CD54HC138/3A CD54HCT138/3A S E M I C O N D U C T O R COMPLETE DATA SHEET COMING SOON! June 1997 Description 3-to-8-Line Decoder/Demultiplexer Functional Diagram The CD54HC138/3A and CD54HCT138/3A are high-speed silicon-gate CMOS decoders well suited to memory address decoding or data routing application. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low-power Schottky TTL logic. The circuits have three binary select inputs (A0, A1, and A2). If the device is enabled, these inputs determine which one of the eight normally high outputs will go low. A0 A1 A2 E1 E2 E3 A0 - A2 1.5 E1, E2 1.25 E3 1 2 14 3 13 11 HCT INPUT LOAD TABLE UNIT LOAD (NOTE 1) 15 12 Two active low and one active high enables (E1, E2, and E3) are provided to ease the cascading of decoders. The decoder's outputs can drive 10 low-power Schottky TTL equivalent loads. INPUT 1 4 10 5 9 6 7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 NOTE: 1. Unit load is ICC limit specified in DC Electrical Specifications Table, e.g., 360A Max at +25oC. Absolute Maximum Ratings DC Supply Voltage, VCC Voltages Referenced to GND . . . . . . . . . . . . . . . . . -0.5V to +7.0V DC Input Voltage Range, All Inputs, VIN . . . . . . . -0.5V to VCC +0.5V DC Output Voltage Range, All Outputs, VOUT . . -0.5V to VCC +0.5V DC Input Diode Current, IIK For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .20mA DC Output Diode Current, IOK For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . .20mA DC Drain Current, Per Output, IO, For -0.5V < VO < VCC + 0.5V Standard Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25mA Bus Driver Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35mA DC VCC or GND Current, ICC Standard Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50mA Bus Driver Output. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70mA Power Dissipation Per Package, PD TA = -55oC to +100oC (Package F) . . . . . . . . . . . . . . . . . . 500mW TA = +100oC to +125oC (Package F) . . . . . . . . Derate Linearly at 8mW/ oC to 300mW Operating Temperature Range, TA Package Type F . . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to +125oC Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . -65oC to +150oC Lead Temperature (During Soldering) At Distance 1/16in. 1/32in. (1.59mm 0.79mm) From Case For 10s Max . . . . . . . . . . . . . . . . . . . . . . . . . . +265oC Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm) With Solder Contacting Lead Tips Only. . . . . . . . . . . . . . . +300oC CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Recommended Operating Conditions Operating Temperature Range, TA . . . . . . . . . . . . . -55oC to +125oC Input Rise and Fall Times, tR, tF at 2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0ns to 1000ns at 4.5V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0ns to 500ns at 6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0ns to 400ns Supply Voltage Range, VCC TA = Full Package Temperature Range CD54HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V CD54HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V DC Input or Output Voltage, VIN, VOUT . . . . . . . . . . . . . . . 0V to VCC CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures. Copyright (c) Harris Corporation 1994 1 File Number 3779