1
IDTQS32XR861
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE ACTIVE LOW BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5542/1
c
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
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 inputs
Available in 48-pin QVSOP package
APPLICATIONS:
Hot-swapping, 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
IDTQS32XR861
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS 20-BIT LOW
RESISTANCE, ACTIVE LOW BUS SWITCH
WITH FLOW-THROUGH PINOUT
DESCRIPTION:
The QS32XR861 provides two sets of ten high-speed CMOS, TTL-
compatible, low resistance bus switches. The very low ON resistance
(2.5
) of the QS32XR861 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).
The QS32XR861 is ideal for switching digital buses, as well as for hot
plug buffering and 5V to 3.3V conversion. The low ON resistance of the
QS32XR861 makes it ideal for PCI hot-docking applications.
The QS32XR831 is characterized for operation at -40C to +85C.
A
0
B
0
A
9
B
9
A
1 0
BE
2
B
10
A
1 9
B
19
BE
1
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR861
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE ACTIVE LOW BUS SWITCH
PIN CONFIGURATION
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
4
pF
Quickswitch Channels (Switch OFF)
5
6
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.
QVSOP
TOP VIEW
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
FUNCTION 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
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
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
1
NC
48
47
46
45
44
43
42
41
40
39
37
36
35
34
33
32
31
30
29
28
27
26
25
38
A
1 9
A
1 8
A
1 6
A
1 7
A
1 5
A
1 0
A
1 1
A
1 2
A
1 3
A
1 4
NC
GND
B
19
B
18
B
16
B
17
B
15
B
10
B
11
B
12
B
13
B
14
BE
2
Vcc
3
IDTQS32XR861
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE ACTIVE LOW BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
R
ON
(ohms)
V
IN
(Volts)
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
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)
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
Switch ON Resistance
(2)
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
--
2.5
5
V
CC
= Min., V
IN
= 2.4V, I
ON
=15mA
--
4
8.5
V
P
Pass Voltage
(3)
V
CC
= 5V, I
OUT
= -5
A
3.7
4
4.3
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5.0V 10%
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.
16
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR861
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE ACTIVE LOW BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Typ
(2)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., BEn = 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
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 10%;
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min.
(1)
Typ.
Max.
Unit
t
PLH
Data Propagation Delay
(2,3)
--
--
0.12
ns
t
PHL
An to/from Bn
t
PZH
Switch Turn-on Delay
1.5
--
5.6
ns
t
PZL
BEn to An/Bn
t
PHZ
Switch Turn-off Delay
(2)
1.5
--
4.5
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 0.12ns 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.
5
IDTQS32XR861
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE ACTIVE LOW BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
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
ID TQ S
XXXXX
XX
Package
D evice Type
Blank
Industrial (-40C to +85C )
Q VSOP
Q1
32XR 861
High Speed C M OS 20-Bit Low Resistance, Active Low
Bus Switch w ith Flow-Through Pinout
X
Process
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