1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
OCTOBER 2001
2001 Integrated Device Technology, Inc. DSC-5597/1c
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
− High bandwidth - up to 500MHz
− LVTTL-compatible control Inp uts
− 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
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH125
3.3V QUAD ACTIVE LOW SWITCH FOR HOT SWAP APPLICATIONS
PIN CONFIGURATION
QSOP
TOP VIEW
SOIC
TOP VIEW
NC VCC
1OE 4OE
1A4A
1Y4Y
2OE 3OE
2A3A
2Y3Y
GND NC
SO16-7
1
2
3
4
5
6
7
89
10
11
12
13
14
15
16
VCC
1OE
4OE
1A
4A
1Y
4Y
2OE
3OE
2A
3A
2Y
3Y
SO14-1
1
2
3
4
5
6
78
9
10
11
12
13
14
GND
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
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 ex cept 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 paramet er i s guaranteed but not product ion test ed.
PIN DESCRIPTION
Pin Names I/O Description
1A - 4AI/O Bus A
1Y - 4YI/O Bus Y
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 Volt age Level
L = LOW Voltage 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
I
OZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ VCC, Switches OFF — — ±1 µA
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 T A = 25° C.
2. RON guaranteed but not production tested.
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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 condi t i ons shown as Mi n. or Max ., use the appropri ate val ues specified under DC El ectrical Characteristics .
2. Per LV TLL driven input. A and Y pins do not contribut e to ∆Icc.
3. This param et er is guaranteed but not tested.
4. This param et er represe nts the current required to switch i nternal c apacit ance at the specified frequency. The A and Y inp uts do not contribute to the
Dynam i c Power S uppl y Current. This parameter is guaran teed but not production tested.
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C
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
t
PHZ
tPLZ Switch Turn-Off Delay(1)
OE to nA/nY 1.5 8ns
f
OE Operating Frequency - Enable (1,4) 1MHz
NOTES:
1. This paramete r i s guaranteed but not producti on tested.
2. The bus switch contribut es no propagati on delay other than the RC del ay of the ON resi stance of the s witc h and the load capacitance. The time
cons tant for t he swit ch alone is of the order of 0.25ns at CL = 50pF. Sinc e this ti me constant is much sm al l er than the rise and fall ti m es of typical
driving signals, i t adds very little propagation delay to t he system. Propagation delay of the bus swi tch, when used i n a system, i s determ i ned by the
driving circui t on the driving side of the swi tch and i ts interacti on wi th the l oad on the d ri v en side.
3. Mini mums are guaranteed but not producti on tested.
4. Maximum toggle frequency for OE control input.
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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 MPA CT PC I
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
IDTQS XXXXX XX
Package
Device Type
3VH125 3.3 V Qu a d Act iv e Low Switch for Ho t Swap
Applications
S1
QSm all Outline IC (SO14-1)
Quarter Size Outline P ackage (SO16-7)
ORDERING INFORMATION
CORPORATE HEADQUARTERS for SALES: for Tech Support:
2975 Stender Way 800-345-7015 or 408-727-6116 logichelp@idt.com
Santa Clara, CA 95054 fax: 408-492-8674 (408) 654-6459
www.idt.com
