CTS9513API-2 datasheet(21/28 Pages) ETC

21 / 28 page

Celeritous Technical Services Corp

800.687.6510 / 806.793.0708

3308 34th St

FAX

806.793.0710

Lubbock, Texas 79410

http://www.celeritous.com

SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

Rev E

Tuesday, September 25,

CTS9513-2

5 Chan 16 bit 20MHz Counter/Timer

MODE Q RATE GENERATOR WITH

SYNCHRONIZATION

Mode Q provides a continuous rate generator which

may be externally gated or synchronized to an

external event via the Gate input. As shown in Figure

24, once an ARM command is received, the counter

will continuously count to TC, reload the Load

asserted. While the Gate line is deasserted the

counter is inhibited. On the active going edge of the

gate signal the counter is reloaded from the Load

on the second valid source edge following the Gate

edge.

SOURCE

DATA

ARM COMMAND

GATE

COUNT VALUE

TC OUTPUT

TOGGLE OUTPUT

L-1

L-2

...

N+1

L-1

...

L-1

L-2

COUNTER MODE Q WAVEFORMS

Figure 24 - CTS9513 Counter Mode Q Representative Waveforms

SOURCE

DATA

ARM COMMAND

GATE

COUNT VALUE

TC OUTPUT

TOGGLE OUTPUT

L-1

L-2

...

COUNTER MODE R WAVEFORMS

N+2

N+1

L-1

L-2

L-1

Figure 25 - CTS9513 Counter Mode R Representative Waveforms

MODE R RETRIGGERABLE ONE-SHOT

Mode R, as shown in

Figure 25, begins counting

only after receipt of an ARM command and a valid

active Gate edge. The counter will count once to TC

and stop. The counter will remain inactive until

receipt of a subsequent valid Gate edge.

If a valid Gate Edge is received prior to the counter

reaching TC the counter value will be saved in the

Hold register and the counter reloaded from the Load

counter in insensitive to the Gate level and gate

actions do no inhibit the counter as in Mode Q.

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