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參數(shù)資料
| 型號： | MAX7391CVVB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 12 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| 封裝： | MO-187C-AA, MICRO, SOP-8 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 594K |
| 代理商： | MAX7391CVVB |
MAX7391
Speed-Switching Clock Generator
with Power Fail
8
_______________________________________________________________________________________
Applications Information
Interfacing to a Microcontroller
Clock Input
The clock output is a push-pull, CMOS logic output,
which directly drives any microprocessor (P) or micro-
controller (C) clock input. There are no impedance-
matching issues when using the MAX7391. Operate the
MAX7391 and C (or other clock input device) from the
same supply voltage level. Refer to the microcontroller
data sheet for clock-input compatibility with external
clock signals. Table 3 lists clock output frequency.
The MAX7391 requires no biasing components or load
capacitance. When using the MAX7391 to retrofit a
crystal oscillator, remove all biasing components from
the oscillator input.
Power-Supply Considerations
The MAX7391 operates with power-supply voltages in
the 2.7V to 5.5V range. Good power-supply decoupling
is needed to maintain the power-supply rejection per-
formance of the MAX7391. Bypass VCC to GND with a
0.1F surface-mount ceramic capacitor. Mount the
bypass capacitor as close to the device as possible. If
possible, mount the MAX7391 close to the microcon-
troller’s decoupling capacitor so that additional decou-
pling is not required.
A larger-value bypass capacitor is recommended if the
MAX7391 is to operate with a large capacitive load.
Use a bypass capacitor value of at least 1000 times
that of the output load capacitance.
Output Jitter
The MAX7391’s jitter performance is given in the
Electrical Characteristics table as a peak-to-peak value
obtained by observing the output of the device for 20s
with a 500MHz oscilloscope. Jitter measurements are
approximately proportional to the period of the output
frequency of the device. Thus, a 4MHz part has approx-
The jitter performance of all clock sources degrades in
the presence of mechanical and electrical interference.
The MAX7391 is immune to vibration, shock, and EMI
influences, and thus provides a considerably more
robust clock source than crystal- or ceramic-resonator-
based oscillator circuits.
Table 1. POR Voltage
POWER-ON RESET VOLTAGE (VTH)
r
4.38
M
3.96
J
3.44
N
3.34
P
3.13
Q
2.89
S
2.82
V
2.5
X
Table 2. Reset Output Type
OUTPUT TYPE
s
Push-pull RST
A
Push-pull RST
B
Open collector
RST
C
Table 3. Clock Output Frequency
CLOCK FREQUENCY (fCLOCK) (MHz)
ff
4RD
8TP
12
VB
16
WB
Note: Contact factory for other frequencies.
Note: Standard values are shown in bold. Contact factory for
other POR voltages.
Note: Standard values are shown in bold. Contact factory for
other output types.
Note: Other versions with different features are available. Refer to the MAX7387/MAX7388 and MAX7389/MAX7390 data sheets.
Selector Guide
PART
FREQUENCY RANGE
(MHz)
RESET
FUNCTION
WATCHDOG INPUT
(WDI) / WATCHDOG
OUTPUT (
WDO)
POWER-FAIL INPUT
(PFI)/POWER-FAIL
OUTPUT (PFO)
SPEED
PIN-
PACKAGE
MAX7387
1 to 32
Yes
Yes/yes
—
10 MAX
MAX7388
1 to 32
Yes
Yes/no
No/yes
—
8 MAX
MAX7389
1 to 32
Yes
Yes/yes
—
8 MAX
MAX7390
1 to 32
Yes
Yes/no
—
Yes
8 MAX
MAX7391
1 to 32
Yes
—
Yes/yes
Yes
8 MAX
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7391SRFF | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Speed-Switching Clock Generator with Power Fail |
| MAX7393 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Precision Silicon Oscillators with Enable or Autoenable |
| MAX7393ALT | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Precision Silicon Oscillators with Enable or Autoenable |
| MAX7393ALTWB | 功能描述:TCXO振蕩器 RoHS:否 制造商:AVX 封裝 / 箱體: 頻率:32.768 kHz 頻率穩(wěn)定性: 負(fù)載電容:15 pF 端接類型:SMD/SMT 電源電壓:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 輸出格式:CMOS 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 封裝:Reel |
| MAX7393ALTWB-T | 功能描述:TCXO振蕩器 RoHS:否 制造商:AVX 封裝 / 箱體: 頻率:32.768 kHz 頻率穩(wěn)定性: 負(fù)載電容:15 pF 端接類型:SMD/SMT 電源電壓:3 V 尺寸:2.5 mm W x 3.2 mm L x 1 mm H 輸出格式:CMOS 最小工作溫度:- 40 C 最大工作溫度:+ 85 C 封裝:Reel |
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