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IDTQS3R245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH(R) PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
FEATURES:
* * * * * * *
IDTQS3R245
DESCRIPTION:
Enhanced N channel FET with no inherent diode to Vcc 5 bidirectional switches connect inputs to outputs Pin compatible with the 74F245, 74FCT245, and 74FCT245T Zero propagation delay, zero ground bounce Undershoot clamp diodes on all switch and control inputs TTL-compatible control inputs Available in SOIC and QSOP packages
APPLICATIONS:
The QS3R245 provides a set of eight high-speed CMOS TTL-compatible bus switches in a pinout compatible with 74FCT245, 74F245, 74ALS/AS/ LS245 8-bit transceivers. The low ON resistance of the QS3R245 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The Output Enable (OE) signal turns the switches on similar to the OE signal of the 74'245. The low ON resistance of QS3R245 makes it ideal for PCI hot docking applications. QuickSwitch devices provide an order of magnitude faster speed than conventional logic devices. The QS3R245 is characterized for operation at -40C to +85C.
* Hot-swapping and hot-docking (low resistance for PCI and Compact PCI applications) * Bus switching and isolation * Voltage translation (5V to 3.3V) * Capacitance reduction and isolation * Power conservation * Logic replacement (data processing) * Clock gating
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
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c 1999 Integrated Device Technology, Inc.
NOVEMBER 1999
DSC-5546/1
IDTQS3R245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) 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 Storage Temperature Max -0.5 to +7 -0.5 to +7 -0.5 to +7 -3 120 0.5 -65 to +150 Unit V V V V mA W C VTERM(3) VTERM(3) VAC IOUT PMAX TSTG
NC A0 A1 A2 A3 A4 A5 A6 A7 GND
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC OE B0 B1 B2 B3 B4 B5 B6 B7
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
SOIC/ QSOP/ TSSOP TOP VIEW
Pins Control Pins
(TA = +25C, f = 1.0MHZ, VIN = 0V, VOUT = 0V)
Typ. 3 5 Max.(1) 4 6 Unit pF pF
Quickswitch Channels (Switch OFF)
NOTE: 1. This parameter is measured at characterization but not 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
Outputs Disconnected Ax = Bx
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IDTQS3R245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 10%
Symbol VIH VIL IIN IOZ RON VP Parameter Input HIGH Level Input LOW Level Input LeakageCurrent (Control Inputs) Off-State Output Current (Hi-Z) Switch ON Resistance(2) Pass Voltage(3) 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 = 30mA VCC = Min., VIN = 2.4V, ION =15mA VIN = VCC = 5V, IOUT = -5A Min. 2 -- -- -- -- -- 3.7 Typ.(1) -- -- -- 0.001 2.5 4 4 Max. -- 0.8 1 1 5 8.5 4.3 Unit V V A A V
NOTES: 1. Typical values are at VCC = 5.0V, TA = 25C. 2. Max value of RON is guaranteed but not tested. 3. Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
16
RON
(ohms)
14 12 10 8 6 4 2 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
VIN
(Volts)
3
IDTQS3R245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
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. 3 2.5 0.25
Unit A mA mA/MHz
SWITCHING CHARACTERISTICS OVER OPERATING RANGE
TA = -40C to +85C, VCC = 5.0V 10%; 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 OE to Ax/Bx Switch Turn-off Delay (2) OE to Ax/Bx 0.5 -- 4.5
ns
Parameter
Min. (1) -- 0.5
Typ. -- --
Max. 0.12 5.6
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 0.12ns for 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.
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IDTQS3R245 HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDTQS XXXXX Device Type XX Package X Process
Blank
Industrial (-40C to +85C)
SO Q
Small Outline IC Quarter Size Outline Package
3R245
High Speed Quickswitch 8-Bit Low Resistance 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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