Zakładka z wyszukiwarką danych komponentów |
|
74F525 Arkusz danych(PDF) 2 Page - National Semiconductor (TI) |
|
|
74F525 Arkusz danych(HTML) 2 Page - National Semiconductor (TI) |
2 / 10 page Logic Symbol TLF9547 – 1 Unit LoadingFan Out 74F Pin Names Description UL Input IIH IIL HIGHLOW Output IOH IOL Q Ouput (Primarily indicates when 50333 b 1 mA20 mA the counter has reached zero) Q2 Output (Divides Q by 2) 50333 b 1 mA20 mA M0–M2 Status Inputs 1010 20 mA b06 mA MR Master Reset 1010 20 mA b06 mA CP Clock Pulse 1020 20 mA b12 mA D0–D15 Data Inputs 1010 20 mA b06 mA WE Write Enable Input 1010 20 mA b06 mA XTR External Trigger Input 1020 20 mA b12 mA XTAL Crystal Output 1010 20 mA b06 mA Functional Description The multi-function aspect of the device consists of eight different modes of operation An explanation of the opera- tion of the device in each of the modes follows However there is one operation that is independent of the selected mode the loading of data Data is latched into a set of data latches when WE is brought from a LOW to a HIGH state The latches are transparent when WE is held LOW Operation Notes 1 Device should be reset before operation 2 The XTR input acts as a select line for the clock 3 With XTR low the clock goes into the counter 4 With XTR high the clock loads the counter 5 In mode 4 and 5 during counting the counter cannot be reloaded XTR high freezes the count 6 Mode 7 is the only auto-reload mode all other modes require and XTR pulse to begin 7 Loading 0 into the latches idles the device MODE 0 Interval Timer with Level Output While XTR is HIGH the data in the data latches is loaded into the counter upon the next positive edge of CP The negative edge of XTR enables the count-down to begin with the next positive edge of CP When the count reaches zero Q normally LOW is brought HIGH and Q2 toggles state Taking XTR HIGH at any time enables the data in the data latches to be loaded into the counter on the rising edge of CP and clears Q See Figure 1 MODE 1 Interval Timer with Inverted Level Output The operation is exactly the same as in Mode 0 except that Q is normally HIGH and goes LOW when the count reaches zero Q2 toggles on the negative-edge of Q See Figure 1 MODE 2 Interval Timer with Pulse Output While XTR is HIGH the data in the data latches is loaded into the counter upon the next positive edge of CP The negative edge of XTR enables the count-down to begin with the next positive edge of CP When the count reaches zero Q normally LOW is brought HIGH for a single period of CP Q2 toggles state on the positive edge of Q Taking XTR HIGH at any time causes the data in the data latches to be loaded into the counter on the rising edge of CP and clears Q See Figure 2 MODE 3 Interval Timer with Inverted Pulse Output The operation is exactly the same as in Mode 2 except that Q is normally HIGH and goes LOW for a single period of CP Q2 toggles on the negative edge of Q See Figure 2 2 |
Podobny numer części - 74F525 |
|
Podobny opis - 74F525 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |