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LS7266R1 Datasheet(PDF) 6 Page - LSI Computer Systems

Part # LS7266R1
Description  24-BIT DUAL-AXIS QUADRATURE COUNTER
Download  14 Pages
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS7266R1 Datasheet(HTML) 6 Page - LSI Computer Systems

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7266R1-011498-6
Transient Characteristics. (TA = -25˚C to +80˚C, VDD = 4.5V to 5.5V)
Parameter
Symbol
Min. Value
Max.Value
Unit
Remarks
Read Cycle (See Fig. 1)
RD Pulse Width
tr1
50
-
ns
-
CS Set-up Time
tr2
50
-
ns
-
CS Hold Time
tr3
0
-
ns
-
C/D Set-up Time
tr4
50
-
ns
-
C/D Hold Time
tr5
10
-
ns
-
X/Y Set-up Time
tr6
50
-
ns
-
X/Y Hold Time
tr7
10
-
ns
-
Data Bus Access Time
tr8
50
-
ns
Access starts when both RD
and CS are low.
Data Bus Release Time
tr9
-
25
ns
Release starts when either RD
or CS is terminated.
Back to Back Read delay
tr10
60
-
ns
-
Write Cycle (See Fig. 2)
WR Pulse Width
tW1
30
-
ns
-
CS Set-up Time
tW2
30
-
ns
-
CS Hold Time
tW3
0
-
ns
-
C/D Set-up Time
tW4
30
-
ns
-
C/D Hold Time
tW5
10
-
ns
-
X/Y Set-up Time
tW6
30
-
ns
-
X/Y Hold Time
tW7
10
-
ns
-
Data Bus Set-up Time
tW8
30
-
ns
-
Data Bus Hold Time
tW9
10
-
ns
-
Back to Back Write Delay
tW10
60
-
ns
-
Quadrature Mode (See Fig. 3-5)
FCK High Pulse Width
t1
14
-
ns
-
FCK Low Pulse Width
t2
14
-
ns
-
FCK Frequency
fFCK
-
35
MHz
-
Mod-n Filter Clock(FCKn)Period
t3
28
-
ns
t3 = (n+1) (t1+t2), where
n = PSC = 0 to FFH
FCKn frequency
fFCKn
-
35
MHz
-
Quadrature Separation
t4
57
-
ns
t4
≥ 2t3
Quadrature Clock Pulse Width
t5
115
-
ns
t5
≥ 4t3
Quadrature Clock frequency
fQA, fQB
-
4.3
MHz
fQA = fQB = 1/8t3
Quadrature Clock to Count Delay
tQ1
5t3
6t3
-
-
X1/X2/X4 Count Clock Pulse Width tQ2
28
-
ns
tQ2 = t3
Index Input Pulse Width
tidx
85
-
ns
tidx
≥ 3t3
Index Skew from A
tAi
-
28
ns
tAi
≤ t3
Carry/Borrow/Compare Output Width
tQ3
28
-
ns
tQ3 = t3
Non-Quadrature Mode (See Fig. 6-7)
Clock A - High Pulse Width
t6
16
-
ns
-
Clock A - Low Pulse Width
t7
16
-
ns
-
Direction Input B Set-up Time
t8S
20
-
ns
-
Direction Input B Hold Time
t8H
20
-
ns
-
Gate Input (ABG) Set-up Time
tGS
20
-
ns
-
Gate Input (ABG) Hold Time
tGH
20
-
ns
-
Clock Frequency (non-Mod-N)
fA
-
30
MHz
fA = (1/ (t6 + t7) )
Clock Frequency (Mod-N)
fAN
-
25
MHz
-
Clock to Carry or Borrow Out Delay
t9
-
30
ns
-
Carry or Borrow Out Pulse Width
t10
16
-
ns
t10 = t7
Load CNTR, Reset CNTR and
Load OL Pulse Width
t11
20
-
ns
-
Clock to Compare Out Delay
t12
50
-
ns
-


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