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 Through View)
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2
NC7SB3257
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Switch Voltage (V
S
)
DC Output Voltage (V
IN
) (Note 3)
DC Input Diode Current (I
IK
)
@ (I
IK
) V
IN
0V
DC Output Current (I
OUT
)
DC V
CC
or Ground Current (I
CC
/I
GND
)
Storage Temperature Range (T
STG
)
Junction Lead Temperature under Bias (T
J
)
Lead Temperature (T
L
)
Power Dissipation (P
D
) @
85
q
C
(Soldering, 10 seconds)
0.5V to
7.0V
0.5V to
7.0V
0.5V to
7.0V
50 mA
r
100 mA
65
q
C to
150
q
C
150
q
C
260
q
C
180 mW
128 mA
Recommended Operating
Conditions
(Note 2)
Supply Voltage Operating (V
CC
)
Control Input Voltage (V
IN
)
Switch Input Voltage (V
IN
)
Output Voltage (V
OUT
)
Operating Temperature (T
A
)
Input Rise and Fall Time (t
r
, t
f
)
Thermal Resistance (
T
JA
)
Control Input V
CC
4.0V to 5.5V
0 ns/V to 5 ns/V
350
q
C/W
4.0V to 5.5V
0V to V
CC
0V to V
CC
0V to V
CC
40
q
C to
85
q
C
Note 1:
Absolute maximum ratings are DC values beyond which the device may be
damaged or have its useful life impaired. The datasheet specifications should be met,
without exception, to ensure that the system design is reliable over its power supply,
temperature, and output/input loading variables. Fairchild does not recommend oper-
ation outside datasheet specifications.
Note 2:
Control input must be held HIGH or LOW, it must not float.
Note 3:
The input and output negative voltage ratings may be exceeded if the input
and output diode current ratings are observed.
DC Electrical Characteristics
Symbol
V
IK
V
IH
V
IL
I
IN
I
OFF
R
ON
Parameter
Clamp Diode Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
OFF State Leakage Current
Switch On Resistance (Note 4)
V
CC
(V)
4.5
4.5
5.5
4.5
5.5
5.5
5.5
4.5
4.5
4.5
4.0
I
CC
Quiescent Supply Current
Increase in I
CC
Per Input (Note 5)
5.5
5.5
0.9
3.0
3.0
6.0
10.0
2.0
0.8
Min
T
A
40
q
C to
85
q
C
Typ
Max
Units
Conditions
I
IN
1.2
r
1.0
r
1.0
7.0
7.0
15.0
20.0
10.0
2.5
V
V
18 mA
P
A
P
A
:
:
:
:
P
A
mA
0
d
V
IN
d
5.5V
V
IN
V
IN
V
IN
V
IN
V
IN
I
OUT
V
IN
0V, I
IN
0V, I
IN
2.4V, I
IN
2.4V, I
IN
0
3.4V, I
O
0
d
A, B
d
V
CC
64 mA
30 mA
15 mA
15 mA
V
CC
or GND
0
'
I
CC
Control Input Only
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 Ports).
Note 5:
Per TTL driven Input (V
IN
3.4V, Control input only). A and B pins do not contribute to I
CC
.
3
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NC7SB3257
AC Electrical Characteristics
T
A
Symbol
Parameter
V
CC
(V)
t
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
t
B-M
Break Before Make Time
(Note 7)
Output Disable Time
Propagation Delay Bus to Bus
(Note 6)
Output Enable Time
4.5
5.5
4.0
4.5
5.5
4.0
4.5
5.5
4.0
1.8
1.8
0.8
0.8
0.5
0.5
6.5
7.3
4.7
5.3
ns
ns
V
I
V
I
V
I
V
I
7V for t
PZL
0V for t
PZH
7V for t
PLZ
0V for t
PHZ
4.0
55
C
L
Min
40
q
C to
85
q
C
Typ
50 pF, RU
RD 500
:
Max
0.25
Units
Conditions
Figure
Number
ns
V
I
OPEN
Figures
1, 2
Figures
1, 2
Figures
1, 2
Figure 3
Note 6:
This parameter is guaranteed by design but not tested. The bus switch contributes no propagation delay other than the RC delay of the On Resistance of the switch and
the 50 pF load capacitance, when driven by an ideal voltage source (zero output impedance).
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