Revised March 2000 DM74AS157 • DM74AS158 Quad 1 of 2 Line Data Selector/Multiplexer General Description Features These data selectors/multiplexers contain inverters and drivers to supply full on-chip data selection to the four output gates. A separate STROBE input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The AS157 presents true data whereas the AS158 presents inverted data to minimize propagation delay time. ■ Switching specifications at 50 pF ■ Switching specifications guaranteed over full temperature and VCC range ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart ■ Improved AC performance over Schottky, low power Schottky, and advanced low power Schottky counterparts ■ Expand any data input point ■ Multiplex dual data buses ■ General four functions of two variables (one variable is common) ■ Source programmable counters Ordering Code: Order Number Package Number Package Description DM74AS157M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74AS157SJX M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74AS157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74AS158M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74AS158N 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. Connection Diagram Function Table Inputs STROBE Select Output Y A B H X X X DM74AS157 DM74AS158 L H L L L X L H L L H X H L L H X L L H L H X H H L H = HIGH Level L = LOW Level X = Don't Care © 2000 Fairchild Semiconductor Corporation DS006290 www.fairchildsemi.com DM74AS157 • DM74AS158 Quad 1 of 2 Line Data Selector/Multiplexer April 1984 DM74AS157 • DM74AS158 Logic Diagrams DM74AS157 DM74AS158 www.fairchildsemi.com 2 Supply Voltage 7V Input Voltage 7V Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Typical θJA 75.0 °C/W N Package Recommended Operating Conditions Symbol Parameter Min Nom Max 4.5 5 5.5 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −2 mA IOL LOW Level Output Current 20 mA TA Free Air Operating Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA VOH HIGH Level VCC = 4.5V to 5.5V Output Voltage IOH = −2 mA VOL II IIH IIL LOW Level VCC = 4.5V Output Voltage IOL = 20 mA Min Typ Max Units −1.2 V VCC − 2 V 0.35 0.5 Input Current at Max VCC = 5.5V Select 0.2 Input Voltage VIH = 7V All Others 0.1 HIGH Level VCC = 5.5V Select 40 Input Current VIH = 2.7V All Others 20 LOW Level VCC = 5.5V Select Input Current VIL = 0.4V All Others IO (Note 2) Output Drive Current VCC = 5.5V, VO = 2.25V ICC Supply Current VCC = 5.5V −1 −0.5 −30 −112 V mA µA mA mA DM74AS157 17.5 28 mA DM74AS158 15.6 22.5 mA Note 2: The output conditions have been chosen to produce a current that closely approximates one half of the true short circuit current, IOS. 3 www.fairchildsemi.com DM74AS157 • DM74AS158 Absolute Maximum Ratings(Note 1) DM74AS157 • DM74AS158 DM74AS157 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL Parameter Conditions Propagation Delay Time, VCC = 4.5V to 5.5V, LOW-to-HIGH Level Output CL = 50 pF, Propagation Delay Time, RL = 500Ω HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output From To (Input) (Output) Data Min Max Units Y 1 6 ns Data Y 1 5.5 ns STROBE Y 2 10.5 ns STROBE Y 2 7.5 ns Select Y 2 11 ns Select Y 2 10 ns Min Max Units DM74AS158 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL Parameter Conditions Propagation Delay Time, VCC = 4.5V to 5.5V, LOW-to-HIGH Level Output CL = 50 pF, Propagation Delay Time, RL = 500Ω HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output tPLH Propagation Delay Time, LOW-to-HIGH Level Output tPHL Propagation Delay Time, HIGH-to-LOW Level Output www.fairchildsemi.com 4 From To (Input) (Output) Data Y 1 5 ns Data Y 1 4.5 ns STROBE Y 2 6.5 ns STROBE Y 2 10 ns Select Y 2 9.5 ns Select Y 2 10.5 ns DM74AS157 • DM74AS158 Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A 5 www.fairchildsemi.com DM74AS157 • DM74AS158 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D www.fairchildsemi.com 6 DM74AS157 • DM74AS158 Quad 1 of 2 Line Data Selector/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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