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參數(shù)資料
| 型號： | 7643 |
| 英文描述： | IrDA. protocol handler plus endec for DCE Apps, -40C to +85C, 18-SOIC 300mil, TUBE |
| 中文描述： | 7643Group數(shù)據(jù)表數(shù)據(jù)表1369K/JUL.30.03 |
| 文件頁數(shù)： | 60/120頁 |
| 文件大?。?/td> | 1369K |
| 代理商： | 7643 |
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Rev.1.00 Jul 30, 2003 page 60 of 119
7643 Group
CLOCK GENERATING CIRCUIT
The 7643 group has two built-in oscillation circuits. An oscillation
circuit can be formed by connecting a resonator between X
IN
and
X
OUT
(X
CIN
and X
COUT
). Use the circuit constants in accordance
with the resonator manufacturer’s recommended values. No exter-
nal resistor is needed between X
IN
and X
OUT
since a feed-back
resistor exists on-chip. However, an external feed-back resistor is
needed between X
CIN
and X
COUT
.
When using an external clock, input the clocks to the X
IN
or X
CIN
pin and leave the X
OUT
or X
COUT
pin open.
Immediately after power on, only the X
IN
oscillation circuit starts
oscillating, and X
CIN
and X
COUT
pins function as I/O ports.
Frequency Control
The internal system clock can be selected among f
SYN
, f(X
IN
),
f(X
IN
)/2, and f(X
CIN
). The internal clock
φ
is half the frequency of
internal system clock.
(1) f
SYN
clock
This is made by the frequency synthesizer. f(X
IN
) or f(X
CIN
) can be
selected as its input clock. See also section “FREQUENCY SYN-
THESIZER”.
(2) f(X
IN
) clock
The frequency of internal system clock is the frequency of X
IN
pin.
(3) f(X
IN
)/2 clock
The frequency of internal system clock is half the frequency of X
IN
pin.
(4) f(X
CIN
) clock
The frequency of internal system clock is the frequency of X
CIN
pin.
■
Note
If you switch the oscillation between X
IN
- X
OUT
and X
CIN
- X
COUT
,
stabilize both X
IN
and X
CIN
oscillations. The sufficient time is re-
quired for the X
CIN
oscillation to stabilize, especially immediately
after power on and at returning from the stop mode.
Fig. 56 Ceramic resonator or quartz-crystal oscillator exter-
nal circuit
Fig. 57 External clock input circuit
X
CIN
X
COUT
X
IN
X
OUT
C
IN
C
OUT
C
CIN
C
COUT
Rf
Rd
V
CC
V
SS
X
CIN
X
COUT
X
IN
X
OUT
Open
Open
External oscillation
circuit
External oscillation
circuit
V
CC
V
SS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 765-11-(SERIES) | Analog IC |
| 765-11-20K | Analog IC |
| 765-11-25A | Analog IC |
| 765-11E | 8 BIT INPUT/OUTPUT EXPANDER, I2C INTERFACE, -40C to +125C, 20-QFN, TUBE |
| 765-11R | 8-bit I/O Expander with I2C Interface., -40C to +125C, 18-SOIC 300mil, TUBE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 764-3"x36yd-Red | 功能描述:膠帶 764 RED 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-White | 功能描述:膠帶 WHITE 3X36YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 764-3"x36yd-Yellow | 功能描述:膠帶 764 YELLOW 3X36 YD BULK RoHS:否 制造商:3M Electronic Specialty 產(chǎn)品:Tapes 類型:Shielding 描述/功能:EMI/RFI Foil Shielding Tape 顏色: 材料:Copper Foil 寬度:1 in x 18 yds |
| 7643_06 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:8-BIT SINGLE-CHIP MICROCOMPUTER |
| 76430 | 制造商:Brady Corporation 功能描述:TAPE, BARRICADE, BLACK/PHOSPHORESCENT, 2INX5YD; Tape Type:Safety, Hazard Warning; Tape Backing Material:Polyester Film; Tape Width - Metric:50.8mm; Tape Width - Imperial:2"; Tape Length - Metric:4.572m; Tape Length - Imperial:5yard ;RoHS Compliant: NA |
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