FEATURES/BENEFITS
Enhanced N channel FET with no inherent diode to V
CC
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 QSOP, and SOIC (SO) packages
QS32862 is 25
version for low noise
Active Low and High enable control
APPLICATIONS
Hot-swapping, hot-docking (Application Note AN-13)
Voltage translation (5V to 3.3V; Application Note AN-11)
Power conservation
Capacitance reduction and isolation
Applications requiring Active-High enabling
Bus isolation
Clock gating
DESCRIPTION
The QS3862 and QS32862 each provide a set of ten high speed
CMOS, TTL Compatible bus switches. The low ON resistance (5
) of
the QS3862 allows inputs to be connected to outputs without adding
propagation delay and without generating additional ground bounce
noise. The switches are controlled by independent active Low enable
(
BE) and active High enable (BE) controls.
The QS32862 includes internal 25
series termination resistors to
reduce reflection noise in high speed applications. When closed, the
switch acts as the source (series) termination for the driver connected
to it.
The QS3862 is ideal for switching digital buses as well as hot-
plugging, hot-docking, and voltage translation.
FUNCTIONAL BLOCK DIAGRAM
QS3862
QS32862
ADVANCE
INFORMATION
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
10-BIT BUS SWITCH WITH
ACTIVE HIGH AND LOW ENABLES
OCTOBER 1999
1
1999 Integrated Device Technology, Inc
DSC-XXXXXX
A0
A9
B0
B9
BE
BE
2
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
QSOP, SOIC
Pins
Typ
Max
Unit
Control Inputs
3
5
pF
QuickSwitch Channels
5
7
pF
(Swithc OFF)
Name
I/O
Function
BE
I
Active High Bus Enable
BE
I
Active High Bus Enable
A0-A9
I/O
Bus A
B0-B9
I/O
Bus B
PIN DESCRIPTION
BE
BE
A0-A9
Function
L
L
Hi-Z
Disconnect
L
H
Hi-Z
Disconnect
H
L
B0-B9
Connect
L
L
Hi-Z
Disconnect
FUNCTION TABLE
PIN CONFIGURATION
(ALL PINS TOP VIEW)
QSOP, SOIC (SO)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage to Ground ...................................................................... 0.5V to +7.0V
DC Switch Voltage V
S
............................................................................ 0.5V to +7.0V
DC Input Voltage V
IN
.............................................................................. 0.5V to +7.0V
AC Input Voltage (for a pulse width
20ns) .......................................................... 3.0V
DC Output Current Max. Sink Current/Pin ........................................................... 120mA
Maximum Power Dissipation ............................................................................ 0.5 watts
T
STG
Storage Temperature .................................................................... 65 to +150C
Note: ABSOLUTE MAXIMUM CONTINUOUS
RATINGS are those values beyond which
damage to the device may occur. Exposure to
these conditions or conditions beyond those
indicated may adversely affect device reliability.
Functional operation under absolute-maximum
conditions is not implied.
CAPACITANCE
T
A
= 25C, f = 1MHz, V
IN
= 0V
Note: Capacitance is characterized but not
production tested. For total capacitance while the
switch is ON, please see Section 1 under "Input
and Switch Capacitance."
24
23
22
21
20
19
18
17
16
15
14
13
BE
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
G ND
V
C C
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
1
2
3
4
5
6
7
8
9
10
11
12
BE
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
3
Symbol
Parameter
Test Conditions
Min
Typ
(1)
Max
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH
2.0
--
--
V
for Control Inputs
V
IL
Input LOW Voltage
Guaranteed Logic LOW
--
--
0.8
V
for Control Inputs
| I
IN
|
Input Leakage Current
0
V
IN
V
CC
--
0.01
1
A
(Control Inputs)
| I
OZ
|
Off-State Current (Hi-Z)
0
V
OUT
V
CC
, Switches Off
--
0.01
1
A
R
ON
Switch ON Resistance
(2)
V
CC
= Min., V
IN
= 0.0V,
3862
--
5
7
I
ON
= 30mA
32862
20
28
40
R
ON
Switch ON Resistance
(2)
V
CC
= Min., V
IN
= 2.4V
3862
--
10
15
I
ON
= 15mA
32862
20
35
48
V
P
Pass Voltage
(3)
V
IN
= V
CC
= 5V, I
OUT
= 5A
3.7
4
4.2
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
T
A
= 40C to 85C, V
CC
= 5.0V 10%
Notes:
1. Typical values indicate V
CC
= 5.0V and T
A
= 25C.
2. For a diagram explaining the procedure for R
ON
measurement, please see Section 1 under "DC Electrical Characteristics."
Max. value of R
ON
guaranteed, but not production tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE VS V
IN
AT V
CC
= 5.0V (QS3862)
Note: For QS32862, add 23
to R
ON
shown.
16
14
12
10
8
6
4
2
0
R
O N
(ohm s)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
4
1999 Integrated Device Technology, Inc
IDT
QS3862 AND QS32862
DSC-XXXXXX
POWER SUPPLY CHARACTERISTICS OVER OPERATING RANGE
T
A
= 40C to 85C, V
CC
= 5.0V 10%
Symbol
Parameter
Test Conditions
(1)
Typ
(2)
Max
Unit
I
CCQ
Quiescent Power
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
0.2
3.0
A
Supply Current
I
CC
Power Supply Current
V
CC
= Max., V
IN
= 3.4V
(3)
, f = 0
--
2.5
mA
per Input HIGH
per Control Input
Q
CCD
Dynamic Power Supply
V
CC
= Max., A and B Pins Open,
--
0.25
mA/
Current per MHz
(4)
BE,
BE Inputs
MHz
Toggling @ 50% Duty Cycle
Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Typical Values are at V
CC
= 5.0V, +25C Ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
I
CC
.
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.
QS3862
QS32862
Symbol
Description
(1)
Min
Typ
Max
Min
Typ
Max
Unit
t
PLH
Data Propagation Delay
(2,4)
--
--
0.25
(3)
--
--
1.25
(3)
ns
t
PHL
A to B or B to A
t
PZL
Switch Turn-on Delay
1.5
--
6.5
1.5
--
7.5
ns
t
PZH
BE or BE to A or B
t
PLZ
Switch Turn-off Delay
(2)
1.5
--
5.5
1.5
--
5.5
ns
t
PHZ
BE or BE to A or B
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= 40C to 85C, V
CC
= 5.0V 10%
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Notes:
1. See Test Circuit and Waveforms. Minimums 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 0.25ns for QS3862 and 1.25ns for QS32862 at C
L
= 50pF.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/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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