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IDTQS3LR384
HIGH-SPEED CMOS 10-BIT LOW POWER LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5547/1
c
INDUSTRIAL TEMPERATURE RANGE
FEATURES:
Enhanced N channel FET with no inherent diode to Vcc
2.5
bidirectional switches connect inputs to outputs
Zero propagation delay, zero ground bounce
Ultra low power with 0.2
A typical Icc
Undershoot clamp diodes on all switch and control pins
Two enables control five bits each
Available in SOIC, QSOP, and TSSOP packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
Hot-swapping and hot-docking (low resistance for PCI and
Compact PCI applications)
Voltage translation (5V to 3.3V)
Power Conservation
Capacitance reduction and isloation
Bus Isolation
Clock Gating
IDTQS3LR384
FUNCTIONAL BLOCK DIAGRAM
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
10-BIT LOW POWER, LOW
RESISTANCE BUS SWITCH
DESCRIPTION:
The QS3LR384 provides a set of ten high-speed CMOS TTL-compatible
bus switches. Two banks of 5 switches are controlled by independent Bus
Enable (BE) signals. The very low R
ON
resistance (2.5
) of the QS3LR384
allows inputs to be connected without adding propagation delay and without
generating additional ground bounce noise.
The low ON resistance of the QS3LR384 makes it ideal for PCI hot-
plugging or hot-swapping applications.
The QS3LR384 is characterized for operation at -40C to +85C.
A
0
B
0
A
4
B
4
B
5
B
9
A
5
A
9
BE B
BEA
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3LR384
HIGH-SPEED CMOS 10-BIT LOW POWER LOW RESISTANCE BUS SWITCH
PIN CONFIGURATION
Symbol
Description
Max
Unit
V
TERM
(2)
Supply Voltage to Ground
0.5 to +7
V
V
TERM
(3)
DC Switch Voltage V
S
0.5 to +7
V
V
TERM
(3)
DC Input Voltage V
IN
0.5 to +7
V
V
AC
AC Input Voltage (pulse width
20ns)
3
V
I
OUT
DC Output Current
120
mA
P
MAX
Maximum Power Dissipation
0.5
W
T
STG
Storage Temperature
65 to +150
C
ABSOLUTE MAXIMUM RATINGS
(1)
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
BEA
BEB
B
0
- A
4
B
5
- B
9
Function
H
H
Hi-Z
Hi-Z
Disconnect
L
H
A
0
- A
4
Hi-Z
Connect
H
L
Hi-Z
A
5
- A
9
Connect
L
L
A
0
- A
4
A
5
- A
9
Connect
FUNCTION TABLE
(1)
Pins
Typ.
Max.
(1)
Unit
Control Inputs
3
5
pF
Quickswitch Channels (Switch OFF)
5
7
pF
CAPACITANCE
(T
A
= +25C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
NOTE:
1. This parameter is guaranteed but not production tested.
Pin Names
I/O
Description
A
0
- A
9
I/O
Bus A
B
0
- B
9
I/O
Bus B
BEA, BEB
I
Bus Switch Enable
PIN DESCRIPTION
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. V
CC
terminals.
3. All terminals except V
CC
.
SOIC/ QSOP/ TSSOP
TOP VIEW
BEA
GND
B
9
A
9
A
8
A
6
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17
18
19
20
21
22
23
24
11
Vcc
B
8
B
7
A
7
B
6
B
5
A
5
BEB
B
0
A
0
A
1
B
1
B
2
A
2
A
3
B
3
B
4
A
4
3
IDTQS3LR384
HIGH-SPEED CMOS 10-BIT LOW POWER LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
R
ON
(ohms)
V
IN
(Volts)
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH for Control Pins
2
--
--
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW for Control Pins
--
--
0.8
V
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
V
CC
--
0.01
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
V
CC,
Switches OFF
--
0.01
1
A
R
ON
Switch ON Resistance
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
--
2.5
5
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
--
4
8.5
V
P
Pass Voltage
(2)
V
IN
= V
CC
= 5V, I
OUT
= -5
A
3.7
4
4.3
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5V 5%
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25C.
2. Pass voltage is guaranteed but not production tested.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
2
4
6
8
10
12
14
16
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS3LR384
HIGH-SPEED CMOS 10-BIT LOW POWER LOW RESISTANCE BUS SWITCH
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TTL-driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
Icc.
3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant
AC or DC currents as they transition. This parameter is guaranteed but not production tested.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Typ.
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
0.2
3
A
I
CC
Power Supply Current per Input HIGH
(2)
V
CC
= Max., V
IN
= 3.4V, f = 0
2.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(3)
V
CC
= Max., A and B Pins Open,
0.25
mA/MHz
Control Inputs Toggling @ 50% Duty Cycle
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40C to +85C, V
CC
= 5V 5%
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min
.
(1)
Typ.
Max.
Unit
t
PLH
Data Propagation Delay
(2)
0.12
(3)
ns
t
PHL
Ax to Bx, Bx to Ax
t
PZL
Switch Turn-On Delay
1.5
6.5
ns
t
PZH
BEA, BEB to Ax, Bx
t
PLZ
Switch Turn-Off Delay
(2)
1.5
5.5
ns
t
PHZ
BEA, BEB to Ax, Bx
NOTES:
1. Minimums are guaranteed but not production tested.
2. This parameter is guaranteed but not production tested.
3. 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 alone
is of the order of 0.12ns at C
L
= 50pF. Since this time constant is much smaller than the rise and 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.
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IDTQS3LR384
HIGH-SPEED CMOS 10-BIT LOW POWER LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
IDTQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C)
Small Outline IC
Quarter Size Outline Package
Thin Shrink Small Outline Package
SO
Q
PA
3LR384
High Speed CMOS 10-Bit Low Power, Low
Resistance Bus Switch
X
Process
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