HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS
HIGH-SPEED CMOS
QUADRUPLE BUS SWITCH WITH
INDIVIDUAL ACTIVE LOW ENABLES
FEATURES:
•
•
•
•
•
IDTQS3125
DESCRIPTION:
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
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
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 -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
1
A
2
A
3
A
4
A
1O E
2O E
3O E
4O E
1
Y
2
Y
3
Y
4
Y
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
DECEMBER 1999
DSC-5598/1
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
(2)
V
TERM
(3)
Description
Supply Voltage to Ground
DC Switch Voltage V
S
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current
Maximum Power Dissipation (T
A
= 85°C)
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
0.5
–65 to +150
Unit
V
V
V
V
mA
W
°C
NC
1OE
1
A
1
Y
2OE
2
A
2
Y
GND
1
2
3
4
5
6
7
8
QSOP
TOP VIEW
1
6
1
5
1
4
1
3
1
2
1
1
1
0
9
V
CC
4OE
4
A
4
Y
3OE
3
A
3
Y
NC
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
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
.
CAPACITANCE
(T
A
= +25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Pins
OE
(Inputs)
Quickswitch Channels (Switch OFF)
Typ.
3
5
Max.
(1)
5
7
Unit
pF
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
I/O
I/O
I/O
I
Bus A
Bus Y
Bus Switch Enable
Description
1OE
1
A
1
Y
2OE
2
A
2
Y
GND
1
2
3
4
5
6
7
SOIC
TOP VIEW
1
4
1
3
1
2
1
1
1
0
9
8
V
CC
4OE
4
A
4
Y
3OE
3
A
3
Y
1
A
- 4
A
1
Y
- 4
Y
1OE
-
4OE
FUNCTION TABLE
(1)
xOE
L
L
H
xA
H
L
X
xY
H
L
X
Function
Connect
Connect
Disconnect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
2
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 5V ± 5%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
V
P
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Switch ON Resistance
(2)
Pass Voltage
(3)
Test Conditions
Guaranteed Logic HIGH for Control Inputs
Guaranteed Logic LOW for Control Inputs
0V
≤
V
IN
≤
V
CC
0V
≤
V
OUT
≤
V
CC
, Switches OFF
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
V
IN
= V
CC
= 5V, I
OUT
= -5µA
Min.
2
—
—
—
—
—
3.7
Typ.
(1)
Max.
—
—
—
—
5
10
4
—
0.8
±1
±1
7
15
4.2
V
Unit
V
V
µA
µA
Ω
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25°C.
2. R
ON
is guaranteed but not production tested.
3. Pass voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
16
R
ON
(ohms)
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
3
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Input HIGH
(2)
Dynamic Power Supply Current per MHz
(3)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
V
CC
= Max., V
IN
= 3.4V, f = 0
V
CC
= Max., A and Y Pins Open, Control Inputs Toggling @ 50% Duty Cycle
Max.
3
2.5
0.25
Unit
µA
mA
mA/MHz
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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5V ± 5%
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise noted.
Symbol
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
Parameter
Data Propagation Delay
(2)
A to Y
Switch Turn-On Delay
OE
to xA/xY
Switch Turn-Off Delay
(2)
OE
to xA/xY
Min
.
(1)
1.5
1.5
Typ.
Max.
0.25
(3)
6.5
5.5
Unit
ns
ns
ns
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.
4
IDTQS3125
HIGH-SPEED CMOS QUADRUPLE BUS SWITCH WITH INDIVIDUAL ENABLES
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