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IDTQS32XR384
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5548/-
c
IDTQS32XR384
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS 20-BIT LOW
RESISTANCE BUS SWITCH
DESCRIPTION:
The QS32XR384 provides two sets of ten high-speed CMOS TTL-
compatible bus switches. Four banks of five switches are controlled by
independent Bus Enable (
BE) signals. The very low R
ON
resistance (2.5
)
of the QS32XR384 allows inputs to be connected without adding propaga-
tion delay and without generating additional ground bounce noise.
The QS32XR384 is ideal for switching digital buses, as well as for hot
plug buffering and 5V to 3.3V conversion.
The QS32XR384 is characterized for operation at -40C to +85C.
FUNCTIONAL BLOCK DIAGRAM
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 pins
-
Two enables control five bits each
-
Available in 48-pin QVSOP Package
APPLICATIONS
-
Hot-swapping and 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
A
0
B
0
A
4
B
4
B
5
B
9
A
5
A
9
BEC
BEA
A
10
B
10
A
14
B
14
B
15
B
19
A
15
A
19
BED
BEB
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR384
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE BUS SWITCH
PIN CONFIGURATION
G N D
BEB
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 A
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
19
A
18
A
16
A
17
A
15
A
10
A
11
A
12
A
13
A
14
BEC
G N D
BED
B
19
B
16
B
17
B
15
B
10
B
11
B
12
B
13
B
14
Vcc
B
9
B
18
QVSOP
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
Unit
V
TERM(2)
Supply Voltage to Ground
0.5 to +7
V
V
TERM(3)
DC Switch Voltage V
S
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
.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 but not production tested.
FUNCTION TABLE
(1)
BEA
BEB
B
0
- B
4
B
15
- B
19
Function
H
H
Hi-Z
Hi-Z
Disconnect
L
H
A
0
- A
4
Hi-Z
Connect
H
L
Hi-Z
A
15
- A
19
Connect
L
L
A
0
- A
4
A
15
- A
19
Connect
BEC
BED
B
5
- B
9
B
10
- B
14
Function
H
H
Hi-Z
Hi-Z
Disconnect
L
H
A
5
- A
9
Hi-Z
Connect
H
L
Hi-Z
A
10
- A
14
Connect
L
L
A
5
- A
9
A
10
- A
14
Connect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
PIN DESCRIPTION
Pin Names
I/O
Description
A
0
- A
19
I/O
Bus A
B
0
- B
19
I/O
Bus B
BEA
I
Enable, 0-4
BEB
I
Enable, 15-19
BEC
I
Enable, 5-9
BED
I
Enable, 10-14
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IDTQS32XR384
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
R
ON
(ohms)
V
IN
(Volts)
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
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
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
Vcc
--
0.01
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
Vcc, Switches OFF
--
0.01
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
V
P
Pass Voltage
(3)
V
IN
= Vcc = 5V, I
OUT
= -5
A
3.7
4
4.3
V
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.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR384
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or Vcc, f = 0
3
mA
I
CC
Power Supply Current per Control Input HIGH
(2)
V
CC
= Max., V
IN
= 3.4V, f = 0
2.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(3)
V
CC
= Max., A and B pins open
Control Inputs 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. Per TLL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
Icc
.
3. 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
(2,4)
Ax to Bx, Bx to Ax
--
--
0.12
(3)
ns
t
PZL
t
PZH
Switch Turn-on Delay
BEA, BEB to Ax, Bx
1.5
--
6
ns
t
PLZ
t
PHZ
Switch Turn-off Delay
(2)
BEA, BEB to Ax, Bx
1.5
--
4
ns
NOTES:
1. Minimums are 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 0.12ns for C
L
= 50pF.
4. 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 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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IDTQS32XR384
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
CORPORATE HEADQUARTERS
for SALES:
2975 Stender Way
800-345-7015 or 408-727-6116
Santa Clara, CA 95054
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.
IDTQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C )
48-pin QVSOP
Q1
32XR384
High Speed C MOS 20-Bit Low Resistance
Bus Sw itch
X
Process
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