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PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T
Fast CMOS Quad 2-Input Multiplexer
PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T QUAD 2-INPUT MULTIPLEXER
Product Features:
* PI74FCT157/257/2157/2257T is pin compatible with bipolar FASTTM Series at a higher speed and lower power consumption * 25 series resistor on all outputs (FCT2XXX only) * TTL input and output levels * Low ground bounce outputs (25 series only) * Extremely low static power * Hysteresis on all inputs * Industrial operating temperature range: -40C to +85C * Packages available: - 16-pin 150 mil wide plastic QSOP (Q) - 16-pin 300 mil wide plastic SOIC (S) - 16-pin 150 mil wide plastic SOIC (W)
Product Description:
Pericom Semiconductor's PI74FCT series of logic circuits are produced in the Company's advanced 0.8 micron CMOS technology, achieving industry leading speed grades. All PI74FCT2XXX devices have a built-in 25-ohm series resistor on all outputs to reduce noise because of reflections, thus eliminating the need for an external terminating resistor. The PI74FCT157T/257T and PI74FCT2157T/2257T are highspeed quad 2-input multiplexers. The common select input can be used to select four bits of data from two sources. The four buffered outputs present the selected data in the true (non-inverting) form. The PI74FCT157T/2157T has a common, active-LOW, Enable input (E). When E is inactive, all four outputs are held LOW. The PI74FCT157T/2157T can generate any four of the 16 different funtions of two variables with one common variable. The PI74FCT157T/2157T can be used as a function generator or to move data from two different groups of registers to a common bus. The PI74FCT257/2257T has a common Output Enable (OE) input. When OE is HIGH, all outputs are switched to a high-impedance state allowing the outputs to interface directly with bus-oriented systems.
Logic Block Diagram
S
157 ONLY
E
3 OTHER MULTIPLEXERS
I1B-I1D ZB-ZD I0B-I0D
I1A ZA I0A
257 ONLY
OE
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PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T QUAD 2-INPUT MULTIPLEXER
Product Pin Description
Pin Name I0A-I0D I1A-I1D E OE S ZA-ZD GND VCC Description Source 0 Data Inputs Source 1 Data Inputs Enable Input (Active LOW) FCT157/2157 Output Enable (Active LOW) FCT257/2257 Select Input Outputs Ground Power
Truth Table(1)
Inputs E/OE H L L L L S X H H L L I0 X X X L H I1 X L H X X Outputs ZN 157/2157 257/2257 L Z L L H H L L H H
NOTE: 1. H = High Voltage Level X = Don't Care L = Low Voltage Level Z = High Impedance
PI74FCT157/2157T Product Pin Configuration
S I0A I1A ZA I0B I1B ZB GND
1 16 2 15 3 16-PIN 14 Q16 13 4 S16 12 5 W16 11 6 7 10 8 9
Vcc E I0C I1C ZC I0D I1D ZD
PI74FCT257/2257T Product Pin Configuration
S I0A I1A ZA I0B I1B ZB GND
1 2 3 4 5 6 7 8 16 15 16-PIN 14 Q16 13 S16 12 W16 11 10 9
Vcc OE I0C I1C ZC I0D I1D ZD
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PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T QUAD 2-INPUT MULTIPLEXER
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................................................. -65C to +150C Ambient Temperature with Power Applied ................................. -40C to +85C Supply Voltage to Ground Potential (Inputs & Vcc Only) .......... -0.5V to +7.0V Supply Voltage to Ground Potential (Outputs & D/O Only) ....... -0.5V to +7.0V DC Input Voltage ......................................................................... -0.5V to +7.0V DC Output Current ................................................................................... 120 mA Power Dissipation ......................................................................................... 0.5W Note: Stresses greater than those listed under 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.
