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

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

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QS3251
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS QuickSwitch Mux/Demux
DESCRIPTION
QS3251
Enhanced channel with inherent diode bidirectional switches connect inputs outputs compatible with 74F251, 74FCT251, 74FCT251T Zero propagation delay, zero ground bounce TTL-compatible control inputs Undershoot clamp diodes switch control pins Available SOIC (S1), QSOP
QS3251 high-speed CMOS TTL-compatible multiplexer/demultiplexer. QS3251 3-state outputs. QS3251 function pinout compatible version 74F251, 74FCT251 74ALS/AS/LS251 multiplexers. resistance QS3251 allows inputs connected outputs without adding propagation delay without generating additional 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 AN-11)
Figure Functional Block Diagram
MDSL-00042-01 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3251 Table Description
Name I7-I0 S2-S0 Description Data Inputs Select Inputs Enable Input Data Output
Figure Configuration (All Pins View)
SOIC (S1), QSOP
Table Function Table
Select 3251 Hi-Z Function Disable S2-S0 S2-S0 S2-S0 S2-S0 S2-S0 S2-S0 S2-S0 S2-S0
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 guraranteed, production tested typical values. total capacitance while switch please Section under "Input Switch Capacitance."
QUALITY SEMICONDUCTOR, INC.
MDSL-00042-01 JULY 1997
QS3251 Table Electrical Characteristics Over Operating Range
-40°C +85°C, 5.0V Symbol Parameter Input HIGH Voltage Input Voltage Input Leakage Current (Control Inputs) Off-State Current (Hi-Z) Switch Resistance
Test Conditions Guaranteed Logic HIGH Control Inputs Guaranteed Logic Control Inputs VOUT Min., 0.0V 30mA Min., 2.4V 15mA IOUT -5µA
Typ(1)
Unit
Switch Resistance(2) Pass Voltage(3)
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
(ohms)
(Volts)
MDSL-00042-01 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3251 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, 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
-40°C +85°C, 5.0V CLOAD 50pF, RLOAD unless otherwise noted.
Symbol tPLH tPHL
Description
0.25(3) Unit
QS3251
tPZL tPZH tPZL tPZH tPLZ tPHZ
Data Propagation Delay(2,3) Switch Turn-on Delay Switch Turn-on Delay(2) Switch Turn-off Delay
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 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-00042-01 JULY 1997

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

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