DS1088L Datasheet, PDF (5/5 Pages) Dallas Semiconductor – Low-Cost Fixed-Frequency EconOscillator

Low-Cost Fixed-Frequency EconOscillator™
Pin Description
PIN
NAME
FUNCTION
1
OUT Oscillator Output
2
V_CC Power Supply
3
V_CC Power Supply
4
GND Ground
5
GND Ground
Power-Down. When the pin is high, the
6
PDN ^{oscillator is enabled. When the pin is}
low, the oscillator is disabled
(power-down mode).
7
DNC ^{Do Not Connect. The DNC pins are}
internally connected to ground.
8
DNC Do Not Connect
Detailed Description
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.
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.
Power-Down Mode
The PDN pin disables the internal oscillator and the
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.
Applications Information
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
the V_CC and GND pins as possible.
Chip Topology
TRANSISTOR COUNT: 4507
SUBSTRATE CONNECTED TO GROUND.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/DallasPackInfo.
V_CC
V_CC
VOLTAGE-
EEPROM
CONTROLLED
CONTROL
OSCILLATOR
PDN
80MHz TO 160MHz
GND
PRESCALER
BY 1, 2, 4...256
DS1088L
Figure 1. Block Diagram
OUT
(312kHz
TO 133MHz)
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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is a registered trademark of Maxim Integrated Products, Inc.
is a registered trademark of Dallas Semiconductor Corporation.