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IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
FEATURES:
* * * * * * *
IDTQS74FCT251AT
DESCRIPTION:
CMOS power levels: <7.5mW static Undershoot clamp diodes on all inputs True TTL input and output compatibility Ground bounce controlled outputs Reduced output swing of 0 to 3.5V IOL = 48mA Available in SOIC and QSOP packages
The IDTQS74FCT251T is a high-speed CMOS TTL-compatible 8-input multiplexer with 3-state outputs. All inputs have clamp diodes for undershoot noise suppression. All outputs have ground bounce suppression. Outputs will not load an active bus when Vcc is removed from the device.
FUNCTIONAL BLOCK DIAGRAM
E S2 S1 S0 I0 I1 I2 I3 I4 I5 I6 I7
Y
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
Y
INDUSTRIAL TEMPERATURE RANGE
1
FEBRUARY 2001
DSC-5235/1
(c) 2001 Integrated Device Technology, Inc.
IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM TSTG Description Terminal Voltage with Respect to GND Storage Temperature DC Output Current Max Current Sink/Pin Input Diode Current, VIN < 0 DC Output Current, VOUT < 0 Max -0.5 to +7 -65 to +150 +120 -20 -50 Unit V C mA mA mA
I3 I2 I1 I0 Y Y E GND
1 2 3 4 5 6 7 8
SOIC/ QSOP TOP VIEW
16 15 14 13 12 11 10 9
VCC I4 I5 I6 I7 S0 S1 S2
IOUT IIK IOK
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.
CAPACITANCE (TA = +25C, F = 1.0MHz)
Symbol CIN COUT Parameter(1) Input Capacitance Output Capacitance Conditions VIN = 0V VOUT = 0V Typ. 4 8 Max. -- -- Unit pF pF
NOTE: 1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Names Ix Sx E Y, Y I/O I I I 0 Data In Select Enable Data Out Description
FUNCTION TABLE(1)
Select E H L L L L L L L L S0 X L L L L H H H H S1 X L L H H L L H H S2 X L H L H L H L H Outputs Y Z I0 I1 I2 I3 I4 I5 I6 I7 Y Z I0 I1 I2 I3 I4 I5 I6 I7 Function Disable S2-0 = 0 S2-0 = 1 S2-0 = 2 S2-0 = 3 S2-0 = 4 S2-0 = 5 S2-0 = 6 S2-0 = 7
NOTE: 1. H = HIGH Voltage Level X = Don't Care L = LOW Voltage Level Z = High-Impedance
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IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified: Industrial: TA = -40C to +85C, VCC = 5.0V 5%
Symbol VIH VIL VT IIH IIL IOZ IOS VIC VOH VOL Parameter Input HIGH Level Input LOW Level Input Hysteresis Input HIGH Current Input LOW Current Off-State Output Current (Hi-Z) Short Circuit Current Input Clamp Voltage Output HIGH Voltage Output LOW Voltage VCC = Max. VCC = Max., VOUT = VCC = Min. VCC = Min. GND(2) IOH = -15mA IOL = 12mA VCC = Min., IIN = -18mA, TA = 25C 0 VIN VCC -- -60 -- 2.4 -- -- -- -0.7 -- -- 5 -- -1.2 -- 0.5 A mA V V V Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VTLH - VTHL for all inputs VCC = Max. 0 VIN VCC Min. 2 -- -- -- Typ.(2) -- -- 0.2 -- Max. -- 0.8 -- 5 Unit V V V A
NOTES: 1. Typical values are at VCC = 5.0V, +25C ambient. 2. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
POWER SUPPLY CHARACTERISTICS
Symbol ICC Parameter Quiescent Power Supply Current Test Conditions(1) VCC = Max. freq = 0 0V VIN 0.2V or VCC - 0.2V VIN VCC ICC Supply Current per Input TTL Inputs HIGH VCC = Max. VIN = 3.4V(2) freq = 0 VCC = Max. Outputs Open and Enabled One Bit Toggling 50% Duty Cycle Other inputs at GND or VCC(3,4)
NOTES: 1. For conditions shown as Min. or Max., use appropriate value specified under DC Electrical Characteristics. 2. Per TTL driven input (VIN = 3.4V). 3. For flip-flops, ICCD is measured by switching one of the data input pins so that the output changes every clock cycle. This is a measurement of device power consumption only and does not include power to drive load capacitance or tester capacitance. 4. IC = IQUIESCENT + IINPUTS + IDYNAMIC IC = ICC + ICC DHNT + ICCD (fCP/2 + fiNi) ICC = Quiescent Current ICC = Power Supply Current for a TTL High Input (VIN = 3.4V) DH = Duty Cycle for TTL Inputs High NT = Number of TTL Inputs at DH ICCD = Dynamic Current caused by an Output Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fi = Output Frequency Ni = Number of Outputs at fi All currents are in milliamps and all frequencies are in megahertz.
