:
C
PD
is measured at 10 MHz.
3
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74LVQ245
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide
Package Number M20B
www.fairchildsemi.com
4
74LVQ245
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
Package Number M20D
5
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