ꢀ
ꢁꢂ ꢃ ꢄ ꢅ ꢆꢇ ꢈ ꢉꢈ ꢀꢊ ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢆꢇ ꢈ ꢉꢋ ꢀꢊ ꢀ ꢁꢂ ꢃ ꢄꢅ ꢆꢇ ꢈꢉ ꢇꢀ
ꢌ ꢍꢎ ꢏꢐꢑꢒꢓ ꢍ ꢔꢀ ꢐꢍ ꢕꢍ ꢀꢖꢗ ꢂꢍ ꢕ ꢔꢖꢗ ꢒꢘ ꢓ ꢆꢏ ꢂ ꢂꢓ ꢘ ꢂ
SPRS226H − NOVEMBER 2003 − REVISED AUGUST 2005
†‡§
timing requirements for CLKIN for -850 devices
(see Figure 16)
−850
PLL MODE x20
PLL MODE x12
PLL MODE x6
x1 (BYPASS)
NO.
UNIT
MIN
23.5
0.4C
0.4C
MAX
MIN
14
MAX
MIN
13.3
0.4C
0.4C
MAX
MIN
0
MAX
1
2
3
4
5
t
t
t
t
t
Cycle time, CLKIN
40
23.8
23.8
10
ns
ns
ns
ns
ns
c(CLKIN)
w(CLKINH)
w(CLKINL)
t(CLKIN)
Pulse duration, CLKIN high
Pulse duration, CLKIN low
Transition time, CLKIN
Period jitter, CLKIN
0.4C
0.4C
0.45C
0.45C
5
5
5
1
0.02C
0.02C
0.02C
0.02C
J(CLKIN)
†
‡
§
The reference points for the rise and fall transitions are measured at V MAX and V MIN.
For more details on the PLL multiplier factors (x6, x12, x20), see the Clock PLL section of this data sheet.
C = CLKIN cycle time in ns. For example, when CLKIN frequency is 50 MHz, use C = 20 ns.
IL
IH
†‡§
timing requirements for CLKIN for -1G devices
(see Figure 16)
−1G
PLL MODE x20
PLL MODE x12
PLL MODE x6
x1 (BYPASS)
NO.
UNIT
MIN
20
MAX
MIN
13.3
0.4C
0.4C
MAX
MIN
13.3
0.4C
0.4C
MAX
MIN
0
MAX
1
2
3
4
5
t
t
t
t
t
Cycle time, CLKIN
40
23.8
23.8
10
ns
ns
ns
ns
ns
c(CLKIN)
w(CLKINH)
w(CLKINL)
t(CLKIN)
Pulse duration, CLKIN high
Pulse duration, CLKIN low
Transition time, CLKIN
Period jitter, CLKIN
0.4C
0.4C
0.45C
0.45C
5
5
5
1
0.02C
0.02C
0.02C
0.02C
J(CLKIN)
†
‡
§
The reference points for the rise and fall transitions are measured at V MAX and V MIN.
For more details on the PLL multiplier factors (x6, x12, x20), see the Clock PLL section of this data sheet.
C = CLKIN cycle time in ns. For example, when CLKIN frequency is 50 MHz, use C = 20 ns.
IL
IH
1
5
4
2
CLKIN
3
4
Figure 16. CLKIN Timing
81
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TI [ TEXAS INSTRUMENTS ]
