1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
MARCH 2002
2002 Integrated Device Technology, Inc.
DSC-5884/3
c
INDUSTRIAL TEMPERATURE RANGE
.UNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The QS3VH16212 Bus Exchange HotSwitch with 24-bits is a high
bandwidth bus switch. The QS3VH16212 has very low ON resistance,
resulting in under 250ps propagation delay through the switch. The device
operates as a 24-bit bus switch or a 12-bit bus exchanger, which provides
data exchanging between the four signal ports through the data-select (S
0
- S
2
) terminals. In the OFF and ON states, the switches are 5V-tolerant. 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 QS3VH16212 ideal for high perfor-
mance communications applications.
The QS3VH16212 is characterized for operation from -40
C to +85
C.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
.EATURES:
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
- 4
typical
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
APPLICATIONS:
Hot-swapping
10/100 Base-T, Ethernet LAN switch
Low distortion analog switch
Replaces mechanical relay
ATM 25/155 switching
IDTQS3VH16212
PRELIMINARY
QUICKSWITCH
PRODUCTS
2.5V / 3.3V 24-BIT BUS
EXCHANGE HIGH BANDWIDTH
BUS SWITCH
1A1
1A2
1B2
1B1
S0
S1
S2
Flow C ontrol
1 of 12 C hannels
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
Unit
V
TERM(2)
Supply Voltage to Ground
0.5 to 4.6
V
V
TERM(3)
DC Switch Voltage V
S
0.5 to 5.5
V
V
TERM(3)
DC Input Voltage V
IN
0.5 to 5.5
V
V
AC
AC Input Voltage (pulse width
20ns)
3
V
I
OUT
DC Output Current (max. current/pin)
120
mA
T
STG
Storage Temperature
-65 to +150
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
.
PIN CON.IGURATION
SSOP/ TSSOP
TOP VIEW
CAPACITANCE
(T
A
= +25
o
C, f = 1MHz, V
IN
= 0V, V
OUT
= 0V)
Symbol
Parameter
(1)
Typ.
Max.
Unit
C
IN
Control Inputs
3
5
pF
C
I/O
Quickswitch Channels (Switch OFF)
6
8
pF
C
I/O
Quickswitch Channels (Switch ON)
12
16
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
I/O
Description
1
Ax -
12
Ax
I/O
Bus A
1
Bx -
12
Bx
I/O
Bus B
S
0
- S
2
I
Data Select
.UNCTION TABLE
(1)
S
2
S
1
S
0
xA
1
xA
2
Function
L
L
L
Z
Z
Disconnect
L
L
H
xB
1
Z
xA
1
to xB
1
L
H
L
xB
2
Z
xA
1
to xB
2
L
H
H
Z
xB
1
xA
2
to xB
1
H
L
L
Z
xB
2
xA
2
to xB
2
H
L
H
Z
Z
Disconnect
H
H
L
xB
1
xB
2
xA
1
to xB
1
, xA
2
to xB
2
H
H
Z
xB
2
xB
1
xA
1
to xB
2
, xA
2
to xB
1
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
S1
S2
1B1
1B2
2B1
2B2
3B1
GND
3B2
4B1
4B2
5B1
5B2
6B1
6B2
7B1
7B2
8B1
GND
8B2
9B1
9B2
10B1
10B2
11B1
11B2
12B1
12B2
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
S0
1A1
1A2
2A1
2A2
3A1
3A2
GND
4A1
4A2
5A1
5A2
6A1
6A2
7A1
7A2
V
CC
8A1
GND
8A2
9A1
9A2
10A1
10A2
11A1
11A2
12A1
12A2
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
3
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
(1)
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 3.3V 0.3V
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH
V
CC
= 2.3V to 2.7V
1.7
--
--
V
for Control Inputs
V
CC
= 2.7V to 3.6V
2
--
--
V
IL
Input LOW Voltage
Guaranteed Logic HIGH
V
CC
= 2.3V to 2.7V
--
--
0.7
V
for Control Inputs
V
CC
= 2.7V to 3.6V
--
--
0.8
I
IN
Input Leakage Current (Control Inputs)
0V
V
IN
V
CC
--
--
1
A
I
OZ
Off-State Current (Hi-Z)
0V
V
OUT
5V, Switches OFF
--
--
1
A
I
OFF
Data Input/Output Power Off Leakage
V
IN
or V
OUT
0V to 5V, V
CC
= 0V
--
--
1
A
V
CC
= 2.3V
V
IN
= 0V
I
ON
= 30mA
--
6
8
R
ON
Switch ON Resistance
(Typ. at V
CC
= 2.5V) V
IN
= 1.7V
I
ON
= 15mA
--
7
9
V
CC
= 3V
V
IN
= 0V
I
ON
= 30mA
--
4
6
V
IN
= 2.4V
I
ON
= 15mA
--
5
8
NOTE:
1. Typical values are at V
CC
= 3.3V and T
A
= 25C, unless otherwise noted.
TYPICAL ON RESISTANCE vs V
IN
AT V
CC
= 3.3V
R
ON
(ohms)
V
IN
(Volts)
16
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
5.0
4.5
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
POWER SUPPLY CHARACTERISTICS
Symbol
Parameter
Test Conditions
(1)
Min.
