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IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5544/1
c
IDTQS34XR245
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
QS34XR245Q3 is a 32-bit version of QS3R245
Flow-through pinout for easy layout
Undershoot clamp diodes on all switch and control inputs
TTL-compatible control inputs
Available in 80-pin Millipaq package
APPLICATIONS:
Low resistance applications
Hot-swapping, hot-docking (low resistance for PCI and
Compact PCI applications)
Bus switching, isolation
Logic replacement (data processing)
Capacitance reduction and isolation
Power conservation
Clock gating
Voltage translation (5V to 3.3V)
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS QUICK-
SWITCH 32-BIT LOW RESISTANCE
MULTIWIDTH
TM
BUS SWITCHES
DESCRIPTION:
The QS34XR245 is a member of the MultiWidth
TM
family of QuickSwitch
devices and provides a set of 32 high-speed low resistance CMOS compatible
bus switches in a flow-through pin out.
This device is available in the MillipaQ package, the worlds first small outline
32-bit solution. The low on-resistance of the QS34XR245 allows inputs to be
connected to outputs without adding propagation delay and without generating
additional ground bounce noise. When Output Enable (OEx) is low, the switches
are turned on, connecting bus A to bus B. When OEx is high, the switches are
turned off.
The QS34XR245 is ideally suited for 32/64 bit applications where board
space is at a premium. The low resistance of QS34XR245 makes it ideal for PCI
hot docking application.
QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.
O E1
A
0
B
0
A
1
B
1
A
2
B
2
A
3
B
3
A
4
B
4
A
5
B
5
A
6
B
6
A
7
B
7
O E3
A
16
B
16
A
17
B
17
A
18
B
18
A
19
B
19
A
20
B
20
A
21
B
21
A
22
B
22
A
23
B
23
O E2
A
8
B
8
A
9
B
9
A
10
B
10
A
11
B
11
A
12
B
12
A
13
B
13
A
14
B
14
A
15
B
15
O E4
A
24
B
24
A
25
B
25
A
26
B
26
A
27
B
27
A
28
B
28
A
29
B
29
A
30
B
30
A
31
B
31
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
PIN CONFIGURATION
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
FUNCTION TABLE
(1)
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)
7
8
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)
1.4
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.
PIN DESCRIPTION
Pin Names
Description
OEx
Output Enable
Ax, Bx
Data I/Os
OE1x
Function
H
Disconnect
L
Ax = Bx
A
2
A
10
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
72
73
74
75
76
77
78
79
80
1
GND
GND
25
26
27
28
56
55
54
53
A
6
A
0
A
7
A
8
A
9
A
11
A
12
A
14
A
15
NC
OE3
A
5
A
13
29
30
31
32
33
34
36
35
37
38
A
28
A
31
52
51
50
49
48
47
46
45
44
43
39
42
40
41
A
1
A
3
A
4
A
16
A
21
A
18
GND
A
29
OE2
V
CC
OE1
V
CC
V
CC
V
CC
OE4
A
17
A
20
A
19
A
23
A
22
NC
A
24
A
25
A
26
A
27
A
30
GND
NC
NC
B
2
B
6
B
0
B
7
B
5
B
1
B
3
B
4
B
10
B
8
B
9
B
11
B
12
B
14
B
15
B
13
B
16
B
21
B
18
B
17
B
20
B
19
B
23
B
22
B
28
B
31
B
29
B
24
B
25
B
26
B
27
B
30
MILLIPAQ (Q3)
TOP VIEW
3
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE 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
--
--
1
A
I
OZ
Off-State Output Current (Hi-Z)
0V
V
OUT
V
CC
, Switches OFF
--
--
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
IN
= 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
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INDUSTRIAL TEMPERATURE RANGE
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-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
12
A
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 Inputs Toggling at 50% Duty Cycle
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
Data Propagation Delay
(2,3)
--
--
0.12
ns
t
PHL
Ax to/from Bx
t
PZL
Switch Turn-on Delay
0.5
--
5.6
ns
t
PZH
OE to Ax/Bx
t
PLZ
Switch Turn-off Delay
(2)
0.5
--
4.5
ns
t
PHZ
OE to Ax/Bx
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
= 30pF. 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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IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE 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
IDTQS
XXXXX
XX
X
Package
Process
Device Type
Blank
34XR 245
Industrial (-40C to +85C )
High Speed CM OS 32-Bit Low Resitance
MultiW idth
Bus Sw itch
Q3
80-Pin M illipaQ
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