Datasheet

Table 30. Input clock jitter spec parameter
Parameter Sy
mbol
-18I -25I -3I
Units
Notes
Min. Max. Min. Max. Min. Max.
Clock period jitter
t
JIT (
per) -90 90 -100 100 -125 125 ps 33
Clock period jitter during DLL locking
period
t
JIT
(per,lck) -80 80 -80 80 -100 100 ps 33
Cycle to cycle clock period jitter
t
JIT
(cc) -180 180 -200 200 -250 250 ps 33
Cycle to cycle clock period jitter
during DLL locking period
t
JIT
(cc,lck) -160 160 -160 160 -200 200 ps 33
Cumulative error across 2 cycles
t
ERR
(2per) -132 132 -150 150 -175 175 ps 33
Cumulative error across 3 cycles
t
ERR
(3per) -157 157 -175 175 -225 225 ps 33
Cumulative error across 4 cycles
t
ERR
(4per) -175 175 -200 200 -250 250 ps 33
Cumulative error across 5 cycles
t
ERR
(5per) -188 188 -200 200 -250 250 ps 33
Cumulative error across n cycles,
n=6...10, inclusive
t
ERR
(6-
10per)
-250 250 -300 300 -350 350 ps 33
Cumulative error across n cycles,
n=11...50, inclusive
t
ERR
(11-
50per)
-425 425 -450 450 -450 450 ps 33
Duty cycle jitter
t
JIT
(duty) -75 75 -100 100 -125 125 ps 33
Definitions:
- t
CK
(avg)
t
CK
(avg) is calculated as the average clock period across any consecutive 200 cycle window.
()
=
⎡⎤
=
⎢⎥
⎣⎦
∑
j
CK CK
1
/N
tt
N
j
avg where N=200
- t
CH
(avg) and t
CL
(avg)
t
CH
(avg) is defined as the average HIGH pulse width, as calculated across any consecutive 200 HIGH pulses.
() ()
()
=
⎡⎤
=×
⎢⎥
⎣⎦
∑
j
CH CH CK
1
/
ttt
N
j
avg N avg
where N=200
t
CL
(avg) is defined as the average LOW pulse width, as calculated across any consecutive 200 LOW pulses.
() ()
()
=
⎡⎤
=×
⎢⎥
⎣⎦
∑
j
CL CL CK
1
/
ttt
N
j
avg N avg
where N=200
t
JIT
(duty) is defined as the cumulative set of t
CH
jitter and t
CL
jitter. t
CH
jitter is the largest deviation of
any single t
CH
from t
CH
(avg). t
CL
jitter is the largest deviation of any single t
CL
from t
CL
(avg).
- t
JIT
(duty) = Min/max of {t
JIT
(CH), t
JIT
(CL)}
where,
t
JIT
(CH) = {t
CHi
- t
CH
(avg) where i=1 to 200}
t
JIT
(CL) = {t
CLi
- t
CL
(avg) where i=1 to 200}
AS4C32M16D2A-25BIN
Alliance Memory Inc.
511 Taylor Way, San Carlos, CA 94070 TEL: [phone] FAX: [phone]
Alliance Memory Inc. reserves the right to change products or specification without notice
Rev.1.2
32
Jun./2014