Typ.
Max.
Unit
I
CCQ
Quiescent Power Supply Current
V
CC
= Max., V
IN
= GND or V
CC
, f = 0
--
1.5
3
mA
I
CC
Power Supply Current
(2,3)
per Input HIGH
V
CC
= Max., V
IN
= 3V, f = 0 per Control Input
--
--
30
A
I
CCD
Dynamic Power Supply Current
(4)
V
CC
= 3.3V, A and B Pins Open, Control Inputs
See Typical I
CCD
vs Enable Frequency graph below
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.
TYPICAL I
CCD
vs ENABLE .REQUENCY CURVE AT V
CC
= 3.3V
I
CCD
(mA)
ENABLE FREQUENCY (MHz)
0
2
4
6
8
10
12
14
16
18
20
0
2
4
6
8
10
12
14
16
18
20
5
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
T
A
= -40C to +85C
V
CC
= 2.5 0.2V
(1)
V
CC
= 3.3 0.3V
(1)
Symbol
Parameter
Min
.
(4)
Max.
Min
.
(4)
Max.
Unit
t
PLH
Data Propagation Delay
(2,3)
0.2
0.2
ns
t
PHL
xAx to xBx or xBx to xAx
t
PZH
Switch Turn-On Delay
1.5
11.5
1.5
11
ns
t
PZL
Sx to xAx, xBx
t
PHZ
Switch Turn-Off Delay
1.5
11
1.5
10.5
ns
t
PLZ
Sx to xAx, xBx
t
PSX
Propagation Delay
1.5
11
1.5
9
ns
Sx to xAx, xBx
f
Sx
Operating Frequency - Enable
(2,5)
10
20
MHz
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.
5. Maximum toggle frequency for
Sx control input (pass voltage > V
CC
, V
IN
= 5V, R
LOAD
> 1M
, no C
LOAD
).
6
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
PHY
3VH
SWITCH
4.5V
PP
LOGIC
SIDE
Z = 100
10M bps to 100Mbps
2V
PP
4.5V
PP
LOGIC
SIDE
Z = 100
TWISTED PAIR
>100m
CHARGE PUMP
OE
Vcc = 3.3V
0 to +5V
NFET
+6.5V
DRIVER
0 to +5V
SINGLE HOT
SWITCH
CARD I/O
ON CARD
LOGIC
CO
NN
E
C
T
O
R
QS
3
V
H
X
X
X
CPU
RAM
BUS
CARD I/O
ON CARD
LOGIC
CO
NN
E
C
T
O
R
QS
3
V
H
X
X
X
PLUGGABLE CARD/ LIVE SYSTEM
ZERO DOWN TIME SYSTEM
Rail-to-Rail Switching
SOME APPLICATIONS .OR HOTSWITCH PRODUCTS
Fast Ethernet Data Switching (LAN Switch)
Hot Swapping
7
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
Open
V
LO AD
GN D
V
CC
Pulse
Generator
D .U.T.
500
500
C
L
R
T
V
IN
V
O UT
(1, 2)
SAME PHASE
IN PU T TRANSITION
OPPOSITE PH ASE
IN PU T TRANSITION
0V
0V
V
O H
V
O L
t
PLH
t
PHL
t
PHL
t
PLH
OU TPU T
V
IH
V
T
V
T
V
IH
V
T
C ONTR OL
IN PU T
t
PLZ
0V
OU TPU T
N ORM ALLY
LO W
t
PZ H
0V
SW IT C H
C LO SE D
OU TPU T
N ORM ALLY
H IGH
ENABLE
D ISABLE
SW IT C H
O P E N
t
PHZ
0V
V
O L +
V
LZ
V
O H
V
T
V
T
t
PZ L
V
LO AD/2
V
L O A D /2
V
IH
V
T
V
O L
V
O H -
V
H Z
TEST CIRCUITS AND WAVE.ORMS
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Propagation Delay
Test Circuits for All Outputs
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate
1.0MHz; t
F
2.5ns; t
R
2.5ns.
2. Pulse Generator for All Pulses: Rate
1.0MHz; t
F
2ns; t
R
2ns.
SWITCH POSITION
Test
Switch
t
PLZ
/
t
PZL
V
LOAD
t
PHZ/
t
PZH
GND
t
PD
Open
TEST CONDITIONS
Symbol
V
CC
(1)
= 3.3V 0.3V
V
CC
(2)
= 2.5V 0.2V
Unit
V
LOAD
6
2 x Vcc
V
V
IH
3
Vcc
V
V
T
1.5
V
CC
/2
V
V
LZ
300
150
mV
V
HZ
300
150
mV
C
L
50
30
pF
8
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH16212
2.5V / 3.3V 24-BIT BUS EXCHANGE HIGH BANDWIDTH BUS SWITCH
ORDERING IN.ORMATION
IDTQS
XXXXX
XX
Package
Device Type
3VH16212
2.5V / 3.3V 24-Bit Bus Exchange High Bandwidth Bus Switch
PV
PA
Shrink Small Outline Package
Thin Shrink Small Outline Package
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
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