1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
FEBRUARY 2000
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, TSSOP, 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/ TSSOP
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
SO16-10
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
VTERM(2) Supply Voltage 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
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 param eter is guaranteed but not production 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 oltage 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
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)
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 VCC = Min., VIN = 0V, ION = 30mA — 4 6 Ω
VCC = Min., VIN = 2.4V, ION = 15mA — 5 8
NOTE:
1. Typical values are at VCC = 3.3V and T A = 25°C.
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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 M i n. or Max., use the appropriate values s pecified under DC E l ectric al Characteristics .
2. Per LVTLL driv en i nput . A and Y pins do not cont ri bute to ∆Icc.
3. This paramet er i s guaranteed but not tested.
4. This paramet er represents t he current required to switch i nternal capaci tance at t he specifi ed frequency. The A and Y inputs do not contribute to the
Dynamic Power Supply Current. This parameter is 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
ΩΩ
Ω 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 tested.
2. The bus switch contributes no propagation delay other than the RC del ay of the ON res i stance of the swit ch and the load c ap acitance. The time
const ant for the switch alone is of the order of 0.25ns at CL = 50pF. S i nce this t i m e constant i s much s m al l er than the rise and fall tim es of ty pi cal
driving s i gnal s, it adds very l i ttle propagati on del ay to the system. Propagation delay of the bus swi t ch, when used i n a system, is determined by the
driving c i rcuit on the dri ving side of the switch and its interac tion with t he l oad on the driven si de.
3. Mini m um s are guaranteed but not production tested.
4. Max i m um frequency for bidirect i onal data flow.
5. Max i m um toggle frequency for OE c ont 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 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 +5V
SINGLE HOT
SWITCH
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
CPU
RAM
PCI/COMPACT PCI
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLUGGABLE 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 Typ e
Blank
3VH125
Industrial (-40°C to +85°C)
3.3V Quad Active Low Switch for Hot Swap
Applications
Q
PG
S1
Quarter Size Outline Package (SO16-7)
Thin Sh rin k S mal l Outl in e Pa c k age (SO1 6- 10 )
Smal l O utline IC (SO1 4-1 )
