1
INDUSTRIAL TEMPERATURE RANGE
IDTQS32X384
HIGH-SPEED CMOS 20-BIT BUS SWITCH
APRIL 2002
2002 Integrated Device Technology, Inc.
DSC-5729/1
c
INDUSTRIAL TEMPERATURE RANGE
DESCRIPTION:
The QS32X384 provides a set of twenty high-speed CMOS TTL-
compatible bus switches. The low ON resistance of the QS32X384 allows
inputs to be connected to outputs without adding propagation delay and
without generating additional ground bounce noise. The Bus Enable (BE)
signals turn the switches on. Four Bus Enable signals are provided, one
for each of five bits of the 20-bit bus. The `384 family of QuickSwitch products
is ideal for switching wide digital buses, as well as hotplug buffering, and 5V
to 3V conversion.
The QS32X384 is characterized for operation at -40C to +85C.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Power conservation
Capacitance reduction and isolation
Bus isolation
Clock gating
FEATURES:
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
Four enables control five bits each
TTL-compatible input and output levels
Available in 48-pin QVSOP package
IDTQS32X384
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
20-BIT BUS SWITCH
FUNCTIONAL BLOCK DIAGRAM
B
4
BEC
BEA
B
0
A
4
A
0
B
9
B
5
A
9
A
5
B
14
BEB
BED
B
10
A
14
A
10
B
19
B
15
A
19
A
15
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS32X384
HIGH-SPEED CMOS 20-BIT BUS SWITCH
PIN CONFIGURATION
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 (T
A
= 85C)
0.5
W
T
STG
Storage Temperature
65 to +150
C
ABSOLUTE MAXIMUM RATINGS
(1)
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. V
CC
terminals.
3. All terminals except V
CC
.
QVSOP
TOP VIEW
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
X = Don't care
Z = High-Impedence
Pins
Typ.
Max.
(1)
Unit
Control Inputs
3
5
pF
Quickswitch Channels (Switch OFF)
5
7
pF
CAPACITANCE
(T
A
= +25C, F = 1MHz, V
IN
= 0V, V
OUT
= 0V)
NOTE:
1. This parameter is guaranteed but not production tested.
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
1
48
BEA
V
CC
2
47
B
0
B
19
3
46
A
0
A
19
4
45
A
1
A
18
5
44
B
1
B
18
6
43
B
2
B
17
8
41
A
3
A
16
9
40
B
3
B
16
10
39
B
4
B
15
7
42
A
2
A
17
11
38
A
4
A
15
12
37
GND
BEB
13
36
BEC
V
CC
14
35
B
5
B
14
15
34
A
5
A
14
16
33
A
6
A
13
17
32
B
6
B
13
18
31
B
7
B
12
19
30
A
7
A
12
20
29
A
8
A
11
21
28
B
8
B
11
22
27
B
9
B
10
23
26
A
9
A
10
24
25
GND
BED
3
INDUSTRIAL TEMPERATURE RANGE
IDTQS32X384
HIGH-SPEED CMOS 20-BIT BUS SWITCH
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
= 5V 5%
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25C.
2. 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
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH for Control Inputs
2
--
--
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW for Control Inputs
--
--
0.8
V
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
V
CC
--
0.01
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
V
CC
, Switches OFF
--
0.01
1
A
R
ON
Switch ON Resistance
V
CC
= Min, V
IN
= 0V, I
ON
= 30mA
--
5
7
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15mA
--
10
15
V
P
Pass Voltage
(2)
V
CC
= 5V, I
OUT
= -5A
3.7
4
4.2
V
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS32X384
HIGH-SPEED CMOS 20-BIT BUS SWITCH
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TTL 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.
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
, 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,
0.25
mA/MHz
Control Input Toggling at 50% Duty Cycle
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
(2,4)
--
--
0.25
(3)
ns
t
PHL
Ax to Bx, Bx to Ax
t
PZL
Switch Turn-on Delay
1.5
--
6.5
ns
t
PZH
BEn
to Ax, Bx
t
PLZ
Switch Turn-off Delay
(2)
1.5
--
5.5
ns
t
PHZ
BEn
to Ax, Bx
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 0.25ns 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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INDUSTRIAL TEMPERATURE RANGE
IDTQS32X384
HIGH-SPEED CMOS 20-BIT BUS SWITCH
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
4/8/2002
Changed Pin layout diagram
DATA SHEET DOCUMENT HISTORY
IDTQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C)
48-Pin QVSOP
Q1
32X384
High Speed CMOS 20-Bit Bus Switch
X
Process
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