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IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
IDTQS3VH2245
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 * 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 * LVTTL-compatible control Inputs * Undershoot Clamp Diodes on all switch and control Inputs * Low I/O capacitance, 4pF typical * 25 resistors for low noise and line matching * Available in QSOP and TSSOP packages
DESCRIPTION:
The QS3VH2245 is a high bandwidth 8-bit bus switch. The QS3VH2245, with 25 ON resistance and 1.35ns propagation delay, is ideal for line matching and low noise environments. The switches can be turned ON under the control of the LVTTL-compatible Output Enable signal 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 small propagation delay, high OFF impedance, and over-voltage tolerance makes the QS3VH2245 ideal for high performance communication applications. The QS3VH2245 is characterized for operation from -40C to +85C.
APPLICATIONS:
* * * *
Hot-swapping Low distortion analog switch Replaces mechanical relay ATM 25/155 switching
FUNCTIONAL BLOCK DIAGRAM
A0
A1
A2
A3
A4
A5
A6
A7
OE
B0
B1
B2
B3
B4
B5
B6
B7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c 2003 Integrated Device Technology, Inc.
MARCH 2003
DSC-5591/6
IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) Description Max SupplyVoltage to Ground DC Switch Voltage VS DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current (max. sink current/pin) Storage Temperature -0.5 to +4.6 -0.5 to +5.5 -0.5 to +5.5 -3 120 -65 to +150
Unit V V V V mA C
NC A0 A1 A2 A3 A4 A5 A6 A7 GND
1 2 3 4 5 6 7 8 9 1 0
2 0 1 9 1 8 1 7 1 6 1 5 1 4 1 3 1 2 1 1
VCC OE B0 B1 B2 B3 B4 B5 B6 B7
VTERM(3) VAC IOUT TSTG
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 = +25C, F = 1MHz, VIN = 0V, VOUT = 0V)
Symbol CIN CI/O CI/O Parameter(1) Control Inputs Quickswitch Channels (Switch OFF) Quickswitch Channels (Switch ON) Typ. 3 4 8 Max. 5 6 12 Unit pF pF pF
QSOP/ TSSOP TOP VIEW
NOTE: 1. This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names OE Ax Bx Output Enable Data I/Os Data I/Os Description
FUNCTION TABLE(1)
OE H L
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level
Function Disconnected Connect (Ax = Bx)
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IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 3.3V 0.3V
Symbol VIH VIL IIN IOZ IOFF RON Parameter Input HIGH Voltage Input LOW Voltage Input Leakage Current (Control Inputs) Off-State Current (Hi-Z) Data Input/Output Power Off Leakage Switch ON Resistance for Control Inputs Guaranteed Logic LOW for Control Inputs 0V VIN VCC 0V VOUT 5V, Switches OFF VIN or VOUT 0V to 5V, VCC = 0V VCC = 2.3V Typical at VCC = 2.5V VCC = 3V
NOTE: 1. Typical values are at VCC = 3.3V and TA = 25C.
Test Conditions Guaranteed Logic HIGH VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V VCC = 2.3V to 2.7V VCC = 2.7V to 3.6V
Min. 1.7 2 -- -- -- -- --
Typ.(1) Max. -- -- -- -- -- -- -- 27 28 25 26 -- -- 0.7 0.8 1 1 1 39 41 38 40
Unit V V A A A
VIN = 0V VIN = 1.7V VIN = 0V VIN = 2.4V
ION = 30mA ION = 15mA ION = 30mA ION = 15mA
18 18 18 18
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
40
RON
(ohms)
35 30 25 20 15 10 5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
VIN
(Volts)
3
IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current (2,3) per Input HIGH Dynamic Power Supply Current
(4)
Test Conditions(1) VCC = Max., VIN = GND or VCC, f = 0 VCC = Max., VIN = 3V, f = 0 per Control Input Toggling @ 50% Duty Cycle
Min. -- --
Typ. 1 --
Max. 3 30
Unit mA A
VCC = 3.3V, A and B Pins Open, Control Inputs See Typical ICCD vs Enable Frequency graph below
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.
TYPICAL ICCD vs ENABLE FREQUENCY CURVE AT VCC = 3.3V
12
10
8
ICCD (mA)
6
4
2
0 0 2 4 6 8 10 12 14 16 18 20
ENABLE FREQUENCY (MHz)
4
IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C
VCC = 2.5 0.2V (1) Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ fOE Parameter Data Propagation Delay(2,3) Ax to/from Bx Switch Turn-On Delay OE to Ax/Bx Switch Turn-Off Delay OE to Ax/Bx Operating Frequency - Enable, Select(2,5) Min. (4) VCC = 3.3 0.3V (1) Min. (4) 1.5 1.5 Max. 1.35 8 7.5 20 Unit ns ns ns MHz Max. 0.9 9 7.5 10
1.5 1.5
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 1.35ns 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 OE control input (pass voltage > VCC, VIN = 5V, RLOAD 1M, no CLOAD).
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IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SOME APPLICATIONS FOR HOTSWITCH PRODUCTS
0 to +5V
N FET
0 to +5V
Vcc = 3.3V
CHAR GE PUM P
+6.5V
OE
D RIVER SINGLE HOT SW ITCH
Rail-to-Rail Switching
PLUG GABLE C AR D / LIVE SYSTEM CONN ECTOR
ZERO DO W N TIM E SYSTEM QS3VH XXX
CARD I/O
ON C ARD LOGIC
CPU
CONN ECTOR
QS3VH XXX
CARD I/O
ON C ARD LOGIC
R AM
BUS
Hot-Swapping 6
IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS TEST CONDITIONS
Symbol VLOAD VIH VT VLZ VHZ CL VCC = 3.3V 0.3V
(1)
VCC = 2.5V 0.2V
(2)
Unit V V V mV mV pF
SAM E PHASE INPUT TRANSITION tPLH OUTPUT tPLH O PPOSITE PHASE INPUT TRANSITION tPHL tPHL
VIH VT 0V VOH VT VOL VIH VT 0V
6 3 1.5 300 300 50
2 x Vcc Vcc VCC/2 150 150 30
Propagation Delay
VCC 500 Pulse Generator
(1, 2)
VLOAD ENABLE Open G ND CONTRO L INPUT tPZL OUTPUT SW ITCH NORMALLY CLO SED LOW tPZH OUTPUT SW ITCH NORMALLY OPEN HIGH VLOAD/2 VT
DISABLE
VIH VT 0V VLOAD/2 VOL VOL VOH VOH 0V
+
VIN D.U.T.
VOUT
tPLZ
VLZ
RT
500 CL
tPHZ VT 0V
-V H Z
Test Circuits for All Outputs
NOTE: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator. 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.
Enable and Disable Times
SWITCH POSITION
Test tPLZ/tPZL tPHZ/tPZH
tPD
Switch VLOAD GND Open
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IDTQS3VH2245 2.5V / 3.3V 8-BIT HIGH BANDWIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package
Q PA
Quarter Size Outline Package Thin Shrink Small Outline Package
3VH2245
2.5V / 3.3V 8-Bit High Bandwidth Bus Switch
DATA SHEET DOCUMENT HISTORY
8/6/2002 3/3/2003 Updated according to PCN Logic-0206-11 Changed Icc limits
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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