IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS
2.5V / 3.3V 8-BIT HIGH
BANDWIDTH BUS SWITCH
FEATURES:
IDTQS3VH244
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
Ω typical
• Low RON - 4Ω
• Flat RON characteristics over operating range
• Rail-to-rail switching 0 - 5V
• Bidirectional dataflow with near-zero delay: no added ground
bounce
• Excellent RON matching between channels
• VCC 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 and TSSOP packages
The QS3VH244 HotSwitch is a high bandwidth, 8-bit bus switch. The
QS3VH244 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 xG 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 impedence, and
over-voltage tolerance makes the QS3VH244 ideal for high performance
communications applications.
The QS3VH244 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
Bus switching and isolation
FUNCTIONAL BLOCK DIAGRAM
1G
2G
1A1
1Y1
2A1
2Y1
1A2
1Y2
2A2
2Y2
1A3
1Y3
2A3
2Y3
1A4
1Y4
2A4
2Y4
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
MAY 2013
1
c 2013 Integrated Device Technology, Inc.
DSC-5894/14
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ABSOLUTE MAXIMUM RATINGS(1)
PIN CONFIGURATION
Symbol
20
1G
1A1
1
2
19
2G
2Y4
3
18
1Y1
VCC
1A2
4
17
2A4
2Y3
5
16
1Y2
1A3
6
15
2A3
2Y2
7
14
1Y3
1A4
8
13
2A2
2Y1
9
12
1Y4
GND
10
11
2A1
Max
Unit
SupplyVoltage to Ground
–0.5 to +4.6
V
DC Switch Voltage VS
–0.5 to +5.5
V
VTERM(3)
DC Input Voltage VIN
–0.5 to +5.5
V
VAC
AC Input Voltage (pulse width ≤20ns)
–3
V
IOUT
DC Output Current (max. sink current/pin)
120
mA
TSTG
Storage Temperature
–65 to +150
°C
VTERM(2)
VTERM(3)
Description
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. VCC terminals.
3. All terminals except VCC .
CAPACITANCE (TA = +25°C, F = 1MHz, VIN = 0V, VOUT = 0V)
Parameter(1)
Symbol
QSOP/ TSSOP
TOP VIEW
Typ.
Max.
Unit
CIN
Control Inputs
3
5
pF
CI/O
Quickswitch Channels (Switch OFF)
4
6
pF
CI/O
Quickswitch Channels (Switch ON)
8
12
pF
NOTE:
1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names
Description
xG
Output Enable
xAx
Data I/Os
xYx
Data I/Os
FUNCTION TABLE(1)
xG
Outputs
H
Disconnected
L
xAx = xYx
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
2
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 3.3V ±0.3V
Symbol
VIH
VIL
Parameter
Test Conditions
Input HIGH Voltage
Input LOW Voltage
Min.
Typ.(1) Max.
Guaranteed Logic HIGH
VCC = 2.3V to 2.7V
1.7
—
—
for Control Inputs
VCC = 2.7V to 3.6V
2
—
—
Guaranteed Logic LOW
VCC = 2.3V to 2.7V
—
—
0.7
for Control Inputs
VCC = 2.7V to 3.6V
—
—
0.8
Unit
V
V
IIN
Input Leakage Current (Control Inputs)
0V ≤ VIN ≤ VCC
—
—
±1
μA
IOZ
Off-State Current (Hi-Z)
0V ≤ VOUT ≤ 5V, Switches OFF
—
—
±1
μA
IOFF
Data Input/Output Power Off Leakage
VIN or VOUT 0V to 5V, VCC = 0V
—
—
±1
μA
VCC = 2.3V
VIN = 0V
ION = 30mA
—
6
8
RON
Switch ON Resistance
Typical at VCC = 2.5V
VIN = 1.7V
ION = 15mA
—
7
9
VCC = 3V
VIN = 0V
ION = 30mA
—
4
6
VIN = 2.4V
ION = 15mA
—
5
8
NOTE:
1. Typical values are at VCC = 3.3V and TA = 25°C.
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
16
R ON
14
(ohms)
12
10
8
6
4
2
0
0.0
0.5
1.0
1.5
2.0
2.5
V IN
(Volts)
3
3.0
3.5
4.0
4.5
5.0
Ω
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol
Test Conditions(1)
Parameter
Min.
Typ.
Max.
