Fairchild NC7SZD384 service manual
NC7SZD384
1-Bit Low Power Bus Switch with Level Shifting
NC7SZD384 1-Bit Low Power Bus Switch with Level Shifting
June 1997
Revised December 2005
General Description
The NC7SZD384 provides 1-bit of high-speed CMOS TTL-compatible 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
signal. When OE
nected to Port B. When OE
high-impedance state exists between the two ports. Reduced
voltage drive to the gate of the FET switch permits nominal level
shifting of 5V to 3.3V through the switch.
is LOW, the switch is on and Port A is con-
is HIGH, the switch is open and a
Features
O
Space saving SOT23 or SC70 5-lead package
O
Ultra small MicroPak¥ Pb-Free leadless package
O5:
switch connection between two ports
)
O
Designed to be used in level-shifting applications
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
NC7SZD384M5X MA05B 8Z4D 5-Lead SOT23, JEDEC MO-178, 1.6mm 3k Units on Tape and Reel
NC7SZD384P5X MAA05A Z4D 5-Lead SC70, EIAJ SC-88a, 1.25mm Wide 3k Units on Tape and Reel
NC7SZD384L6X MAC06A A4 Pb-Free 6-Lead MicroPak, 1.0mm Wide 5k Units on Tape and Reel
Pb-Free package per JEDEC J-STD-020B.
Package Description Supplied As
MicroPak¥ is a trademark of Fairchild Semiconductor Corporation.
© 2005 Fairchild Semiconductor Corporation DS500016 www.fairchildsemi.com
Logic Symbol
NC7SZD384
Pin Descriptions
Connection Diagrams
Pin Assignments for SC70 and SOT23
Pin Name Description
OE Bus Switch Enable
ABus A
BBus B
NC No Connect
Function Table
OE
LAOConnect
H HIGH-Z State Disconnect
(Top View)
Pad Assignments for MicroPak
B
O
Function
(Top Through View)
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NC7SZD384
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC)
DC Switch Voltage (VS)
DC Input Voltage (V
DC Input Diode Current (I
DC Output (I
DC V
OUT
/GND Current (ICC/GND)
CC
Storage Temperature Range (T
Junction Temperature under bias (T
Junction Lead Temperature (T
) (Note 2)
IN
) VIN 0V
IK
) Sink Current 128 mA
STG
J
)
L
(Soldering, 10 seconds)
Power Dissipation (P
) @ 85qC
D
SOT23-5 200 mW
SC70-5 150 mW
0.5V to 7.0V
0.5V to 7.0V
0.5V to 7.0V
)
65q
C to 150qC
)
50 mA
r
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)
) 4.5V 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/Watt
q
C/Watt
DC Electrical Characteristics
V
Symbol Parameter
V
IK
V
IH
V
IL
V
OH
I
I
I
OFF
R
ON
I
CC
'
I
CC
Note 4: All typical values are at VCC 5.0V, TA
Note 5: 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 6: Per TTL driven input (VIN 3.4V, control input only). A and B pins do not contribute to I
Maximum 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
HIGH Level Output Voltage 4.5–5.5 See Figure 3 V VIN V
Input Leakage Current 0–5.5
“OFF” Leakage Current 5.5
Switch On Resistance (Note 5) 4.5 5.0 7.0
Quiescent Supply Current VIN VCC or GND, IO 0
Switch On 5.5 0.8 1.5 mA OE
Switch Off 5.5 10.0
Increase in ICC per Input (Note 6) 5.5 0.8 2.5 mA OE 3.4V, IO 0,
25qC.
CC
(V)
TA 40qC to 85qC
Min Typ
(Note 4)
5.0 7.0
35.0 50.0
CC.
Max
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
:
:
:
P
AOE
CC
VIN 0V, II 64 mA
V
V
Control Input only.
CC
0V, II 30 mA
IN
2.4V, II 15 mA
IN
GND
V
CC
3 www.fairchildsemi.com
AC Electrical Characteristics
TA 40qC to 85qC
NC7SZD384
Symbol Parameter
t
, Propagation Delay Bus-to-Bus 4.5–5.5 0.25 ns VI OPEN
PHL
t
PLH
t
PZL
t
PZH
t
PLZ
t
PHZ
Note 7: All typical values are VCC 5.0V, TA 25qC.
Note 8: 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 8)
, Output Enable Time 4.5–5.5 1.5 7.5 ns VI 7V for t
, Output Disable Time 4.5–5.5 1.0 6.0 ns VI 7V for t
V
CC
(V) Min Typ
CL 50 pF, RU RD 500
(Note 7)
:
Max Number
Units Conditions Figure
VI OPEN for t
VI OPEN for t
PZL Figures
PZH
PLZ Figures
PHZ
Capacitance (Note 9)
Symbol Parameter Typ Max Units Conditions
C
IN
C
I/O
Note 9: TA 25qC f 1MHz
Control Pin Input Capacitance 2 5 pF VCC 5.0V
Input/Output Capacitance 4.5 10 pF VCC 5.0V
AC Loading and Waveforms
Figures
1, 2
1, 2
1, 2
Note: Input driven by 50
C
includes load and stray capacitance.
L
Input PRR
1.0 MHz tw 500 ns.
:
source terminated in 50:.
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
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