Enhanced N channel FET with no inherent diode to Vcc
Ω
2.5Ω bidirectional switches connect inputs to outputs
Zero propagation delay, zero ground bounce
Undershoot clamp diodes on all switch and control inputs
Available in SOIC and QSOP packages
The QS3R861 provides a set of ten high-speed CMOS TTL-compatible
bus switches. The very low ON resistance (2.5Ω) of the QS3R861 allows
inputs to be connected without adding propagation delay and without
generating additional ground bounce noise. The Bus Enable (BE) signal
turns the switches on.
The low ON resistance of the QS3R861 makes it ideal for PCI hot-
plugging or hot-swapping applications.
The QS3R861 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
• Hot-swapping, 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
FUNCTIONAL BLOCK DIAGRAM
A
0
B
0
A
9
B
9
BE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5543/2
IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Vcc
BE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
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
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
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
Control Inputs
Quickswitch Channels (Switch OFF)
Typ.
3
5
Max.
(1)
4
6
Unit
pF
pF
SOIC/ QSOP
TOP VIEW
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
A
0
- A
9
B
0
- B
9
BE
Bus A
Bus B
Bus Switch Enable
Description
FUNCTION TABLE
(1)
BE
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
A
0
- A
9
Z
B
0
- B
9
Function
Disconnect
Connect
2
IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
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 ± 10%
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 Pins
Guaranteed Logic LOW for Control Pins
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.
—
—
0.01
0.01
2.5
4
4
—
0.8
±1
±1
5
8.5
4.3
V
Unit
V
V
µA
µA
Ω
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25°C.
2. Max value of 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
14
R
ON
(ohms)
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
V
IN
(Volts)
2.0
2.5
3.0
3.5
3
IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Input HIGH
(3)
Dynamic Power Supply Current per MHz
(4)
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 B Pins Open,
BE
Input Toggling @ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Typical values are at V
CC
= 5V and T
A
= 25°C.
3. 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.
Typ.
(2)
0.2
Max.
3
2.5
0.25
Unit
µA
mA
mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5V ± 10%
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 B, B to A
Switch Turn-On Delay
BE
to A or B
Switch Turn-Off Delay
(2)
BE
to A or B
Min
.
(1)
1.5
1.5
Typ.
Max.
0.12
(3)
5.6
4.5
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 0.12ns 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
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