- P/N: 74LS90
- 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 DM74LS90.
All of these counters have a gated zero reset and the
DM74LS90 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
DM74LS90 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 ::
- Package: DIP 14Pin
- 메이커별 호환제품 Suffix:SN(Ti, On-Semi), HD(Hitachi), DM(Fairchild, National), 기타...
HD74LS90 / SN74LS90 / DM74LS90
- Typical power dissipation 45 mW
- Count frequency 42 MHz
*74 Series의 경우 재고 상황에 따라서 예고없이 기재된 메이커가 아닌 호환제품으로 출고 될 수 있습니다.
*N형과 P형의 구분 없이 출고 됩니다.
*메이커(Vendor) 지정 주문의 경우 영업부로 문의 후 주문하여 주시기 바랍니다.