QUALITY SEMICONDUCTOR, INC. QuickSwitch® Products High-Speed CMOS
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QS3244, QS32244
QUALITY SEMICONDUCTOR, INC.
QuickSwitch® Products High-Speed CMOS QuickSwitch® 8-Bit Switches
DESCRIPTION
QS3244 QS32244
Enhanced channel with inherent diode bidirectional switches connect inputs outputs compatible with 74F244, 74FCT244, 74FCT244T Zero propagation delay, zero ground bounce Undershoot clamp diodes switch control inputs Available SOIC (SO), QSOP QS32244 version noise
QS3244 QS32244 provide eight high-speed CMOS TTL-compatible switches pinout compatible with 74FCT244, 74F244, 74ALS/AS/LS244 8-bit drivers. resistance 3244 allows inputs connected outputs without adding propagation delay without generating additional ground bounce noise. enable (nG) signals turn switches similar signals 74'244. QS32244 device includes series termination resistors. QS32244 adds internal resistor reduce reflection noise high speed applications. When switch closed, acts source termination driver connected QuickSwitch devices provide order magnitude faster speed than conventional logic devices.
APPLICATIONS
Hot-docking, hot-swapping (Application Note AN-13) Logic replacement (data processing) Voltage translation 3.3V; Application Note AN-11) switching isolation Capacitance isolation reduction Power conservation Clock gating
Figure Functional Block Diagram
MDSL-00037-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3244, QS32244 Table Description
Name 1G/2G Description Output Enable Data I/Os Data I/OS
Configuration (All Pins View)
SOIC (SO), QSOP
Table Function Table
I/Os Disconnected Disconnected I/Os Disconnected 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 operatiion under absolute-maximum conditions implied.
Table Capacitance
25°C, 1MHz, VOUT Pins Control Pins QuickSwitch Channels (Switch OFF) SOIC, QSOP Unit
Note: Capacitance guaranteed, production tested typical values. total capacitance while switch please Section under "Input Switch Capacitance".
QUALITY SEMICONDUCTOR, INC.
MDSL-00037-02 JULY 1997
QS3244, QS32244 Table Electrical Characteristics Over Operating Range
-40°C 85°C, 5.0V Symbol Parameter Input HIGH Voltage Input Voltage Input Leakage Current(2) (Control Inputs) 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., 0.0V QS3244 30mA QS32244 Min., 2.4V QS3244 15mA QS32244 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 (QS3244)
(ohms)
(Volts)
Note: QS32244, shown.
MDSL-00037-02 JULY 1997
QUALITY SEMICONDUCTOR, INC.
QS3244, QS32244 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
Commercial: -40°C 85°C, 5.0V CLOAD 50pF, RLOAD unless otherwise noted.
1.25(3)
Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ
Description(1) Data Propagation Delay(2,3) Switch Turn-on Delay Switch Turn-off Delay(2)
QS3244 0.25(3)
QS32244
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 QS3244 1.25ns QS32244 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-00037-02 JULY 1997
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