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

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

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QS3257, QS32257
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS QuickSwitch Quad Mux/Demux
DESCRIPTION
QS3257 QS32257
Enhanced channel with inherent diode bidirectional switches connect inputs outputs compatible with 74F257, 74FCT257, 74FCT257T Zero propagation delay, zero ground bounce TTL-compatible control inputs Undershoot clamp diodes switch control pins Available SOIC (S1), QSOP QS32257 version noise
QS3257 high-speed CMOS LVTTL-compatible Quad multiplexer/demultiplexer. QS3257 function pinout compatible QuickSwitch version 74F257, 74FCT257, 74ALS/ AS/LS257 Quad multiplexers. resistance QS3257 allows inputs connected outputs without adding propagation delay without generating additional ground bounce noise. QS32257 series resistors reduce ground bounce noise. Mux/Demux devices provide order magnitude faster speed than equivalent logic devices.
APPLICATIONS
Logic replacement Video, audio, graphics switching, muxing Hot-swapping, hot-docking (Application Note AN-13) Voltage translation 3.3V; Application Note funneling
Figure Functional Block Diagram
MDSL-00044-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3257, QS32257 Table Description
Name YA-YD Description Data Inputs Select Input Enable Input Data Outputs
Figure Configuration (All Pins View)
SOIC (S1), QSOP
Table Function Table
Inputs Hi-Z Outputs Hi-Z Hi-Z Hi-Z Function Disable Select Select
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) Demux SOIC, QSOP Unit
Note: Capacitance guaranteed, production tested typical values. total capacitance while switch please Section under "Input Switch Capacitance."
QUALITY SEMICONDUCTOR, INC.
MDSL-00044-02 JULY 1997
QS3257, QS32257 Table Electrical Characteristics Over Operating Range
Commercial -40°C +85°C, 5.0V Military: -55°C 125°C, 5.0V 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 Pins Guaranteed Logic Control Pins VOUT Min., 0.0V 30mA Min., 2.4V 15mA QS3257 QS32257 QS3257 QS32257 Typ(1) Unit
IOUT -5µA
Notes: Typical values indicate 5.0V 25°C. diagram explaining procedure measurement, please Section under Electrical Characteristics." guaranteed, production tested. Pass voltage guaranteed, production tested.
Figure Typical Resistance 5.0V (QS3257)
(ohms)
(Volts)
Note: QS32257, shown.
MDSL-00044-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3257, QS32257 Table Power Supply Characteristics Over Operating Range
-40°C +85°C, 5.0V 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, Control 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 parameter 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
-40°C +85°C, 5.0V CLOAD 50pF, RLOAD unless otherwise noted. QS3257 Symbol tPLH tPHL tPZH tPZL tPZH tPZL tPHZ tPLZ Description
(2,3)
0.25
1.25
QS32257 Unit
Switch Turn-on Delay Switch Turn-on Delay
Data Propagation Delays
Switch Turn-off Delay(2)
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 QS3257 1.25ns QS32257 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-00044-02 JULY 1997

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

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