HIGH-PERFORMANCE CMOS ANALOG FOUR-CHANNEL SPDT MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS
HIGH-PERFORMANCE CMOS
ANALOG FOUR-CHANNEL
SPDT MUX/DEMUX
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IDTQS4A205
FEATURES:
Low ON resistance: r
DS
(
ON
) = 5Ω
Ω
Fast transition time: t
TRAN
= 6ns
Wide bandwidth: 830MHz (-3dB point)
Crosstalk: -115dB at 50KHz, -100dB at 5MHz, -66dB at 30MHz
Off-isolation: -90dB at 50KHz, -60dB at 5MHz, -50dB at 30MHz
Single 5V supply
Can be used as multiplexer or demultiplexer
TTL-compatible control inputs
Ultra-low quiescent current: 3µA
µ
Available in QSOP package
DESCRIPTION:
APPLICATIONS:
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High-speed video signal switching/routing
HDTV-quality video signal routing
Audio signal switching/routing
Data acquisition
ATE systems
Telecomm routing
Switch between multiple video sources
Token Ring transceivers
High-speed networking
The QS4A205 is a high-performance CMOS analog Four-Channel
SPDT multiplexer/demultiplexer with individual enables. The low On-
resistance of the QS4A205 allows inputs to be connected to outputs with low
insertion loss and high bandwidth. TTL-compatible control circuitry with
“Break-Before-Make” feature prevents contention.
The QS4A205 with 830MHz bandwidth makes it ideal for high-perfor-
mance video signal switching, audio signal switching, and telecomm routing
applications. High performance and low power dissipation makes this
device ideal for battery operated and remote instrumentation applications.
The QS4A205 is offered in the QSOP package and has several advan-
tages over conventional packages such as PDIP and SOIC including:
• Reduced signal delays due to denser component packaging on circuit
boards
• Reduced system noise due to less pin inductance resulting in lower
ground bounce
The QS4A205 is characterized for operation at -40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
I0A
YA
I1A
I0B
I1B
I0C
YC
I1C
I0D
I1D
YD
YB
S
E
CO NTROL
LOG IC
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2000 Integrated Device Technology, Inc.
AUGUST 2000
DSC-5551/2
IDTQS4A205
HIGH-PERFORMANCE CMOS ANALOG FOUR-CHANNEL SPDT MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
S
I0A
I1A
YA
I0B
I1B
YB
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
E
I0D
I1D
YD
I0C
I1C
YC
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 V
S
Analog Input Voltage
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current
Maximum Power Dissipation
Storage Temperature
Max
–0.5 to +7
–0.5 to +7
–0.5 to +7
–0.5 to +7
–3
120
0.7
–65 to +150
Unit
V
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)
QSOP
TOP VIEW
Symbol
C
MUX (OFF)
Parameter
(1)
MUX Off
Capacitance
Conditions
E
= V
CC
, V
IN
= V
OUT
= 0V
E
= V
CC
, V
IN
= V
OUT
= 0V
E
= 0V, V
IN
= V
OUT
= 0V
E
= 0V, V
IN
= V
OUT
= 0V
Typ. Max. Unit
5.6
7.4
12
15
−
−
−
−
pF
pF
pF
pF
C
DEMUX (OFF)
DEMUX Off
Capacitance
C
MUX (ON)
C
DEMUX (ON)
MUX On
Capacitance
DEMUX On
Capacitance
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
IxA
IxB
IxC
IxD
E
S
YA-YD
I/O
I/O
I/O
I/O
I/O
I
I
I/O
Description
Demux Port A
Demux Port B
Demux Port C
Demux Port D
Enable Input
Select Input
Mux Port A-D
FUNCTION TABLE
(1)
