Decade and Binary Counters
DM5490 DM7490A DM7493A Decade and Binary Counters
www.DataSheet4U.com
July 1992
DM5490 DM7490A DM7493A Decade and Bin...
Description
DM5490 DM7490A DM7493A Decade and Binary Counters
www.DataSheet4U.com
July 1992
DM5490 DM7490A DM7493A Decade and Binary Counters
General Description
Each of these monolithic counters contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five for the 90A and divideby-eight for the 93A
All of these counters have a gated zero reset and the 90A 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 90A 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
Y Typical power dissipation 90A 145 mW 93A 130 mW
Y Count frequency 42 MHz
Connection Diagrams
Dual-In-Line Package
TL F 6533 – 1
Order Number DM5490J DM5490W or DM7490AN See NS Package Number J14A N14A or W14B
Dual-In-Line Package
Order Number DM7493AN See NS Package Number N14A
TL F 6533 – 2
C1995 National Semiconductor Corporation TL F 6533
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales O...
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