QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS
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QS3800
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS 10-Bit QuickSwitch with Precharged Outputs
DESCRIPTION
QS3800
bidirectional switches connect inputs outputs Zero propagation delay Undershoot clamp diodes switch control pins Outputs precharge voltage minimize signal distortion during live insertion TTL-compatible input output levels Zero ground bounce Available 24-pin SOIC, QSOP TSSOP
QS3800 10-bit high-speed CMOS switch controlled single enable (ON) input. When LOW, switch port connected port When HIGH, switch between port port open port precharged Bias voltage. resistance QS3800 allows inputs connected outputs without adding propagation delay without generating additional noise. QS3800 also precharges port user-selectable bias voltage minimize live-insertion noise which uselful applications.
Figure Functional Block Diagram
VBIAS
MDSL-00086-01 DECEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3800 Table Description
Name A0-A9 B0-B9 VBIAS Function Switch Enable Bias Voltage
Figure Configuration (All Pins View)
SOIC, QSOP, TSSOP VBIAS
Table Function Table
B0-B9 A0-A9 VBIAS Function Connect Disconnect
Table Absolute Maximum Ratings
Supply Voltage Ground -0.5V 7.0V Bias Voltage Range, BIAS -0.5V Input Voltage -0.5V 0.5V Input Voltage (for pulse width 20ns) -3.0V Output Current Max. Sink Current/Pin 128mA Input Clamp Current -50mA 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, QSOP, SOIC TSSOP
Unit
Control Inputs QuickSwitch Channels (Switch OFF)
Note: Capacitance characterized tested. total capacitance while switch please Section under "input switch capacitance."
QUALITY SEMICONDUCTOR, INC.
MDSL-00086-01 DECEMBER 1998
QS3800 Table Electrical Characteristics Over Operating Range
Commercial: -40°C 85°C, 5.0V ±10% Symbol VBIAS Parameter Input HIGH Voltage Input Voltage Bias Voltage Bias Current Input Leakage Current (Control inputs) Off-State Current (Hi-Z) Switch Resistance(2) Switch Resistance(2) Test Conditions Guaranteed Logic HIGH Control Inputs Guaranteed Logic Control Inputs 4.5V, VBIAS 2.4V, High VOUT Min., 0.0V 30mA Min., 2.4V 0.25 Typ(1) Unit
Notes: Typical values indicate 5.0V 25°C. diagram explaining procedure measurement, please Section1 under Electrical Characteristics." Max. value guaranteed characterization, production tested.
Figure Typical Resistance 5.0V
(ohms)
(Volts)
MDSL-00086-01 DECEMBER 1998
QUALITY SEMICONDUCTOR, INC.
QS3800 Table Power Supply Characteristics Over Operating Range
-40°C 85°C, 5.0V ±10% Symbol ICCQ QCCD Parameter Quiescent Power Supply Current Power Supply Current Input HIGH Dynamic Power Supply Current MHz(4) Test Conditions(1) Max., VCC, Max., 3.4V(3), Control Input Max., Pins Open, Data Inputs GND, Control Inputs Toggling Duty Cycle Typ(2) 0.25 Unit
Notes: conditions shown Min. Max., appropriate values specified under specifications. Typical Values 5.0V, 25°C Ambient. 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 design, 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 tPLZ tPHZ Description(1)
0.25(3)
tPZH
Data Propagation Delay(2,3) Switch Turn-on Delay Switch Turn-off Delay(2) VBIAS VBIAS VBIAS VBAIS
Test Conditions
Unit
Notes: Test Circuit Waveforms. Minimums guaranteed tested. This parameter guaranteed design 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-00086-01 DECEMBER 1998
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