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| DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer April 1984 Revised April 2000 DM74ALS251 3-STATE 1-of-8 Line Data Selector/Multiplexer General Description 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. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Switching performance is guaranteed over full temperature and VCC supply range s Pin and functional compatible with LS family counterpart s Improved output transient handling capability s Output control circuitry incorporates power-up 3-STATE feature Ordering Code: Order Number DM74ALS251M DM74ALS251SJ DM74ALS251N Package Number M16A M16D N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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 C X L L L L H H H H B X L L H H L L H H A X L H L H L H L H Strobe S H L L L L L L L L Y Z D0 D1 D2 D3 D4 D5 D6 D7 W Z D0 D1 D2 D3 D4 D5 D6 D7 Outputs H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance (OFF) D0 thru D7 = The Level of the Respective D Input (c) 2000 Fairchild Semiconductor Corporation DS006214 www.fairchildsemi.com DM74ALS251 Logic Diagram www.fairchildsemi.com 2 DM74ALS251 Absolute Maximum Ratings(Note 1) Supply Voltage, VCC Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 78.0C/W 107.0C/W 7V 7V 5.5V 0C to +70C -65C to +150C 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. Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.5 2 0.8 -2.6 24 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH VOL II IIH IIL IO IOZH IOZL ICC HIGH Level Output Voltage LOW Level Output Voltage Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current OFF-State Output Current, HIGH Bias OFF-State Output Current, LOW Bias Supply Current Parameter Input Clamp Voltage Conditions VCC = 4.5V, IIN = -18 mA VCC = 4.5V, IOH = Max IOH = -400 A, VCC = 4.5V to 5.5V VCC = 4.5V VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIN = 0.4V VCC = 5.5V, VOUT = 2.25V VCC = 5.5V, VOUT = 2.7V VCC = 5.5V, VOUT = 0.4V VCC = 5.5V, Inputs = GND Inputs = 4.5V, VCC = 5.5V Enabled Disabled 7 9.4 -30 IOL = 24 mA 2.4 VCC-2 0.35 0.5 0.1 20 -0.1 -112 20 -20 10 14 3.2 Min Typ Max -1.5 Units V V V V mA A mA mA A A mA 3 www.fairchildsemi.com DM74ALS251 Switching Characteristics over recommended operating free air temperature range Symbol Parameter Conditions tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPZH tPZL tPZH tPZL tPHZ tPLZ tPHZ tPLZ Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Enable Time to HIGH Level Output Enable Time to LOW Level Output Disable Time from HIGH Level Output Disable Time from LOW Level Output Disable Time from HIGH Level Output Disable Time from LOW Level VCC = 4.5V to 5.5V CL = 50 pF RL = 500 From Select Y Select Select W Select Data Y Data Data W Data Output Control Y Output Control Output Control W Output Control Output Control Y Output Control Output Control W Output Control 1 10 ns 1 2 10 10 ns ns 3 2 15 10 ns ns 3 3 15 15 ns ns 3 3 15 15 ns ns 3 3 15 15 ns ns 7 2 23 10 ns ns 8 8 24 24 ns ns To Min 5 Max 18 Units ns www.fairchildsemi.com 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: 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. 7 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. www.fairchildsemi.com www.fairchildsemi.com |
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