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參數(shù)資料
| 型號(hào)： | CXD4000R |
| 英文描述： | Fingerprint Verification System LSI |
| 中文描述： | 指紋識(shí)別系統(tǒng)LSI |
| 文件頁(yè)數(shù)： | 7/14頁(yè) |
| 文件大小： | 216K |
| 代理商： | CXD4000R |
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7
–
CXD4000R
AC Characteristics
(1) Oscillation Inverter I/O Characteristics
(Within the recommended operating range)
Note)
When using USB, the oscillation frequency should be 48MHz ± 0.25%.
Item
Microcomputer
system clock
period
Verification
engine clock
period
Symbol
t
SYS
t
ENG
Conditions
Min.
Max.
41.57
83.13
166.26
332.51
20.79
41.57
83.13
166.26
332.51
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Frequency division value 1/2 (clock frequency
φ
= f
EX
/2)
Frequency division value 1/4 (clock frequency
φ
= f
EX
/4)
Frequency division value 1/8 (clock frequency
φ
= f
EX
/8)
Frequency division value 1/16 (clock frequency
φ
= f
EX
/16)
Frequency division value 1/1 (clock frequency = f
EX
)
Frequency division value 1/2 (clock frequency = f
EX
/2)
Frequency division value 1/4 (clock frequency = f
EX
/4)
Frequency division value 1/8 (clock frequency = f
EX
/8)
Frequency division value 1/16 (clock frequency = f
EX
/16)
100
200
400
800
50
100
200
400
800
(3) Reset Input
(Within the recommended operating range)
Fig. 1. Reset Input Timing
RST
t
RST
Item
Reset input low
level width
Symbol
t
RST
Pins
RST
Conditions
Min.
Max.
4/f
EX
+ 20
Unit
ns
Clock oscillation stabilized
—
Item
Logical Vth
Input voltage
Output voltage
Feedback
resistor
Oscillation
frequency
Symbol
LVth
V
IH
V
IL
V
OH
V
OL
RFB
f
EX
Pins
EXTAL
EXTAL
XTAL
EXTAL
XTAL
EXTAL
XTAL
Conditions
Min.
Typ.
Max.
0.7V
DD
V
DD
/2
250k
20
Unit
V
V
V
V
V
MHz
Feed current where I
OH
=
–
3.0mA
Pull-in current where I
OL
= 3.0mA
V
IN
= V
DD
or Vss
V
DD
/2
1M
0.3V
DD
V
DD
/2
2.5M
48.12
(2) Frequency Division Clock Timing
(Within the recommended operating range)
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