FEATURES/BENEFITS
Enhanced N channel FET with no inherent diode to V
CC
5
W
W
W
W
W
bidirectional switches connect inputs to outputs
Zero propagation delay (QS3L384); zero ground bounce
Undershoot clamp diodes on all switch and control pins
Ultra low power with 0.2A typical I
CC
QS3L2384 is 25
W
W
W
W
W
version for low noise
Two enables control five bits each
QS3L384 available in SOIC, QSOP and TSSOP
QS3L2384 available in SOIC and QSOP
APPLICATIONS
Hot-swapping, hot-docking
(Application Note AN-13)
Voltage translation
(5V to 3.3V; Application Note AN-11)
Power conservation
Capacitance reduction and isolation
Bus isolation
Clock gating
B4
BEB
BEA
B0
A4
A0
B9
B5
A9
A5
DESCRIPTION
The QS3L384 and QS3L2384 provide a set of ten
high-speed CMOS TTL-compatible bus switches. The low ON resis-
tance of the QS3L384 allows inputs to be connected to outputs without
adding propagation delay and without generating additional ground
bounce noise. The Bus Enable (
BE
) signals turn the switches on. Two
bus enable signals are provided, one for each of the upper and lower five
bits of the two 10-bit buses.
The QS3L2384 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.
QS3L384
QS3L2384
QUICKSWITCH
PRODUCTS
HIGH-SPEED LOW POWER CMOS
10-BIT BUS SWITCHES
JULY 1999
1
1999 Integrated Device Technology, Inc
DSC-XXXXXX
FUNCTIONAL BLOCK DIAGRAM
2
1999 Integrated Device Technology, Inc
IDT
QS3L384 AND QS3L2384
DSC-XXXXXX
SOIC, QSOP and TSSOP
Pins
Typ
Max
Unit
Control Inputs
3
5
pF
QuickSwitch Channels
5
7
pF
(Switch OFF)
Name
I/O
Function
A0-A9
I/O
Bus A
B0-B9
I/O
Bus B
BEA
,
BEB
I
Bus Switch Enable
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Supply Voltage to Ground ........................................................................ 0.5V to 7.0V
DC Switch Voltage V
S
.............................................................................. 0.5V to 7.0V
DC Input Voltage V
IN
................................................................................ 0.5V to 7.0V
AC Input Voltage (for a pulse width
20ns) .......................................................... 3.0V
DC Output Current Max. Sink Current/Pin ........................................................... 120mA
Maximum Power Dissipation ............................................................................ 0.5 watts
T
STG
Storage Temperature ...................................................................... 65 to 150C
Note: ABSOLUTE MAXIMUM CONTINUOUS
RATINGS are those values beyond which
damage to the device may occur. Exposure to
these conditions or conditions beyond those
indicated may adversely affect device
reliability. Functional operation under
absolute-maximum conditions in not implied.
CAPACITANCE
T
A
= 25C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V
PIN CONFIGURATION
(ALL PINS TOP VIEW)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
BEA
B0
A0
A1
B1
B2
A2
A3
B3
B4
A4
GND
V
CC
B9
A9
A8
B8
B7
A7
A6
B6
B5
A5
BEB
BEA
BEA
BEA
BEA
BEA
BEB
BEB
BEB
BEB
BEB
B0-B4
B5-B9
Function
H
H
Hi-Z
Hi-Z
Disconnect
L
H
A0-A4
Hi-Z
Connect
H
L
Hi-Z
A5-A9
Connect
L
L
A0-A4
A5-A9
Connect
FUNCTION TABLE
Note:Capacitance is guaranteed but not production
tested. For total capacitance while the switch is ON,
please see Section 1 under "Input and Switch
Capacitance."
