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IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5543/-
c
IDTQS3R861
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS 10-BIT LOW
RESISTANCE BUS SWITCH WITH
FLOW-THROUGH PINOUT
DESCRIPTION:
The QS3R861 provides a set of ten high-speed CMOS TTL-compatible
bus switches. The very low ON resistance (2.5
) 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 -40C to +85C.
A
0
BE
B
0
A
9
B
9
FUNCTIONAL BLOCK DIAGRAM
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
-
Undershoot clamp diodes on all switch and control pins
-
Available in 24-pin SOIC and QSOP Packages
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 isolation
-
Bus isolation
-
Clock gating
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
PIN CONFIGURATION
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
SO24-2
SO24-8
Vcc
B
8
B
7
A
7
B
6
B
5
A
5
B
0
A
0
A
1
B
1
B
2
A
2
A
3
B
3
B
4
A
4
BE
NC
SOIC/ QSOP
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
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
.5
W
T
STG
Storage Temperature
65 to +150
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. Vcc Terminals.
3. All terminals except Vcc.
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz, V
IN
= 0V, V
OUT
= 0V)
Pins
Typ.
Max.
(1)
Unit
Control Inputs
3
4
pF
Quickswitch Channels (Switch OFF)
5
6
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
Description
BE
Bus Enable
A
0
- A
9
Bus A
B
0
- B
9
Bus B
FUNCTION TABLE
(1)
BE
A
0
- A
9
Function
H
Hi-Z
Disconnect
L
B
0
- B
9
Connect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
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IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
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
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
R
ON
(ohms)
V
IN
(Volts)
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40C to +85C, V
CC
= 5.0V 10%
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
Vcc
--
0.01
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
Vcc, Switches OFF
--
0.01
1
A
R
ON
Switch ON Resistance
(2)
Vcc = Min., V
IN
= 0V
,
I
ON
= 30mA
--
2.5
5
R
ON
Switch ON Resistance
(2)
Vcc = Min., V
IN
= 2.4V
,
I
ON
= 15mA
--
4
8.5
V
P
Pass Voltage
(3)
V
IN
= Vcc = 5V, I
OUT
= -5
A
3.7
4
4.3
V
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25C.
2. Max value of R
ON
is guaranteed but not production tested.
3. Pass voltage is guaranteed but not production tested.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Typ.
(2)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or Vcc, f = 0
0.2
3
A
I
CC
Power Supply Current per Control Input HIGH
V
CC
= Max., V
IN
= 3.4V
(3)
, f = 0
--
2.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(4)
V
CC
= Max., A and B pins open
BE Input Toggling at 50% Duty Cycle
--
0.25
mA/MHz
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
= 5.0V, T
A
= 25C.
3. Per TLL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
Icc
.
4. 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.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40C to +85C, V
CC
= 5.0V 10%
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min.
(1)
Typ.
Max.
Unit
t
PLH
t
PHL
Data Propagation Delay
(4)
A to B, B to A
--
--
0.12
(3)
ns
t
PZL
t
PZH
Switch Turn-on Delay
(2)
BE to A or B
1.5
--
5.6
ns
t
PLZ
t
PHZ
Switch Turn-off Delay
BE to A or B
1.5
--
4.5
ns
NOTES:
1. Minimums are guaranteed but not production tested.
2. This parameter is guaranteed but not production tested.
3. The time constant for the switch alone is of the order of 0.12ns for C
L
= 50pF.
4. The bus switch contributes no propagation delay other than the RC delay of the ON resistance of the switch and the load capacitance. 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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IDTQS3R861
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS
XXXXX
XX
Package
D evice Type
Blank
Industrial (-40C to +85C )
Sm all Outline IC (S O24-2)
Quarter Size O utline Package (SO 24-8)
SO
Q
3R 861
H igh Speed CM OS 10-Bit Low Resistance Bus Switch
w ith Flow-T hrough Pinout
X
Process
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