EM7604 Datasheet, PDF (1/4 Pages) EM Microelectronic - MARIN SA – Low Power Crystal Oscillator 32.768 kHz

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EM MICROELECTRONIC - MARIN SA
EM7604
Low Power Crystal Oscillator 32.768 kHz
Description
The EM7604 is an advanced low power CMOS circuit
intended to be used together with a 32.768 kHz tuning fork
crystal as a low frequency clock oscillator.
Except the crystal, no other external components are
required.
In order to achieve a high frequency accuracy, the matched
crystals should have a ± 20ppm tolerance or tighter.
Very low power consumption, as low as 250nA, is
guaranteed over a very wide supply voltage and
temperature ranges.
Offered in a small SOT23-6 package, the EM7604 is a
completely lead free product.
Applications
ƒ General purpose clock generator for digital systems
ƒ Clock drivers for Real Time Clocks
ƒ Timekeeping in network servers and computers
ƒ Electricity, gas and water metering
ƒ Portable field communication
ƒ Mobile phone
ƒ Solution for problems with embedded quartz oscillators
Pin Assignment
Pin Connection Assignment
1 OSCOUT Oscillator Output
2 VSS
Negative Supply
Voltage
3 OSCIN
Oscillator Input
4 OE
5 VDD
6 OUT
Output Enable
Positive Supply
Voltage
Frequency Output
Features
ƒ Very low power consumption: typ. 250nA
ƒ On chip integrated oscillation capacitor: C_L=8pF
ƒ Matched low cost SMD quartz available from Micro Crystal
ƒ Compatibility with crystals having high series resistance
ƒ Very tight frequency tolerance
ƒ Excellent oscillator stability: 0.2ppm/V
ƒ Wide supply voltage range: 1.2V to 5.5V
ƒ Operating temperature range: -40°C to +125°C
ƒ Small SOT23-6 package
ƒ 100% lead free, RoHS – compliant
Block Diagram
VDD
REGULATION
OSCILLATOR
OE
OUTPUT
CONTROL
OUT
VSS
SOT23
OSCOUT 1
6 _OUT
VSS 2 _EM7604 5 VDD
OSCIN 3
4 _OE
Copyright © 2006, EM Microelectronic-Marin SA
1
03/06 – rev.A
www.emmicroelectronic.com