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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS 3.3V HIGH SPEED DOUBLEWIDTH BUS SWITCH
FEATURES:
* * * * * *
IDTQS32XV245
5 bidirectional switches connect inputs to outputs Pin compatibility with QS3245 250ps propagation delay Undershoot clamp diodes on all switch and control inputs LVTTL-compatible control inputs Available in 40-pin QVSOP package
DESCRIPTION:
APPLICATIONS:
* 3.3V to 2.5V Voltage translation * 2.5V to 1.8V Voltage translation * PCI bus isolation hot swap
The QS32XV245 is a 16-bit high speed bus switch controlled by LVTTLcompatible active low enable signal. When closed, the switches exhibit near zero propagation delay without generating additional ground bounce or switching noise. The QS32XV245 is specially designed for direct interface between 3.3V and 2.5V devices without any external components. When operating from a 3.3V supply, the logic high level at the switch output is clamped to 2.5V when the switch input signal exceeds 2.5V. This device can be used for switching 2.5V buses without signal attenuation. The ON resistance at 3.3V VCC is less than 5 typical, providing near zero propagation delay through the switch. Absence of DC path from switch I/O pins to VCC or ground makes QS32XV245 an ideal device for hot swapping applications. The QS32XV245 is characterized for operation from -40C to +85C.
FUNCTIONAL BLOCK DIAGRAM
A0 A1 A2 A3 A4 A5 A6 A7
OE1
B0
B1
B2
B3
B4
B5
B6
B7
A8
A9
A10
A11
A12
A13
A14
A15
OE2
B8
B9
B10
B11
B12
B13
B14
B15
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
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c 1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5579/1
IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
NC A0 A1 A2 A3 A4 A5 A6 A7 GND NC A8 A9 A10 A11 A12 A13 A14 A15 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VCC OE1 B0 B1 B2 B3 B4 B5 B6 B7 VCC OE2 B8 B9 B10 B11 B12 B13 B14 B15
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) VTERM(3) VAC IOUT PMAX TSTG Description Supply Voltage to Ground DC Switch Voltage Vs DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current Maximum Power Dissipation (TA = 85C) Storage Temperature Max -0.5 to +4.6 -0.5 to +4.6 -0.5 to +4.6 -3 120 0.6 -65 to +150 Unit V V V V mA W C
NOTE: 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
Pins Control Pins
(TA = +25C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
Typ. 4 5 Max.(1) 6 7 Unit pF pF
Quickswitch Channels (Switch OFF)
NOTE: 1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names OE An, Bn Output Enable Data I/Os Description
QVSOP TOP VIEW
FUNCTION TABLE(1)
OE1 H L H L OE2 H H L L A0 - A7 Z B0 - B7 Z B0 - B7 A8 - A15 Z Z B8 - B15 B8 - B15 Function Disconnect Connect Connect Connect
NOTE: 1. H = HIGH Voltage Level L = LOW Voltage Level Z = High-Impedance
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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH 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 RON Parameter Input HIGH Level Input LOW Level Input LeakageCurrent (Control Inputs) Off-State Output Current (Hi-Z) Switch ON Resistance Test Conditions Guaranteed Logic HIGH for Control Pins Guaranteed Logic LOW for Control Pins 0V VIN VCC 0V VOUT VCC, Switches OFF VCC = Min., VIN = 0V, ION = 8mA VCC = Min., VIN = 1.7V, ION = 8mA VCC = 2.3V, VIN = 0V, ION = 8mA VCC = 2.3V, VIN = 1.3V, ION = 8mA VIN = VCC = 3.3V, IOUT = -5A VIN = VCC = 2.5V, IOUT = -5A Min. 2 -- -- -- -- -- -- -- 2.5 -- Typ.(1) -- -- -- 0.001 5 15 7 25 2.7 1.8 Max. -- 0.8 1 1 7 20 -- -- 2.9 -- Unit V V A A
VP
Pass Voltage(2)
V
NOTES: 1. Typical values are at VCC = 3.3V, TA = 25C. 2. Pass Voltage is guaranteed but not production tested.
POWER SUPPLY CHARACTERISTICS
Symbol ICCQ ICC ICCD Parameter Quiescent Power Supply Current Power Supply Current per Control Input HIGH (2) Dynamic Power Supply Current per MHz(3) Test Conditions(1) VCC = Max., VIN = GND or Vcc, f = 0 VCC = Max., VIN = 3.4V, f = 0 VCC = Max., A and B pins open Control Inputs Toggling at 50% Duty Cycle
NOTES: 1. For conditions shown as Min. or Max., use the appropriate values specified under DC Electrical Characteristics. 2. Per TLL driven input (VIN = 3.4V, control inputs only). A and B pins do not contribute to Icc. 3. This current applies to the control inputs only and represents the current required to switch internal capacitance at the specified frequency. The A and B inputs generate no significant AC or DC currents as they transition. This parameter is guaranteed but not production tested.
Max. 6 50 0.15
Unit A A mA/MHz
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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C, VCC = 3.3V 0.3V CLOAD = 50pF, RLOAD = 500 unless otherwise noted.
Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Data Propagation Delay (2,3) An to/from Bn Switch Turn-on Delay OEn to An/Bn Switch Turn-off Delay (2) OEn to An/Bn 0.5 -- 4
ns
Parameter
Min. (1) -- 0.5
Typ. -- --
Max. 0.25 6.5
Unit
ns ns
NOTES: 1. Minimums are guaranteed but not production tested. 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 0.25ns for CL = 30pF. 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.
TYPICAL ON RESISTANCE vs VIN AT VCC = 3.3V
16 14 12 10
RON - (ohms )
8 6 4 2 0 0. 0.5 1 VIN - (Volts) 1.5 2 2.5
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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
OUTPUT VI CHARACTERISTICS
V O U T (V o lts ) 1 250 200
IOs - (mA)
2
3
4
-5 0 -1 0 0
IO s - (mA)
150 100 50 0 0 0 .5 1 V O U T ( V o lts ) 1 .5 2
-1 5 0 -2 0 0 -2 5 0 -3 0 0
Outputs Low Characteristic
Outputs High Characteristic
PASS VOLTAGE vs VCC
3 2.5
VOUT = 2.5V @ VCC = 3.3V VOUT = 1.8V @ VCC = 2.5V
VOUT - (Volts)
2
1.5 2.2 2.4 2.7 3 VCC (V) 3.3 3.6
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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
3.3V TO 2.5V VOLTAGE TRANSLATION
3.3V
VOUT 2.5V Switch Output
3.3V Supply
3.3V QS32XV245 2.5V
2.5V
2.5V
0V Switch Input
VIN 3.3V
2.5V TO 1.8V VOLTAGE TRANSLATION
2.5V VOUT 2.5V QS32XV245 1.8V 1.8V 1.8V 1.8V Switch Output 2.5V Supply
VIN 0V 2.5V Switch Input
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IDTQS32XV245 3.3V HIGH SPEED DOUBLE-WIDTH BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package X Process
Blank
Industrial (-40C to +85C )
Q2
40-Pin QVSOP
32XV245
3.3V High Speed Double-W idth Bus Switch
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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