1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
MARCH 2003
2003 Integrated Device Technology, Inc. DSC-5597/7c
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
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
FEATURES:
• 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 RON - 4ΩΩ
ΩΩ
Ω typical
• 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, TSSOP, and SOIC packages
IDTQS3VH125
QUICKSWITCH® PRODUCTS
2.5V / 3.3V QUAD ACTIVE LOW,
HIGH BANDWIDTH BUS SWITCH
DESCRIPTION:
The QS3VH125 is a high bandwidth, Quad bus switch. The QS3VH125
has very low ON resistance, resulting in under 250ps propagation delay
through the switch. The switches can be turned ON under the control of
individual LVTTL-compatible active low Output Enable signals for bidirec-
tional 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 QS3VH125 ideal for high perfor-
mance communications applications.
The QS3VH125 is characterized for operation from -40°C to +85°C.
4OE
1A
1Y2Y3Y4Y
2A3A4A
3OE
2OE
1OE
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
PIN CONFIGURATION Symbol Description Max Unit
VTERM(2) SupplyVoltage to Ground –0.5 to +4.6 V
VTERM(3) 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
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. VCC terminals.
3. All terminals except VCC .
Symbol Parameter(1) 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
CAPACITANCE (TA = +25°C, F = 1MHz, VIN = 0V, VOUT = 0V)
NOTE:
1. This parameter is guaranteed but not production tested.
Pin Names I/ O Description
1A - 4AI/ O Bus A
1Y - 4YI/ O Bus Y
1OE - 4OE I Output Enable
PIN DESCRIPTION
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
OE A Y Function
L H H Connect
L L L Connect
H X X Disconnect
FUNCTION TABLE(1)
QSOP
TOP VIEW
SOIC/ TSSOP
TOP VIEW
NC VCC
1OE 4OE
1A4A
1Y4Y
2OE 3OE
2A3A
2Y3Y
GND NC
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
VCC
1OE
4OE
1A
4A
1Y
4Y
2OE
3OE
2A
3A
2Y
3Y
1
2
3
4
5
6
78
9
10
11
12
13
14
GND
3
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
TYPICAL ON RESIST ANCE vs VIN AT VCC = 3.3V
RON
(ohms)
VIN
(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 5.04.5
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH VCC = 2.3V to 2.7V 1 . 7 — — V
for Control Inputs VCC = 2.7V to 3.6V 2 — —
VIL Input LOW Voltage Guaranteed Logic LOW VCC = 2.3V to 2.7V — — 0 . 7 V
for Control Inputs VCC = 2.7V to 3.6V — — 0.8
IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC ——±1µA
IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ 5V, Switches OFF — — ±1 µ A
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 Ω
VCC = 3V VIN = 0V ION = 30mA — 4 6
VIN = 2.4V ION = 15mA — 5 8
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 3.3V ±0.3V
NOTE:
1. Typical values are at VCC = 3.3V and TA = 25°C.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
TYPICAL ICCD vs ENABLE FREQUENCY CURVE A T VCC = 3.3V
ICCD (mA)
ENABLE FREQUENCY (MHz)
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 ∆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 Y 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
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 — 1 3 mA
∆ICC Power Supply Current (2,3) per Input HIGH VCC = Max., VIN = 3V, f = 0 per Control Input — — 30 µA
ICCD Dynamic Power Supply Current (4) VCC = 3.3V, A and Y Pins Open, Control Inputs See Typical ICCD vs Enable Frequency graph below
Toggling @ 50% Duty Cycle
0
2
4
6
0 2 4 6 8101214161820
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C VCC = 2.5 ± 0.2V (1) VCC = 3.3 ± 0.3V (1)
Symbol Parameter Min. (4) Max. Min. (4) Max. Unit
tPLH Data Propagation Delay(2,3) 0.2 0.2 ns
tPHL A to Y
tPZL Switch Turn-On Delay 1.5 8 1.5 6.5 ns
tPZH xOE to xA/xY
tPLZ Switch Turn-Off Delay 1.5 7 1.5 7 ns
tPHZ xOE to xA/xY
fxOE 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 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 xOE control input (pass voltage > VCC, VIN = 5V, RLOAD ≥ 1MΩ, no CLOAD).
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
PHY
3VH
SWITCH
4.5VPP
LOGIC
SIDE Z = 100 Ω10Mbps to 100Mbps
2VPP
4.5VPP
LOGIC
SIDE
Z = 100 Ω
TWISTED PAIR
>100m
CHARGE PUMP
OE
Vcc = 3. 3V
0 to +5V NFET
+6.5V
DRIVER
0 to +5 V
SINGLE HOT
SWITCH
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
CPU
RAM
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLUGGABLE CAR D/ LIVE SYSTEM ZERO DOWN TIME SYSTEM
Rail-to-Rail Switching
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
Fast Ethernet Data Switching (LAN Switch)
Hot-Swapping
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
Open
VLOAD
GND
VCC
Pulse
Generator D.U.T.
500Ω
500Ω
CL
RT
VIN VOUT
(1, 2 )
SAME PHASE
INPUT TRANSITION
OPP OSITE PH ASE
INP U T TR AN SITION
0V
0V
VOH
VOL
tPLH tPHL
tPHL
tPLH
OUTPUT
VIH
VT
VT
VIH
VT
CONTROL
INPUT tPLZ 0V
OUTPUT
NORMALLY
LOW tPZH
0V
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE DISABLE
SWITCH
OPEN
tPHZ
0V
VOL + VLZ
VOH
VT
VT
tPZL
VLOAD/2 VLOAD/2
VIH
VT
VOL
VOH -VHZ
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol VCC(1)= 3.3V ± 0.3V VCC(2)= 2.5V ± 0.2V Unit
VLOAD 6 2 x Vcc V
VIH 3 Vcc V
VT1.5 VCC/2 V
VLZ 300 150 mV
VHZ 300 150 mV
CL50 30 pF
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
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.
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
SWITCH POSITION
Test Switch
tPLZ/tPZL VLOAD
tPHZ/tPZH GND
tPD Open
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
2.5V / 3.3V QUAD ACTIVE LOW, HIGH BANDWIDTH SWITCH
ORDERING INFORMATION
IDTQS XXXXX XX
Package
Device Type
3VH125 2.5V / 3.3V Quad Active Low, High Bandwidth Switch
S1
S1G
Q
QG
PA
Small Outline IC
SOIC - Green
Quarter Size Outline Package
QSOP - Green
Thin Sh r ink Small Out line 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
8/6/2002 Updated according to PCN Logic-0206-11
3/3/2003 Changed Icc limits
DATA SHEET DOCUMENT HISTORY
