74LS138 SS | Alldatasheet
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Low Power Schottky Logic – 74LS138 Rev 1.0 21/11/17 3-to-8 Line Decoder / Demultiplexer IC in bare die form Description Features: Demultiplexing capability The 74LS138 3-to-8 Line Decoder / Demultiplexer is fabricated on a 2µm 40V Bipolar process. The device decodes 1-of-8 lines, set by x3 binary select inputs & three enable inputs. Multiple Input Enables allow parallel expansion to a 24-line decoder using x3 74LS138 devices or a 32 line decoder using x4 74LS138 + inverter. The LS138 can be used as an 8- output demultiplexer by using one active LOW Enable input as data input & the other Enable inputs as strobes. Unused Enable inputs must be permanently tied to their appropriate active HIGH or active LOW state. Multiple Input Enables for parallel expansion Active Low Mutually Exclusive Outputs Input Clamp Diodes Limit High Speed Termination Effects Direct drop-in replacement for obsolete components in long term programs. Ordering Information Die Dimensions in µm (mils) 1660 (65) The following part suffixes apply: No suffix - MIL-STD-883 /2010B Visual Inspection 1650 (65) For High Reliability versions of this product please see 54LS138 Supply Formats: Mechanical Specification Default – Die in Waffle Pack (100 per tray capacity) Sawn Wafer on Tape – On request Unsawn Wafer – On request Die Thickness <> 350µm(14 Mils) – On request Assembled into Plastic Package – On request 1660 x 1650 µm Die Size (Unsawn) 65 x 65 mils 116 x 116 µm Minimum Bond Pad Size 4.57 x 4.57 mils 350 (±20) µm Die Thickness 13.78 (±0.79) mils Top Metal Composition Al 1%Si 1.1µm Back Metal Composition N/A – Bare Si Page 1 of 4 www.siliconsupplies.com A ll data sheet.com
www.siliconsupplies.com d Low Power Schottky Logic – 74LS138 Rev 1.0 21/11/17 COORDINATES (mm) PAD FUNCTION X Y 1 A 0.173 0.875 2 B 0.197 0.169 3 C 0.361 0.171 4 G2A 0.725 0.176 5 G2A 0.929 0.184 6 G1 1.141 0.220 7 Y7 1.405 0.221 8 GND 1.425 0.461 9 Y6 1.393 0.695 10 Y5 1.398 1.054 11 Y4 1.198 1.395 12 Y3 1.022 1.395 13 Y2 0.804 1.395 14 Y1 0.524 1.395 15 Y0 0.202 1.395 16 VCC 0.135 1.099 CONNECT CHIP BACK TO GND OR FLOAT Pad Layout and Functions 1660µm (65.35 mils) 1650µm (64.96 mils) 0,0 13 12 11 4 3 2 DIE ID 76 5 14 15 Truth Table INPUTS OUTPUTS G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X X X H H H H H H H H X H X X X X H H H H H H H H L X X X X X H H H H H H H H H L L L L L L H H H H H H H H L L L L H H L H H H H H H H L L L H L H H L H H H H H H L L L H H H H H L H H H H H L L H L L H H H H L H H H H L L H L H H H H H H L H H H L L H H L H H H H H H L H H L L H H H H H H H H H H L H = High level (steady state) L = Low level (steady state) X = Don’t care A ll data sheet.com
www.siliconsupplies.com Low Power Schottky Logic – 74LS138 Rev 1.0 21/11/17 PARAMETER SYMBOL MIN MAX UNITS Supply Voltage VCC 4.75 5.25 V High-Level Input Voltage VIH 2 - V Low-Level Input Voltage VIL - 0.8 V High-Level Output Current IOH - -0.4 mA Low-Level Output Current IOL - 8 mA Operating Temperature Range TJ 0 +85 °C Recommended Operating Conditions Absolute Maximum Ratings1 PARAMETER SYMBOL VALUE UNIT DC Supply Voltage VCC 7.0 V DC Input Voltage VIN 7.0 V Storage Temperature Range TSTG -65 to 150 °C LIMITS PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Minimum High-Level Input Voltage VIH - 2 - - V Maximum Low-Level Input Voltage VIL - - - 0.8 V Input Clamp Diode Voltage VIK VCC = MIN IIN = -18mA - -0.65 -1.5 V Output Voltage High VOH VCC = MIN, IOH = MAX VIN = VIL or VIH per Function Table 2.7 3.5 - V Output Voltage Low VOL VCC = MIN IOH = MAX VIN = VIL or VIH per Truth Table IOL = 8mA - 0.35 0.5 V VCC = MAX, VIN = 2.7V - - 20 µA Input High Current IIH VCC = MAX, VIN = 7.0V - - 0.1 mA Input Low Current IIL VCC = MAX, VIN = 0.4V - - -0.4 mA Short Circuit Current3 IOS VCC = MAX -20 - -100 mA Power Supply Current (Total) ICC VCC = MAX - 6.3 10 mA 2. All typical values @ VCC = 5V, TJ = 25°C. 3. Not more than one output should be shorted at a time, nor for more than 1 second. 1. Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. A ll data sheet.com
www.siliconsupplies.com Low Power Schottky Logic – 74LS138 Rev 1.0 21/11/17 AC Electrical Characteristics4 LIMITS DELAY PARAMETER SYMBOL CONDITIONS LEVELS MIN TYP MAX UNITS tPLH 2 - 13 20 Propagation Delay, Address to Output VCC = 5V, CL = 15pF tPHL 2 - 27 41 ns tPLH DISCLAIMER: The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Silicon Supplies Ltd hereby disclaims any and all warranties and liabilities of any kind. LIFE SUPPORT POLICY: Silicon Supplies Ltd components may be used in life support devices or systems only with the express written approval of Silicon Supplies Ltd, if a failure of such components can reasonably be expected to cause the failure of that life support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. 3 - 18 27 Propagation Delay, Other Input High VCC = 5V, CL = 15pF tPHL 3 - 26 39 ns tPLH 2 - 12 18 Propagation Delay, G2B or G2A Enable to Output tPHL VCC = 5V, CL = 15pF 2 - 21 32 ns tPLH 3 - 17 26 Propagation Delay, G1 Enable to Output tPHL VCC = 5V, CL = 15pF 3 - 25 38 ns 4. Not production tested in die form, characterized by chip design and tested in package . Logic Diagram Switching Waveforms A ll data sheet.com