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IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS 2.5V / 3.3V 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
FEATURES: DESCRIPTION:
IDTQS3VH251
* 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 - 4 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 Demux capacitance, 4pF typical * Available in QSOP and TSSOP packages
The QS3VH251 HotSwitch Quad 2:1 multiplexer/demultiplexer is a high bandwidth bus switch. The QS3VH251 has very low ON resistance, resulting in under 250ps propagation delay through the switch. The Select (Sx) input controls the data flow. The multiplexers/demultiplexers are enabled when the Enable (E) input is low. 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 QS3VH251 ideal for high performance comminucation applications. The QS3VH251 is characterized for operation from -40C to +85C.
APPLICATIONS:
* * * * *
Hot-swapping Multiplexing/demultiplexing Low distortion analog switch Replaces mechanical relay ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
S0 S1 S2 E
I0 I1 I2 Y I3 I4 I5 I6 I7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c 2002 Integrated Device Technology, Inc.
AUGUST 2002
DSC-5944/7
IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) VTERM(3) VAC IOUT TSTG Description Max SupplyVoltage to Ground DC Switch Voltage VS DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current (max. sink current/pin) Storage Temperature -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
I3 I2 I1 I0 Y NC E GND
1 2 3 4 5 6 7 8
QSOP/ TSSOP TOP VIEW
16 15 14 13 12 11 10 9
VCC I4 I5 I6 I7 S0 S1 S2
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 = +25C, F = 1MHz, VIN = 0V, VOUT = 0V)
Symbol CIN CI/O CI/O Parameter(1) Control Inputs Quickswitch Channels (Switch OFF) Quickswitch Channels (Switch ON) Demux Mux Demux Mux Typ. 3 4 19 20 20 Max. 5 6 25 28 28 pF Unit pF pF
NOTE: 1. This parameter is guaranteed but not production tested.
FUNCTION TABLE(1)
Select E H L L L L L L L L S2 X L L L L H H H H S1 X L L H H L L H H S0 X L H L H L H L H Y Z I0 I1 I2 I3 I4 I5 I6 I7 Function Disable S2 - S0 = 0 S2 - S0 = 1 S2 - S0 = 2 S2 - S0 = 3 S2 - S0 = 4 S2 - S0 = 5 S2 - S0 = 6 S2 - S0 = 7
PIN DESCRIPTION
Pin Names I0 - I7 S0 - S2 E Y I/O I I I O Description Data Inputs Select Input Enable Input Data Outputs
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedence
2
IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 3.3V 0.3V
Symbol VIH VIL IIN IOZ IOFF RON 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 for Control Inputs Guaranteed Logic LOW for Control Inputs 0V VIN VCC 0V VOUT 5V, Switches OFF VIN or VOUT 0V to 5V, VCC = 0V VCC = 2.3V Typical at VCC = 2.5V VCC = 3V
NOTE: 1. Typical values are at VCC = 3.3V and TA = 25C.
Test Conditions Guaranteed Logic HIGH VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V
Min. 1.7 2 -- -- -- -- --
Typ.(1) Max. -- -- -- -- -- -- -- 6 7 4 5 -- -- 0.7 0.8 1 1 1 8 9 6 8
Unit V V A A A
VIN = 0V VIN = 1.7V VIN = 0V VIN = 2.4V
ION = 30mA ION = 15mA ION = 30mA ION = 15mA
-- -- -- --
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
16 14
RON
(ohms)
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
VIN
(Volts)
3
IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current (2,3) per Input HIGH Dynamic Power Supply Current
(4)
Test Conditions(1) VCC = Max., VIN = GND or VCC, f = 0 VCC = Max., VIN = 3V, f = 0 per Control Input VCC = 3.3V, A and B Pins Open, Control Inputs Toggling @ 50% Duty Cycle
Min. -- --
Typ. 1 --
Max. 4 30
Unit mA A
See Typical ICCD vs Enable Frequency graph below
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. Mux/demux 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 mux/demux 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
6
4
ICCD (mA)
2 0 0 2 4 6 8 10 12 14 16 18 20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C
VCC = 2.5 0.2V (1) Symbol tPLH tPHL tSEL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ fEorSx Parameter Data Propagation Delay(2,3) Y to Ix or Ix to Y Select Time Sx to Y Enable Time S to Ix Disable Time S to Ix Enable Time E to Y or Ix Disable Time E to Y or Ix Operating Frequency - Enable(2,5) Min. (4) VCC = 3.3 0.3V (1) Min. (4) 1.5 1.5 1.5 1.5 1.5 Max. 0.2 8 9 8 8 8 20 Unit ns ns ns ns ns ns MHz Max. 0.2 9 9 8 9 8 10
1.5 1.5 1.5 1.5 1.5
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 Sx or E control input (pass voltage > VCC, VIN = 5V, RLOAD 1M, no CLOAD).
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IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
Rail-to-Rail Switching
Multiplexing/Demultiplexing
Hot-Swapping 6
IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC = 3.3V 0.3V
(1)
VCC = 2.5V 0.2V
(2)
Unit V V V mV mV pF
SAM E PHASE INPUT TRANSITION tPLH OUTPUT tPLH O PPOSITE PHASE INPUT TRANSITION tPHL tPHL
VIH VT 0V VOH VT VOL VIH VT 0V
6 3 1.5 300 300 50
2 x Vcc Vcc VCC/2 150 150 30
Propagation Delay
VCC 500 Pulse Generator
(1, 2)
VLOAD ENABLE Open G ND CONTRO L INPUT tPZL OUTPUT SW ITCH NORMALLY CLO SED LOW tPZH OUTPUT SW ITCH NORMALLY OPEN HIGH VLOAD/2 VT
DISABLE
VIH VT 0V VLOAD/2 VOL VOL VOH VOH 0V
+
VIN D.U.T.
VOUT
tPLZ
VLZ
RT
500 CL
tPHZ VT 0V
-V H Z
Test Circuits for All Outputs
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 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.
Enable and Disable Times
SWITCH POSITION
Test tPLZ/tPZL tPHZ/tPZH
tPD
Switch VLOAD GND Open
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IDTQS3VH251 2.5V / 3.3V QUAD 8:1 MUX/DEMUX HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package
Q QG PA 3VH251
Quarter Size Outline Package QSOP - Green Thin Shrink Small Outline Package 2.5V / 3.3V 8:1 Mux/Demux High Bandwidth Bus Switch
DATA SHEET DOCUMENT HISTORY
8/6/2002 Updated according to PCN Logic-0206-11
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com 8
for Tech Support: logichelp@idt.com (408) 654-6459

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