QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS

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QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS

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QS3R245
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS QuickSwitch® 8-Bit Resistance Switches
DESCRIPTION
QS3R245
Enhanced channel with inherent diode bidirectional switches connect inputs outputs compatible with 74F245, 74FCT245, 74FCT245T Zero propagation delay, zero ground bounce Undershoot clamp diodes switch control inputs TTL-compatible control inputs Available SOIC (SO), QSOP
QS3R245 provides 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. resistance QS3R245 makes ideal docking application. QuickSwitch devices provide order magnitude faster speed than conventional logic devices.
APPLICATIONS
Hot-docking, hot-swapping (Application Note AN-13) resistance compact swapping switching isolation Voltage translation 3.3V; Application Note AN-11) Capacitance isolation reduction Power conservation Logic replacement (data processing) Clock gating
Figure Functional Block Diagram
MDSL-00252-02 NOVEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3R245 Table Description
Name Description Output Enable Data I/Os Data I/OS
Figure Configuration (All Pins View)
SOIC (SO), QSOP
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
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 Pins Control Inputs QuickSwitch Channels (Switch OFF) QSOP, SOIC Unit
Note: Capacitance guaranteed production tested. total capacitance while switch please Section under "Input Switch Capacitance".
QUALITY SEMICONDUCTOR, INC.
MDSL-00252-02 NOVEMBER 1998
QS3R245 Table Electrical Characteristics Over Operating Range
Commerical: -40°C 85°C, 5.0V ±10% Symbol Parameter Input HIGH Voltage Input Voltage Input Leakage Current (Control Input) 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., 30mA Min., 15mA IOUT -5µA Typ(1) 0.001 Unit
Notes: Typical values indicate 5.0V 25°C. total capacitance while switch please Section under "Input Switch Capacitance". value guaranteed, production tested. Pass voltage guaranteed, production tested.
Figure Typical Resistance 5.0V
(ohms)
(Volts)
MDSL-00252-02 NOVEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3R245 Table Power Supply Characteristics
Commercial: -40°C 85°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 Input 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 ±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
0.12(3)
Unit
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 0.12ns QS3R245 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.
Switch Turn-off Delay(2) An/Bn
QUALITY SEMICONDUCTOR, INC.
MDSL-00252-02 NOVEMBER 1998

QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS

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