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PDF MAX7377 Data sheet ( Hoja de datos )
| Número de pieza | MAX7377 | |
| Descripción | Silicon Oscillator with Low-Power Frequency Switching | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3474; Rev 0; 10/04
Silicon Oscillator with Low-Power
Frequency Switching
General Description
The MAX7377 dual-speed silicon oscillator with reset is
a replacement for ceramic resonators, crystals, crystal
oscillator modules, and discrete reset circuits. The
device provides the primary and secondary clock
source for microcontrollers in 3V, 3.3V, and 5V applica-
tions. The MAX7377 features a factory-programmed
high-speed oscillator, a 32.768kHz oscillator, and a
clock selector input. The clock output can be switched
at any time between the high-speed clock and the
32.768kHz clock for low-power operation. Switchover is
synchronized internally to provide glitch-free clock
switching.
Unlike typical crystal and ceramic resonator oscillator
circuits, the MAX7377 is resistant to vibration and EMI.
The high-output-drive current and absence of high-
impedance nodes make the oscillator less susceptible
to dirty or humid operating conditions. With a wide
operating temperature range as standard, the MAX7377
is a good choice for demanding home appliance,
industrial, and automotive environments.
The MAX7377 is available in factory-programmed fre-
quencies from 32.768kHz to 10MHz. See Table 1 for
standard frequencies and contact the factory for cus-
tom frequencies.
The MAX7377 is available in a 5-pin SOT23 package.
Refer to the MAX7383 data sheet for frequencies
≥10MHz. The MAX7377 standard operating tempera-
ture range is -40°C to +125°C. See the Applications
Information section for the extended operating temper-
ature range.
Features
♦ 2.7V to 5.5V Operation
♦ Accurate High-Speed 600kHz to 10MHz Oscillator
♦ Accurate Low-Speed 32kHz Oscillator
♦ Glitch-Free Switch Between High Speed and Low
Speed at Any Time
♦ ±10mA Clock-Output Drive Capability
♦ 2% Initial Accuracy
♦ ±50ppm/°C Temperature Coefficient
♦ 50% Duty Cycle
♦ 5ns Output Rise and Fall Time
♦ Low Jitter: 160ps(P-P) at 8MHz (No PLL)
♦ 3mA Fast-Mode Operating Current (8MHz)
♦ 13µA Slow-Mode Operating Current (32kHz)
♦ -40°C to +125°C Temperature Range
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX7377AX_ _-T
-40°C to +125°C 5 SOT23-5
The first two letters are AX. See Table 1 at the end of the data
sheet for the two-letter code.
Applications
White Goods
Handheld Products
Automotive
Portable Equipment
Consumer Products
Microcontroller Systems
Appliances and Controls
TOP VIEW
Pin Configuration
CLOCK 1
5 E.C.
MAX7377
GND 2
Typical Application Circuit appears at end of data sheet.
SPEED 3
4 VCC
SOT23
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Silicon Oscillator with Low-Power
Frequency Switching
Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25°C, unless otherwise noted.)
FREQUENCY vs. SUPPLY VOLTAGE
4.10
CLOCK = 4MHz
4.08
4.06
4.04
4.02
4.00
3.98
3.96
3.94
3.92
3.90
4.3
4.6 4.9 5.2
SUPPLY VOLTAGE (V)
5.5
CLOCK OUTPUT WAVEFORM (CL = 10pF)
MAX7377 toc13
FREQUENCY vs. TEMPERATURE
33.0
CLOCK = 32kHz
32.9
32.8
32.7
32.6
32.5
32.4
32.3
32.2
32.1
32.0
-55 -30
-5 20 45 70 95
TEMPERATURE (°C)
120
CLOCK OUTPUT WAVEFORM (CL = 50pF)
MAX7377 toc14
FREQUENCY vs. TEMPERATURE
4.10
CLOCK = 4MHz
4.08
4.06
4.04
4.02
4.00
3.98
3.96
3.94
3.92
3.90
-55 -30 -5 20 45 70 95 120
TEMPERATURE (°C)
CLOCK OUTPUT WAVEFORM (CL = 100pF)
MAX7377 toc15
CLOCK
CLOCK
CLOCK
f = 4MHz, CL = 10pF
40ns/div
f = 4MHz, CL = 50pF
40ns/div
HIGH-SPEED TO LOW-SPEED
TRANSITION
MAX7377 toc16
f = 4MHz, CL = 100pF
40ns/div
HIGH-SPEED TO LOW-SPEED
TRANSITION (EXPANDED SCALE)
MAX7377 toc17
20µs/div
400ns/div
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX7377.PDF ] | |
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