1
IDTQS32X2861
HIGH-SPEED CMOS 20-BIT BUS SWITCH WITH FLOW-THROUGH PINOUT
INDUSTRIAL TEMPERATURE RANGE
MARCH 2002
2002 Integrated Device Technology, Inc.
DSC-5727/2
c
INDUSTRIAL TEMPERATURE RANGE
.UNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
.EATURES:
Enhanced N channel FET with no inherent diode to Vcc
25
series resistors for low noise
Undershoot clamp diodes on all switch and control inputs
Available in 48-pin QVSOP package
APPLICATIONS:
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Power conservation
Capacitance reduction and isolation
Bus isolation
Clock gating
IDTQS32X2861
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
20-BIT BUS SWITCH
WITH FLOW-THRU PINOUT
A
0
A
9
B
0
B
9
BE
1
A
10
A
19
B
10
B
19
BE
2
DESCRIPTION:
The QS32X2861 provides two sets of ten high-speed CMOS TTL-
compatible bus switches. The low ON resistance of the QS32X2861 allows
inputs to be connected to outputs without adding propagation delay and
without generating additional ground bounce noise. The QS32x2861 adds
an internal 25
series termination resistor to each switch to reduce
reflection noise in high-speed applications. The Bus Enable (
BEn) signals
turn the switches on.
The QS32X2861 bus switch is ideal for switching digital buses, as well
as for hotplug buffering and 5V to 3V conversion.
The QS32X2861 is characterized for operation at -40C to +85C.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32X2861
HIGH-SPEED CMOS 20-BIT BUS SWITCH WITH FLOW-THROUGH PINOUT
PIN CON.IGURATION
CAPACITANCE
(T
A
= +25C, f = 1.0MH
Z
, V
IN
= 0V, V
OUT
= 0V)
NOTE:
1. This parameter is measured at characterization but not tested.
Pins
Typ.
Max.
(1)
Unit
Control Pins
3
5
pF
Quickswitch Channels (Switch OFF)
5
7
pF
Symbol
Description
Max
Unit
V
TERM
(2)
Supply Voltage to Ground
0.5 to +7
V
V
TERM
(3)
DC Switch Voltage Vs
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 (T
A
= 85C)
0.5
W
T
STG
Storage Temperature
65 to +150
C
ABSOLUTE MAXIMUM RATINGS
(1)
NOTE:
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.
48
47
46
45
44
43
41
40
39
42
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
CC
BE1
B
0
B
1
B
2
B
3
B
5
B
6
B
7
B
4
B
8
B
9
V
CC
BE2
B
10
B
11
B
12
B
13
B
14
B
15
B
16
B
17
B
18
B
19
1
NC
2
A
0
A
1
3
A
2
4
A
3
5
A
4
6
8
A
6
9
A
7
10
A
8
7
A
5
11
A
9
12
GND
13
NC
14
A
10
15
A
11
16
A
12
17
A
13
18
A
14
19
A
15
20
A
16
21
A
17
22
A
18
23
A
19
24
GND
QVSOP
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
.UNCTION TABLE
(1)
PIN DESCRIPTION
BE1
BE2
A
0
- A
9
A
10
- A
19
Function
L
L
B
0
- B
9
B
10
- B
19
Connect
L
H
B
0
- B
9
Z
Connect
H
L
Z
B
10
- B
19
Connect
H
H
Z
Z
Disconnect
Pin Names
I/O
Description
A
0
- A
19
I/O
Bus A
B
0
- B
19
I/O
Bus B
BEn
I
Bus Enable
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IDTQS32X2861
HIGH-SPEED CMOS 20-BIT BUS SWITCH WITH FLOW-THROUGH PINOUT
INDUSTRIAL TEMPERATURE RANGE
R
ON
(ohms)
V
IN
(Volts)
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
80
70
60
50
40
30
20
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Level
Guaranteed Logic HIGH for Control Pins
2
--
--
V
V
IL
Input LOW Level
Guaranteed Logic LOW for Control Pins
--
--
0.8
V
I
IN
Input LeakageCurrent (Control Inputs)
(2)
0V
V
IN
V
CC
--
0.01
1
A
I
OZ
Off-State Output Current (Hi-Z)
0V
V
OUT
V
CC
, Switches OFF
--
0.01
1
A
R
ON
(3)
Switch ON Resistance
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
15
20
35
V
CC
= Min., V
IN
= 2.4V, I
ON
=15mA
18
25
40
V
P
Pass Voltage
(2)
V
IN
= V
CC
= 5V, I
OUT
= -5
A
3.7
4
4.2
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5.0V 5%
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25C.
2. Pass Voltage is guaranteed but not production tested.
3. R
OUT
changed on March 8, 2002. See rear page for more information.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32X2861
HIGH-SPEED CMOS 20-BIT BUS SWITCH WITH FLOW-THROUGH PINOUT
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
6
A
I
CC
Power Supply Current per Control Input HIGH
(3)
V
CC
= Max., V
IN
= 3.4V, f = 0
--
2.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(4)
V
CC
= Max., A and B pins open
--
0.25
mA/MHz
BEn Control Input Toggling at 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
= 5.0V, 25C ambient.
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 pins 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 5%;
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min.
(1)
Typ.
Max.
Unit
t
PLH
Data Propagation Delay
(2,3)
--
1.25
--
ns
t
PHL
An to/from Bn
t
PZH
Switch Turn-on Delay
1.5
--
7.5
ns
t
PZL
BEn to An/Bn
t
PHZ
Switch Turn-off Delay
(2)
1.5
--
6.5
ns
t
PLZ
BEn to An/Bn
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 1.25ns for 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
the driven side.
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IDTQS32X2861
HIGH-SPEED CMOS 20-BIT BUS SWITCH WITH FLOW-THROUGH PINOUT
INDUSTRIAL TEMPERATURE RANGE
ORDERING IN.ORMATION
IDTQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C)
48-Pin QVSOP
Q1
32X2861
High Speed CMOS 20-Bit Bus Switch
with Flow-Through Pinout
X
Process
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
Parameter
Description
Min.
Typ.
Max.
Unit
R
ON
V
CC
= Min, V
IN
= 0V, I
ON
= 30mA
--
28
35
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15mA
--
35
40
As per PCN L0201-02, the Output Resistance (R
ON
) specifications have changed as of March 8, 2002. The original specifications were:
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