LS7267 datasheet(9/15 Pages) LSI

9 / 15 page

7267-091615-9

Parameter

Symbol Min. Value

Max.Value

Unit

Remarks

For VDD = 5V:

Quadrature Mode (See Fig. 3-5)

FCK High Pulse Width

FCK Low Pulse Width

FCK Frequency

fFCK

MHz

Mod-n Filter Clock(FCKn)Period

= (n+1) (t1+t2),

where n = PSC = 0 to FFH

FCKn frequency

fFCKn

MHz

Quadrature Separation

t4 > t3

Quadrature Clock Pulse Width

t5 > 4t3

Quadrature Clock frequency

fQA, fQB

5.6

MHz

fQA = fQB = 1/(2t5)

Quadrature Clock to Count Delay

tQ1

x1/x2/x4 Count Clock Pulse Width tQ2

tQ2

= t3

Index Input Pulse Width

tidx

tidx > 2

Index setup/hold time

tsi/thi

INDX output width

tQ3

tQ3 = (t3 - t2)

Carry/Borrow/Compare Output Width

tQ3

= (t3 - t2)

Non-Quadrature Mode (See Fig. 6-7)

Clock A - High Pulse Width

Clock A - Low Pulse Width

Direction Input B Set-up Time

tbs

Direction Input B Hold Time

tbh

Gate Input (ABG) Set-up Time

tGS

Gate Input (ABG) Hold Time

tGH

Clock Frequency

MHz

= (1/ (t6 + t7) )

Clock to Carry or Borrow Out Delay

Carry or Borrow Out Pulse Width

t10

t10 = t7

Clock to Compare Out Delay

t12

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