1
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5539/-
c
IDTQS3R800
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS 10-BIT LOW
RESISTANCE QUICKSWITCH WITH
PRECHARGED OUTPUTS
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
(2.5
) 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 -40C to +85C.
A
0
B
0
B
9
A
9
ON
V
B IA S
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
- 2.5 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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
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
ON
V
B IA S
PIN CONFIGURATION
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
BIAS
Bias Voltage Range
0.5 to V
CC
V
V
TERM(3)
DC Input Voltage V
IN
0.5 to V
CC
+ 0.5
V
V
AC
AC Input Voltage (pulse width
20ns)
-3
V
I
OUT
DC Output Current
128
mA
I
IK
Input Clamp Current
-50
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 at characterization but not tested.
PIN DESCRIPTION
Pin Names
I/O
Description
A
0
- A
9
I/O
Bus A
B
0
- B
9
I/O
Bus B
ON
I
Bus Switch Enable
V
BIAS
I
Bias Voltage
FUNCTION TABLE
(1)
ON
B
0
-B
9
Function
L
A
0
- A
9
Connect
H
V
BIAS
Precharge
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
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IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
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
V
BIAS
Bias Voltage
Vcc = 5V
1.3
--
Vcc
V
I
O
Bias Current
Vcc = 4.5V, V
BIAS
= 2.4V
, V
O
= 0, ON = HIGH
0.25
--
--
mA
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
Vcc
--
--
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
Vcc
--
--
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
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25C.
2. During input/output leakage, testing all pins are at HIGH or LOW state.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
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
Data inputs = GND
Control 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
(2, 3)
A to B or B to A
--
--
0.12
ns
t
PZL
t
PZH
Switch Turn-On Delay
ON to A or B
1.5
--
7.5
ns
t
PLZ
t
PHZ
Switch Turn-Off Delay
(2)
ON to A or B
1.5
--
6.5
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.
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IDTQS3R800
HIGH-SPEED CMOS 10-BIT LOW RESISTANCE QUICKSWITCH
INDUSTRIAL TEMPERATURE RANGE
ID TQS
XXXXX
XX
Package
D evice Type
Blank
Industrial (-40C to +85C )
3R 800
H igh Speed C MOS 10-Bit Low R esistance
QuickSw itch w ith Precharged Outputs
X
Process
Small Outline IC (SO24-2)
Quarter S ize Outline Package (SO24-8)
SO
Q
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
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