1
IDTQS32X383
HIGH-SPEED CMOS 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5572/-
c
IDTQS32X383
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
HIGH-SPEED CMOS
20-BIT BUS EXCHANGE SWITCH
DESCRIPTION:
The QS32X383 provides two sets of ten high-speed CMOS TTL-
compatible bus switches. The low ON resistance (5
) of the QS32X383
allows inputs to be connected to outputs without adding propagation delay
and without generating additional ground bounce noise. The Bus Enable
(
BE) signal turns the switches on. The Bus Exchange (BX) signal provides
nibble swap of the AB and CD pairs of signals. This exchange configuration
allows byte swapping of buses in systems. It can also be used as a 10-wide
2-to-1 multiplexer and to create low delay barrel shifters, etc.
The QS32X383 is characterized for operation at -40C to +85C.
A 4
C 4
D 4
B 4
B X A
B E A
A 0
C 0
D 0
B 0
A 9
C 9
D 9
B 9
B X B
B E B
A 5
C 5
D 5
B 5
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
-
Enhanced N channel FET with no inherent diode to Vcc
-
5
bidirectional switches connect inputs to outputs
-
Zero propagation delay
-
Zero ground bounce
-
Undershoot clamp diodes on all switch and control pins
-
20-bit Double-Width format
-
Bus exchange allows nibble swap
-
Zero ground bounce iin flow-through mode
-
TTL-compatible input and output levels
-
Available in 48-pin QVSOP Package (Q1)
APPLICATIONS
-
Resource sharing
-
Crossbar switching
-
Hot-docking
-
Voltage translation (5V to 3.3V)
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32X383
HIGH-SPEED CMOS 20-BIT BUS EXCHANGE SWITCH
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
BEA
C0
A0
B0
D0
C1
A1
B1
D1
C2
A2
G ND
BEB
C5
A5
B5
D5
C6
A6
B6
D6
C7
A7
G ND
D4
B4
A4
C4
D3
B3
A3
C3
D2
B2
BXA
V
C C
D9
B9
A9
C9
D8
B8
A8
C8
D7
B7
BXB
V
CC
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 (T
A
= 85
C)
0.5
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
5
pF
Quickswitch Channels (Switch OFF)
5
7
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
I/O
Description
Ax, Bx
I/O
Buses A, B
Cx, Dx
I/O
Buses C, D
BEn
I
Bus Switch Enable
BXn
I
Bus Exchange
FUNCTION TABLE
(1)
BEA
BXA
A
0
- A
4
B
0
- B
4
Function
H
X
Hi-Z
Hi-Z
Disconnect
L
L
C
0
- C
4
D
0
- D
4
Connect
L
H
D
0
- D
4
C
0
- C
4
Exchange
BEB
BXB
A
5
- A
9
B
5
- B
9
Function
H
X
Hi-Z
Hi-Z
Disconnect
L
L
C
5
- C
9
D
5
- D
9
Connect
L
H
D
5
- D
9
C
5
- C
9
Exchange
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't care
Z = High-Impedence
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IDTQS32X383
HIGH-SPEED CMOS 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
R
ON
(ohms)
V
IN
(Volts)
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 5V
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 5%
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
V
IN
Vcc, Control Inputs
--
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
(2)
Vcc = Min., V
IN
= 0V
,
I
ON
= 30mA
--
6
8
R
ON
Switch ON Resistance
(2)
Vcc = Min., V
IN
= 2.4V
,
I
ON
= 15mA
--
12
17
V
P
Pass Voltage
(3)
Vcc = 5V, I
OUT
= -5
A
3.7
4
4.2
V
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.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS32X383
HIGH-SPEED CMOS 20-BIT BUS EXCHANGE 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
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
Control Input 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. 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 5%
C
LOAD
= 50pF, R
LOAD
= 500
unless otherwise noted.
Symbol
Parameter
Min.
(1)
Typ.
Max.
Unit
t
PLH
t
PHL
Data Propagation Delay
(2,4)
AxBx to CxDx, CxDx to AxBx
--
--
0.25
(3)
ns
t
PZL
t
PZH
Switch Turn-on Delay
BE to Ax, Bx, Cx, Dx
1.5
--
6.5
ns
t
PLZ
t
PHZ
Switch Turn-off Delay
(2)
BE to Ax, Bx, Cx, Dx
1.5
--
5.5
ns
t
BX
t
PHZ
Switch Multiplex Delay
(2)
BX to Ax, Bx, Cx, Dx
1.5
--
6.5
ns
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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IDTQS32X383
HIGH-SPEED CMOS 20-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
ID TQS
XXXXX
XX
Package
Device Type
Blank
Industrial (-40C to +85C)
48-Pin QVSOP
Q1
32X383
High Speed C M OS 20-Bit Bus Exchange Sw itch
X
Process
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for SALES:
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www.idt.com*
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The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc.
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