1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH245
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
2003 Integrated Device Technology, Inc.
DSC-5775/6
c
IDTQS3VH245
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH
PRODUCTS
2.5V / 3.3V 8-BIT HIGH
BANDWIDTH BUS SWITCH
FUNCTIONAL BLOCK DIAGRAM
DESCRIPTION:
The QS3VH245 HotSwitch 8-bit bus switch is a high bandwidth bus switch.
The QS3VH245 has very low ON resistance, resulting in under 250ps
propagation delay through the switch. The switches can be turned ON under
the control of the LVTTL-compatible Output Enable signal for bidirectional data
flow with no added delay or ground bounce. 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 QS3VH245 ideal forhigh performance
communications applications.
The QS3VH245 is characterized for operation from -40
C to +85C.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
Hot-swapping
10/100 Base-T, Ethernet LAN switch
Low distortion analog switch
Replaces mechanical relay
ATM 25/155 switching
Bus switching and isolation
FEATURES:
N channel FET switches with no parasitic diode to V
CC
Isolation under power-off conditions
No DC path to V
CC
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
V
CC
operation: 2.3V to 3.6V
High bandwidth - up to 500MHz
LVTTL-compatible control Inputs
Undershoot Clamp Diodes on all switch and control Inputs
Low I/O capacitance, 4pF typical
Available in QSOP, SOIC, and TSSOP packages
B
0
O E
A
0
B
1
A
1
B
2
A
2
B
3
A
3
B
4
A
4
B
5
A
5
B
6
A
6
B
7
A
7
MARCH 2003
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH245
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
PIN CONFIGURATION
Symbol
Description
Max
Unit
V
TERM
(2)
SupplyVoltage 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. sink current/pin)
120
mA
T
STG
Storage Temperature
65 to +150
C
ABSOLUTE MAXIMUM RATINGS
(1)
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
.
Symbol
Parameter
(1)
Typ.
Max.
Unit
C
IN
Control Inputs
3
5
pF
C
I/O
Quickswitch Channels (Switch OFF)
4
6
pF
C
I/O
Quickswitch Channels (Switch ON)
8
12
pF
CAPACITANCE
(T
A
= +25C, F = 1MHz, V
IN
= 0V, V
OUT
= 0V)
NOTE:
1. This parameter is guaranteed but not production tested.
Pin Names
Description
OE
Output Enable
A x
Data I/Os
B x
Data I/Os
PIN DESCRIPTION
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
OE
Outputs
H
Disconnected
L
Ax = Bx
FUNCTION TABLE
(1)
QSOP/ SOIC/ TSSOP
TOP VIEW
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
V
CC
OE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
3
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH245
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
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
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 LOW
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
Typical 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
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= 40C to +85C, V
CC
= 3.3V 0.3V
NOTE:
1. Typical values are at V
CC
= 3.3V and T
A
= 25C.
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH245
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
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.
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
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
TYPICAL I
CCD
vs ENABLE FREQUENCY CURVE AT V
CC
= 3.3V
0
2
4
6
8
10
12
0
2
4
6
8
10
12
14
16
18
20
I
CCD
(mA)
ENABLE FREQUENCY (MHZ)
5
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH245
2.5V / 3.3V 8-BIT 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
Ax to/from Bx
t
PZL
Switch Turn-On Delay
1.5
8
1.5
7
ns
t
PZH
OE to Ax/Bx
t
PLZ
Switch Turn-Off Delay
1.5
7
1.5
6.5
ns
t
PHZ
OE to Ax/Bx
f
OE
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 OE control input (pass voltage > V
CC
, V
IN
= 5V, R
LOAD
1M, no C
LOAD
).
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