1999 Integrated Device Technology, Inc
IDT
QS3L384 AND QS3L2384
DSC-XXXXXX
3
Symbol
Parameter
Test Conditions
Min
Typ
(1)
Max
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH
2.0
--
--
V
for Control Inputs
V
IL
Input LOW Voltage
Guaranteed Logic LOW
--
--
0.8
V
for Control Inputs
| I
IN
|
Input Leakage Current
0
V
IN
V
CC
--
--
1
A
| I
OZ
|
Off-State Current (Hi-Z)
0
V
OUT
V
CC
--
0.001
1
A
R
ON
Switch ON Resistance
(2)
V
CC
= Min.,
3L384 (Com)
--
5
7
W
V
IN
= 0.0V
3L384 (Mil)
--
10
15
I
ON
= 30mA
3L2384 (Com)
20
28
40
3L2384 (Mil)
--
35
45
R
ON
Switch ON Resistance
(2)
V
CC
= Min.,
3L384 (Com)
--
10
15
W
V
IN
= 2.4V
3L384 (Mil)
--
15
20
I
ON
= 15mA
3L2384 (Com)
20
35
48
3L2384 (Mil)
--
40
55
V
P
Pass Voltage
(3)
V
IN
= V
CC
= 5V, I
OUT
= 5A
3.7
4
4.2
V
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Commercial: T
A
= 40C to 85C, V
CC
= 5.0V 5%
Military: T
A
= 55C to 125C, V
CC
= 5.0V 10%
Notes:
1. Typical values indicate V
CC
= 5.0V and T
A
= 25C.
2. For a diagram explaining the procedure for R
ON
measurement, please see Section 1 under" DC Electrical Characteristics." Max. value of R
ON
guaranteed, but not production
tested.
3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE VS V
IN
AT V
CC
= 5.0V (QS3L384)
Note: For QS3L2384, add 23
W
to R
ON
shown.
16
14
12
10
8
6
4
2
0
R
ON
(ohms)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
V
IN
(Volts)
4
1999 Integrated Device Technology, Inc
IDT
QS3L384 AND QS3L2384
DSC-XXXXXX
QS3L384
QS3L2384
Symbol
Description
(1)
Min
Typ
Max
Min
Typ
Max
Unit
t
PLH
Data Propagation Delay
(2,4)
COM
--
--
0.25
(3)
--
--
1.25
(3)
ns
t
PHL
Ai to Bi, Bi to Ai
MIL
--
--
0.75
(3)
--
--
1.75
(3)
t
PZL
Switch Turn-on Delay
COM
1.5
--
6.5
1.5
--
7.5
ns
t
PZH
BEA
,
BEB
to Ai, Bi
MIL
1.5
--
7.5
1.5
--
8.5
t
PLZ
Switch Turn-off Delay
(2)
COM
1.5
--
5.5
1.5
--
5.5
ns
t
PHZ
BEA
,
BEB
to Ai, Bi
MIL
1.5
--
6.5
1.5
--
6.5
POWER SUPPLY CHARACTERISTICS OVER OPERATING RANGE
Commercial: T
A
= 40C to 85C, V
CC
= 5.0V 5%
Military: T
A
= 55C to 125C, V
CC
= 5.0V 10%
C
LOAD
= 50pF, R
LOAD
= 500
W
unless otherwise noted.
Symbol
Parameter
Test Conditions
(1)
Typ
(2)
Max
Unit
I
CCQ
Quiescent Power
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
0.2
3.0
A
Supply Current
D
I
CC
Power Supply Current
V
CC
= Max., V
IN
= 3.4V, f = 0
--
2.5
mA
per Input HIGH
(3)
per Control Input
Q
CCD
Dynamic Power Supply
V
CC
= Max., A and B Pins Open, Control
--
0.25
mA/
Current per MHz
(4)
Inputs Toggling @ 50% Duty Cycle
MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
Commercial: T
A
= 40C to 85C, V
CC
= 5.0V 5%
Military: T
A
= 55C to 125C, V
CC
= 5.0V 10%
C
LOAD
= 50pF, R
LOAD
= 500
W
unless otherwise noted.
Notes:
1. See Test Circuit and Waveforms. Minimums 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 QS3L384 and 1.25ns for QS3L2384 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/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.
Notes:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC specifications.
2. Typical values are at V
CC
= 5V, 25C ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only). A and B pins do not contribute to
D
I
CC
.
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.
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