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參數資料
型號: PCT1789N
英文描述: PCT303DL
中文描述: PCT303DL
文件頁數: 32/40頁
文件大小: 632K
代理商: PCT1789N
PC-TEL, Inc.
55
1789N0DOCDAT01A-0399
PCT1789N DATA SHEET
S
WITCHING
C
HARACTERISTICS
!
PRELIMINARY
PRELIMINARY
S
WITCHING
C
HARACTERISTICS
General Inputs
Given values are: V
A
= charge pump, V
D
= 3.0 V to 5.25 V; T
A
= 0 °C to 70 °C for K-grade, –40 °C to +85 °C for
B-grade; C
L
= 20 pF.
Table 23 Switching Characteristics—General Inputs
Figure 18 General Inputs Timing Diagram
Parameter
a
Cycle time, MCLK
a.
All timing (except rise and fall time) is referenced to the 50% level of the waveform. Input test levels are:
V
IH
= V
D
– 0.4V, V
IL
= 0.4V. Rise and fall times are referenced to the 20% and 80% levels of the waveform.
The minimum RESET pulse width is the greater of 250ns or 10 MCLK cycle times.
M0 and M1 are typically connected to V
D
or GND and should not be changed during normal operation.
Symbol
t
mc
t
dty
t
r
t
f
t
mr
t
rl
t
mxr
Min
16.67
Typ
Max
Unit
ns
MCLK duty cycle
40
50
60
%
Rise time, MCLK
5
ns
Fall time, MCLK
5
ns
MCLK before RESET
10
cycles
RESET pulse width
b
b.
c.
250
ns
M0, M1 before RESET
c
150
ns
MCLK
V
IH
V
IL
RESET
t
f
t
mc
t
mr
t
rl
t
r
M0, M1
t
mxr
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