MAXIM MAX7376 User Manual

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General Description

The MAX7376 silicon oscillator with reset, is a replace­ment for ceramic resonators, crystals, crystal oscillator
modules, and discrete reset circuits. The MAX7376 pro­vides the primary clock source and reset function for
microcontrollers in 3V, 3.3V, and 5V applications. The
MAX7376 features a factory-programmed high-speed
oscillator and a microprocessor (µP) power-on-reset
(POR) supervisor.

Unlike typical crystal and ceramic resonator oscillator
circuits, the MAX7376 is resistant to vibration and EMI.
The high-output-drive current and absence of high­impedance nodes make the oscillator less susceptible
to dirty or humid operating conditions. With a wide
operating temperature range as standard, the MAX7376
is a good choice for demanding home appliance,
industrial, and automotive environments.

The MAX7376 is available in factory-programmed fre­quencies from 32.768kHz to 10MHz. See Table 2 for
standard frequencies and contact the factory for cus­tom frequencies.

The MAX7376 is available in a 5-pin SOT23 package.
Refer to the MAX7382 data sheet for frequencies
≥10MHz. The MAX7376 standard operating tempera­ture range is -40°C to +125°C. See the Applications
Information section for the extended operating temper­ature range.

Applications

White Goods
Automotive
Consumer Products
Appliances and Controls
Handheld Products
Portable Equipment
Microcontroller (µC) Systems

Features

♦ 2.7V to 5.5V Operation
♦ Accurate Oscillator: 600kHz to 10MHz or 32kHz
♦ Reset Output Holds the µC in Reset for 100µs

After Clock Startup

♦ ±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 Operating Current (8MHz)
♦ 13µA Operating Current (32kHz)
♦ -40°C to +125°C Temperature Range

MAX7376

Silicon Oscillator with Reset Output

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

19-3475; Rev 0; 10/04

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.

Standard version is shown in bold.
The first letter after the part number designates the reset output
option. Insert the letter corresponding to the desired reset
threshold level from Table 1 in the next position. Insert the two­letter code from Table 2 in the remaining two positions for the
desired frequency range. See Table 3 for standard part numbers.

Typical Application Circuit appears at end of data sheet.

PART TEMP RANGE

M A X7 3 7 6C _ _ _ - T -40°C to +125°C5 SOT23-5 Open drain

M AX7376A_ _ _- T -40°C to +125°C5 SOT23-5

M AX7376B_ _ _- T -40°C to +125°C5 SOT23-5

PIN­PACKAGE

RESET

OUTPUT

Active high

push-pull

Active low

push-pull

TOP VIEW

15E.C.CLOCK

MAX7376

2

GND

3

RST/RST

SOT23

4

V

CC

MAX7376

Silicon Oscillator with Reset Output

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 2.7V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 5V and TA = +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND .............................................................-0.3V to +6V

All Other Pins to GND ................................-0.3V to (V

CC

+ 0.3V)

CLOCK Current ................................................................±10mA

Continuous Power Dissipation (T

A

= +70°C)
5-Pin SOT23

(derate 7.1mW/°C above +70°C) ...................571mW (U5 - 2)

Operating Temperature Range.........................-40°C to +135°C

Junction Temperature .....................................................+150°C

Storage Temperature Range.............................-60°C to +150°C

Lead Temperature (soldering, 10s).................................+300°C

Operating Supply Voltage V

Operating Supply Current I

CLOCK OUTPUT

Minimum Operating Voltage 1.65 V

Output High Voltage V

Output Low Voltage V

Initial Frequency Accuracy f

Frequency Temperature
Sensitivity

Initial Frequency Accuracy
(32.768kHz)

Frequency Temperature
Sensitivity

CLOCK Output Duty Cycle 43 50 57 %

CLOCK Output Jitter

CLOCK Output Rise Time t
CLOCK Output Fall Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

f

= 8MHz, no load 3 5 mA

CC

CLOCK

f

= 32.768kHz, no load 13 25 µA

CLOCK

VCC = 4.5V, I

OH

VCC = 2.7V, I

VCC = 4.5V, I

OL

VCC = 2.7V, I

CLOCK

VCC = 5V, TA = +25°C (Note 2) -2 +2
VCC = 2.7V to 5.5V, TA = +25°C -4 +4

(Note 3) ±50 ±325 ppm/

f

CLOCK

VCC = 5V, TA = +25°C (Note 2) 32.440 32.768 33.096
VCC = 2.7V to 5.5V, TA = +25°C 31.785 33.751

32.768kHz (Note 3) ±50 ±325 ppm/

Observation of 8MHz output for 20s using a
500MHz oscilloscope

10% to 90% 5 ns

R

90% to 10% 5 ns

F

2.7 5.5 V

V

= 9mA

SOURCE

= 2.5mA

SOURCE

= 20mA 0.4

SINK

= 10mA 0.4

SINK

CC

- 0.4
V

CC

- 0.4

160 ps

V

V

%

kHz

o

C

o

C

-

MAX7376

Silicon Oscillator with Reset Output

_______________________________________________________________________________________ 3

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: The frequency is determined by part number selection. See Table 3.
Note 3: Guaranteed by design. Not production tested.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 2.7V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at VCC= 5V and TA = +25°C.) (Note 1)

Typical Operating Characteristics

(VCC= 5V, TA= +25°C, unless otherwise noted.)

RST/RST OUTPUT

Reset Threshold V

Reset Hysteresis V
POR Delay VCC rising from 0V to (VTH + 200mV) in 1µs 100 µs

Output High Voltage V

Output Low Voltage V

Leakage Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

TH+

THYS

OH

OL

LEAK

VCC rising

V

= {(V

HYST

TH+

VCC = 4.5V, I
VCC = 2.7V, I
VCC = 4.5V, I
VCC = 2.7V, I
VCC = 5.5V, V

-

V

TH

2%

TH

5%

-

TA = +25°C

T

= -40°C to +125°C

A

) - ( V

SOURCE
SOURCE
SINK
SINK

RST

)}/(V

TH-

) x 100% 2.0 %

TH-

= 9mA VCC - 0.4

= 2.5mA VCC - 0.4
= 20mA 0.4
= 10mA 0.4
= 5.5V, open drain 1 µA

VTH +

2%

VTH +

5%

V

V

V

DUTY CYCLE

vs. TEMPERATURE

55
54
53
52
51
50
49

DUTY CYCLE (%)

48
47
46
45

-55 -5 20 45 70-30 95 120

CLOCK = 4MHz

TEMPERATURE (°C)

MAX7376 toc01

DUTY CYCLE (%)

DUTY CYCLE

vs. SUPPLY VOLTAGE

55
54
53
52
51
50
49
48
47
46
45

4.3 4.6 4.9 5.2 5.5

CLOCK = 4MHz

SUPPLY VOLTAGE (V)

MAX7376 toc02

SUPPLY CURRENT (mA)

SUPPLY CURRENT

vs. TEMPERATURE

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

-55 -5 20 45 70-30 95 120

CLOCK = 4MHz

TEMPERATURE (°C)

MAX7376 toc03