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IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
INDUSTRIAL TEMPERATURE RANGE
DECEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5598/1
c
INDUSTRIAL TEMPERATURE RANGE
FEATURES:
Enhanced N channel FET with no inherent diode to Vcc
Pin compatible with the 74'125 function
Zero propagation delay, zero added ground bounce
Undershoot clamp diodes on all switch and control inputs
Available in QSOP and SOIC packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Power conservation
Capacitance reduction and isolation (mass storage, work
stations)
Logic replacement (data processing)
Clock gating
Bus isolation
IDTQS3125
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
QUADRUPLE BUS SWITCH WITH
INDIVIDUAL ACTIVE LOW ENABLES
DESCRIPTION:
The QS3125 provides a set of four high-speed low resistance CMOS
switches connecting inputs to outputs without propagation delay and without
generating additional ground bounce noise. Individual enables (OE) are
used to turn on the switches. The QS3125 is ideal for signal and control
switching since the device adds no noise, ground bounce, propagation
delay, or significant power consumption to the system. The QS3125 can also
be used for analog switching applications such as video.
QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.
The QS3125 is characterized for operation at -40C to +85C.
4O E
1
A
1
Y
2
Y
3
Y
4
Y
2
A
3
A
4
A
3O E
2O E
1O E
FUNCTIONAL BLOCK DIAGRAM
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
PIN CONFIGURATION
QSOP
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
16
15
14
13
NC
1OE
1
A
1
Y
2OE
2
A
2
Y
GND
V
CC
4OE
4
A
4
Y
3OE
3
A
3
Y
NC
SOIC
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
12
14
13
1OE
1
A
1
Y
2OE
2
A
2
Y
GND
V
CC
4OE
4
A
4
Y
3OE
3
A
3
Y
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 (T
A
= 85C)
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
X = Don't Care
xOE
xA
xY
Function
L
H
H
Connect
L
L
L
Connect
H
X
X
Disconnect
FUNCTION TABLE
(1)
Pins
Typ.
Max.
(1)
Unit
OE (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
1
A
- 4
A
I/O
Bus A
1
Y
- 4
Y
I/O
Bus Y
1OE - 4OE
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
.
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IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
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 Inputs
2
--
--
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
--
--
0.8
V
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
V
CC
--
--
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
V
CC
, Switches OFF
--
--
1
A
R
ON
Switch ON Resistance
(2)
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
--
5
7
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
--
10
15
V
P
Pass Voltage
(3)
V
IN
= V
CC
= 5V, I
OUT
= -5
A
3.7
4
4.2
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. R
ON
is guaranteed but not production tested.
3. Pass voltage is guaranteed but not production tested.
16
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
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 Y 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 Y 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)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
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 Y Pins Open, Control Inputs Toggling @ 50% Duty Cycle
0.25
mA/MHz
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)
0.25
(3)
ns
t
PHL
A to Y
t
PZL
Switch Turn-On Delay
1.5
6.5
ns
t
PZH
OE to xA/xY
t
PLZ
Switch Turn-Off Delay
(2)
1.5
5.5
ns
t
PHZ
OE to xA/xY
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 0.25ns 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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IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
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)
Quarter Size Outline Package
Small Outline IC
Q
S1
3125
High Speed CMOS Quadruple Bus Switch with
Individual Active Low Enables
X
Process
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