Unit
ICCQ
Quiescent Power Supply Current
VCC = Max., VIN = GND or VCC, f = 0
—
2
4
mA
ΔICC
Power Supply Current (2,3) per Input HIGH
VCC = Max., VIN = 3V, f = 0 per Control Input
—
—
30
μA
ICCD
Dynamic Power Supply Current
VCC = 3.3V, A and Y Pins Open, Control Inputs
(4)
See Typical ICCD 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 Y pins do not contribute to ΔIcc.
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 Y inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
TYPICAL ICCD vs ENABLE FREQUENCY CURVE AT VCC = 3.3V
12
10
ICCD (mA)
8
6
4
2
0
0
2
4
6
8
10
12
ENABLE FREQUENCY (MHz)
4
14
16
18
20
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C
VCC = 2.5 ± 0.2V (1)
Symbol
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
fxG
Parameter
Data Propagation Delay(2,3)
xAx to/from xYx
Switch Turn-On Delay
xG to xAx/xYx
Switch Turn-Off Delay
xG to xAx/xYx
Operating Frequency - xG (2,5)
Min. (4)
VCC = 3.3 ± 0.3V (1)
⎯
Max.
0.2
Min. (4)
⎯
Max.
0.2
Unit
ns
1.5
8
1.5
7.5
ns
1.5
7
1.5
7
ns
⎯
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 CL = 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 xG control input (pass voltage > VCC, VIN = 5V, RLOAD ≥ 1MΩ, no CLOAD).
5
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
NFET
0 to +5V
Vcc = 3.3V
+6.5V
CHARGE PUMP
OE
0 to +5V
DRIVER
SINGLE HOT
SWITCH
Rail-to-Rail Switching
PHY
3VH
SWITCH
4.5VPP
10Mbps to 100Mbps
Z = 100 Ω
LOGIC
SIDE
Z = 100 Ω
>100m
4.5VPP
TWISTED PAIR
LOGIC
SIDE
2VPP
Fast Ethernet Data Switching (LAN Switch)
ZERO DOWN TIME SYSTEM
PLUGGABLE CARD/ LIVE SYSTEM
CARD I/O
ON CARD
LOGIC
CONNECTOR
QS3VHXXX
CPU
CARD I/O
ON CARD
LOGIC
CONNECTOR
QS3VHXXX
RAM
BUS
Hot-Swapping
6
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
VCC = 3.3V ± 0.3V
VCC = 2.5V ± 0.2V
Unit
VLOAD
6
2 x Vcc
V
VIH
3
Vcc
V
(1)
(2)
VT
1.5
VCC/2
V
VLZ
300
150
mV
VHZ
300
150
mV
CL
50
30
pF
SAME PHASE
INPUT TRANSITION
tPLH
tPHL
t PLH
t PHL
OUTPUT
V IH
VT
0V
V OH
VT
V OL
V IH
VT
0V
OPPOSITE PHASE
INPUT TRANSITION
Propagation Delay
V LOAD
V CC
500 Ω
(1, 2)
Pulse
Generator
V IN
CONTROL
INPUT
GND
t PZL
V OUT
D.U.T.
RT
DISABLE
ENABLE
Open
OUTPUT
SW ITCH
NORMALLY
CLO SED
LOW
t PZH
OUTPUT SW ITCH
NORMALLY
OPEN
HIGH
500 Ω
CL
t PLZ
V IH
VT
0V
V LOAD/2
V LO A D /2
VT
VOL
VOL
tPHZ
+
V LZ
VT
VOH
V O H -V H Z
0V
0V
Test Circuits for All Outputs
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2ns.
SWITCH POSITION
Test
Switch
tPLZ/tPZL
VLOAD
tPHZ/tPZH
GND
tPD
Open
7
IDTQS3VH244
2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
QS
XXXXX
XX
Package
Device Type
X
Blank
8
Tube or Tray
Tape and Reel
QG
PAG
QSOP - Green
TSSOP - Green
3VH244
2.5V/3.3V 8-Bit High
Bandwidth Bus Switch
Datasheet Document History
09/01/2008
Pg. 4, 8
05/22/2013
Pg. 8
Revise ICCQ Typ. and Max. Remove non green package version and updated the Ordering
Information by removing the “IDT” notation.
Updated the Ordering Information by Adding Tape and Reel information.
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fax: 408-284-2775
www.idt.com
8
for Tech Support:
logichelp@idt.com
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