Enable
E
H
L
L
Select
S
X
L
H
YA
Z
I0A
I1A
MUX/DEMUX Ports
YB
Z
I0B
I1B
YC
Z
I0C
I1C
YD
Z
I0D
I1D
Function
Disable
Select 0
Select 1
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
2
IDTQS4A205
HIGH-PERFORMANCE CMOS ANALOG FOUR-CHANNEL SPDT MUX/DEMUX
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
Analog Switch
V
IN
r
DS
(
ON
)
I
C(OFF)
I
C(ON)
Analog Signal Range
(2)
Drain-source ON resistance
(2,3)
Channel Off Leakage Current
Channel On Leakage Current
Vcc = Min., V
IN
= 0V, I
ON
= 30mA
Vcc = Min., V
IN
= 2.4V, I
ON
= 15mA
I
N
= Vcc or 0V; Y
N
= 0V or Vcc;
E
= Vcc
I
N
= Y
N
= 0V
(each channel is turned on sequentially)
Digital Control
V
IH
V
IL
t
TRANS
t
ON(EN)
t
OFF(EN)
t
PD
f
3dB
X
TALK
Q
CI
Input HIGH Voltage
Input LOW Voltage
Switching Time of MUX S to Y
Enable Turn-On Time,
E
to Y
Enable Turn-Off Time,
E
to Y
Group Delay
(2,4)
-3dB Bandwidth
Off-isolation
Crosstalk
Charge Injection
Guaranteed Logic HIGH for Control Pins
Guaranteed Logic LOW for Control Pins
R
L
= 1KΩ, C
L
= 100pF
R
L
= 1KΩ, C
L
= 100pF
R
L
= 1KΩ, C
L
= 100pF
R
L
= 1KΩ, C
L
= 100pF
V
IN
= 1Vp-p, R
L
= 75Ω
V
IN
= 1Vp-p, R
L
= 75Ω, f = 5MHz
V
IN
= 1Vp-p, R
L
= 75Ω, f = 5MHz
2
—
0.5
0.5
0.5
—
—
—
—
—
—
—
—
—
—
—
830
-60
-100
1.5
—
0.8
6.6
6
6
250
—
—
—
—
V
V
ns
ns
ns
ps
MHz
dB
dB
pC
–0.5
—
—
—
—
1
5
13
2
2
Vcc - 1
7
17
—
—
nA
nA
V
Ω
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
Dynamic Characteristics
NOTES:
1. Typical values are at V
CC
= 5.0V, T
A
= 25°C.
2. Max value is guaranteed but not production tested.
3. Measured by voltage drop between A and C pins or B and D pins at indicated current through the switch. ON resistance is determined by the lower of the voltages on the
two (A, C, or B, D) pins.
4. The bus switch contributes no group delay other than the RC delay of the ON resistance of the switch and load capacitance. Group 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.
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
Parameter
Quiescent Power
Test Conditions
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
Max.
3
Unit
µA
3
IDTQS4A205
HIGH-PERFORMANCE CMOS ANALOG FOUR-CHANNEL SPDT MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
TYPICAL CHARACTERISTICS
150
V
CC
= 5 V
R
L
= 75
60
V
CC
= 5V
R
L
= 75
Ω
120
50
90
(dB)
(dB )
40
Crosstalk
Off-isolation
60
Crosstalk
30
O ff-isolation
20
30
10
0
1K
10K
100K
1M
10M
100M
1G
0
100M 200M
300M
400M
500M
600M 700M
Frequency (H z)
Freque ncy (H z)
Off-isolation and Crosstalk vs. Frequency
NOTES:
1. Crosstalk = 20 log |V
O
/V
S
|
2. Off-isolation = 20 log |V
O
/V
S
|
Off-isolation and Crosstalk vs. Frequency
NOTES:
1. Crosstalk = 20 log |V
O
/V
S
|
2. Off-isolation = 20 log |V
O
/V
S
|
160
Crosstalk
V
CC
= 5V
R
L
= 75
Ω
4
140
2
R
L
= 1K
Ω
120
(dB )
0
(dB)
Off-isolation
100
2
R
L
= 75
Ω
V
CC
= 5V
80
4
60
6
40
10K
20K
30K
40K
50K
60K
70K
1K
10K
100K
1M
10M
100M
1G
Frequency (H z)
Frequency (H z)
Off-isolation and Crosstalk vs. Frequency
NOTES:
1. Crosstalk = 20 log |V
O
/V
S
|
2. Off-isolation = 20 log |V
O
/V
S
|
Insertion Loss vs. Frequency
NOTE:
1. Insertion Loss = 20 log |V
O
/V
S
|
4
IDTQS4A205
HIGH-PERFORMANCE CMOS ANALOG FOUR-CHANNEL SPDT MUX/DEMUX
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