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參數(shù)資料
| 型號： | MAX7384A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Silicon Oscillator with Low-Power Frequency Switching and Reset Output |
| 中文描述： | 硅振蕩器的低功耗高頻開關(guān)和復位輸出 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 732K |
| 代理商： | MAX7384A |
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Detailed Description
The MAX7384 is a dual-speed clock generator with inte-
grated reset for microcontrollers (μCs) and UARTs in 3V,
3.3V, and 5V applications. The MAX7384 is a replace-
ment for crystal-oscillator modules, crystals, or ceramic
resonators and a system reset IC. The high-speed clock
frequency and reset threshold voltage are factory
trimmed to specific values (see Table 1). A variety of
popular standard frequencies are available. The low-
speed clock frequency is fixed at 32.768kHz; see Table
2. No external components are required for setting or
adjusting the frequency.
Oscillator
The push-pull clock output drives a load to within
400mV of either supply rail. The clock output remains
stable over the full operating voltage range and does
not generate short output cycles during either power-on
or changing of the frequency. A typical oscillating start-
up is shown in the
Typical Operating Characteristics
.
Clock-Speed Selection
Drive SPEED low to select slow clock speed (nominally
32.768kHz) or high to select full clock speed. SPEED can
be connected to V
CC
or to GND to select fast or slow
clock speed, or connected to a logic output (such as a μP
GPIO port) used to change clock speed on the fly. If
SPEED is connected to a μP GPIO port, connect a pullup
or pulldown resistor to set the clock to the preferred
speed on power-up. SPEED input bias current is 2μA
(max), so a resistor value as high as 500k
can be used.
Applications Information
Interfacing to a Microcontroller
Clock Input
The MAX7384 clock output is a push-pull, CMOS, logic
output that directly drives a μP or μC clock input. There
are no impedance-matching issues when using the
MAX7384. Refer to the microcontroller data sheet for
clock input compatibility with external clock signals.
The MAX7384 requires no biasing components or load
capacitance. When using the MAX7384 to retrofit a
crystal oscillator, remove all biasing components from
the oscillator input.
Reset Output
The MAX7384 is available with three reset output stage
options: push-pull active low, push-pull active high, and
open-drain active low. RST is asserted when the moni-
tored input (V
CC
) drops below the internal V
TH-
threshold
and remains asserted for 120μs after the monitored input
exceeds the internal V
TH+
threshold. The open-drain
RST output requires an external pullup resistor.
Output Jitter
The MAX7384’s jitter performance is given in the
Electrical Characteristics
table as a peak-to-peak value
obtained by observing the output of the MAX7384 for
Silicon Oscillator with Low-Power Frequency
Switching and Reset Output
6
_______________________________________________________________________________________
MAX7384
RST
CLOCK
10MHz TO 16MHz
(HF OSCILLATOR)
POR
V
CC
2.7V TO 5.5V
GND
32kHz
(LF OSCILLATOR)
V
L
MUX
LOGIC
SPEED
Figure 1. Functional Diagram
Pin Description
PIN
1
2
NAME
V
CC
V
L
FUNCTION
Positive Supply Voltage. Bypass V
CC
to GND with a 0.1μF capacitor.
Output Supply Voltage. Bypass V
L
to GND with a 0.1μF capacitor. V
L
must be connected to V
CC
.
3
SPEED
Clock-Speed Select Input. Drive SPEED low to select the 32kHz fixed frequency. Drive SPEED high
to select factory-trimmed frequency.
4
5
6
7
8
RST
CLOCK
GND
E.C.
N.C.
Reset Output. Open-drain or push-pull output. See the
Ordering Information.
Push-Pull Clock Output
Ground
Externally Connected. Connect to Vcc.
No Connection. Not internally connected.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX7384B | Replaced by SN54197 : 50/30/100-Mhz Presettable Decade OR Binary Counters/Latches 14-CDIP -55 to 125 |
| MAX7384C | Replaced by SN54197 : 50/30/100-Mhz Presettable Decade OR Binary Counters/Latches 14-CFP -55 to 125 |
| MAX738ACPA | Replaced by SN54197 : 50/30/100-Mhz Presettable Decade OR Binary Counters/Latches 14-CDIP -55 to 125 |
| MAX730 | 5V, Step-Down, Current-Mode PWM DC-DC Converters |
| MAX738A | 5V, Step-Down, Current-Mode PWM DC-DC Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7384B | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Silicon Oscillator with Low-Power Frequency Switching and Reset Output |
| MAX7384C | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Silicon Oscillator with Low-Power Frequency Switching and Reset Output |
| MAX7384CMUK-T | 制造商:Maxim Integrated Products 功能描述:SILICON OSCILLATOR W. LOW-PWR FREQUENCY SWITC - Tape and Reel |
| MAX7384CMUT | 功能描述:時鐘發(fā)生器及支持產(chǎn)品 RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MAX7384CMUT-T | 制造商:Maxim Integrated Products 功能描述:SILICON OSCILLATOR W. LOW-PWR FREQUENCY SWITC - Tape and Reel |
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