AC Characteristics
Limits
Sym
Parameter
Min
0
Max
Units
MHz
MHz
ns
fEC
fESC
tECR
tECF
fED
tMR
tE1
15
Encoder clock frequency
Send clock frequency
Encoder clock rise time
Encoder clock fall time
Data rate
0
2.5
-
8
-
8
ns
0
1.25
MHz
ns
150
-
-
Master reset pulse width
Shift clock delay
Figure 7: Encoder Electrical
Characteristics
125
ns
tE2
75
75
90
100
55
150
0
-
ns
Serial data setup time
Serial data hold time
Enable setup time
Enable pulse width
Sync setup time
tE3
-
ns
tE4
-
-
ns
tE5
ns
tE6
-
ns
tE7
-
ns
Sync pulse width
tE8
50
130
ns
Send data delay
tE9
-
ns
Bipolar output delay
1. VDD = 5V ±10%, over full operating temperature range. 2. CL=50pF.
Limits
Sym
Parameter
Min
Typ
Max
Units
MHz
MHz
ns
fDC
tDCR
tDCF
fDD
tDR
tDRS
tMR
tD1
0
-
15
Decoder clock frequency
Decoder clock rise time
Decoder clock fall time
Data rate
-
-
8
-
-
8
0
-
1.25
MHz
ns
150
-
-
Decoder reset pulse width
Decoder reset setup time
Master reset pulse width
Bipolar data pulse width
Sync transition span
One-Zero overlap
75
-
-
ns
150
-
-
ns
tDC + 10
-
-
-
ns
Figure 8: Decoder Electrical
Characteristics
tD2
-
-
18tDC
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tD3
-
tDC - 10
-
tD4
-
6tDC
Short data transition span
Long data transition span
Sync delay (on)
tD5
-
12tDC
-
tD6
-20
0
-
-
-
-
-
-
-
110
110
80
tD7
Take data delay (on)
Serial data out delay
Sync delay (off)
tD8
tD9
0
0
0
110
110
110
tD10
tD11
Take data delay (off)
Valid word delay
1. VDD = 5V ±10%, over full operating temperature range. 2. CL=50pF.
3. tDC = Decoder clock period = 1/fDC
Aeroflex Circuit Technology
5
SCD15530 REV B 7/28/99 Plainview NY (516) 694-6700
AEROFLEX [ AEROFLEX CIRCUIT TECHNOLOGY ]
