DM74LS93M

DM74LS90/DM74LS93 Decade and Binary Counters March 1998 DM74LS90/DM74LS93 Decade and Binary Counters General Description Each of these monolithic counters contains four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the ’LS90 and divide-by-eight for the ’LS93. All of these counters have a gated zero reset and the LS90 also has gated set-to-nine inputs for use in BCD nine’s complement applications. To use their maximum count length (decade or four bit binary), the B input is connected to the QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate truth table. A symmetrical divide-by-ten count can be obtained from the ’LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA. Features n Typical power dissipation 45 mW n Count frequency 42 MHz Connection Diagrams (Dual-In-Line Packages) DS006381-1 Order Number DM74LS90M or DM74LS90N See Package Number M14A or N14A DS006381-2 Order Number DM74LS93M or DM74LS93N See Package Number M14A or N14A © 1998 Fairchild Semiconductor Corporation DS006381 www.fairchildsemi.com Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage (Reset) Input Voltage (A or B) 7V 7V 5.5V Operating Free Air Temperature Range DM74LS Storage Temperature Range 0˚C to +70˚C...