Low-Cost Fixed-Frequency EconOscillator™
Power-Down Mode
The PDN pin disables the internal oscillator and the
Pin Description
oscillator output for power-sensitive applications. The
power-down pin must remain low for at least two output
frequency cycles plus 10µs for deglitching purposes.
On power-up, the output is disabled until power is sta-
ble and the voltage-controlled oscillator has generated
512 clock cycles.
PIN
1
NAME
FUNCTION
Oscillator Output
OUT
2
V
V
Power Supply
Power Supply
Ground
CC
CC
3
4
GND
GND
5
Ground
Applications Information
Power-Down. When the pin is high, the
oscillator is enabled. When the pin is
low, the oscillator is disabled
(power-down mode).
Power-Supply Decoupling
To achieve the best results when using the DS1088L,
the power supply must be decoupled with 0.01µF and
0.1µF high-quality, ceramic, surface-mount capacitors.
Surface-mount components minimize lead inductance,
which improves performance, and tend to have ade-
quate high-frequency response for decoupling applica-
tions. These capacitors should be placed as close to
6
PDN
Do Not Connect. The DNC pins are
internally connected to ground.
7
8
DNC
DNC
Do Not Connect
the V
and GND pins as possible.
CC
Detailed Description
Chip Topology
The DS1088L is a low-cost clock generator that pro-
duces a square-wave output without external timing
components. The fixed-frequency oscillator is available
in factory-calibrated frequencies from 312kHz to
133MHz. The DS1088L has a power-down pin for
power-sensitive applications. A block diagram of the
DS1088L is shown in Figure 1.
TRANSISTOR COUNT: 4507
SUBSTRATE CONNECTED TO GROUND.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
Output Frequency
The internal oscillator frequency is divided by the facto-
ry-programmed prescaler to produce an output fre-
quency of 312kHz to 133MHz. See the Standard
Frequency Options table for a list of standard frequen-
cies. Contact factory for custom frequencies.
V
CC
V
CC
VOLTAGE-
CONTROLLED
OSCILLATOR
OUT
EEPROM
CONTROL
PRESCALER
BY 1, 2, 4...256
80MHz TO 160MHz
(312kHz
PDN
GND
TO 133MHz)
DS1088L
Figure 1. Block Diagram
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.
DALLAS [ DALLAS SEMICONDUCTOR ]
