Electronic Components Datasheet Search |
|
SN54ALS163B Datasheet(PDF) 12 Page - Texas Instruments |
|
|
SN54ALS163B Datasheet(HTML) 12 Page - Texas Instruments |
12 / 27 page SN54ALS161B, SN54ALS162B, SN54ALS163B, SN54AS161, SN54AS163 SN74ALS161B, SN74ALS163B, SN74AS161, SN74AS163 SYNCHRONOUS 4-BIT DECADE AND BINARY COUNTERS SDAS276A – DECEMBER 1994 – REVISED JULY 2000 12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION n-bit synchronous counters This application demonstrates how the ripple-mode carry circuit (see Figure 2) and the carry look-ahead circuit (see Figure 3) can be used to implement a high-speed n-bit counter. The SN54ALS162B counts in BCD. The ’ALS161B, ’AS161, ’ALS163B, and ’AS163 devices count in binary. When additional stages are added, the fmax decreases in Figure 2, but remains unchanged in Figure 3. Figure 2. Ripple-Mode Carry Circuit LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LSB To More Significant Stages Clear (L) Count (H) Disable (L) Load (L) Count (H) Disable (L) Clock fmax = 1/(CLK to RCO tPLH) + (ENT to RCO tPLH) (N – 2) + (ENT tsu) Figure 3. Carry Look-Ahead Circuit LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LOAD C5/T,3,4+ QA QB QC QD CLR A B C D CTR CT=0 M1 G3 G4 RCO CLK ENP ENT 3CT=MAX 1,5D LSB To More Significant Stages Clear (L) Count (H) Disable (L) Load (L) Clock fmax = 1/(CLK to RCO tPLH) + (ENP tsu) |
Similar Part No. - SN54ALS163B |
|
Similar Description - SN54ALS163B |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |