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IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS 2.5V/ IDTQS3VH16861 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
FEATURES: 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 * 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 500 MHz * 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
The QS3VH16861 HotSwitch with 20-bit flow-though pin out is a high bandwidth bus switch. The QS3VH16861 has very low ON resistance, resulting in under 250ps propagation delay through the switch. The switches are controlled by active low enable (BEx) controls. 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 QS3VH16861 ideal for high performance communications applications. The QS3VH16861 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
A0
B0
A10
B10
A9
B9
A19
B19
BE 1
BE2
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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c 2001 Integrated Device Technology, Inc.
NOVEMBER 2001
DSC-5875/3
IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND NC A10 A11 A12 A13 A14 A15 A16 A17 A18 A19 GND 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 VCC BE1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 VCC BE2 B10 B11 B12 B13 B14 B15 B16 B17 B18 B19
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) VTERM(3) VAC IOUT TSTG Description Supply Voltage to Ground DC Switch Voltage VS DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current (max. current/pin) Storage Temperature Max. - 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
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
Symbol CIN CI/O CI/O Parameter(1) Control Inputs
(TA = +25 C, f = 1MHz, VIN = 0V, VOUT = 0V) Typ. 3 4 8 Max. 5 6 12 Unit pF pF pF
o
Quickswitch Channels (Switch OFF) Quickswitch Channels (Switch ON)
NOTE: 1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names BEx A0 - A19 B 0 - B19 Bus A Bus B Description Active LOW Bus Enable
FUNCTION TABLE(1)
BE1 L L BE2 L H L H A0 - A9 B0 - B9 B0 - B9 Z Z A10 - A19 B10 - B19 Z B10 - B19 Z Function Connect Connect B0 - B9, Disconnect B10 - B19 Disconnect B0 - B9, Connect B10 - B19 H Disconnect
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedence
SSOP/ TSSOP TOP VIEW
H
2
IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE(1)
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 Test Conditions Guaranteed Logic HIGH for Control Inputs Guaranteed Logic HIGH for Control Inputs 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 -- -- -- -- -- ION = 30mA ION = 15mA ION = 30mA ION = 15mA -- -- -- -- Typ.(1) -- -- -- -- -- -- -- 6 7 4 5 Max. -- -- 0.7 0.8 1 1 1 8 9 6 8 A A A V Unit V
VCC 0V VOUT 5V, Switches OFF
VIN or VOUT 0V to 5V, VCC = 0V VCC = 2.3V VCC = 3V VIN = 0V VIN = 0V VIN = 2.4V (Typ. at VCC = 2.5V) VIN = 1.7V
0V VIN
NOTE: 1. Typical values are at VCC = 3.3V and TA = 25C, unless otherwise noted.
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
16
RON
(ohms)
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 4.5 5.0
VIN
(Volts)
3
IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
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
14
12
10
ICCD (mA)
8
6
4
2
0 0 2 4 6 8 10 12 14 16 18 20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, 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 tPZH tPZL tPHZ tPLZ fBEx Parameter Data Propagation Delay(2,3) A to B or B to A Switch Turn-On Delay BEx to xA or xB Switch Turn-Off Delay BEx to xA or xB Operating Frequency - Enable (2,5) Min. (4)
Max.
VCC = 3.3 0.3V (1) Min. (4)
Max.
1.5 1.5
0.2 8.5 7.5 10
1.5 1.5
Unit ns ns ns MHz
0.2 8 7.5 20
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 BEx control input (pass voltage > VCC, VIN = 5V, RLOAD > 1M, no CLOAD).
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IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
NFET
0 to +5V
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
10M bps to 100Mbps >100m TWISTED PAIR
Z = 100
LOGIC SID E 2VPP
Fast Ethernet Data Switching (LAN Switch)
PLUGGABLE CARD/ LIVE SYSTEM CONN ECTOR
ZERO DOWN TIME SYSTEM QS3VH XXX
CARD I/O
ON CARD LOGIC
CPU
C ON NEC TOR
QS3VH XX X
CARD I/O
ON CARD LOGIC
RAM
Hot Swapping 6
BUS
IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC(1)= 3.3V 0.3V 6 3 1.5 300 300 50 VCC(2)= 2.5V 0.2V 2 x Vcc Vcc VCC/2 150 150 30 Unit V V V mV mV pF
tPLH OPPOSITE PHASE INPUT TRANSITIO N tPHL SAM E PHAS E INPUT TRANSITION tPLH OUTPUT tPHL VIH VT 0V VOH VT VOL VIH VT 0V
Propagation Delay
VLOAD ENABLE Open 500 Pulse G enerator
(1, 2)
VCC
DISABLE
GND
CONTROL INPUT tPZL OUTPUT SW ITCH NORMALLY CLOSED LOW tPZH OUTPUT SW ITCH NO RM ALLY OPEN HIGH VLOAD/2 VT tPHZ VT 0V tPLZ
VIH VT 0V VLOAD/2 V OL V OL VOH V OH 0V
+
VIN D.U.T.
VOUT
V LZ
RT
500 CL
-V H Z
Test Circuits for All Outputs
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 1.0MHz; tF 2.5ns; tR 2.5ns. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2ns; tR 2ns.
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
Enable and Disable Times
SWITCH POSITION
Test tPLZ/tPZL tPHZ/tPZH
tPD
Switch VLOAD GND Open
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IDTQS3VH16861 2.5V / 3.3V 20-BIT FLOW-THROUGH PIN OUT, HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package
PV PA PAG 3VH16861
Shrink Small Outline Package Thin Shrink Small Outline Package TSSOP - Green 2.5V / 3.3V 20-Bit Flow Though Pin Out, High Bandwidth Bus Switch
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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