74LS251 SYC | Alldatasheet

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Technical content

Features

■ 3-STATE version of DM74LS151 ■ Interface directly with system bus ■ Perform parallel-to-serial conversion ■ Permit multiplexing from N-lines to one line ■ Complementary outputs provide true and inverted data ■ Maximum number of common outputs: 129 ■ Typical propagation delay time (D to Y): 17 ns ■ Typical power dissipation: 35 mW Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table H = HIGH Logic Level L = LOW Logic Level X = Don't Care Z = High Impedance (OFF) D0, D1…D7 = The level of the respective D input Order Number Package Number Package Description DM74LS251M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74LS251N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Inputs Outputs Select Strobe YWCBA S XXX H Z Z LLL L D 0 D 0 LLH L D 1 D 1 LHL L D 2D 2 LHH L D 3D 3 HLL L D 4D 4 HLH L D 5D 5 HHL L D 6D 6 HHH L D 7D 7 www.sycelectronica.com.ar

Absolute Maximum Ratings(Note 1) 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” table are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note 4: ICC1 is measured with the outputs open, STROBE grounded, and all other inputs at 4.5V. Note 5: ICC2 is measured with the outputs open and all inputs at 4.5V. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units V CC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V 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 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V VOH HIGH Level V CC = Min, IOH = Max 2.4 3.1 V Output Voltage V IL = Max, VIH = Min VOL LOW Level V CC = Min, IOL = Max 0.35 0.5 Output Voltage V IL = Max, VIH = Min V IOL = 12 mA, VCC = Min 0.25 0.4 II Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 mA IIH HIGH Level Input Current V CC = Max, VI = 2.7V 20 µA IIL LOW Level Input Current V CC = Max, VI = 0.4V −0.4 mA IOZH Off-State Output Current with V CC = Max, VO = 2.7V 20 µA HIGH Level Output Voltage Applied VIH = Min, VIL = Max IOZL Off-State Output Current with V CC = Max, VO = 0.4V −20 µA LOW Level Output Voltage Applied VIH = Min, VIL = Max IOS Short Circuit Output Current V CC = Max (Note 3) −20 −100 mA ICC1 Supply Current V CC = Max (Note 4) 6.1 10 mA ICC2 Supply Current V CC = Max (Note 5) 7.1 12 mA www.sycelectronica.com.ar

at VCC = 5V and TA = 25°C Note 6: C L = 5 pF From (Input) R L = 667Ω Symbol Parameter to (Output) C L = 45 pF C L = 150 pF Units Min Max Min Max tPLH Propagation Delay Time A, B, C 45 53 ns LOW-to-HIGH Level Output (4 Levels) to Y tPHL Propagation Delay Time A, B, C 45 53 ns HIGH-to-LOW Level Output (4 Levels) to Y tPLH Propagation Delay Time A, B, C 33 38 ns LOW-to-HIGH Level Output (3 Levels) to W tPHL Propagation Delay Time A, B, C 33 42 ns HIGH-to-LOW Level Output (3 Levels) to W tPLH Propagation Delay Time D to Y 28 35 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time D to Y 28 38 ns HIGH-to-LOW Level Output tPLH Propagation Delay Time D to W 15 25 ns LOW-to-HIGH Level Output tPHL Propagation Delay Time D to W 15 25 ns HIGH-to-LOW Level Output tPZH Output Enable Time to Strobe to Y 45 60 ns HIGH Level Output tPZL Output Enable Time to Strobe to Y 40 51 ns LOW Level Output tPHZ Output Disable Time from Strobe to Y 45 ns HIGH Level Output (Note 6) tPLZ Output Disable Time from Strobe to Y 25 ns LOW Level Output (Note 6) tPZH Output Enable Time to Strobe to W 27 40 ns HIGH Level Output tPZL Output Enable Time to Strobe to W 40 47 ns LOW Level Output tPHZ Output Disable Time from Strobe to W 55 ns HIGH Level Output (Note 6) tPLZ Output Disable Time from Strobe to W 25 ns LOW Level Output (Note 6) www.sycelectronica.com.ar

Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow Package Number M16A www.sycelectronica.com.ar

DM74LS251 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 www.sycelectronica.com.ar