NSC 74LVX3L383QSCX

74LVX3L383
10-Bit Low Power Bus-Exchange Switch
General Description
Features
The LVX3L383 provides two sets of high-speed CMOS TTLcompatible bus switches. The low on resistance of the
switch allows inputs to be connected to outputs without
adding propagation delay or generating additional ground
bounce noise. The device operates as a 10-bit bus switch or
a 5-bit bus exchanger. The bus exchange (BX) signal provides nibble swapping of the AB and CD pairs of signals.
This exchange configuration allows byte swapping of buses
in systems. It can also be used as a quad 2-to-1 multiplexer
and to create low delay barrel shifters. The bus enable (BE)
signal turns the switches on.
Y
Y
Y
Y
Y
Y
5X switch connection between two ports
Zero propagation delay
Ultra low power with 0.2 mA typical ICC
Zero ground bounce in flow-through mode
Control inputs compatible with TTL level
Available in SOIC, TSSOP and QSOP (SSOP, 0.15×
body width) packages
Logic Diagram
Connection Diagram
Pin Assignment for
SOIC, QSOP and TSSOP
TL/F/11652 – 2
Pin Names
BE
TL/F/11652 – 1
Truth Table
BE
BX
A0 – A4
B0 – B4
Function
H
X
High-Z State
High-Z State
Disconnect
L
L
C0 – C4
D0 – D4
Connect
L
H
D0 – D4
C0 – C4
Exchange
Order Number
Description
Bus Switch Enable
BX
Bus Exchange
A0 –A4, B0 –B4
Buses A, B
C0 –C4, D0 –D4
Buses C, D
SOIC JEDEC
QSOP
TSSOP
74LVX3L383WM
74LVX3L383WMX
74LVX3L383QSC
74LVX3L383QSCX
74LVX3L383MTC
74LVX3L383MTCX
M24B
MQA24
MTC24
See NS
Package Number
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation
TL/F/11652
RRD-B30M17/Printed in U. S. A.
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74LVX3L383 10-Bit Low Power Bus-Exchange Switch
December 1996
Absolute Maximum Ratings (Note 1)
Recommended Operating
Conditions
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
b 0.5V to a 7.0V
Supply Voltage (VCC)
Supply Voltage (VCC)
Free Air Operating Temperature (TA)
4.0V to 5.5V
b 40§ C to a 85§ C
b 0.5V to a 7.0V
DC Switch Voltage (VS)
b 0.5V to a 7.0V
DC Input Voltage (VI) (Note 2)
b 20 mA
DC Input Diode Current (IIN) with VI k 0
120 mA
DC Output (IO) Sink Current
b 65§ C to a 150§ C
Storage Temperature Range (TSTG)
Power Dissipation
0.5W
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’’
table 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.
DC Electrical Characteristics
74LVX3L383
Symbol
Parameter
VCC
(V)
TA e b40§ C to a 85§ C
Typ
(Note 5)
Min
VIK
Maximum Clamp
Diode Voltage
VIH
Minimum High
Level Input Voltage
4.75–5.25
VIL
Maximum Low
Level Input Voltage
4.75–5.25
IIN
Maximum Input
Leakage Current
4.75
Units
Conditions
Max
b 1.2
V
IIN e b18 mA
2.0
V
0.8
0
10
5.25
g1
5.25
g 10
IOZ
Maximum TRI-STATEÉ
I/O Leakage
IOS
Short Circuit Current
RON
Switch On
Resistance (Note 3)
ICC
Maximum Quiescent
Supply Current
5.25
DICC
Increase in ICC
per Input (Note 4)
5.25
4.75
100
mA
mA
mA
4.75
0 s VIN s 5.25V
0 s A, B s VCC
VI(A), VI(B) e 0V,
VI(B), VI(A) e 4.75V
5
7
X
10
15
X
VI e 2.4V, ION e 15 mA
10
mA
VI e VCC, GND
IO e 0
2.5
mA
VIN e 3.15V, IO e 0
Per Control Input
0.2
VI e 0V, ION e 30 mA
Note 3: Measured by voltage drop between A and B pin at indicated current through the switch. On resistance is determined by the lower of the voltages on the two
(A or B) pins.
Note 4: Per TTL driven input (VIN e 3.15V, control inputs only). A and B pins do not contribute to ICC.
Note 5: All typical values are at VCC e 5.0V, TA e 25§ C.
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2
AC Electrical Characteristics
74LVX3L383
Symbol
VCC
(V)
Parameter
Typ
(Note 5)
Min
tPLH
tPHL
Data Propagation Delay
An to Bn or Bn to An (Note 6)
4.75
tPLH
tPHL
Switch Exchange Time
BX to An or Bn
4.75
tPZL
tPZH
Switch Enable Time
BE to An, Bn
tPLZ
tPHZ
Switch Disenable Time
BE to An, Bn
Units
TA e b40§ C to a 85§ C
CL e 50 pF
Max
0.25
ns
1.5
6.5
ns
4.75
1.5
6.5
ns
4.75
1.5
5.5
ns
Note 5: All typical values are at VCC e 5.0V, TA e 25§ C.
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 load capacitance. The time constant for the switch and alone is of the order of 0.25 ns for 50 pF load. Since this time constant is much smaller
than the rise/fall times of typical driving signals, it adds very little propagation delay to the system. Propagation delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.
Capacitance (Note)
Parameter
Typ
Max
Units
Conditions
CIN
Symbol
Control Input Capacitance
4
6
pF
VCC e 5.0V
CI/O (OFF)
Input/Output Capacitance
9
13
pF
VCC e 5.0V
Note: Capacitance is characterized but not tested.
74LVX3L383 VIN vs RON (Typ)
TL/F/11652 – 4
3
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74LVX3L383 Ordering Information
The device number is used to form part of a simplified purchasing code where the package type and temperature range are
defined as follows:
TL/F/11652 – 5
inches
Physical Dimensions millimeters
24-Lead (0.300× Wide) Small Outline Package
Order Number 74LVX3L383WM or 74LVX3L383WMX
NS Package Number M24B
http://www.national.com
4
Physical Dimensions inches (Continued)
24-Lead (0.150× Wide) Shrink Small Outline Package, JEDEC (QSC)
(also known as QSOP)
Order Number 74LVX3L383QSC or 74LVX3L383QSCX
NS Package Number MQA24
5
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74LVX3L383 10-Bit Low Power Bus-Exchange Switch
Physical Dimensions inches (Continued)
24-Lead Thin Small Outline Package, JEDEC
Order Number 74LVX3L383MTC or 74LVX3L383MTCX
NS Package Number MTC24
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