DC Electrical Characteristics (Over the Operating Range, TA = -40C to +85C, VCC = 5.0V 5%)
Parameters Description VOH VOL VOL VIH VIL IIH IIL IOZH IOZL VIK IOFF IOS VH Output HIGH Voltage Output LOW Current Output LOW Current Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current High Impedance Output Current Clamp Diode Voltage Power Down Disable Short Circuit Current Input Hysteresis VCC = Min., IIN = -18 mA VCC = GND, VOUT = 4.5V VCC = Max.(3), VOUT = GND -- -60 Test Conditions(1) VCC = Min., VIN = VIH or VIL VCC = Min., VIN = VIH or VIL VCC = Min., VIN = VIH or VIL Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Max. VCC = Max. VCC = MAX. VIN = VCC VIN = GND VOUT = 2.7V VOUT = 0.5V -0.7 -- -120 200 IOH = -15.0 mA IOL = 48 mA IOL = 12 mA (25 Series) 2.0 0.8 1 -1 1 -1 -1.2 100 Min. Typ(2) Max. Units 2.4 3.0 0.3 0.3 0.50 0.50 V V V V V A A A A V A mA m V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) CIN COUT Description Input Capacitance Output Capacitance Test Conditions VIN = 0V VOUT = 0V Typ 6 8 Max. 10 12 Units pF pF
Notes: 1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type. 2. Typical values are at Vcc = 5.0V, +25C ambient and maximum loading. 3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second. 4. This parameter is determined by device characterization but is not production tested.
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PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T QUAD 2-INPUT MULTIPLEXER
Power Supply Characteristics
Parameters Description ICC ICC ICCD Quiescent Power Supply Current Supply Current per Input @ TTL HIGH Supply Current per Input per MHz(4) Test Conditions(1) VCC = Max. VCC = Max. VCC = Max., Outputs Open E or OE = GND One Bit Toggling 50% Duty Cycle VCC = Max., Outputs Open fI = 10 MHZ 50% Duty Cycle E or OE = GND One Bit Toggling VCC = Max., Outputs Open fI = 2.5 MHZ 50% Duty Cycle E or OE = GND Four Bits Toggling VIN = GND or VCC VIN = 3.4V(3) VIN = VCC VIN = GND Min. Typ(2) 0.1 0.5 0.15 Max. 500 2.5 0.25 Units A mA mA/ MHz
IC
Total Power Supply Current(6)
VIN = VCC VIN = GND VIN = 3.4V VIN = GND VIN = VCC VIN = GND VIN = 3.4V VIN = GND
1.5
3.5(5)
mA
1.8
4.5(5)
1.5
3.5(5) 7.5(5)
2.5
Notes: 1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device. 2. Typical values are at Vcc = 5.0V, +25C ambient. 3. Per TTL driven input (VIN = 3.4V); all other inputs at Vcc or GND. 4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations. 5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested. 6. 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 Input Transition Pair (HLH or LHL) fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices) fI = Input Frequency NI = Number of Inputs at fI All currents are in milliamps and all frequencies are in megahertz.
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PI74FCT157T/257T (25 Series)PI74FCT2157T/2257T QUAD 2-INPUT MULTIPLEXER
PI74FCT157/2157T Switching Characteristics over Operating Range
157T/2157T Com. Min Max 1.5 1.5 1.5 6.0 10.5 10.5 157AT/2157AT 157CT/2157CT Com. Com. Min Max Min Max 1.5 1.5 1.5 5.0 6.0 7.0 1.5 1.5 1.5 4.3 4.8 5.2 157DT Com. Min Max Unit 1.5 1.5 1.5 3.9 4.4 4.6 ns ns ns
Parameters tPLH tPHL tPLH tPHL tPLH tPHL
Description Propagation Delay IN to ZN Propagation Delay E to ZN Propagation Delay S to ZN
Conditions(1) CL = 50 pF RL = 500
PI74FCT257/2257T Switching Characteristics over Operating Range
257T/2257T Com. Min Max 1.5 1.5 1.5 1.5 6.0 10.5 8.5 6.0 257AT/2257AT 257CT/2257CT Com. Com. Min Max Min Max 1.5 1.5 1.5 1.5 5.0 7.0 7.0 5.5 1.5 1.5 1.5 1.5 4.3 5.2 6.0 5.0
Parameters tPLH tPHL tPLH tPHL tPZH tPZL tPZH tPZL
Description Propagation Delay IN to ZN Propagation Delay S to ZN Output Enable Time OE to ZN Output Disable Time(3) OE to ZN
Conditions(1) CL = 50 pF RL = 500
Unit ns ns ns ns
Notes: 1. See test circuit and wave forms. 2. Minimum limits are guaranteed but not tested on Propagation Delays. 3. This parameter guaranteed but not production tested.
Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com
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PS2010A 03/09/96

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