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IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
* 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 * B port precharged to user-selectable VBIAS * 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 I/O capacitance, 4pF typical * Available in SSOP and TSSOP packages
IDTQS3VH16800 PRELIMINARY
FEATURES:
DESCRIPTION:
The QS3VH16800 HotSwitch is a 20-bit high bandwidth bus switch. The QS3VH16800 has very low ON resistance, resulting in under 250ps propagation delay through the switch. The QS3VH16800 precharges the B port to a user selectable bias voltage (VBIAS) to minimize live insertion noise. 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. It can be used as two 10-bit bus switches or one 20-bit bus switch. 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 QS3VH16800 ideal for high performance communications applications. The QS3VH16800 is characterized for operation from -40C to +85C.
APPLICATIONS:
* * * * *
Hot-swapping 10/100 Base-T, Ethernet LAN switch Low distortion analog switch Replaces mechanical relay ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
VBIAS VBIAS
A0
B0
A10
B10
A9
B9
A19
B19
OE1
OE2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c 2002 Integrated Device Technology, Inc.
MARCH 2002
DSC-5961/5
IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Description Max VTERM(2) VTERM(3) VTERM(3) 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
VBIAS A0 A1 A2 A3 A4 A5 GND A6 A7 A8 A9 A10 A11 VCC A12 GND A13 A14 A15 A16 A17 A18 A19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
OE1 OE2 B0 B1 B2 B3 B4 GND B5 B6 B7 B8 B9 B10 B11 B12 GND B13 B14 B15 B16 B17 B18 B19
VAC IOUT TSTG
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) VBIAS = OPEN Quickswitch Channels (Switch ON) 8 12 pF
NOTE: 1. This parameter is guaranteed but not production tested.
Typ. 3 4
Max. 5 6
Unit pF pF
PIN DESCRIPTION
Pin Names OEx VBIAS Ax Bx I/O I I I/O I/O Description Bus Switch Enable Bias Voltage Bus A Bus B
FUNCTION TABLE (EACH 10-BIT BUS SWITCH)(1)
OEx L H
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedence
Bx Ax VBIAS
Function Connect Disconnect Ax = Z
SSOP/ TSSOP TOP VIEW
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IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
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 VBIAS | IO | IIN IOZ IOFF RON Parameter Input HIGH Voltage Input LOW Voltage Bias Voltage Bias Current(2) 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 VCC = 3.3V to 3.6V, IO = 0 VCC = 2.3V to 2.7V, IO = 0 VCC = 3.3V, VBIAS = 2.4V, VO = 0, OEx = HIGH 0V VIN VCC 0V VOUT 5V, Switches OFF VIN or VOUT 0V to 5V, VCC = 0V VCC = 2.3V Typ. at VCC = 2.5V VCC = 3V
NOTES: 1. Typical values are at VCC = 3.3V and TA = 25C. 2. Bias resistance is 5K typical at VCC = 3.3V; VBIAS = 2.4V at 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 -- -- 0 0 0.25 -- -- -- ION = 30mA ION = 15mA ION = 30mA ION = 15mA -- -- -- --
Typ.(1) -- -- -- -- -- -- -- -- -- -- 6 7 4 5
Max. -- -- 0.7 0.8 5 3.3 -- 1 1 1 8 9 6 8
Unit V V V mA A A A
VIN = 0V VIN = 1.7V VIN = 0V VIN = 2.4V
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
IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current
(2,3)
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 per Input HIGH
Min. -- --
Typ. 1.5 --
Max. 3 30
Unit mA A
Dynamic Power Supply Current(4)
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. 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 ICCD vs ENABLE FREQUENCY CURVE AT VCC = 3.3V
20 18 16 14 12
ICCD (mA)
10 8 6
4 2 0 0 2 4 6 8 10 12 14 16 18 20
ENABLE FREQUENCY (MHz)
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IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C
VCC = 2.5 0.2V (1) Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ fOEx Parameter Data Propagation Delay(2,3) Ax to Bx or Bx to Ax Switch Turn-On Delay OEx to Ax/Bx Switch Turn-Off Delay OEx to Ax/Bx Operating Frequency - Enable(2,5) (OEx)
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 OEx control input (pass voltage > VCC, VIN = 5V, RLOAD > 1M, no CLOAD).
VCC = 3.3 0.3V (1) Min. (4) 1.5 1.5 Max. 0.2 8 7.5 20 Unit ns ns ns MHz
Test Conditions
Min. (4)
1.5 1.5
Max. 0.2 8.5 7.5 10
VBIAS = 3V VBIAS = GND VBIAS = 3V VBIAS = GND VBIAS = OPEN
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IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
0 to +5V NFET 0 to +5V
Vcc = 3.3V
CHARGE PUMP
+6.5V
OE
DRIVER SINGLE HOT SWITCH
Rail-to-Rail Switching
PHY 4.5VPP 3VH SWITCH
LOGIC SIDE 4.5VPP
Z = 100
10Mbps to 100Mbps >100m TWISTED PAIR
Z = 100
LOGIC SIDE 2VPP
Fast Ethernet Data Switching (LAN Switch)
PLUGGABLE CARD/ LIVE SYSTEM CONNECTOR
ZERO DOWN TIME SYSTEM QS3VHXXX
CARD I/O
ON CARD LOGIC
CPU
CONNECTOR
QS3VHXXX
CARD I/O
ON CARD LOGIC
RAM
BUS
Hot Swapping 6
IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
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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IDTQS3VH16800 2.5V / 3.3V 20-BIT HIGH BANDWIDTH BUS SWITCH WITH PRECHARGED OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package
PV PA
Shrink Small Outline Package Thin Shrink Small Outline Package
3VH16800
2.5V/3.3V 20-Bit High Bandwidth Bus Switch with Precharged Outputs
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
for Tech Support: logichelp@idt.com (408) 654-6459
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