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DM74LS90 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM74LS90
Description  Decade and Binary Counters
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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TLF6381
June 1989
DM74LS90DM74LS93
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 com-
plement applications
To use their maximum count length (decade or four bit bina-
ry) 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 di-
vide-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
Y
Typical power dissipation 45 mW
Y
Count frequency 42 MHz
Connection Diagrams (Dual-In-Line Packages)
TLF6381 – 1
Order Number DM74LS90M or DM74LS90N
See NS Package Number M14A or N14A
TLF6381 – 2
Order Number DM74LS93M or DM74LS93N
See NS Package Number M14A or N14A
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A




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