DS1075M-80 datasheet, PDF - EEWORLD Datasheet

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DS1075M-80: DescriptionEconOscillator/Divider; CategoryThe embedded processor and controller Microcontrollers and processors; File Size252KB，18 Pages; ManufacturerDALLAS; Websitehttp://www.dalsemi.com

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DS1075M-80 Overview

EconOscillator/Divider

DS1075M-80 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	DALLAS
package instruction	0.300 INCH, DIP-8
Reach Compliance Code	unknown
JESD-30 code	R-PDIP-T8
JESD-609 code	e0
Number of terminals	8
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output clock frequency	80 MHz
Package body material	PLASTIC/EPOXY
Package shape	RECTANGULAR
Package form	IN-LINE
Master clock/crystal nominal frequency	50 MHz
Certification status	Not Qualified
Maximum supply voltage	5.25 V
Minimum supply voltage	4.75 V
Nominal supply voltage	5 V
surface mount	NO
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	THROUGH-HOLE
Terminal location	DUAL
uPs/uCs/peripheral integrated circuit type	CLOCK GENERATOR, OTHER
Base Number Matches	1

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DS1075

EconOscillator/Divider

www.maxim-ic.com.com

FEATURES

Dual Fixed frequency outputs

(30 KHz - 100 MHz)

User-programmable on-chip dividers

(from 1 - 513)

User-programmable on-chip prescaler

(1, 2, 4)

No external components

±0.5%

Initial tolerance

±1%

variation over temperature and voltage

Internal clock, External clock or crystal

reference options

Single 5V supply

Power-down mode

Synchronous output gating

PIN ASSIGNMENT

I/O

OUT0

GND

OSCIN

XTAL

PDN/SELX

DS1075Z 150-MIL SOIC

DS1075M 300-MIL DIP

FREQUENCY OPTIONS

Part No.

DS1075-100

DS1075-80

DS1075-66

DS1075-60

Max O/P freq.

100.000 MHz

80.000 MHz

66.667 MHz

60.000 MHz

DESCRIPTION

The DS1075 is a fixed frequency oscillator requiring no external components for operation. Numerous

operating frequencies are possible in the range of approximately 30 KHz to 100 MHz through the use of

an on-chip programmable prescaler and divider.

The DS1075 features a master oscillator followed by a prescaler and then a programmable divider. The

prescaler and programmable divider are user-programmable with the desired values being stored in

nonvolatile memory. This allows the user to buy an off the shelf component and program it on site prior

to board production. Design changes can be readily accommodated by programming, or reprogramming,

the desired values into the on-chip nonvolatile registers. Evaluation boards, DS1075K and DS1070K are

available to simplify this task.

The DS1075 is shipped from the factory configured for half the maximum operating frequency. Contact

the factory for specially programmed devices. As alternatives to the on-board oscillator an external clock

signal or a crystal may be used as a reference. The choice of reference source (internal or external) is

user-selectable at the time of programming (or on the fly if the SEL mode is chosen).

The DS1075 features a dual-purpose Input/Output pin. If the device is powered up in Program mode this

pin can be used to input serial data to the on-chip registers. After a Write command this data is stored in

nonvolatile memory. When the chip is subsequently powered up in operating mode these values are

automatically restored to the on-chip registers and the Input/Output pin becomes the oscillator output.

The DS1075 is available in 8-pin DIP or SOIC packages, allowing the generation of a clock signal easily,

economically and using minimal board area.

1 of 18

100899

DS1075

PIN DESCRIPTIONS

Input/Output Pin (IN/OUT): This pin is the main oscillator output, with a frequency determined by clock

reference, M and N dividers. Except in programming mode this pin is always an output and will be

referred to as “OUT”. In programming mode this pin will be referred to as “IN”.

External Oscillator Input (OSCIN):

This pin can be used to supply an external reference frequency to

the device.

Crystal Oscillator Connection (XTAL):

A crystal can be connected between this pin and OSCIN to

provide an alternative frequency reference. If a crystal is not used this pin should be left open.

Output Enable Function (OE pin):

The DS1075 also features a “synchronous” output enable. When

OE is at a high logic level the oscillator free runs. When this pin is taken low OUT is held low,

immediately if OUT is already low, or at it’s next high-to-low transition if OUT is high. This prevents

any possible truncation of the output pulse width when the enable is used. While the output is disabled

the master oscillator continues to run (producing an output at OUT0, if the

EN0

bit = 0) but the internal

counters (/N) are reset. This results in a constant phase relationship between OE’s return to a high level

and the resulting OUT signal. When the enable is released OUT will make its first transition within one

to two clock periods of the master clock.

Power-Down/Select Function (

PDN

SELX

PDN/SELX pin):

The Power-Down/Select (

PDN

SELX

) pin

has a user-selectable function determined by one bit (

PDN

bit) of the user-programmable memory.

According to which function is selected, this pin will be referred to as

PDN

SELX

If the Power-Down function is selected (PDN bit = 1) a low logic level on this pin can be used to make

the device stop oscillating (active low) and go into a reduced power consumption state. The “Enabling

Sequencer” circuitry will first disable OUT in the same way as when OE is used. Next OUT0 will be

disabled in a similar fashion. Finally the oscillator circuitry will be disabled. In this mode both outputs

will go into a high impedance state. The power consumption in the power-down state is much less than if

OE is used because the internal oscillator (if used) is completely powered down. Even if an external

reference or a crystal is used all of the on-chip buffers are powered down to minimize current drain.

Consequently the device will take considerably longer to recover (i.e., achieve stable oscillation) from a

power-down condition than if the OE is used.

If the Select function is chosen (PDN bit = 0) this pin can be used to switch between the internal

oscillator and an external reference (or crystal) on the fly. When this mode is chosen the E/

select bit is

overridden, a high logic level on

SELX

will select the internal oscillator, a low logic level will select the

external reference (or crystal oscillator).

Reference Output (OUT0 pin):

A reference output, OUT0, is also available from the output of the

reference select mux. This output is especially useful as a buffered output of a crystal defined master

frequency. OUT0 is unaffected by the OE pin, but is disabled in a glitchless fashion if the device is

powered down. If this output is not required it can be permanently disabled by setting the

EN0

bit to one,

and there will be a corresponding reduction in overall power consumption.

USER-PROGRAMMABLE REGISTERS

The following registers can be programmed by the user to determine operating frequency and mode of

operation. Details of how these registers are programmed can be found in a later section, in this section

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