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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
AUGUST 2001
2001 Integrated Device Technology, Inc. DSC-5859/6c
INDUSTRIAL TEMPERATURE RANGE
DESCRIPTION:
The QS3VH862 HotSwitch with 10-bit active high and low enable is a high
bandwidth bus switch. The QS3VH862 has very low ON resistance,
resulting in under 250ps propagation delay through the switch. The
switches are controlled by independent active low enable (BE) and active
high enable (BE) 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 QS3VH862 ideal for high perfor-
mance communications applications.
The QS3VH862 is characterized for operation from -40°C to +85°C.
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
APPLICATIONS:
• 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
– 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 - 4ΩΩ
ΩΩ
Ω 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 500MHz
• LVTTL-compatible control Inputs
• Undershoot Clamp Diodes on all switch and control Inputs
• Low I/O capacitance, 4pF typical
• Available in QSOP and TSSOP packages
IDTQS3VH862
PRELIMINARY
QUICKSWITCH® PRODUCTS
2.5V / 3.3V 10-BIT HIGH AND
LOW ENABLE, HIGH BANDWIDTH
BUS SWITCH
FUNCTIONAL BLOCK DIAGRAM
A0
A9
B0
B9
BE
BE
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
PIN CONFIGURATION Symbol Description Max Unit
VTERM(2) SupplyVoltage 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
IOUT DC Output Current (max. sink current/pin) 120 mA
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 .
Symbol Parameter(1) Typ. Max. Unit
CIN Control Inputs 3 5 pF
CI/O Quickswitch Channels (Switch OFF) 4 6 pF
CI/O Quickswitch Channels (Switch ON) 8 12 pF
CAPACITANCE (TA = +25°C, F = 1MHz, V IN = 0V, VOUT = 0V)
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedence
BE BE A0 - A9Function
L L Z Disconnect
L H Z Disconnect
HLB0 - B9Connect
H H Z Disconnect
FUNCTION TABLE(1)
NOTE:
1. This parameter is guaranteed but not production tested.
QSOP/ TSSOP
TOP VIEW
24BE VCC
1
23 BE
2
A0
223A1B0
214A2B1
205A3B2
196
A4B3
178
A6B5
169A7B6
1510A8B7
187A5B4
1411A9B8
13GND 12 B9
SO24-8
SO24-9
Pin Names Description
B E Active HIGH Bus Enable
BE Active LOW Bus Enable
A0 - A9Bus A
B0 - B9Bus B
PIN DESCRIPTION
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
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 VCC = 2.3V to 2.7V 1 . 7 — — V
for Control Inputs VCC = 2.7V to 3.6V 2 — —
VIL Input LOW Voltage Guaranteed Logic LOW VCC = 2.3V to 2.7V — — 0 . 7 V
for Control Inputs VCC = 2.7V to 3.6V — — 0 . 8
IIN Input Leakage Current (Control Inputs) 0V ≤ VIN ≤ VCC ——±1µA
IOZ Off-State Current (Hi-Z) 0V ≤ VOUT ≤ 5V, Switches OFF — — ± 1 µA
IOFF Data Input/Output Power Off Leakage VIN or VOUT 0V to 5V, V CC = 0V — — ±1 µA
VCC = 2.3V VIN = 0V ION = 30mA — 6 8
RON Switch ON Resistance Typical at VCC = 2.5V VIN = 1.7V ION = 15mA — 7 9 Ω
VCC = 3V VIN = 0V ION = 30mA — 4 6
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.
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
TYPICAL ICCD vs ENABLE FREQUENCY CURVE AT VCC = 3.3V
ICCD (mA)
ENABLE FREQUENCY (MHz)
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.
POWER SUPPLY CHARACTERISTICS
Symbol Parameter Test Conditions(1) Min. Typ. Max. Unit
ICCQ Quiescent Power Supply Current VCC = Max., VIN = GND or VCC, f = 0 — 1 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 (4) VCC = 3.3V, A and B Pins Open, Control Inputs See Typical ICCD vs Enable Frequency graph below
Toggling @ 50% Duty Cycle
0
2
4
6
8
10
12
0 2 4 6 8 10 12 14 16 18 20
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40°C to +85°C VCC = 2.5 ± 0.2V (1) VCC = 3.3 ± 0.3V (1)
Symbol Parameter Min. (4) Max. Min. (4) Max. Unit
tPLH Data Propagation Delay(2,3) 0.2 0.2 ns
tPHL A to B or B to A
tPZH Switch Turn-On Delay 1.5 8 1.5 7 ns
tPZL BE or BE to xA or xB
tPHZ Switch Turn-Off Delay 1.5 7 1.5 6.5 ns
tPLZ BE or BE to xA or xB
fBE or BE Operating Frequency - Enable(2,5) 10 20 MHz
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 BE or BE control input (pass voltage > VCC, VIN = 5V, RLOAD ≥ 1MΩ, no CLOAD).
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
PHY
3VH
SWITCH
4.5VPP
LOGIC
SIDE Z = 100 Ω10M bps to 100M b ps
2VPP
4.5VPP
LOGIC
SIDE
Z = 100 Ω
TWISTED PAIR
>100m
CH AR GE PU MP
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
BUS
CARD I/O ON CARD
LOGIC
CONNECTOR
QS3VHXXX
PLU GGABLE CARD/ LIVE SYSTEM ZERO DOWN TIME SYSTEM
Rail-to-Rail Switching
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
Fast Ethernet Data Switching (LAN Switch)
Hot-Swapping
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
TEST CIRCUITS AND WAVEFORMS
Open
VLOAD
GND
VCC
Pulse
Generator D.U.T.
500Ω
500Ω
CL
RT
VIN VOUT
(1 , 2 )
SAME PH ASE
IN PUT TR ANSITION
OPPOSITE PHASE
IN PUT TR ANSITION
0V
0V
VOH
VOL
tPLH tPHL
tPHL
tPLH
OUTPUT
VIH
VT
VT
VIH
VT
CONTROL
INPUT tPLZ 0V
OUTPUT
NORMALLY
LOW tPZH
0V
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE DISABLE
SWITCH
OPEN
tPHZ
0V
VOL + VLZ
VOH
VT
VT
tPZL
VLOAD/2 VLOAD/2
VIH
VT
VOL
VOH -VHZ
TEST CONDITIONS
Symbol VCC(1)= 3.3V ± 0.3V VCC(2)= 2.5V ± 0.2V Unit
VLOAD 6 2 x Vcc V
VIH 3 Vcc V
VT1.5 VCC/2 V
VLZ 300 150 mV
VHZ 300 150 mV
CL50 30 pF
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2ns.
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
SWITCH POSITION
Test Switch
tPLZ/tPZL VLOAD
tPHZ/tPZH GND
tPD Open
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
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INDUSTRIAL TEMPERATURE RANGE
IDTQS3VH862
2.5V / 3.3V 10-BIT ACTIVE HIGH AND LOW ENABLE, HIGH BANDWIDTH BUS SWITCH
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
Device Type
3VH862 2.5V / 3.3V 10-Bit A ctive High and Lo w Enab le,
H igh B andw idth S w itch
Q
PG Quarter Size Outline Package (SO24-8)
Thin Shrink Sm a ll Outline Package (SO24 -9)
