The QS34X383 provides four sets of eight high-speed CMOS TTL-
compatible bus switches. The low ON resistance (5Ω) 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 -40°C to +85°C.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
A0
C0
A4
C4
B0
D0
B4
D4
A3
C3
A7
C7
B3
D3
B7
D7
BX1
BE1
BX2
BE2
A8
C8
A12
C12
B8
D8
B12
D12
A11
C11
A15
C15
B11
D11
B15
D15
BX3
BE3
BX4
BE4
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-5573/1
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
BE1
C0
A0
B0
D0
C1
A1
B1
D1
G ND
BE2
C4
A4
B4
D4
C5
A5
B5
D5
G ND
BE3
C8
A8
B8
D8
C9
A9
B9
D9
G ND
BE4
C12
A12
B12
D12
C13
A13
B13
D13
G ND
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
D3
B3
A3
C3
D2
B2
A2
C2
BX1
V
CC
D7
B7
A7
C7
D6
B6
A6
C6
BX2
V
CC
D11
B11
A11
C11
D10
B10
A10
C10
BX3
V
CC
D15
B15
A15
C15
D14
B14
A14
C14
BX4
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
(T
A
= +25°C, f = 1.0MH
Z
, V
IN
= 0V, V
OUT
= 0V)
Max.
(1)
8
8
Unit
pF
pF
Control Pins
Quickswitch Channels (Switch OFF)
NOTE:
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names
Ax, Bx
Cx, Dx
BEx
BXx
I/O
I/O
I/O
I
I
Buses A, B
Buses C, D
Bus Switch Enable
Bus Exchange
Description
FUNCTION TABLE
(1)
BEx
H
L
L
BXx
X
L
H
Ax
Z
Cx
Dx
Bx
Z
Dx
Cx
Function
Disconnect
Connect
Exchange
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
MILLIPAQ
TOP VIEW
2
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE 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
Parameter
Input HIGH Level
Input LOW Level
Input LeakageCurrent (Control Inputs)
Off-State Output Current (Hi-Z)
Switch ON Resistance
(2,3)
Test Conditions
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
0V
≤
V
IN
≤
V
CC,
Control Inputs
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
Min.
2
—
—
—
—
—
Typ.
(1)
—
—
—
—
6
12
Max.
—
0.8
±5
±5
8
17
Unit
V
V
µA
µA
Ω
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. 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
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
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE 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.,
BEx
= GND or Vcc, f = 0
V
CC
= Max.,
BEx
= 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-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.
Max.
6
2.5
0.25
Unit
mA
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
t
BX
Q
CI
Data Propagation Delay
(2,3)
AxBx to CxDx, CxDx to AxBx
Switch Turn-on Delay
BEx
to Ax, Bx, Cx, Dx
Switch Turn-off Delay
(2)
BEx
to Ax, Bx, Cx, Dx
Switch Multiplex Delay
(2)
BX to Ax, Bx, Cx, Dx
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.
Parameter
Min.
(1)
—
1.5
1.5
1.5
Typ.
—
—
—
—
Max.
0.25
6.5
5.5
6.5
Unit
ns
ns
ns
ns
4
IDTQS34X383
HIGH-SPEED 32-BIT BUS EXCHANGE SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS
XXXXX
Device Type
XX
Package
X
Process
Blank
Industrial (-40°C to +85°C )
Q3
150 mil M illipaQ
34X383
High Speed 32-Bit Bus Exchange Sw itch in MillipaQ
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