Revised September 2000 74F157A Quad 2-Input Multiplexer General Description The F157A is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four outputs present the selected data in the true (non-inverted) form. The F157A can also be used to generate any four of the 16 different functions to two variables. Ordering Code: Order Number Package Number Package Description 74F157ASC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 74F157ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74F157APC N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbols Connection Diagram IEEE/IEC © 2000 Fairchild Semiconductor Corporation DS009483 www.fairchildsemi.com 74F157A Quad 2-Input Multiplexer April 1988 74F157A Unit Loading/Fan Out Pin Names Description HIGH/LOW I0a–I0d Source 0 Data Inputs 1.0/1.0 20 µA/−0.6 mA I1a–I1d Source 1 Data Inputs 1.0/1.0 20 µA/−0.6 mA E Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA S Select Input 1.0/1.0 20 µA/−0.6 mA Za–Zd Outputs 50/33.3 −1 mA/20 mA Functional Description Inputs S I0 I1 Z L X X X L H X L L L H X H H L L L X L L The F157A is a quad 2-input multiplexer. It selects four bits of data from two sources under the control of a common Select input (S). The Enable input (E) is active LOW. When E is HIGH, all of the outputs (Z) are forced LOW regardless of all other inputs. The F157A is the logic implementation of a 4-pole, 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input. The logic equations for the outputs are shown below: Output H L Input IIH/IIL Output IOH/IOL Truth Table E U.L. H X Zn = E • (I1nS + I0n S) A common use of the F157A is the moving of data from two groups of registers to four common output busses. The particular register from which the data comes is determined by the state of the Select input. A less obvious use is as a function generator. The F157A can generate any four of the 16 different functions of two variables with one variable common. This is useful for implementing highly irregular logic. H H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.fairchildsemi.com 2 Recommended Operating Conditions Storage Temperature −65°C to +150°C Ambient Temperature under Bias −55°C to +125°C Free Air Ambient Temperature Junction Temperature under Bias −55°C to +150°C Supply Voltage 0°C to +70°C +4.5V to +5.5V −0.5V to +7.0V VCC Pin Potential to Ground Pin Input Voltage (Note 2) −0.5V to +7.0V Input Current (Note 2) −30 mA to +5.0 mA Voltage Applied to Output in HIGH State (with VCC = 0V) Standard Output −0.5V to VCC 3-STATE Output −0.5V to +5.5V Note 1: Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired. Functional operation under these conditions is not implied. Current Applied to Output in LOW State (Max) Note 2: Either voltage limit or current limit is sufficient to protect inputs. twice the rated IOL (mA) ESD Last Passing Voltage (Min) 4000V DC Electrical Characteristics Symbol Parameter Min Typ Max VCC Units Input HIGH Voltage VIL Input LOW Voltage 0.8 V VCD Input Clamp Diode Voltage −1.2 V Min V Min 0.5 V Min IOL = 20 mA 5.0 µA Max VIN = 2.7V 7.0 µA Max VIN = 7.0V 50 µA Max VOUT = VCC V 0.0 3.75 µA 0.0 −0.6 mA Max −150 mA Max VOUT = 0V VOH Output HIGH Voltage VOL Output LOW Voltage IIH Input HIGH 2.0 10% VCC 2.5 5% VCC 2.7 V Conditions VIH 10% VCC Current IBVI Input HIGH Current Breakdown Test ICEX Output HIGH Leakage Current VID Input Leakage 4.75 Test IOD Output Leakage Circuit Current Recognized as a HIGH Signal Recognized as a LOW Signal IIN = −18 mA IOH = −1 mA IOH = −1 mA IID = 1.9 µA All Other Pins Grounded VIOD = 150 mV All Other Pins Grounded VIN = 0.5V IIL Input LOW Current IOS Output Short-Circuit Current ICCH Power Supply Current 15 23 mA Max VO = HIGH ICCL Power Supply Current 15 23 mA Max VO = LOW −60 AC Electrical Characteristics Symbol Parameter TA = +25°C TA = −55°C to +125°C TA = 0°C to +70°C VCC = +5.0V VCC = +5.0V VCC = +5.0V CL = 50 pF CL = 50 pF CL = 50 pF Min Typ Max Min Max Min Max tPLH Propagation Delay 4.0 7.0 10.0 4.0 12.0 4.0 11.0 tPHL S to Zn 3.0 5.0 7.0 3.0 9.0 3.0 8.0 tPLH Propagation Delay 5.0 7.0 9.5 5.0 13.0 5.0 11.0 tPHL E to Zn 2.5 4.5 6.5 2.5 7.5 2.5 7.0 tPLH Propagation Delay 2.5 4.5 6.0 2.5 7.5 2.5 6.5 tPHL In to Zn 2.5 4.0 5.5 1.5 7.5 2.0 7.0 3 Units ns ns ns www.fairchildsemi.com 74F157A Absolute Maximum Ratings(Note 1) 74F157A Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A www.fairchildsemi.com 4 74F157A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D 5 www.fairchildsemi.com 74F157A Quad 2-Input Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 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