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Part: QS3251
Category:
Logic
-> Bus Switches
Description: High-speed CMOS Quickswitch 8:1 Mux/demux
Company: Integrated Device Technology, Inc.
Datasheet: Download QS3251 datasheet File size : 188 kB
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Datasheet text preview:
IDTQS3251 HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
QUICKSWITCH® PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
FEATURES:
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IDTQS3251
Enhanced N channel FET with no inherent diode to Vcc 5 bidirectional switches connect inputs to outputs Pin compatible with the 74F251, 74FCT251, and 74FCT251T Zero propagation delay, zero ground bounce Undershoot clamp diodes on all switch and control inputs TTL-compatible control inputs Available in SOIC and QSOP packages
DESCRIPTION:
The QS3251 is a high-speed CMOS TTL-compatible 8:1 multiplexer/ demultiplexer. The QS3251 has 3-state outputs. The QS3251 is a function and pinout compatible version of the 74F251, 74FCT251 and the 74ALS/ AS/LS251 8:1 multiplexers. The low ON resistance of the QS3251 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. Mux/Demux devices provide an order of magnitude faster speed than equivalent logic devices. The QS3251 is characterized for operation at -40°C to +85°C.
APPLICATIONS:
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Logic replacement Video, audio, graphics switching, muxing Hot-swapping, hot-docking Voltage translation (5V to 3.3V)
FUNCTIONAL BLOCK DIAGRAM
S0 S1 S2 E
I0 I1 I2 Y I3 I4 I5 I6 I7
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
c 2000 Integrated Device Technology, Inc.
FEBRUARY 2000
1
DSC-5754/1
IDTQS3251 HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM(2) VTERM(3) VTERM(3) VAC IOUT PMAX TSTG Description Supply Voltage to Ground DC Switch Voltage Vs DC Input Voltage VIN AC Input Voltage (pulse width 20ns) DC Output Current Maximum Power Dissipation (TA = 85°C) Storage Temperature Max 0.5 to +7 0.5 to +7 0.5 to +7 3 120 0.5 65 to +150 Unit V V V V mA W °C
I3 I2 I1 I0 Y NC E GND
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VCC I4 I5 I6 I7 S0 S1 S2
NOTE: 1 . Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2 . Vcc terminals. 3 . All terminals except Vcc.
CAPACITANCE (TA = +25°C, f = 1MHz, VIN = 0V, VOUT = 0V)
Pins Control Inputs Quickswitch Channels (Switch OFF) Demux Mux Typ. 4 5 21 Max. (1) 5 7 23 Unit pF pF
SOIC/ QSOP TOP VIEW
NOTE: 1 . This parameter is guaranteed but not production tested.
PIN DESCRIPTION
Pin Names I0 - I7 S0 - S2 E Y I/O I I I O Data Inputs Select Inputs Enable Input Data Output Description
FUNCTION TABLE(1)
Select E H L L L L L L L L S2 X L L L L H H H H S1 X L L H H L L H H S0 X L H L H L H L H Y Hi-Z I0 I1 I2 I3 I4 I5 I6 I7 Function Disable S2 - S 0 = 0 S2 - S 0 = 1 S2 - S 0 = 2 S2 - S 0 = 3 S2 - S 0 = 4 S2 - S 0 = 5 S2 - S 0 = 6 S2 - S 0 = 7
NOTE: 1 . H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care Z = High-Impedence
2
IDTQS3251 HIGH-SPEED CMOS QUICKSWITCH 8:1 MUX/DEMUX
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = 40°C to +85°C, VCC = 5.0V ±5%
Symbol VIH VIL IIN IO Z RON VP Parameter Input HIGH Level Input LOW Level Input LeakageCurrent (Control Inputs) Off-State Output Current (Hi-Z) Switch ON Resistance(2) Pass Voltage(3) Test Conditions Guaranteed Logic HIGH for Control Pins Guaranteed Logic LOW for Control Pins 0V VIN VCC 0V VOUT VCC VCC = Min., VIN = 0V, ION = 30mA VCC = Min., VIN = 2.4V, ION =15mA VIN = VCC = 5V, IOUT = -5µA Min. 2 -- -- -- -- -- 3.7 Typ.(1) -- -- -- -- 5 10 4 Max. -- 0.8 ±1 ±1 7 15 4.2 Unit V V µA µA V
NOTES: 1 . Typical values are at VCC = 5.0V, TA = 25°C. 2 . RON is guaranteed but not production tested. 3 . Pass Voltage is guaranteed but not production tested.
TYPICAL ON RESISTANCE vs VIN AT VCC = 5V
RON
(ohms)
16 14 12 10 8 6 4 2 0 0 .0 0 .5 1 .0 1 .5 2 .0 2 .5 3 .0 3 .5
V IN (Volts)
3
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QS-1 QS-2
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