2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
®
PRODUCTS 2.5V/
IDTQS3VH16861
3.3V 20-BIT FLOW-THROUGH PIN OUT,
HIGH BANDWIDTH BUS SWITCH
FEATURES:
DESCRIPTION:
• N channel FET switches with no parasitic diode to Vcc
−
Isolation under power-off conditions
−
No DC path to Vcc or GND
−
5V tolerant in OFF and ON state
• 5V tolerant I/Os
• Low R
ON
- 4Ω typical
Ω
• Flat R
ON
characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent R
ON
matching between channels
• Vcc operation: 2.3V to 3.6V
• High bandwidth - up to 500 MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in SSOP and TSSOP packages
The QS3VH16861 HotSwitch with 20-bit flow-though pin out is a high
bandwidth bus switch. The QS3VH16861 has very low ON resistance,
resulting in under 250ps propagation delay through the switch. The switches
are controlled by active low enable (BEx) controls. In the ON state, the
switches can pass signals up to 5V. In the OFF state, the switches offer very
high impedence at the terminals.
The combination of near-zero propagation delay, high OFF impedance,
and over-voltage tolerance makes the QS3VH16861 ideal for high perfor-
mance communications applications.
The QS3VH16861 is characterized for operation from -40°C to +85°C.
APPLICATIONS:
•
•
•
•
•
Hot-swapping
10/100 Base-T, Ethernet LAN switch
Low distortion analog switch
Replaces mechanical relay
ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
A
0
B
0
A
10
B
10
A
9
B
9
A
19
B
19
BE 1
BE2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2001 Integrated Device Technology, Inc.
NOVEMBER 2001
DSC-5875/3
IDTQS3VH16861
2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
NC
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
A
18
A
19
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
V
CC
BE1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
V
CC
BE2
B
10
B
11
B
12
B
13
B
14
B
15
B
16
B
17
B
18
B
19
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
V
TERM(3)
V
AC
I
OUT
T
STG
Description
Supply Voltage to Ground
DC Switch Voltage V
S
DC Input Voltage V
IN
AC Input Voltage (pulse width
≤20ns)
DC Output Current (max. current/pin)
Storage Temperature
Max.
– 0.5 to 4.6
– 0.5 to 5.5
– 0.5 to 5.5
–3
120
-65 to +150
Unit
V
V
V
V
mA
°
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
Symbol
C
IN
C
I/O
C
I/O
Parameter
(1)
Control Inputs
(T
A
= +25 C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Typ.
3
4
8
Max.
5
6
12
Unit
pF
pF
pF
o
Quickswitch Channels (Switch OFF)
Quickswitch Channels (Switch ON)
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
BEx
A
0
- A
19
B
0
- B
19
Bus A
Bus B
Description
Active LOW Bus Enable
FUNCTION TABLE
(1)
BE
1
L
L
BE
2
L
H
L
H
A
0
- A
9
B
0
- B
9
B
0
- B
9
Z
Z
A
10
- A
19
B
10
- B
19
Z
B
10
- B
19
Z
Function
Connect
Connect B
0
- B
9,
Disconnect B
10
- B
19
Disconnect B
0
- B
9,
Connect B
10
- B
19
H
Disconnect
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
SSOP/ TSSOP
TOP VIEW
H
2
IDTQS3VH16861
2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
(1)
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= –40°C to +85°C, V
CC
= 3.3V ± 0.3V
Symbol
V
IH
V
IL
I
IN
I
OZ
I
OFF
R
ON
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Leakage Current (Control Inputs)
Off-State Current (Hi-Z)
Data Input/Output Power Off Leakage
Switch ON Resistance
Test Conditions
Guaranteed Logic HIGH
for Control Inputs
Guaranteed Logic HIGH
for Control Inputs
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
Min.
1.7
2
—
—
—
—
—
I
ON
= 30mA
I
ON
= 15mA
I
ON
= 30mA
I
ON
= 15mA
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
6
7
4
5
Max.
—
—
0.7
0.8
±1
±1
±1
8
9
6
8
Ω
µA
µA
µA
V
Unit
V
≤
V
CC
0V
≤
V
OUT
≤
5V, Switches OFF
V
IN
or V
OUT
0V to 5V, V
CC
= 0V
V
CC
= 2.3V
V
CC
= 3V
V
IN
= 0V
V
IN
= 0V
V
IN
= 2.4V
(Typ. at V
CC
= 2.5V) V
IN
= 1.7V
0V
≤
V
IN
NOTE:
1. Typical values are at V
CC
= 3.3V and T
A
= 25°C, unless otherwise noted.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 3.3V
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
4.0
4.5
5.0
V
IN
(Volts)
3
IDTQS3VH16861
2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
I
CCQ
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
Power Supply Current
(2,3)
per Input HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
V
CC
= Max., V
IN
= 3V, f = 0 per Control Input
V
CC
= 3.3V, A and B Pins Open, Control Inputs
Toggling @ 50% Duty Cycle
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per input driven at the specified level. A and B pins do not contribute to
∆Icc.
3. This parameter is guaranteed but not tested.
4. This parameter represents the current required to switch internal capacitance at the specified frequency. The A and B inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
Min.
—
—
Typ.
1.5
—
Max.
3
30
Unit
mA
µA
See Typical I
CCD
vs Enable Frequency graph below
TYPICAL I
CCD
vs ENABLE FREQUENCY CURVE AT V
CC
= 3.3V
14
12
10
I
CCD
(mA)
8
6
4
2
0
0
2
4
6
8
10
12
14
16
18
20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH16861
2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40°C to +85°C
V
CC
= 2.5 ± 0.2V
(1)
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
f
BEx
Parameter
Data Propagation Delay
(2,3)
A to B or B to A
Switch Turn-On Delay
BEx
to xA or xB
Switch Turn-Off Delay
BEx
to xA or xB
Operating Frequency - Enable
(2,5)
1.5
1.5
8.5
7.5
10
1.5
1.5
8
7.5
20
ns
ns
MHz
Min
.
(4)
Max.
V
CC
= 3.3 ± 0.3V
(1)
Min
.
(4)
Max.
0.2
Unit
ns
0.2
NOTES:
1. See Test Conditions under TEST CIRCUITS AND WAVEFORMS.
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 0.2ns 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
the driven side.
4. Minimums are guaranteed but not production tested.
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