LS7166 View Datasheet(PDF) - LSI Corporation

Part Name

Description

Manufacturer

LS7166

24-BIT QUADRATURE COUNTER

LSI Corporation  

LTCR

TLCW

TLC

TCL

UP CLK (A)

TCH

DN CLK (B)

TUDD

TCH

TCL

Q0

(Internal)

Q1

(Internal)

Q2-Q23

(Internal)

CNTR=FFFFFD CNTR=FFFFFE CNTR=FFFFFF CNTR=000000 CNTR=0000001 CNTR=000000 CNTR=FFFFFF CNTR=FFFFFE CNTR=FFFFFD

(PR=CNTR)

(PR=CNTR)

COMP

CY

NOTE 2

BW

FIGURE 2 . LOAD COUNTER, UP CLOCK, DOWN CLOCK, COMPARE OUT, CARRY, BORROW

NOTE 1: The counter in this example is assumed to be operating in the binary mode.

NOTE 2: No COMP output is generated here, although PR = CNTR. COMP output is disabled with a counter load command and

enabled with the rising edge of the next clock, thus eliminating invalid COMP outputs whenever the CNTR is loaded from the PR.

NOTE 3: When UP Clock is active, the DN Clock should be held "HIGH" and vice versa.

UP CLK

OR DN CLK

CY

TCBL

CYT

BW

BWT

COMP

COMPT

SIGN

(INTERNAL)

7166-110103-7

TCBH

TTFH

TCBL

TCBH

TTFH

TTFH

TTFL

TTFL

TCBL

TTFL

TCBH

FIGURE 3. CLOCK TO CY/BW OUTPUT PROPAGATION DELAYS

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