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IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
NOVEMBER 1999
1999 Integrated Device Technology, Inc.
DSC-5573/1
c
IDTQS34X383
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FEATURES:
5
switches connect inputs to outputs
Zero propagation delay
Direct bus connect
Live insertion capability
Low power CMOS proprietary technology
Bus exchange allows nibble swap
TTL-compatible control inputs
Available in 80-pin Millipaq package
QUICKSWITCH
PRODUCTS
HIGH-SPEED 32-BIT BUS EXCHANGE
SWITCH IN MILLIPAQ
TM
DESCRIPTION:
The QS34X383 provides four sets of eight high-speed CMOS TTL-
compatible bus switches. The low ON resistance (5
) of the QS34X383
allows inputs to be connected to outputs without adding propagation delay
and without generating additional ground bounce noise. The Bus Enable
(BEx) signals turn the switches on. The Bus Exchange (BXx) signals
provide 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 16-bit 2-to-1 multiplexer and to create low delay barrel shifters, etc.
The QS34X383 is characterized for operation at -40C to +85C.
A 0
B 3
BX 1
BX 2
BE 1
BE 2
B 0
A 3
C0
D3
D0
C3
A 4
B 7
B 4
A 7
C4
D7
D4
C7
A8
B 11
BX 3
BX 4
BE 3
BE 4
B8
A 11
C8
D11
D8
C11
A 12
B 15
B 12
A 15
C12
D15
D12
C15
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INDUSTRIAL TEMPERATURE RANGE
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
PIN CONFIGURATION
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
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
Max.
(1)
Unit
Control Pins
8
pF
Quickswitch Channels (Switch OFF)
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
I/O
Description
Ax, Bx
I/O
Buses A, B
Cx, Dx
I/O
Buses C, D
BEx
I
Bus Switch Enable
BXx
I
Bus Exchange
BEx
BXx
Ax
Bx
Function
H
X
Z
Z
Disconnect
L
L
C x
Dx
Connect
L
H
Dx
C x
Exchange
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
B E1
C0
A0
B0
D0
C1
A1
B1
D1
G ND
B E2
C4
A4
B4
D4
C5
A5
B5
D5
G ND
B E3
C8
A8
B8
D8
C9
A9
B9
D9
G ND
B E4
C12
A 12
B 12
D12
C13
A 13
B 13
D13
G ND
V
C C
D3
B 3
A 3
C3
D2
B 2
A 2
C2
B X1
V
C C
D7
B 7
A 7
C7
D6
B 6
A 6
C6
B X2
V
C C
D11
B 11
A 11
C11
D10
B 10
A 10
C10
B X3
V
C C
D15
B 15
A 15
C15
D14
B 14
A 14
C14
B X4
MILLIPAQ
TOP VIEW
3
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
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,
Control Inputs
--
--
5
A
I
OZ
Off-State Output Current (Hi-Z)
0V
V
OUT
V
CC
, Switches OFF
--
--
5
A
R
ON
Switch ON Resistance
(2,3)
V
CC
= Min., V
IN
= 0V, I
ON
= 30mA
--
6
8
V
CC
= Min., V
IN
= 2.4V, I
ON
=15mA
--
12
17
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 5.0V 5%
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. Measures by voltage drop between the AB and CD pin at the indicated current through the switch. ON resistance is determined by the lower of the voltages on the two
(A or B, C or D) pins.
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
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INDUSTRIAL TEMPERATURE RANGE
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., BEx = GND or Vcc, f = 0
6
mA
I
CC
Power Supply Current per Control Input HIGH
(2)
V
CC
= Max., BEx = 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-D 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
Data Propagation Delay
(2,3)
--
--
0.25
ns
t
PHL
AxBx to CxDx, CxDx to AxBx
t
PZL
Switch Turn-on Delay
1.5
--
6.5
ns
t
PZH
BEx to Ax, Bx, Cx, Dx
t
PLZ
Switch Turn-off Delay
(2)
1.5
--
5.5
ns
t
PHZ
BEx to Ax, Bx, Cx, Dx
t
BX
Switch Multiplex Delay
(2)
1.5
--
6.5
ns
BX to Ax, Bx, Cx, Dx
Q
CI
Charge Injection
(4,5)
--
1.5
--
pC
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 0.25ns 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. Measured at switch turn off, A to C, load = 50pF in parallel with 10 meg scope probe, V
IN
at I = 0V.
5. Measured at switch turn off through bus multiplexer, A to C
A to D, B connected to C, load = 50pF in parallel with 10 meg scope probe, V
IN
at A = 0V. Charge injection
is reduced because the injection from the turn off of the A to C switch is compensated by the turn on of the B to C switch.
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IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE 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
Package
Device Type
Blank
Industrial (-40C to +85C )
150 mil M illipaQ
Q3
34X383
High Speed 32-Bit Bus Exchange Sw itch in MillipaQ
X
Process
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