QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS
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QS33X257
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS QuickSwitch 24:12 Mux/Demux
DESCRIPTION
QS33X257
Enhanced channel with inherent diode Bidirectional signal flow 24:12 Mux/Demux switches connect inputs outputs Individual controls each bank Zero propagation delay, zero ground bounce Undershoot clamp diodes control switch pins TTL-compatible control inputs Available 48-pin QVSOP (Q1)
QS33X257 high-speed CMOS TTL-compatible 24:12 multiplexer/demultiplexer. QS33X257 functionally compatible three QuickSwitch version 74F257, 74FCT257, 74ALS/ AS/LS257 Quad multiplexers. resistance QS33X257 allows inputs connected outputs without adding propagation delay without generating additional ground bounce noise. This part will used wide multiplexing where board space premium. 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) funneling
Figure Functional Block Diagram
MDSL-00112-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS33X257 Table Description
Name YA-YL Description Data Inputs Select Input Enable Input Data Outputs
Figure Configuration (All Pins View)
QVSOP (Q1)
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
Pins Control Inputs QuickSwitch Channels (Switch OFF) Demux QVSOP Unit
Note: Capacitance guaranteed, tested typical values. total capacitance while switch please Section under "Input Switch Capacitance."
QUALITY SEMICONDUCTOR, INC.
MDSL-00112-02 JULY 1997
QS33X257 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(2) Pass Voltage
Test Conditions Guaranteed Logic HIGH Control Pins Guaranteed Logic Control Pins VOUT Min., 0.0V, 30mA Min., 2.4V, 15mA IOUT -5µA
Typ(1)
Unit
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-00112-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS33X257 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 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 tPZH tPZL tPZH tPZL tPHZ tPLZ
Description(1) Data Propagation Delays(2,3) Switch Turn-on Delay Switch Turn-on Delay Switch Turn-off Delay(2)
0.25(3)
QS33X257
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 0.25ns 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-00112-02 JULY 1997
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