Enhanced N channel FET with no inherent diode to Vcc
Ω
5Ω bidirectional switches connect inputs to outputs
Zero ground bounce
25Ω resistors for low noise
Ω
Undershoot clamp diodes on all switch and control inputs
Two enables control five bits each
Available in QSOP and SOIC packages
The QS32384 provides a set of ten high-speed CMOS, TTL-compatible
bus switches. Two banks of five switches are controlled by independent Bus
Enable (BE) signals. The QS32384 adds an internal series resistor with
each switch to reduce reflection noise in high speed applications. When
closed, the switch acts as the source (series) termination for the driver
connected to it.
The QS32384 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
•
•
•
•
•
•
Hot-swapping, hot-docking
Voltage translation (5V to 3.3V)
Power conservation
Capacitance reduction and isolation
Clock gating
Bus isolation
FUNCTIONAL BLOCK DIAGRAM
A0
B0
A4
B4
A5
B5
A9
B9
BEA
BEB
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2000 Integrated Device Technology, Inc.
APRIL 2000
DSC-5751/1
IDTQS32384
HIGH-SPEED CMOS 10-BIT BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
BEA
B
0
A
0
A
1
B
1
B
2
A
2
A
3
B
3
B
4
A
4
GND
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
V
CC
B
9
A
9
A
8
B
8
B
7
A
7
A
6
B
6
B
5
A
5
BEB
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
0.5
–65 to +150
Unit
V
V
V
V
mA
W
°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. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Pins
Control Inputs
Quickswitch Channels (Switch OFF)
Typ.
3
5
Max.
(1)
5
7
Unit
pF
pF
QSOP/ SOIC
TOP VIEW
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
A
0
- A
9
B
0
- B
9
BEA, BEB
I/O
I/O
I/O
I
Bus A
Bus B
Bus Switch Enable
Description
FUNCTION TABLE
(1)
BEA
H
L
H
L
BEB
H
H
L
L
B
0
- B
4
Z
A
0
- A
4
Z
A
0
- A
4
B
5
- B
9
Z
Z
A
5
- A
9
A
5
- A
9
Function
Disconnect
Connect
Connect
Connect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
2
IDTQS32384
HIGH-SPEED CMOS 10-BIT 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
= 5V ± 5%
Symbol
V
IH
V
IL
I
IN
I
OZ
R
ON
V
P
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Switch ON Resistance
Pass Voltage
(2)
Test Conditions
Guaranteed Logic HIGH for Control Inputs
Guaranteed Logic LOW for Control Inputs
0V
≤
V
IN
≤
V
CC
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
—
—
—
20
20
3.7
Typ.
(1)
Max.
—
—
±0.01
±0.01
28
35
4
—
0.8
±1
±1
40
48
4.2
V
Unit
V
V
µA
µA
Ω
NOTES:
1. Typical values are at V
CC
= 5V and T
A
= 25°C.
2. Pass voltage is guaranteed but not production tested.
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
IDTQS32384
HIGH-SPEED CMOS 10-BIT 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 V
CC
, f = 0
V
CC
= Max., V
IN
= 3.4V, f = 0
V
CC
= Max., A and B Pins Open, Control Inputs Toggling @ 50% Duty Cycle
Max.
1.5
2.5
0.25
Unit
mA
mA
mA/MHz
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per TTL-driven input (V
IN
= 3.4V, control inputs only). A, B, C, and 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
= -40°C to +85°C, V
CC
= 5V ± 5%
C
LOAD
= 50pF, R
LOAD
= 500Ω unless otherwise noted.
Symbol
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
Parameter
Data Propagation Delay
(2)
Ax to Bx, Bx to Ax
Switch Turn-On Delay
BEA, BEB
to Ax, Bx
Switch Turn-Off Delay
(2)
BEA, BEB
to Ax, Bx
Min
.
(1)
1.5
1.5
Typ.
Max.
1.25
(3)
7.5
5.5
Unit
ns
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 at 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
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