Fairchild NC7SZ384 service manual
NC7SZ384
1-Bit Low Power Bus Switch
NC7SZ384 1-Bit Low Power Bus Switch
November 1996
Revised December 2005
General Description
The NC7SZ384 provides 1-bit of ultra high-speed CMOS TTLcompatible bus switch. 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 1-bit switch with a bus
enable (OE
A is connected to Port B. When OE
and a high-impedance state exists between the two ports.
) signal. When OE is LOW, the switch is on and Port
is HIGH, the switch is open
Features
O
Space saving SOT23 or SC70 5-lead package
O
Ultra small MicroPak¥ leadless package
O5:
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 Package Product Code
Number Number Top Mark
NC7SZ384M5X MA05B 8Z84 5-Lead SOT23, JEDEC MO-178, 1.6mm 3k Units on Tape and Reel
NC7SZ384P5X MAA05A Z84 5-Lead SC70, EIAJ SC-88a, 1.25mm Wide 3k Units on Tape and Reel
NC7SZ384L6X MAC06A C3 Pb-Free 6-Lead MicroPak, 1.0mm Wide 5k Units on Tape and Reel
Pb-Free package per JEDEC J-STD-020B.
Logic Diagram
Package Description Supplied As
Connection Diagrams
Pin Assignments for SOT23 and SC70
Pin Description
Pin Name Description
OE Bus Switch Enable
ABus A
BBus B
NC No Connect
Pad Assignments for MicroPak
(Top View)
T ruth Table
OE
LAOConnect
H HIGH-Z State Disconnect
MicroPak¥ is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation DS012178 www.fairchildsemi.com
B
O
Function
(Top Through View)
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC)
NC7SZ384
DC Switch Voltage (V
DC Input Voltage (V
)
S
) (Note 2)
IN
DC Input Diode Current
) VIN 0V
(I
IK
DC Output (I
DC V
CC
(I
CC/IGND
) Sink Current 128 mA
OUT
/GND Current
)
Storage Temperature Range
)
(T
STG
Junction Temperature
under Bias (T
Junction Lead Temperature (T
)
J
)
L
(Soldering, 10 Seconds)
Power Dissipation (P
) @ 85qC
D
SOT23-5 200 mW
SC70-5 150 mW
DC Electrical Characteristics
0.5V to 7.0V
0.5V to 7.0V
0.5V to 7.0V
r
65q
C to 150qC
50 mA
100 mA
150qC
260qC
Recommended Operating
Conditions
Power Supply Operating (V
Input Voltage (V
Output Voltage (V
Input Rise and Fall Time (t
Switch Control Input 0 ns/V to 5 ns
Switch I/O 0 ns/V to DC
Operating Temperature (T
Thermal Resistance (
SOT23-5 300
SC70-5 425
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 inputs must be held HIGH or LOW. They may not float.
(Note 3)
) 4.0V to 5.5V
)0V to 5.5V
IN
OUT
CC
)0V to 5.5V
, tf)
r
)
A
T
)
JA
40q
C to 85qC
q
C/W
q
C/W
V
Symbol Parameter
V
IK
V
IH
V
IL
I
IN
I
OFF
R
ON
I
CC
'
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 (VIN 3.4V, control input only). A and B pins do not contribute to ICC.
Clamp Diode Voltage 4.5
HIGH Level Input Voltage 4.5–5.5 2.0 V
LOW Level Input Voltage 4.5–5.5 0.8 V
Input Leakage Current 5.5
“OFF” Leakage Current 5.5
Switch On Resistance 4.5 3 7
(Note 4) 4.5 3 7
Quiescent Supply Current 5.5 10
Increase in ICC per Input (Note 5) 5.5 0.9 2.5 mA VIN 3.4V, IO 0, Control Input only
CC
(V) Min Typ Max
4.5 6 15
4.0 10 20
TA 40qC to 85qC
r
r
1.2
1.0
10.0
Units Conditions
VIIN 18 mA
P
A0 d VIN d 5.5V
P
A0 d A, B d V
:
VIN 0V, IIN 64 mA
:
V
:
VIN 2.4V, IIN 15 mA
:
V
P
AVIN VCC or GND
IO
CC
0V, IIN 30 mA
IN
2.4V, IIN 15 mA
IN
0
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AC Electrical Characteristics
TA 40qC to 85qC,
Symbol Parameter
t
, Propagation Delay Bus to Bus 4.0–5.5 0.25 ns VI OPEN Figures
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
Note 6: All typical values are VCC 5.0V, TA 25qC.
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).
(Note 7)
, Output Enable Time 4.5–5.5 1.0 2.5 5.0 ns VI 7V for t
, Output Disable Time 4.5–5.5 1.0 2.5 5.0 ns VI 7V for t
V
CC
(V) Min Typ
4.0 1.0 5.5 n s VI OPEN for t
4.0 1.0 5.5 n s VI OPEN for t
CL 50 pF, RU RD 500
(Note 6)
:
Max Number
Units Conditions Figure
1, 2
PZL
PZH
PLZ
PHZ
Figures
1, 2
Figures
1, 2
Capacitance (Note 8)
Symbol Parameter Typ Max Units Conditions
C
IN
C
I/O
Note 8: TA 25qC, f 1 MHz.
Control Pin Input Capacitance 2 6 pF VCC 5.0V
Input/Output Capacitance 4.5 10 pF VCC, BE 5.0V
AC Loading and Waveforms
NC7SZ384
Input driven by 50: source terminated in 50
includes load and stray capacitance
C
L
Input PRR 1.0 MHz; tW 500 ns
:
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
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