1
IDTQS32XR862
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE, ACTIVE HIGH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5540/-
c
IDTQS32XR862
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS 20-BIT LOW
RESISTANCE, ACTIVE HIGH BUS SWITCH
WITH FLOW-THROUGH PINOUT
DESCRIPTION:
The QS32XR862 provides two sets of ten high-speed CMOS, TTL-
compatible, active high, low resistance bus switches. The very low ON
resistance (2.5
) of the QS32XR862 allows inputs to be connected to
outputs without adding propagation delay and without generating additional
ground bounce noise. The switches are controlled by independent active
Low Enable (
BE) and active High Enable (BE) controls for each set.
The QS32XR862 is ideal for switching digital buses as well as for hot plug
buffering and 5V to 3.3V conversion. The low ON resistance of the
QS32XR862 makes it ideal for PCI hot -docking applications.
The QS32XR862 is characterized for operation at -40C to +85C.
A
0
BE
1
B
0
A
9
B
9
BE
1
A
10
BE
2
B
10
A
19
B
19
BE
2
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
-
Active Low and High enable controls
-
Available in 48-pin QVSOP Package
APPLICATIONS
-
Hot-swapping and hot-docking (low R
ON
resistance for PCI and
Compact PCI applications)
-
Voltage translation (5V to 3.3V)
-
Power conservation
-
Capacitance reduction and isolation
-
Applications requiring Low resistance and active High enabling
-
Bus isolation
-
Clock gating
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR862
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE, ACTIVE HIGH BUS SWITCH
PIN CONFIGURATION
GND
B
9
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
1
BE
1
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
1 9
A
1 8
A
1 6
A
1 7
A
1 5
A
1 0
A
1 1
A
1 2
A
1 3
A
1 4
BE
2
GND
B
19
B
18
B
16
B
17
B
15
B
10
B
11
B
12
B
13
B
14
BE
2
Vcc
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.
PIN DESCRIPTION
Pin Names
I/O
Description
BE
I
Active LOW Bus Enable
BE
I
Active HIGH Bus Enable
A
0
- A
19
I/O
Bus A
B
0
- B
19
I/O
Bus B
FUNCTION TABLE
(1)
BE
1
BE
1
A
0
- A
9
Function
L
L
Hi-Z
Disconnect
L
H
Hi-Z
Disconnect
H
L
B
0
- B
9
Connect
H
H
Hi-Z
Disconnect
BE
2
BE
2
A
10
- A
19
Function
L
L
Hi-Z
Disconnect
L
H
Hi-Z
Disconnect
H
L
B
10
- B
19
Connect
H
H
Hi-Z
Disconnect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
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IDTQS32XR862
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE, ACTIVE HIGH 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
BEn,
BEn
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
Vcc = Min., V
IN
= 0V
,
I
ON
= 30mA
--
2.5
5
R
ON
Switch ON Resistance
Vcc = Min., V
IN
= 2.4V
,
I
ON
= 15mA
--
4
8.5
V
P
Pass Voltage
(2)
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. Pass voltage is guaranteed but not production tested.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32XR862
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE, ACTIVE HIGH BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Typ.
(2)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., BEn = GND or Vcc, f = 0
0.2
6
A
I
CC
Power Supply Current per Control Input HIGH
(3)
V
CC
= Max., V
IN
= 3.4V, f = 0
--
2.5
mA
I
CCD
Dynamic Power Supply Current per MHz
(4)
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. Typical values are at V
CC
= 5.0V, T
A
= 25C.
3. Per TLL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
Icc
.
4. 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
(2,3)
An to/from Bn
--
--
0.12
ns
t
PZL
t
PZH
Switch Turn-on Delay
BEn or BEn to An/Bn
1.5
--
5.6
ns
t
PLZ
t
PHZ
Switch Turn-off Delay
(2)
BEn to An/Bn
1.5
--
4.5
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
= 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.
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IDTQS32XR862
HIGH-SPEED CMOS 20-BIT LOW RESISTANCE, ACTIVE HIGH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQ S
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C )
QVSOP
Q1
32XR862
High Speed CM OS 20-Bit Low Resistance, Active High
Bus Switch with Flow-Through Pinout
X
Process
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