1
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
NOVEMBER 2001
2001 Integrated Device Technology, Inc. DSC-5774/1c
INDUSTRIAL TEMPERATURE RANGE
FUNCTIONAL BLOCK DIAGRAM
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
• PCI/Compact PCI hot-swapping
• 10/100 Base-T, Ethernet LAN switch
• Low distortion analog switch
• Replaces mechanical relay
• ATM 25/155 switching
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 - 4ΩΩ
ΩΩ
Ω 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 Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in QSOP and SOIC packages
IDTQS3VH126
QUICKSWITCH® PRODUCTS
3.3V QUAD ACTIVE HIGH SWITCH
FOR HOT SWAP APPLICATIONS
(HOTSWITCH™)
DESCRIPTION:
The QS3VH126 bus switch is specially designed for a hot-swapping
environment. The QS3VH126 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 high
Output Enable signals for bidirectional data flow with no added delay or
ground bounce. 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 QS3VH126 ideal for hot-swapping applica-
tions.
The QS3VH126 is characterized for operation from -40°C to +85°C.
4OE
1A
1Y2Y3Y4Y
2A3A4A
3OE
2OE
1OE
2
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
PIN CONFIGURATION
Pin Names I/ O Description
1A - 4AI /O Bus A
1Y - 4YI /O Bus Y
1OE - 4OE I Output Enable
PIN DESCRIPTION
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
OE A Y Function
H H H Connect
H L L Connect
L X X Disconnect
FUNCTION TABLE(1)
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
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
ABSOLUTE MAXIMUM RATINGS(1)
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 .
NOTE:
1. This parameter is guaranteed but not production tested.
Symbol Parameter(1) Typ. Max. Unit
CIN Control Inputs 3 5 pF
CI/O Quickswitch Channels (Switch OFF) 4 6 pF
CAPACITANCE (TA = +25°C, F = 1MHz, V IN = 0V, VOUT = 0V)
3
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
RON
(ohms)
VIN
(Volts)
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
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 — — ±1 µA
RON Switch ON Resistance VCC = Min, VIN = 0V, ION = 30mA — 4 6 Ω
VCC = Min, VIN = 2.4V, ION = 15mA — 5 8
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: TA = –40°C to +85°C, VCC = 3.3V ±0.3V
NOTE:
1. Typical values are at VCC = 3.3V and TA = 25°C.
4
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
NOTES:
1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics.
2. Per LVTTL-driven-control-input. A and Y 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 Y inputs do not contribute to the Dynamic Power Supply
Current. This parameter is guaranteed but not production tested.
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 = 3.6V, VIN = 3V, f = 0 per Control Input 30 µA
ICCD Dynamic Power Supply Current per MHz(4) VCC = 3.6V, A and Y Pins Open, per Control Input Toggling @ 50% Duty Cycle 0.25 mA/MHz
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 Data Propagation Delay(1,2) 0.2 ns
tPHL A to Y
tPZL Switch Turn-On Delay 1.5 9ns
tPZH OE to xA/xY
tPLZ Switch Turn-Off Delay(1) 1.5 8ns
tPHZ OE to xA/xY
fOE Operating Frequency - Enable(1,4) 1 MHz
NOTES:
1. This parameter is guaranteed but not production tested.
2. 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.
3. Minimums are guaranteed but not production tested.
4. Maximum toggle frequency for OE control input.
5
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
PHY
3VH
SWITCH
4.5VPP
LOGIC
SIDE Z = 1 00 Ω10Mbps to 100Mbps
2VPP
4.5VPP
LOGIC
SIDE
Z = 1 00 Ω
TW ISTED PAIR
>100m
CHARGE 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/C O MPAC T P C I
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLUG GAB LE CAR D/ LIVE SYSTEM ZERO DO WN TIME SYS TEM
Rail-to-Rail Switching
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
Fast Ethernet Data Switching (LAN Switch)
Hot-Swapping: PCI / Compact PCI
6
INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH126
3.3V QUAD ACTIVE HIGH SWITCH FOR HOT SWAP APPLICATIONS
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
IDTQS XXXXX XX
Package
De vice Type
3VH126 3.3V Q ua d Active High Sw itch for Hot Sw ap A pp lications
Q
S1 Qua rter S ize Outline Packa ge (SO 16-7)
Sm all Outline IC (SO14 -1)
