HIGH-SPEED CMOS QUICKSWITCH DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS
HIGH-SPEED CMOS
QUICKSWITCH
DOUBLE-WIDTH BUS SWITCH
.EATURES:
•
•
•
•
•
•
•
Enhanced N channel FET with no inherent diode to Vcc
Dual '245 function
25Ω resistor for low noise
Ω
Low propagation delay, zero ground bounce
Undershoot clamp diodes on all switch and control inputs
TTL-compatible control inputs
Available in 40-pin QVSOP package
IDTQS32X2245
DESCRIPTION:
The QS32X2245 provides a set of 16 high-speed CMOS TTL-compatible
bus switches in a flow-through pinout. The QS32X2245 includes internal
25Ω resistors to reduce reflection noise in high speed applications. The
Output Enable (OEn) signals turn the switches on similar to the
OEn
signal
of the 74'245.
QuickSwitch devices provide an order of magnitude faster speed than
conventional logic devices.
The QS32X2245 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
•
•
•
•
•
•
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Bus switching and isolation
Power conservation
Clock gating
Logic replacement
.UNCTIONAL BLOCK DIAGRAM
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
OE
1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
A
8
A
9
A
10
A
11
A
12
A
13
A
14
A
15
OE
2
B
8
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
B
9
B
10
B
11
B
12
B
13
B
14
B
15
INDUSTRIAL TEMPERATURE RANGE
1
c
2002 Integrated Device Technology, Inc.
MARCH 2002
DSC-5724/2
IDTQS32X2245
HIGH-SPEED CMOS QUICKSWITCH DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CON.IGURATION
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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
QVSOP
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
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
0.92
–65 to +150
Unit
V
V
V
V
mA
W
°C
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
V
CC
OE1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
Vcc
OE2
B
8
B
9
B
10
B
11
B
12
B
13
B
14
B
15
V
TERM
(2)
V
TERM
(3)
V
TERM
(3)
V
AC
I
OUT
P
MAX
T
STG
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
(T
A
= +25°C, f = 1.0MH
Z
, V
IN
= 0V, V
OUT
= 0V)
Pins
Control Pins
Quickswitch Channels (Switch OFF)
Typ.
3
5
Max.
(1)
5
7
Unit
pF
pF
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
OE1, OE2
An
Bn
I/O
I
I/O
I/O
Bus Enable
Bus A
Bus B
Description
.UNCTION TABLE
(1)
OE1
H
L
H
L
OE2
H
H
L
L
A
0
- A
7
Z
B
0
- B
7
Z
B
0
- B
7
A
8
- A
15
Z
Z
B
8
- B
15
B
8
- B
15
Function
Disconnect
Connect
Connect
Connect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
2
IDTQS32X2245
HIGH-SPEED CMOS QUICKSWITCH DOUBLE-WIDTH 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 ±5%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
(3)
V
P
Parameter
Input HIGH Level
Input LOW Level
Off-State Output Current (Hi-Z)
Switch ON Resistance
Pass Voltage
(2)
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
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
—
—
—
18
18
3.7
Typ.
(1)
—
—
±0.01
±0.01
23
25
4
Max.
—
0.8
±1
±1
35
40
4.2
Unit
V
V
µA
µA
Ω
V
Input LeakageCurrent (Control Inputs)
(2)
0V
≤
V
IN
≤
V
CC
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
2. Pass Voltage is guaranteed but not production tested.
3. R
OUT
changed on March 8, 2002. See rear page for more information.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
80
R
ON
(ohms)
70
60
50
40
30
20
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
3
IDTQS32X2245
HIGH-SPEED CMOS QUICKSWITCH DOUBLE-WIDTH 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.
6
1.5
0.25
Unit
µA
mA
mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C, V
CC
= 5.0V ± 5%;
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)
An to/from Bn
Switch Turn-on Delay
OE
to An/Bn
Switch Turn-off Delay
(2)
OE
to An/Bn
0.5
—
4.5
ns
Parameter
Min.
(1)
—
0.5
Typ.
—
—
Max.
1.25
6.6
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 1.25ns 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.
4
IDTQS32X2245
HIGH-SPEED CMOS QUICKSWITCH DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING IN.ORMATION
IDTQS XXXXX
Device Type
XX
Package
X
Process
Blank
Industrial (-40°C to +85°C)
Q2
40-Pin QVSOP
32X2245
High Speed CMOS QuickSwitch Double
Width Bus Switch
As per PCN L0201-02, the Output Resistance (R
ON
) specifications have changed as of March 8, 2002. The original specifications were:
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