2003 Fairchild Semiconductor Corporation
DS500377
www.fairchildsemi.com
May 2000
Revised September 2003
NC7WB3306 T
i
nyLogi
c
UHS
2
-
Bit
Low
Power Bus
Swi
t
ch
NC7WB3306
TinyLogic
UHS 2-Bit Low Power Bus Switch
General Description
The NC7WB3306 is a 2-bit ultra high-speed CMOS FET
bus switch with TTL-compatible active LOW control inputs.
The low On Resistance of the switch allows inputs to be
connected to outputs with minimal propagation delay and
without generating additional ground bounce noise. The
device is organized as a 2-bit switch with independent bus
enable (OE) controls. When OE is LOW, the switch is ON
and Port A is connected to Port B. When OE is HIGH, the
switch is OPEN and a high-impedance state exists
between the two ports. Control inputs tolerate voltages up
to 5.5V independent of V
CC
.
Features
s
Space saving US8 surface mount package
s
MicroPak
leadless package
s
Typical 3
switch resistance at 5.0V V
CC
s
Minimal propagation delay through the switch
s
Power down high impedance input/output
s
Zero bounce in flow through mode.
s
TTL compatible active LOW control inputs
s
Control inputs are overvoltage tolerant
Ordering Code:
TinyLogic
is a registered trademark of Fairchild Semiconductor Corporation.
MicroPak
is a trademark of Fairchild Semiconductor Corporation.
Product
Package Description
Supplied As
Order
Package
Code
Number
Number Top Mark
NC7WB3306K8X MAB08A
WB06
8-Lead US8, JEDEC MO-187, Variation CA 3.1mm Wide 3k Units on Tape and Reel
NC7WB3306L8X MAC08A
U3
8-Lead MicroPak, 1.6 mm Wide
5k Units on Tape and Reel
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2
NC7W
B
3306
Logic Symbol
Pin Descriptions
Function Table
H
=
HIGH Logic Level
L
=
LOW Logic Level
Connection Diagrams
(Top View)
Pin One Orientation Diagram
AAA represents Product Code Top Mark - see ordering code
Note: Orientation of Top Mark determines Pin One location. Read the top
product code mark left to right, Pin One is the lower left pin (see diagram).
Pad Assignments for MicroPak
(Top Thru View)
Pin Name
Description
A
Bus A
B
Bus B
OE
Bus Enable Input
Bus Enable Input OE
Function
L
B Connected to A
H
Disconnected
3
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NC7WB3306
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
(Note 3)
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: The input and output negative voltage ratings may be exceeded if
the input and output diode current ratings are observed.
Note 3: Unused logic inputs must be held HIGH or LOW. They may not
float.
DC Electrical Characteristics
Note 4: Measured by the voltage drop between A and B pins at the indicated current through the switch. On Resistance is determined by the lower of the
voltages on the two (A or B) pins.
Note 5: Per TTL driven input (V
IN
=
3.4V, control input only). A and B pins do not contribute to I
CC.
Supply Voltage (V
CC
)
-
0.5V to
+
7.0V
DC Switch Voltage (VS)
-
0.5V to
+
7.0V
DC Output Voltage (V
IN
) (Note 2)
-
0.5V to
+
7.0V
DC Input Diode Current
(I
IK
) V
IN
<
0V
-
50 mA
DC Output (I
OUT
) Current
128 mA
DC V
CC
or Ground Current (I
CC
/GND)
100 mA
Storage Temperature Range (T
STG
)
-
65
C to
+
150
C
Junction Lead Temperature under Bias (T
J
)
+
150
C
Lead Temperature (T
L
)
(Soldering, 10 seconds)
+
260
C
Power Dissipation (P
D
) @
+
85
C
250 mW
Supply Operating (V
CC
)
4.0V to 5.5V
Control Input Voltage (V
IN
)
0V to 5.5V
Switch Input Voltage (V
IN
)
0V to 5.5V
Output Voltage (V
OUT
)
0V to 5.5V
Operating Temperature (T
A
)
-
40
C to
+
85
C
Input Rise and Fall Time (t
r
, t
f
)
Control Input
0 ns/V to 5 ns/V
Switch I/O
0 ns/V to DC
Thermal Resistance (
JA
)
250
C/W
Symbol
Parameter
V
CC
T
A
=
-
40
C to
+
85
C
Units
Conditions
(V)
Min
Typ
Max
V
IK
Clamp Diode Voltage
4.5
-
1.2
V
I
IN
=
-
18 mA
V
IH
HIGH Level Input Voltage
4.0 to 5.5
2.0
V
V
IL
LOW Level Input Voltage
4.0 to 5.5
0.8
V
V
OH
HIGH Level Output Voltage
4.5 to 5.5
see Figure 3
V
V
IN
=
V
CC
I
IN
Input Leakage Current
5.5
1.0
A
0
V
IN
5.5V
I
OFF
Switch OFF Leakage Current
5.5
1.0
A
0
A, B,
V
CC
R
ON
Switch On Resistance
4.5
3
7
V
IN
=
0V, I
IN
=
64 mA
(Note 4)
4.5
3
7
V
IN
=
0V, I
IN
=
30 mA
4.5
6
15
V
IN
=
2.4V, I
IN
=
15 mA
4.0
10
20
V
IN
=
2.4V, I
IN
=
15 mA
I
CC
Quiescent Supply Current
5.5
3
A
V
IN
=
V
CC
or GND,
I
OUT
=
0
I
CC
Increase in I
CC
per Input
5.5
1
2.5
mA
V
IN
=
3.4V, I
O
=
0,
(Note 5)
Control Input Only
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4
NC7W
B
3306
AC Electrical Characteristics
Note 6: This parameter is guaranteed. The bus switch contributes no propagation delay other than the RC delay of the typical On Resistance of the switch
and the 50 pF load capacitance, when driven by an ideal voltage source (zero output impedance). The specified limit is calculated on this basis.
