54AC157 • 54ACT157 Quad 2-Input Multiplexer General Description Features The ’AC/’ACT157 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 (noninverted) form. The ’AC/ ’ACT157 can also be used as a function generator. n n n n ICC and IOZ reduced by 50% Outputs source/sink 24 mA ’ACT157 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) — ’AC157: 5962-89539 — ’ACT157: 5962-89688 Logic Symbols IEEE/IEC DS100272-1 DS100272-2 Pin Names Description I0a–I0d Source 0 Data Inputs I1a–I1d Source 1 Data Inputs E Enable Input S Select Input Za–Zd Outputs Connection Diagrams Pin Assignment for DIP and Flatpak DS100272-3 Pin Assignment for LCC DS100272-4 FACT™ is a trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100272 www.national.com 54AC157 • 54ACT157 Quad 2-Input Multiplexer July 1998 Functional Description of the sixteen different functions of two variables with one variable common. This is useful for implementing gating functions. The ’AC/’ACT157 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 ’AC/’ACT157 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: Za = E • (I1a • S + I0a • S) Zb = E • (I1b • S + I0b • S) Zc = E • (I1c • S + I0c • S) Zd = E • (I1d • S + I0d • S) Truth Table Inputs A common use of the ’AC/ACT157 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 ’AC/’ACT157 can generate any four Outputs E S I0 I1 H X X X L L H X L L L H X H H L L L X L L L H X H Z H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Logic Diagram DS100272-5 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. www.national.com 2 Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = −0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = −0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP Supply Voltage (VCC) ’AC ’ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54AC/ACT Minimum Input Edge Rate (∆V/∆t) ’AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (∆V/∆t) ’ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V −0.5V to +7.0V −20 mA +20 mA −0.5V to VCC + 0.5V −20 mA +20 mA −0.5V to VCC + 0.5V ± 50 mA ± 50 mA −65˚C to +150˚C 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 125 mV/ns 125 mV/ns Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation of FACT™ circuits outside databook specifications. 175˚C DC Characteristics for ’AC Family Devices Symbol Parameter VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH VOL IIN Minimum High Level 3.0 2.1 Input Voltage 4.5 3.15 5.5 3.85 Maximum Low Level 3.0 0.9 Input Voltage 4.5 1.35 5.5 1.65 Minimum High Level 3.0 2.9 Output Voltage 4.5 4.4 5.5 5.4 3.0 2.4 4.5 3.7 5.5 4.7 Maximum Low Level 3.0 0.1 Output Voltage 4.5 0.1 5.5 0.1 Maximum Input 3.0 0.50 4.5 0.50 5.5 0.50 5.5 ± 1.0 VOUT = 0.1V V or VCC − 0.1V V or VCC − 0.1V VOUT = 0.1V IOUT = −50 µA V V (Note 2) VIN = VIL or VIH IOH = −12 mA IOH = −24 mA IOH = −24 mA IOUT = 50 µA V (Note 2) VIN = VIL or VIH IOL = 12 mA V IOL = 24 mA µA IOL = 24 mA VI = VCC, GND Leakage Current IOLD IOHD Minimum Dynamic Output Current (Note 3) 5.5 50 mA 5.5 −50 mA 3 VOLD = 1.65V Max VOHD = 3.85V Min www.national.com DC Characteristics for ’AC Family Devices Symbol Parameter (Continued) VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits ICC Maximum Quiescent 5.5 80.0 µA Supply Current VIN = VCC or GND Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C. DC Characteristics for ’ACT Family Devices Symbol Parameter VCC 54ACT TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH VOL IIN Minimum High Level 4.5 2.0 Input Voltage 5.5 2.0 Maximum Low Level 4.5 0.8 Input Voltage 5.5 0.8 Minimum High Level 4.5 4.4 Output Voltage 5.5 5.4 4.5 3.70 5.5 4.70 Maximum Low Level 4.5 0.1 Output Voltage 5.5 0.1 Maximum Input V VOUT = 0.1V V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA V (Note 5) VIN = VIL or VIH IOH = −24 mA IOH = −24 mA V IOUT = 50 µA V (Note 5) VIN = VIL or VIH IOL = 24 mA 4.5 0.50 5.5 0.50 5.5 ± 1.0 µA IOL = 24 mA VI = VCC, GND 5.5 1.6 mA VI = VCC − 2.1V VOLD = 1.65V Max VOHD = 3.85V Min VIN = VCC Leakage Current ICCT Maximum ICC/Input IOLD Minimum Dynamic 5.5 50 mA IOHD Output Current (Note 6) 5.5 −50 mA ICC Maximum Quiescent 5.5 80.0 µA Supply Current or GND Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time. Note 7: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C. www.national.com 4 AC Electrical Characteristics 54AC TA = −55˚C VCC Symbol Parameter (V) to +125˚C CL = 50 pF (Note 8) tPLH tPHL tPLH tPHL tPLH tPHL Units Min Max Propagation Delay 3.3 1.0 16.0 S to Zn 5.0 1.0 12.0 Propagation Delay 3.3 1.0 14.0 S to Zn 5.0 1.0 11.5 Propagation Delay 3.3 1.0 16.0 E to Zn 5.0 1.0 12.0 Propagation Delay 3.3 1.0 14.0 E to Zn 5.0 1.0 11.5 Propagation Delay 3.3 1.0 11.0 In to Zn 5.0 1.0 9.0 Propagation Delay 3.3 1.0 11.0 In to Zn 5.0 1.0 9.0 ns ns ns ns ns ns Note 8: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V AC Electrical Characteristics 54ACT TA = −55˚C VCC Symbol Parameter (V) to +125˚C CL = 50 pF (Note 9) tPLH Propagation Delay Units Min Max 5.0 1.0 11.5 ns 5.0 1.0 11.5 ns 5.0 1.0 12.0 ns 5.0 1.0 10.0 ns 5.0 1.0 8.5 ns 5.0 1.0 9.0 ns S to Zn tPHL Propagation Delay S to Zn tPLH Propagation Delay E to Zn tPHL Propagation Delay E to Zn tPLH Propagation Delay In to Zn tPHL Propagation Delay In to Zn Note 9: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Symbol CIN CPD Typ Units Input Capacitance Parameter 4.5 pF Power Dissipation 50.0 pF Conditions VCC = OPEN VCC = 5.0V Capacitance 5 www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted 20 Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 16-Lead Ceramic Dual-In-Line Package (D) NS Package Number J16A 7 www.national.com 54AC157 • 54ACT157 Quad 2-Input Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Ceramic Flatpak (F) NS Package Number W16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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