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NC7SZ384 1-Bit Low Power Bus Switch
November 1996
Revised December 2005
NC7SZ384
1-Bit Low Power Bus Switch
General Description
The NC7SZ384 provides 1-bit of ultra high-speed CMOS TTL-
compatible bus switch. The low On Resistance of the switch
allows inputs to be connected to outputs with minimal propaga-
tion delay and without generating additional ground bounce
noise. The device is organized as a 1-bit switch with a bus
enable (OE) signal. 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.
Features
O
Space saving SOT23 or SC70 5-lead package
O
Ultra small MicroPak
¥
leadless package
O
5
:
switch connection between two ports
O
Minimal propagation delay through the switch
O
Low I
CC
O
Zero bounce in flow-through mode
O
Control inputs compatible with TTL level
Ordering Code:
Order
Number
NC7SZ384M5X
NC7SZ384P5X
NC7SZ384L6X
Package
Number
MA05B
MAA05A
MAC06A
Product Code
Top Mark
8Z84
Z84
C3
Package Description
5-Lead SOT23, JEDEC MO-178, 1.6mm
Pb-Free 6-Lead MicroPak, 1.0mm Wide
Supplied As
3k Units on Tape and Reel
5k Units on Tape and Reel
5-Lead SC70, EIAJ SC-88a, 1.25mm Wide 3k Units on Tape and Reel
Pb-Free package per JEDEC J-STD-020B.
Logic Diagram
Connection Diagrams
Pin Assignments for SOT23 and SC70
Pin Description
Pin Name
OE
A
B
NC
Description
Bus Switch Enable
Bus A
Bus B
No Connect
(Top View)
Pad Assignments for MicroPak
Truth Table
OE
L
H
B
O
A
O
HIGH-Z State
Function
Connect
Disconnect
(Top Through View)
MicroPak
¥
is a trademark of Fairchild Semiconductor Corporation.
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 lim-
its. The parametric values defined in the Electrical Characteristics tables are not
guaranteed at the absolute maximum ratings. The “Recommended Operating Condi-
tions” 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 inputs must be held HIGH or LOW. They may not float.
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” 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
3
6
10
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
10.0
7
7
15
20
10
2.5
V
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
O
0
V
IN
3.4V, I
O
0V, I
IN
0V, I
IN
2.4V, I
IN
2.4V, I
IN
0
d
A, B
d
V
CC
64 mA
30 mA
15 mA
15 mA
V
CC
or GND
0, Control Input only
'
I
CC
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
.
www.fairchildsemi.com
2
NC7SZ384
AC Electrical Characteristics
T
A
Symbol
Parameter
V
CC
(V)
t
PHL
,
t
PLH
t
PZL
,
t
PZH
t
PLZ
,
t
PHZ
Note 6:
All typical values are V
CC
5.0V, T
A
25
q
C.
Output Disable Time
Propagation Delay Bus to Bus
(Note 7)
Output Enable Time
4.5–5.5
4.0
4.5–5.5
4.0
1.0
1.0
1.0
1.0
2.5
2.5
5.0
5.5
5.0
5.5
ns
ns
ns
ns
V
I
V
I
V
I
V
I
7V for t
PZL
OPEN for t
PZH
7V for t
PLZ
OPEN for t
PHZ
4.0–5.5
C
L
Min
40
q
C to
85
q
C,
RD
Typ
(Note 6)
50 pF, RU
500
:
Max
0.25
Units
Conditions
Figure
Number
ns
V
I
OPEN
Figures
1, 2
Figures
1, 2
Figures
1, 2
Note 7:
This parameter is guaranteed by design but is not tested. 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).
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Microcontroller MCU
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