Revised April 2000 DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer General Description Features This Data Selector/Multiplexer contains full on-chip decoding to select one-of-eight data sources as a result of a unique three-bit binary code at the Select inputs. Two complementary outputs provide both inverting and non-inverting buffer operation. An Output Control input is provided which, when at the high level, places both outputs in the high impedance OFF-State. In order to prevent bus access conflicts, output disable times are shorter than output enable times. The Select input buffers incorporate internal overlap features to ensure that select input changes do not cause invalid output transients. ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Switching performance is guaranteed over full temperature and VCC supply range ■ Pin and functional compatible with LS family counterpart ■ Improved output transient handling capability ■ Output control circuitry incorporates power-up 3-STATE feature Ordering Code: Order Number Package Number Package Description DM74ALS251M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74ALS251SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74ALS251N 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 Select Outputs Strobe C B A S Y X X X H Z W Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) D0 thru D7 = The Level of the Respective D Input © 2000 Fairchild Semiconductor Corporation DS006214 www.fairchildsemi.com DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer April 1984 DM74ALS251 Logic Diagram www.fairchildsemi.com 2 Supply Voltage, VCC 7V Input Voltage 7V Voltage Applied to Disabled Output 5.5V 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 N Package 78.0°C/W M Package 107.0°C/W Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.5 5 5.5 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −2.6 mA IOL LOW Level Output Current 24 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, IIN = −18 mA VOH HIGH Level VCC = 4.5V, IOH = Max Output Voltage IOH = −400 µA, VCC = 4.5V to 5.5V VOL LOW Level II Input Current at Maximum IIH HIGH Level Input Current IIL LOW Level Input Current VCC = 5.5V, VIN = 0.4V IO Output Drive Current VCC = 5.5V, VOUT = 2.25V IOZH OFF-State Output Output Voltage Input Voltage Current, HIGH Bias IOZL OFF-State Output Current, LOW Bias ICC Supply Current Min Max −1.5 2.4 VCC = 4.5V Typ 3.2 V V VCC−2 IOL = 24 mA Units V 0.35 0.5 V VCC = 5.5V, VIH = 7V 0.1 mA VCC = 5.5V, VIH = 2.7V 20 µA −0.1 mA −112 mA VCC = 5.5V, VOUT = 2.7V 20 µA VCC = 5.5V, VOUT = 0.4V −20 µA −30 VCC = 5.5V, Inputs = GND Enabled 7 10 Inputs = 4.5V, VCC = 5.5V Disabled 9.4 14 3 mA www.fairchildsemi.com DM74ALS251 Absolute Maximum Ratings(Note 1) DM74ALS251 Switching Characteristics over recommended operating free air temperature range Symbol Parameter Conditions tPLH tPHL Propagation Delay Time From VCC = 4.5V to 5.5V LOW-to-HIGH Level Output CL = 50 pF Propagation Delay Time RL = 500Ω Select Select Propagation Delay Time Select LOW-to-HIGH Level Output tPHL Propagation Delay Time Select Propagation Delay Time Data LOW-to-HIGH Level Output tPHL Propagation Delay Time Data Propagation Delay Time Data LOW-to-HIGH Level Output tPHL Propagation Delay Time Data Output Enable Time Output Control to HIGH Level tPZL Output Enable Time Output Control Output Enable Time Output Control to HIGH Level tPZL Output Enable Time Output Control Output Disable Time Output Control from HIGH Level tPLZ Output Disable Time Output Control Output Disable Time Output Control from HIGH Level tPLZ 24 ns 8 24 ns 7 23 ns 2 10 ns 3 15 ns 3 15 ns 3 15 ns 3 15 ns 3 15 ns 3 15 ns 3 15 ns 2 10 ns 1 10 ns 2 10 ns 1 10 ns W Output Disable Time Output Control from LOW Level www.fairchildsemi.com 8 Y from LOW Level tPHZ ns W to LOW Level tPHZ 18 Y to LOW Level tPZH 5 W HIGH-to-LOW Level Output tPZH Units Y HIGH-to-LOW Level Output tPLH Max W HIGH-to-LOW Level Output tPLH Min Y HIGH-to-LOW Level Output tPLH To 4 DM74ALS251 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 DM74ALS251 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 DM74ALS251 3-STATE 1-of-8 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. LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 7 www.fairchildsemi.com