HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS QUICK-
SWITCH 32-BIT LOW RESISTANCE
MULTIWIDTH
TM
BUS SWITCHES
FEATURES:
•
•
•
•
•
•
•
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IDTQS34XR245
Enhanced N channel FET with no inherent diode to Vcc
2.5Ω bidirectional switches connect inputs to outputs
Ω
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
DESCRIPTION:
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)
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.
FUNCTIONAL BLOCK DIAGRAM
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
OE1
OE3
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
OE2
OE4
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
B
24
B
25
B
26
B
27
B
28
B
29
B
30
B
31
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5544/1
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
NC
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
GND
NC
A
16
A
17
A
18
A
19
A
20
A
21
A
22
A
23
GND
NC
A
24
A
25
A
26
A
27
A
28
A
29
A
30
A
31
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
V
CC
OE1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
V
CC
OE2
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
V
CC
OE3
B
16
B
17
B
18
B
19
B
20
B
21
B
22
B
23
V
CC
OE4
B
24
B
25
B
26
B
27
B
28
B
29
B
30
B
31
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
Description
Supply Voltage to Ground
DC Switch Voltage Vs
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤
20ns)
DC Output Current
Maximum Power Dissipation (T
A
= 85°C)
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
1.4
–65 to +150
Unit
V
V
V
V
mA
W
°C
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.
CAPACITANCE
Pins
Control Pins
(T
A
= +25°C, f = 1.0MH
Z
, V
IN
= 0V, V
OUT
= 0V)
Typ.
3
7
Max.
(1)
4
8
Unit
pF
pF
Quickswitch Channels (Switch OFF)
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
OEx
Ax, Bx
Output Enable
Data I/Os
Description
FUNCTION TABLE
(1)
OE1x
H
L
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Function
Disconnect
Ax = Bx
MILLIPAQ (Q3)
TOP VIEW
2
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 5.0V ±10%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
V
P
Parameter
Input HIGH Level
Input LOW Level
Input LeakageCurrent (Control Inputs)
Off-State Output Current (Hi-Z)
Switch ON Resistance
(2)
Pass Voltage
(3)
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
0V
≤
V
IN
≤
V
CC
0V
≤
V
OUT
≤
V
CC
, Switches OFF
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
V
CC
= Min., V
IN
= 2.4V, I
ON
=15mA
V
IN
= V
CC
= 5V, I
OUT
= -5µA
Min.
2
—
—
—
—
—
3.7
Typ.
(1)
—
—
—
—
2.5
4
4
Max.
—
0.8
±1
±1
5
8.5
4.3
Unit
V
V
µA
µA
Ω
V
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
2. Max value of R
ON
is guaranteed but not production tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
16
R
ON
(ohms)
14
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
3
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current per Control Input HIGH
(2)
Dynamic Power Supply Current per MHz
(3)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or Vcc, f = 0
V
CC
= Max., V
IN
= 3.4V, f = 0
V
CC
= Max., A and B pins open
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.
Max.
12
2.5
0.25
Unit
µA
mA
mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5.0V ± 10%;
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise noted.
Symbol
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
Data Propagation Delay
(2,3)
Ax to/from Bx
Switch Turn-on Delay
OE
to Ax/Bx
Switch Turn-off Delay
(2)
OE
to Ax/Bx
0.5
—
4.5
ns
Parameter
Min.
(1)
—
0.5
Typ.
—
—
Max.
0.12
5.6
Unit
ns
ns
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.
4
IDTQS34XR245
HIGH SPEED CMOS QUICKSWITCH 32-BIT LOW RESISTANCE BUS SWITCH
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