1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
DECEMBER 1999
1999 Integrated Device Technology, Inc. DSC-5597/-c
IDTQS3VH125
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS
3.3V QUAD ACTIVE LOW SWITCH
FOR HOT SWAP APPLICATIONS
(HOTSWITCH™)
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
The QS3VH125 HotSwitch Quad bus switch is specially designed for a hot-
swapping environment. 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 bidirectional data flow with no added delay or ground
bounce. 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 QS3VH125 ideal for hot-swapping
applications.
The QS3VH125 is characterized for operation from -40°C to +85°C.
4OE
1A
1Y2Y3Y4Y
2A3A4A
3OE
2OE
1OE
FEATURES:
− N channel FET switches with no parasitic diode to Vcc
• No DC path to Vcc or GND
• 5V tolerant in OFF and ON state
− 5V tolerant I/Os
− Low RON - 4Ω typical
− Flat RON characteristics from 0 - 5V
− 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
− Maximum operating frequency for data - 150MHz
− LVTTL-compatible control Inputs
− Undershoot Clamp Diodes on all switch and control Inputs
− Low I/O capacitance, 4pF typical
− Available in QSOP and SOIC packages
APPLICATIONS:
− PCI/Compact PCI hot-swapping
− 10/100 Base-T, Ethernet LAN switch
− Low distortion analog switch
− Replaces mechanical relay
− ATM 25/155 switching
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
PIN CONFIGURATION
QSOP
TOP VIEW
SOIC
TOP VIEW
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
1OE
1A
1Y
2OE
2A
2Y
GND
VCC
4OE
4A
4Y
3OE
3A
3Y
NC
SO16-7
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1OE
1A
1Y
2OE
2A
2Y
GND
VCC
4OE
4A
4Y
3OE
3A
3Y
SO14-1
ABSOLUTE MAXIMUM RATING(1)
Symbol Description Max. Unit
V
TERM(2) Supply Voltage to Ground – 0.5 to 4.6 V
V
TERM(3) DC Switch Voltage VS– 0.5 to 5.5 V
V
TERM(3) DC Input Voltage VIN – 0.5 to 5.5 V
VAC AC Input Voltage (pulse width ≤20ns) – 3 V
VOUT DC Output Current 120 mA
PMAX Maximum Power Dissipation 0.5 W
TSTG Storage Temperature -65 to 150 °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 (TA = +25oC, f = 1MHz, VIN = 0V, VOUT = 0V)
Symbol Parameter(1) Typ. Max. Unit
CIN Control Inputs 3 5 pF
CI/O Quickswitch Channels (Switch OFF) 4 6 pF
NOTE:
1. This pa ram eter is guaranteed but not producti on tested.
PIN DESCRIPTION
Pin Names I/O Description
1A - 4AI/O Bus A
1Y - 4YI/O Bus B
1OE - 4OE I Output Enable
FUNCTION TABLE (1)
OE A Y Function
L H H Connect
L L L Connect
H X X Disconnect
NOTE:
1. H = HIGH V ol tage Level
L = LOW Volt age Level
X = Don’t Care
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
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 Parameter Test Conditions Min. Typ.(1) Max. Unit
VIH Input HIGH Voltage Guaranteed Logic HIGH for Control Inputs 2 — — V
VIL Input LOW Voltage Guaranteed Logic LOW for Control Inputs — — 0.8 V
IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC ——±1µA
IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF ——±1µA
RON Switch ON Resistance(2) VCC = Min., VIN = 0V, ION = 30mA — 4 6 Ω
VCC = Min., VIN = 2.4V, ION = 15mA — 5 8
NOTES:
1. Typical values are at VCC = 3.3V and TA = 25°C.
2. RON guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
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
RON
(ohms)
VIN
(Volts)
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Max. Unit
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 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 per MHz (4) VCC = Max., A and Y Pins Open, Control Inputs Toggling @ 50% Duty
Cycle 0.25 mA/MHz
NOTES:
1. For conditi ons shown as Mi n. or Max., use the appropriat e values s pec i fied under DC Elec trical Charac t eri stics.
2. Per LVTLL driv en i nput. A and Y pi ns do not cont ri but e to ∆Icc.
3. This paramet er i s guaranteed but not tested.
4. This paramet er represents t he c urrent required to swi tch internal c apacitance at the spec i fied frequency . The A and Y inputs do not contribute t o the
Dynamic Power Supply Current . This paramet er i s guaranteed but not produc tion tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C, VCC = 3.3V ± 0.3V
CLOAD = 50pF, RLOAD = 500Ω unless otherwise noted
Symbol Parameter Min. (3) Typ. Max. Unit
tPLH
tPHL Data Propagation Delay(1,2)
A to Y
0.25 ns
tPZH
tPZL Switch Turn-On Delay
OE to nA/nY 1.5 9ns
tPHZ
tPLZ Switch Turn-Off Delay(1)
OE to nA/nY 1.5 8ns
fSOperating Frequency - Data(1,4)
OE = LOW
150(6) MHz
fOE Operating Frequency - Enable (1,5) 1MHz
NOTES:
1. This param et er i s guaranteed but not production tes ted.
2. The bus s wi tch cont ri but es no propagation delay other than the RC delay of the ON res i s tance of t he switch and t he l oad capacit ance. The tim e
const ant for the swit ch alone is of the order of 0.25ns at CL = 50pF. S i nce this time constant is m uch small er than the rise and f al l times of typical
driving s i gnal s, it adds very li ttle propagation del ay to the system. Propagation delay of the bus s witch, when us ed i n a system, is determined by the
driving c i rcuit on the dri ving side of t he switch and i ts interaction with the load on the driv en side.
3. Mini m um s are guaranteed but not production tes ted.
4. Max i m um frequency f or bi di rec tional data f l ow.
5. Max i m um toggle frequency for OE cont rol i nput.
6. Meas ured at CLOAD = 30pF.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
PHY
3VH
SWITCH
4.5VPP
LOGIC
SIDE Z = 100 Ω10M bps to 100M b ps
2VPP
4.5VPP
LOGIC
SIDE
Z = 100 Ω
TW ISTED PAIR
>100m
CH AR GE PUM P
OE
Vcc = 3.3V
0 to +5V NFET
+6.5V
DRIVER
0 to +5V
SINGLE HO T
SWITCH
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
CPU
RAM
PCI/CO M PA C T P CI
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLUGG ABLE CARD/ LIVE SYSTEM ZERO DOWN TIME SYSTEM
RAIL-TO-RAIL SWITCHING
HOT SWAPPING: PCI/COMPACT PCI
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
FAST ETHERNET DATA SWITCHING (LAN SWITCH)
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
ORDERING INFORMATION
CORPORATE HEADQUARTERS for SALES:
2975 Stender Way 800-345-7015 or 408-727-6116
Santa Clara, CA 95054 fax: 408-492-8674
www.idt.com*
*To search for sales office near you, please click the sales button found on our home page or dial the 800# above and press 2.
The IDT logo, QuickSwitch, and SynchroSwitch are registered trademarks of Integrated Device Technology, Inc.
IDTQS XXXXX XX X
Package Process
Device Type
Blank
3VH125
Ind u s tria l (-40 ° C to + 8 5° C )
3.3V Quad Active Low Sw itch for Hot Swap
Applications
Q
DC Quarter Size Outline Package (SO16-7)
Small Outline IC (SO 14-1)