Min. --
Max. 1.5
Unit mA
--
2
mA
ICCD
Supply Current per Input per MHz
--
0.25
mA/ MHz
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IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
SWITCHING CHARACTERISTICS OVER OPERATING RANGE(1)
Symbol tIY Parameter Propagation Delay Ix to Y or Y tSY tPZH tPZL tPHZ tPLZ Propagation Delay Sx to Y or Y Output Enable Time E to Yx or Y Output Disable Time E to Yx or Y 1.5 6
ns
Min. 1.5
Max. 5.2
Unit ns
1.5 1.5
6.6 6
ns
ns
NOTES: 1. CLOAD = 50pF, RLOAD = 500 unless otherwise noted. 2. Minimums guaranteed but not tested. 3. This parameter is guaranteed by design but not tested.
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IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
VCC 500 Pulse Generator VIN D.U.T. 50pF RT CL 500 VOUT 7.0V
SWITCH POSITION
Test Open Drain Disable Low Enable Low All Other Tests Switch Closed Open
DEFINITIONS: CL = Load capacitance: includes jig and probe capacitance. RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
FCTL link
Test Circuits for All Outputs
DATA INPUT TIMING INPUT ASYNCHRONOUS CONTROL PRESET CLEAR ETC. SYNCHRONOUS CONTROL PRESET CLEAR CLOCK ENABLE ETC.
tSU
tH
tREM
3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V
FCTL link
LOW-HIGH-LOW PULSE tW HIGH-LOW-HIGH PULSE
FCTL link
1.5V
1.5V
tSU
tH
Pulse Width
Set-Up, Hold, and Release Times
ENABLE SAME PHASE INPUT TRANSITION tPLH OUTPUT tPLH OPPOSITE PHASE INPUT TRANSITION tPHL tPHL 3V 1.5V 0V VOH 1.5V VOL 3V 1.5V 0V
FCTL link
DISABLE 3V 1.5V
CONTROL INPUT tPZL OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH CLOSED tPZH SWITCH OPEN 3.5V 1.5V tPHZ 0.3V 1.5V 0V tPLZ
0V 3.5V 0.3V VOL VOH 0V
FCTL link
Propagation Delay
Enable and Disable Times
NOTES: 1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH. 2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns.
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IDTQS74FCT251AT HIGH-SPEED CMOS 8-INPUT MULTIPLEXER
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
FCT IDTQS XX Temp. Range XX XXXX Device Type Package
SO Q
Small Outline IC (gull wing) Quarter Size Small Outline Package
251AT
High-Speed CMOS 8-Input Multiplexer
74
-40C to +85C
CORPORATE HEADQUARTERS 2975 Stender Way Santa Clara, CA 95054
for SALES: 800-345-7015 or 408-727-6116 fax: 408-492-8674 www.idt.com
for Tech Support: logichelp@idt.com (408) 654-6459
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