ꢀ ꢁ ꢂ ꢃ ꢄꢅ ꢆ ꢇ ꢄꢈꢈ ꢉ ꢀꢁ ꢂꢃ ꢄ ꢅ ꢆꢇ ꢄ ꢈꢈ ꢊ
ꢋ ꢌ ꢍꢎꢏ ꢐꢑ ꢒꢌ ꢓ ꢀ ꢏ ꢌ ꢔꢌ ꢀꢕꢖ ꢂ ꢌ ꢔꢓ ꢕꢖ ꢑ ꢗꢒ ꢆꢎꢂ ꢂꢒ ꢗꢂ
SPRS073L − AUGUST 1998 − REVISED JUNE 2005
INPUT AND OUTPUT CLOCKS
†‡
timing requirements for CLKIN (see Figure 13)
−150
CLKMODE = x4 CLKMODE = x1
−167
CLKMODE = x4 CLKMODE = x1
NO.
UNIT
MIN
26.7
0.4C
0.4C
MAX
MIN
6.7
MAX
MIN
24
MAX
MIN
6
MAX
1
2
3
4
t
t
t
t
Cycle time, CLKIN
ns
ns
ns
ns
c(CLKIN)
w(CLKINH)
w(CLKINL)
t(CLKIN)
Pulse duration, CLKIN high
Pulse duration, CLKIN low
Transition time, CLKIN
0.45C
0.45C
0.4C
0.4C
0.45C
0.45C
5
1
5
1
†
‡
The reference points for the rise and fall transitions are measured at V MAX and V MIN.
C = CLKIN cycle time in ns. For example, when CLKIN frequency is 40 MHz, use C = 25 ns.
IL
IH
1
4
2
CLKIN
3
4
Figure 13. CLKIN Timings
46
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