QuickSwitch® Products High-Speed CMOS QuickSwitch® 8-Bit Switches
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QS3245, QS32245
QuickSwitch® Products High-Speed CMOS QuickSwitch® 8-Bit Switches
Enhanced channel with inherent diode bidirectional switches connect inputs outputs compatible with 74F245, 74FCT245, 74FCT245T power CMOS proprietary technology Zero propagation delay, zero ground bounce Undershoot clamp diodes switch control inputs QS32245 version noise TTL-compatible control inputs Available TSSOP, SOIC, QSOP HQSOP
QS3245 QS32245
DESCRIPTION
QS3245 QS32245 provide eight high-speed CMOS TTL-compatible switches pinout compatible with 74FCT245, 74F245, 74ALS/ AS/LS245 8-bit transceivers. resistance 3245 allows inputs connected outputs without adding propagation delay without generating additional ground bounce noise. Output Enable (OE) signal turns switches similar signal 74'245. QS32245 series resistors reduce ground bounce noise. QuickSwitch devices provide order magnitude faster speed than conventional logic devices.
APPLICATIONS
Hot-docking, hot-swapping (Application Note AN-13) Voltage translation 3.3V; Application Note AN-11) Logic replacement (data processing) Power conservation Capacitance reduction, isolation isolation Clock gating
Figure Functional Block Diagram
MDSL-00038-05 OCTOBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3245, QS32245 Table Description
Name Description Output Enable Data I/Os Data I/OS TSSOP, SOIC, QSOP, HQSOP
Figure Configuration (All Pins View)
Table Function Table
Outputs Disconnected
Table Absolute Maximum Ratings
Supply Voltage Ground -0.5V 7.0V Switch Voltage -0.5V 7.0V Input Voltage -0.5V 7.0V Input Voltage (for pulse width 20ns) -3.0V Output Current Max. Sink Current/Pin 120mA Maximum Power Dissipation watts TSTG Storage Temperature -65° 150°C
Pins
Note: ABSOLUTE MAXIMUM CONTINUOUS RATINGS those values beyond which damage device occur. Exposure these conditions conditions beyond those indicated adversely affect device reliability. Functional operation under absolute-maximum conditions implied.
Table Capacitance
25°C, 1MHz, VOUT QSOP, SOIC Unit
Note: Capacitance guaranteed production tested. total capacitance while switch please Section under "Input Switch Capacitance".
Control Inputs QuickSwitch Channels (Switch OFF)
QUALITY SEMICONDUCTOR, INC.
MDSL-00038-05 OCTOBER 1998
QS3245, QS32245 Table Electrical Characteristics Over Operating Range
Commerical: -40°C 85°C, 5.0V Military: -55°C 125°C, 5.0V ±10% Symbol Parameter Input HIGH Voltage Input Voltage Input Leakage Current (Control Inputs) Off-State Current (Hi-Z) Switch Resistance(2) Switch Resistance(2) Pass Voltage(3) Test Conditions Guaranteed Logic HIGH Control Inputs Guaranteed Logic Control Inputs VOUT VCC, Switches Min., 0.0V 30mA Min., 2.4V 15mA 3245 32245 3245 32245 Typ(1) 0.001 Unit
IOUT -5µA
Notes: Typical values indicate 5.0V 25°C. diagram explaining procedure measurement, please Section under Electrical Characteristics." value guaranteed, production tested. Pass voltage guaranteed, production tested.
Figure Typical Resistance 5.0V (QS3245)
(ohms)
(Volts)
Note: QS32245, shown.
MDSL-00038-05 OCTOBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3245, QS32245 Table Power Supply Characteristics
Commercial: -40°C 85°C, 5.0V Military: -55°C 125°C, 5.0V ±10% Symbol ICCQ QCCD Parameter Quiescent Power Supply Current Power Supply Current(2) Input HIGH Dynamic Power Supply Current MHz(3) Test Conditions(1) Max., VCC, Max., 3.4V, Control Input Max., Pins Open, Controls Inputs Toggling Duty Cycle 0.25 Unit
Notes: conditions shown Min. Max., appropriate values specified under specifications. driven input (VIN 3.4V, control inputs only). pins contribute ICC. This current applies control inputs only represents current required switch internal capacitance specified frequency. inputs generate significant currents they transition. This parameter guaranteed, production tested.
Table Switching Characteristics Over Operating Range
Commercial: -40°C 85°C, 5.0V Military: -55°C 125°C, 5.0V ±10% CLOAD 50pF, RLOAD unless otherwise noted. Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Description(1) Data Propagation Delay(2,3) to/from Switch Turn-on Delay An/Bn
QS3245 0.25 0.75
QS32245 1.25
Unit
Switch Turn-off Delay(2) An/Bn
Notes: Test Circuit Waveforms. Minimums guaranteed, production tested. This parameter guaranteed, production tested. switch contributes propagation delay other than delay resistance switch load capacitance. time constant switch alone order 0.25ns QS3245 1.25ns QS32245 50pF. Since this time constant much smaller than rise/fall times typical driving signals, adds very little propagation delay system. Propagation delay switch when used system determined driving circuit driving side switch interaction with load driven side.
QUALITY SEMICONDUCTOR, INC.
MDSL-00038-05 OCTOBER 1998
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