2.5Ω bidirectional switches connect inputs to outputs
Zero propagation delay
Undershoot clamp diodes on all switch and control pins
Outputs precharge voltage to minimize signal distortion during live
insertion
TTL-compatible input and output levels
Zero ground bounce
Available in SOIC and QSOP Packages
IDTQS3R800
DESCRIPTION:
The QS3R800 is a 10-bit high-speed CMOS bus switch controlled by
a single enable (ON) input. When
ON
is low, the switch is on and port A is
connected to port B. When
ON
is high, the switch between port A and port
B is open and port B is precharged to the bias voltage. The low ON resistance
(2.5Ω) of the QS3R800 allows inputs to be connected to outputs without
adding propagation delay and without generating additional noise. The
QS3R800 also precharges the B port to a user-selectable bias voltage to
minimize live-insertion noise, which is useful in VME bus applications.
The QS3R800 is characterized for operation at -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
V
B IAS
A
0
B
0
A
9
B
9
ON
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5539/-
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ON
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
SO24-2
SO24-8
24
23
22
21
20
19
18
17
16
15
14
13
Vcc
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
V
B IAS
ABSOLUTE MAXIMUM RATINGS
Symbol
V
TERM(2)
V
BIAS
V
TERM(3)
V
AC
I
OUT
I
IK
P
MAX
T
STG
Description
Supply Voltage to Ground
Bias Voltage Range
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current
Input Clamp Current
Maximum Power Dissipation
Storage Temperature
Max.
– 0.5 to +7
(1)
Unit
V
V
V
V
mA
mA
W
°C
– 0.5 to V
CC
– 0.5 to V
CC
+ 0.5
-3
128
-50
.5
– 65 to +150
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
SOIC/ QSOP
TOP VIEW
(T
A
= +25
O
C, f = 1.0MHz, V
IN
= 0V, V
OUT
= 0V)
Pins
Control Inputs
Quickswitch Channels (Switch OFF)
Typ.
3
5
Max.
(1)
4
6
Unit
pF
pF
NOTE:
1. This parameter is guaranteed at characterization but not tested.
PIN DESCRIPTION
Pin Names
A
0
- A
9
B
0
- B
9
ON
V
BIAS
I/O
I/O
I/O
I
I
Description
Bus A
Bus B
Bus Switch Enable
Bias Voltage
FUNCTION TABLE
(1)
ON
L
H
B
0
-B
9
A
0
- A
9
V
BIAS
Function
Connect
Precharge
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
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
= 5.0V ± 10%
Symbol
V
IH
V
IL
V
BIAS
I
O
I
IN
I
OZ
R
ON
R
ON
Parameter
Input HIGH Voltage
Input LOW Voltage
Bias Voltage
Bias Current
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Switch On Resistance
(2)
Switch On Resistance
(2)
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
Vcc = 5V
Vcc = 4.5V, V
BIAS
= 2.4V, V
O
= 0,
ON
= HIGH
0V
≤
V
IN
≤
Vcc
0V
≤
V
OUT
≤
Vcc
Vcc = Min., V
IN
= 0V, I
ON
= 30mA
Vcc = Min., V
IN
= 2.4V, I
ON
= 15mA
Min.
2
—
1.3
0.25
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
2.5
4
Max.
—
0.8
Vcc
—
±1
±1
5
8.5
Unit
V
V
V
mA
µA
µA
Ω
Ω
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
2. During input/output leakage, testing all pins are at HIGH or LOW state.
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
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Control Input HIGH
Dynamic Power Supply Current per MHz
(4)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or Vcc, f = 0
V
CC
= Max., V
IN
= 3.4V
(3)
, f = 0
V
CC
= Max., A and B pins open
Data inputs = GND
Control Input Toggling at 50% Duty Cycle
Typ.
(2)
0.2
—
—
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. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
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
= -40°C to +85°C, V
CC
= 5.0V ± 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, 3)
A to B or B to A
Switch Turn-On Delay
ON
to A or B
Switch Turn-Off Delay
(2)
ON
to A or B
Min.
(1)
—
1.5
1.5
Typ.
—
—
—
Max.
0.12
7.5
6.5
Unit
ns
ns
ns
NOTES:
1. Minimums guaranteed but not tested.
2. This parameter is guaranteed but not 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 for 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
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS
XXXXX
Device Type
XX
Package
X
Process
Blank
Industrial (-40°C to +85°C )
SO
Q
Small Outline IC (SO24-2)
Quarter Size Outline Package (SO24-8)
3R800
High Speed CM OS 10-Bit Low Resistance
QuickSwitch with Precharged Outputs
CORPORATE HEADQUARTERS
2975 Stender Way
Santa Clara, CA 95054
for SALES:
800-345-7015 or 408-727-6116
fax: 408-492-8674
www.idt.com*
*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2.
The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc.
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