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PDF 74F525 Data sheet ( Hoja de datos )
| Número de pieza | 74F525 | |
| Descripción | Programmable Counter | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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www.DataSheet4U.com
August 1995
74F525
Programmable Counter
General Description
The ’F525 is a multi-function 28-pin device It consists of a
16-bit count-down counter logic to control the counter logic
to control the state of the outputs and a PLA to decode the
particular function selected by the user The list of high-
speed timing applications include
Features
Y Baud rate generator
Y Digitally programmed monostable
Y Variable system frequency generator
Y Digital filter variable sampling rate
Y 16-bit data path
Y External trigger
Y Extremely accurate one shot w pulse widths from
50 ns to 3 27 ms CP e 40 MHz
Commercial
74F525QC (Note 1)
74F525SC (Note 1)
74F525PC
Package
Number
V28A
M28B
N28B
Package Description
28-Lead Molded Plastic Leaded Chip Carrier
28-Lead (0 300 Wide) Molded Small Outline JEDEC
28-Lead (0 600 Wide) Molded Dual-In-Line Package
Note 1 Devices also available in 13 reel Use suffix e SCX and QCX
Connection Diagrams
Pin Assignment
DIP and SOIC
Pin Assignment
for PCC
TL F 9547 – 2
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 9547
TL F 9547 – 3
RRD-B30M105 Printed in U S A
1 page  
Timing Diagrams (Continued)
FIGURE 4 MODE 6
Mn e 110
jWith XTR HIGH the rising edge of CP loads data from the latches to the counter
TL F 9547 – 8
kWith XTR LOW the rising edge of CP begins the count and Q goes HIGH
lWhen the count reaches zero Q goes LOW and Q 2 toggles state Bringing XTR HIGH before count reaches zero will reload the counter but not affect Q
Notes
Loading Ne0 halts counter loading Ne1 will result in undefined operation
Pulse width e (2 CP) (Nb1)
FIGURE 5 MODE 7
Mn e 111
jWith XTR HIGH the rising edge of CP loads data from the latches to the counter
kOn the falling edge of XTR the rising edge of CP begins count-down
lWhen count reaches zero Q goes HIGH for one period of CP and Q 2 toggles on the Q rising edge
mOn the rising edge of CP on which Q goes LOW the counters are reloaded
nCount-down begins again
TL F 9547 – 9
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74F525.PDF ] | |
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