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 determines
the direction of data flow through the bidirectional trans-
ceiver. 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
n
Ideal for low power/low noise 3.3V applications
n
Implements patented EMI reduction circuitry
n
Available in SOIC JEDEC, SOIC EIAJ and QSOP
packages
n
Guaranteed simultaneous switching noise level and
dynamic threshold performance
n
Improved latch-up immunity
n
Guaranteed incident wave switching into 75
n
4 kV minimum ESD immunity
Ordering Code
Order Number
Package Number
Package Description
74LVQ245SC
M20B
20-Lead (0.300" Wide) Small Outline Package, SOIC JEDEC
74LVQ245SJ
M20D
20-Lead Molded Shrink Small Outline Package, SOIC EIAJ
74LVQ245QSC
MQA20
20-Lead (0.150" Wide) Molded Shrink Small Outline Package, SSOP JEDEC
Devices also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbols
Connection Diagram
DS011357-1
IEEE/IEC
DS011357-2
Pin Assignment for
SOIC and QSOP
DS011357-3
May 1998
74L
VQ245
Low
V
oltage
Octal
Bidirectional
T
ransceiver
with
3-ST
A
T
E
Outputs
1998 Fairchild Semiconductor Corporation
DS011357
www.fairchildsemi.com
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
-0.5V to +7.0V
DC Input Diode Current (I
IK
)
V
I
= -0.5V
-20 mA
V
I
= V
CC
+ 0.5V
+20 mA
DC Input Voltage (V
I
)
-0.5V to V
CC
+ 0.5V
DC Output Diode Current (I
OK
)
V
O
= -0.5V
-20 mA
V
O
= V
CC
+ 0.5V
+20 mA
DC Output Voltage (V
O
)
-0.5V to V
CC
+ 0.5V
DC Output Source
or Sink Current (I
O
)
50 mA
DC V
CC
or Ground Current
(I
CC
or I
GND
)
400 mA
Storage Temperature (T
STG
)
-65C to +150C
DC Latch-Up Source or
Sink Current
300 mA
Recommended Operating
Conditions
(Note 2)
Supply Voltage (V
CC
)
2.0V to 3.6V
Input Voltage (V
I
)
0V to V
CC
Output Voltage (V
O
)
0V to V
CC
Operating Temperature (T
A
)
-40C to +85C
Minimum Input Edge Rate (
V/
t)
V
IN
from 0.8V to 2.0V
V
CC
@
3.0V
125 mV/ ns
Note 1: The "Absolute Maximum Ratings" are those values beyond which
the safety of the device cannot be guaranteed. The device should not be op-
erated at these limits. The parametric values defined in the Electrical Charac-
teristics tables are not guaranteed at the absolute maximum ratings. The
"Recommended Operating Conditions" table will define the conditions for ac-
tual device operation.
Note 2: Unused inputs must be held HIGH or LOW. They may not float.
DC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
T
A
= +25C
T
A
= -40C to +85C
Units
Conditions
Typ
Guaranteed Limits
V
IH
Minimum High Level
Input Voltage
3.0
1.5
2.0
2.0
V
V
OUT
= 0.1V
or V
CC
- 0.1V
V
IL
Maximum Low Level
Input Voltage
3.0
1.5
0.8
0.8
V
V
OUT
= 0.1V
or V
CC
- 0.1V
V
OH
Minimum High Level
Output Voltage
3.0
2.99
2.9
2.9
V
I
OUT
= -50 A
3.0
2.58
2.48
V
V
IN
= V
IL
or V
IH
(Note 3)
I
OH
= -12 mA
V
OL
Maximum Low Level
Output Voltage
3.0
0.002
0.1
0.1
V
I
OUT
= 50 A
3.0
0.36
0.44
V
V
IN
= V
IL
or V
IH
(Note 3)
I
OL
= +12 mA
I
IN
Maximum Input
Leakage Current
3.6
0.1
1.0
A
V
I
= V
CC
, GND
I
OLD
Minimum Dynamic
Output Current (Note 4)
3.6
36
mA
V
OLD
= 0.8V Max (Note 5)
I
OHD
3.6
-25
mA
V
OHD
= 2.0V Min (Note 5)
I
CC
Maximum Quiescent
Supply Current
3.6
4.0
40.0
A
V
IN
= V
CC
or GND
I
OZT
Maximum I/O
Leakage Current
3.6
0.3
3.0
A
V
I
(OE) = V
IL
, V
IH
V
I
= V
CC
, GND
V
O
= V
CC
, GND
V
OLP
Quiet Output
Maximum Dynamic V
OL
3.3
0.5
0.8
V
(Notes 6, 7)
V
OLV
Quiet Output
Minimum Dynamic V
OL
3.3
-0.5
-0.8
V
(Notes 6, 7)
V
IHD
Maximum High Level
Dynamic Input Voltage
3.3
1.6
2.0
V
(Notes 6, 8)
V
ILD
Maximum Low Level
Dynamic Input Voltage
3.3
1.7
0.8
V
(Notes 6, 8)
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 75
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.
3
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AC Electrical Characteristics
Symbol
Parameter
V
CC
(V)
T
A
= +25C
C
L
= 50 pF
T
A
= -40C to +85C
C
L
= 50 pF
Units
Min
Typ
Max
Min
Max
t
PHL
Propagation Delay
2.7
2.0
9.0
14.0
2.0
15.0
ns
t
PLH
3.3
0.3
2.0
7.5
10.0
2.0
10.5
t
PZL
Output Enable Time
2.7
3.0
10.2
18.3
3.0
19.0
ns
t
PZH
3.3
0.3
3.0
8.5
13.0
3.0
13.5
t
PHZ
Output Disable Time
2.7
1.0
10.2
20.4
1.0
21.0
ns
t
PLZ
3.3
0.3
1.0
8.5
14.5
1.0
15.0
t
OSHL
Output to Output
2.7
1.0
1.5
1.5
ns
t
OSLH
Skew (Note 9)
3.3
0.3
1.0
1.5
1.5
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 speci-
fication applies to any outputs switching in the same direction, either HIGH to LOW (t
OSHL
) or LOW to HIGH (t
OSLH
). Parameterguaranteed by design.
Capacitance
Symbol
Parameter
Typ
Units
Conditions
C
IN
Input Capacitance
4.5
pF
V
CC
= Open
C
I/O
Input/Output Capacitance
15
pF
V
CC
= 3.3V
C
PD
(Note 10)
Power Dissipation Capacitance
67
pF
V
CC
= 3.3V
Note 10: C
PD
is measured at 10 MHz.
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4
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead (0.300" Wide) Small Outline Package, SOIC JEDEC
Package Number M20B
20-Lead Molded Shrink Small Outline Package, SOIC EIAJ
Package Number M20D
5
www.fairchildsemi.com
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