2000 Fairchild Semiconductor Corporation
DS500325
www.fairchildsemi.com
January 2000
Revised June 2000
NC7SB3257
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NC7SB3257
TinyLogic
UHS Single 2-to-1
Multiplexer/Demultiplexer Bus Switch
General Description
The NC7SB3257 is a high performance, 2-to-1 NMOS
passgate multiplexer/demultiplexer from Fairchild's Ultra
High Speed Series of TinyLogic
. The device is fabricated
with advanced sub-micron CMOS technology to achieve
high speed enable and disable times and low on resis-
tance. The device is specified to operate over the 4.0 to
5.5V V
CC
operating range. The control input tolerates volt-
ages up to 5.5V independent of the V
CC
operating range.
Features
s
Space saving SC70 6-lead surface mount package
s
Typical 3
switch resistance @ 5.0V V
CC
s
Minimal propagation delay through the switch
s
Power down high impedance control input
s
Zero bounce in flow through mode
s
TTL compatible control input
s
Overvoltage tolerance of control input to 7.0V
s
Break before make enable circuitry
Ordering Code:
Logic Symbol
Pin Descriptions
Function Table
H
=
HIGH Logic Level
L
=
LOW Logic Level
Connection Diagram
(Top View)
Pin One Orientation Diagram
AAA
=
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).
TinyLogic
is a trademark of Fairchild Semiconductor Corporation.
Order
Number
Package
Number
Product Code
Top Mark
Package Description
Supplied As
NC7SB3257P6X
MAA06A
B7B
6-Lead SC70, EIAJ SC88, 1.25mm Wide
3k Units on Tape and Reel
Pin Names
Description
A, B
0
, B
1
Data Ports
SEL
Control Input
Input (SEL)
Function
L
B
0
Connected to A
H
B
1
Connected to A
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2
NC7SB3257
Absolute Maximum Ratings
(Note 1)
Recommended Operating
Conditions
(Note 2)
Note 1: Absolute maximum ratings are DC values beyond which the device
may be damaged or have its useful life impaired. The datasheet specifica-
tions should be met, without exception, to ensure that the system design is
reliable over its power supply, temperature, and output/input loading vari-
ables. Fairchild does not recommend operation outside datasheet specifi-
cations.
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
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 volt-
ages 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
.
Supply Voltage (V
CC
)
-
0.5V to
+
7.0V
DC Switch Voltage (V
S
)
-
0.5V to
+
7.0V
DC Output Voltage (V
IN
)
-
0.5V to
+
7.0V
DC Input Diode Current (I
IK
)
@ (I
IK
) V
IN
<
0V
-
50 mA
DC Output Current (I
OUT
)
128 mA
DC V
CC
or Ground Current (I
CC
/I
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
180 mW
Supply Voltage Operating (V
CC
)
4.0V to 5.5V
Control Input Voltage (V
IN
)
0V to V
CC
Switch Input Voltage (V
IN
)
0V to V
CC
Output Voltage (V
OUT
)
0V to V
CC
Operating Temperature (T
A
)
-
40
C to
+
85
C
Input Rise and Fall Time (t
r
, t
f
)
Control Input V
CC
=
4.0V to 5.5V
0 ns/V to 5 ns/V
Thermal Resistance (
JA
)
350
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
4.5
-
5.5
2.0
V
V
IL
LOW Level Input Voltage
4.5
-
5.5
0.8
I
IN
Input Leakage Current
5.5
1
A
0
V
IN
5.5V
I
OFF
OFF State Leakage Current
5.5
1
A
0
A, B
V
CC
R
ON
Switch ON Resistance (Note 4)
4.5
3
7
V
IN
=
0V, I
IN
=
64 mA
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
10
A
V
IN
=
V
CC
or GND
I
OUT
=
0
I
CC
Increase in I
CC
Per Input (Note 5)
5.5
0.9
2.5
mA
V
IN
=
3.4V, I
O
=
0
Control Input Only
3
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NC7SB3257
AC Electrical Characteristics
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).
Note 7: Guaranteed by design.
Capacitance
(Note 8)
Note 8: Capacitance is characterized but not tested.
Symbol
Parameter
T
A
=
-
40
C to
+
85
C
Units
Conditions
Fig. No.
V
CC
C
L
=
50 pF, RU
=
RD
=
500
(V)
Min
Typ
Max
t
PHL
Propagation Delay Bus to Bus
4.0
-
55
0.25
ns
V
I
=
OPEN
Figures 1,
2
t
PLH
(Note 6)
t
PZL
Output Enable Time
4.5
-
5.5
1.8
6.5
ns
V
I
=
7V for t
PZL
Figures 1,
2
t
PZH
4.0
1.8
7.3
V
I
=
0V for t
PZH
t
PLZ
Output Disable Time
4.5
-
5.5
0.8
4.7
V
I
=
7V for t
PLZ
Figures 1,
2
t
PHZ
4.0
0.8
5.3
V
I
=
0V for t
PHZ
t
B-M
Break Before Make Time
4.5
-
5.5
0.5
ns
Figure 3
(Note 7)
4.0
0.5
Symbol
Parameter
Typ
Max
Units
Conditions
C
IN
Control Pin Input Capacitance
2.3
pF
V
CC
=
0V
C
IO-B
B Port OFF Capacitance
5.7
pF
V
CC
=
5.0V
CIO-A
A Port ON Capacitance
16
pF
V
CC
=
5.0V
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4
NC7SB3257
AC Loading and Waveforms
Note: Input Driven by 50
source terminated in 50
Note: C
L
includes load and stray capacitance
Note: Input PRR
=
1.0 MHz; t
W
=
500 ns
FIGURE 1. AC Test Circuit
Input
=
AC Waveform;
PRR
=
Variable; Duty Cycle
=
50%
FIGURE 2. AC Waveforms
FIGURE 3. Break Before Make Interval Timing
5
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NC7SB3257
Tape and Reel Specification
TAPE FORMAT
TAPE DIMENSIONS inches (millimeters)
Package
Tape
Number
Cavity
Cover Tape
Designator
Section
Cavities
Status
Status
Leader (Start End)
125 (typ)
Empty
Sealed
P6X
Carrier
3000
Filled
Sealed
Trailer (Hub End)
75 (typ)
Empty
Sealed
Package
Tape Size
DIM A
DIM B
DIM F
DIM K
o
DIM P1
DIM W
SC70-6
8 mm
0.093
0.096
0.138
0.004 0.053
0.004
0.157
0.315
0.004
(2.35)
(2.45)
(3.5
0.10)
(1.35
0.10)
(4)
(8
0.1)
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6
NC7SB3257
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)
7
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NC7SB3257
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Physical Dimensions
inches (millimeters) unless otherwise noted
6-Lead SC70, EIAJ SC88, 1.25mm Wide
Package Number MAA06A
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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