Capacitance
AC Loading and Waveforms
Input driven by 50
source terminated in 50
.
C
L
includes load and stray capacitance.
Input PRR
=
1.0 MHz t
w
=
500 ns.
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
T
A
=
-
40
C to
+
85
C
Symbol
Parameter
V
CC
C
L
=
50 pF, RU
=
RD
=
500
Units
Conditions
Figure
(V)
Min
Typ
Max
Number
t
PHL
,
Propagation Delay Bus-to-Bus
4.0 to 5.5
0.25
ns
V
I
=
OPEN
Figures
1, 2
t
PLH
(Note 6)
t
PZL
,
Output Enable Time
4.5 to 5.5
0.8
2.5
4.2
ns
V
I
=
7V for t
PZL
Figures
1, 2
t
PZH
4.0
0.8
3.0
4.6
V
I
=
0V for t
PZH
t
PLZ
,
Output Disable Time
4.5 to 5.5
0.8
3.1
4.8
ns
V
I
=
7V for t
PLZ
Figures
1, 2
t
PHZ
4.0
0.8
2.9
4.4
V
I
=
0V for t
PHZ
Symbol
Parameter
Typ
Max
Units
Conditions
C
IN
Control Pin Input Capacitance
2.5
pF
V
CC
=
0V
C
I/O
(OFF)
Port OFF Capacitance
6
pF
V
CC
=
5.0V
=
OE
C
I/O
(ON)
Switch ON Capacitance
12
pF
V
CC
=
5.0V, OE
=
0V
5
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NC7WB3306
DC Characteristics
FIGURE 3. Typical High Level Output Voltage vs. Supply Voltage
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6
NC7W
B
3306
Tape and Reel Specification
TAPE FORMAT for US8
TAPE DIMENSIONS inches (millimeters)
TAPE FORMAT for MicroPak
TAPE DIMENSIONS inches (millimeters)
Package
Tape
Number
Cavity
Cover Tape
Designator
Section
Cavities
Status
Status
Leader (Start End)
125 (typ)
Empty
Sealed
K8X
Carrier
250
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
Package
Tape
Number
Cavity
Cover Tape
Designator
Section
Cavities
Status
Status
Leader (Start End)
125 (typ)
Empty
Sealed
L8X
Carrier
250
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
7
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NC7WB3306
Tape and Reel Specification
(Continued)
REEL DIMENSIONS inches (millimeters)
Tape
Size
A
B
C
D
N
W1
W2
W3
8 mm
7.0
0.059
0.512
0.795
2.165
0.331
+
0.059/
-
0.000
0.567
W1
+
0.078/
-
0.039
(177.8)
(1.50)
(13.00)
(20.20)
(55.00)
(8.40
+
1.50/
-
0.00)
(14.40)
(W1
+
2.00/
-
1.00)
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8
NC7W
B
3306
Physical Dimensions
inches (millimeters) unless otherwise noted
8-Lead US8, JEDEC MO-187, Variation CA 3.1mm Wide
Package Number MAB08A
9
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NC7WB3306 T
i
nyLogi
c
UHS
2
-
Bit
Low
Power Bus
Swi
t
ch
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
8-Lead MicroPak, 1.6 mm Wide
Package Number MAC08A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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