CHT-CG-050 [ETC]

Versatile High Temperature Clock Generator; 多才多艺的高温时钟发生器


型号：	CHT-CG-050
厂家：	ETC
描述：	Versatile High Temperature Clock Generator 多才多艺的高温时钟发生器时钟发生器
文件：	总9页 (文件大小：114K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

CISSOID The SOI design Specialist

CHT-CG-050

Preliminary datasheet

Version 0.4 (08/2005)

Versatile High Temperature Clock Generator

General Description

Features

The CHT-CG-050 is a versatile High-

Temperature crystal clock generator with

extended functional capabilities. The chip

features a programmable crystal oscillator

driver with an enable/disable control sig-

nal, an external clock input, a programma-

ble divider chain and a programmable

strength three-state output buffer. Using

an external crystal, it is intended to provide

reliable precision performance throughout

the -30 to +225°C temperature range for

supply voltages between 3V and 5V.

•

3V to 5V power supply

Qualified from -30 to +225°C (T_j)

Operational up to +250°C (T_j)

Two input sources: crystal (1 to 50

MHz), external clock (DC to 50MHz)

Operation from 32.768kHz crystals

Programmable frequency divider: f_in,

f_in/2, f_in/4 and f_in/8

•

The CHT-CG-050 can operate with crys-

tals from 1MHz to 50MHz. The output fre-

quency can be selected by means of a

programmable divider, providing division

factors of one, two, four and eight. The

programmability of the crystal driver allows

working with a wide range of crystals. A

crystal driver enable pin (/XtalEn) is in-

cluded for extremely low power applica-

tions, as well as an output enable pin

(/OE). In applications requiring only a pre-

cision divider chain, where an external

clock source is already present, the crystal

driver may be bypassed by means of in-

puts ExtClkIn and ExtClkEn.

•

Programmable crystal driver and out-

put driver strength

Available in several standard pack-

ages or as die

Applications

•

Well logging, Automotive, Aeronautics

& Aerospace

•

Precision timing

ExtClkEn When driven HIGH, opera-

tion from the external clock

source is selected.

Pin Description

C1_10pF

C1_20pF

C2_10pF

C2_20pF

Built-in capacitors with a

common terminal connected

to Vss.

ExtClkIn

Input for an external clock

source.

DIV_0

DIV_1

Inputs to set the division

FOUT

/OE

Output signal.

factor.

TRUTH TABLE

DIV_1

DIV_0

Factor

When driven LOW, output is

enabled,

When

driven

HIGH, output is at high im-

pedance.

DRI_0

DRI_1

Inputs to set the output

buffer strength.

Terminal of a 200Ω resistor.

The other terminal of this

resistor is connected to X2.

TRUTH TABLE

DRI_1

DRI_0

Strength

8mA

16mA

24mA

32mA

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Output of crystal driver

Pin Description (Cnt'd)

Vdd

Circuit core power supply

terminal.

XtalDR_0 Inputs to set the crystal drive

XtalDR_1 strength.

TRUTH TABLE

Vdd_Buff Output buffer power supply

XtalDR_1

XtalDR_0

Strength

Lowest

Low

High

Highest

terminal.

Vss

Circuit core ground terminal.

/XtalEn

When driven LOW, the crys-

tal oscillator is enabled.

When driven HIGH, the

crystal oscillator is stopped.

Vss_Buff Output buffer ground termi-

nal.

Input of crystal driver

Internal architecture

Xtal driver

R1=2M

Programmable

divider

Programmable

output buffer

Clock

select

FOUT

R2=200

8/16/24/32 mA

1/2/4/8

Figure 1. CHT-CG-050: simplified blocks diagram.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Absolute Maximum Ratings

Operating Conditions

Supply Voltage V_DDto GND

Junction temperature

Supply Voltage V_DDto GND

Voltage on any Pin to GND

-0.5 to 6.0V

3.3V to 5V

-30°C to +225°C

-0.5 to V_DD+0.3V

ESD Rating (expected)

Human Body Model

Operation up to +250°C (T_j) can be obtained with little

increase of the current consumption.

1kV

Electrical Characteristics

Unless otherwise stated: V_DD=5V, T_j=25°C. Bold figures indicate values over the whole tem-

perature range (-30°C < T_j< +225°C).

Parameter

Condition

Min

Typ

Max

Units

Supply voltage

V_DD

3.13

5.5

V_DD= 3V, F_IN= 1.8MHz

Output disabled (/OE: HIGH)

0.141

V_DD= 3V, F_IN= 1.8MHz

Output enabled (/OE: LOW)

C_L= 22pF

0.374

0.405

V_DD= 3V, F_IN= 32MHz

Output disabled (/OE: HIGH)

0.800

V_DD= 3V, F_IN= 32MHz

Output enabled (/OE: LOW)

C_L= 22pF

5.08

5.15

V_DD= 5V, F_IN= 1.8MHz

Output disabled (/OE: HIGH)

1.01

Current consumption^a

Idd

V_DD= 5V, F_IN= 1.8MHz

Output enabled (/OE: LOW)

C_L= 22pF

1.40

1.44

V_DD= 5V, F_IN= 32MHz

Output disabled (/OE: HIGH)

1.84

V_DD= 5V, F_IN= 32MHz

Output enabled (/OE: LOW)

C_L= 22pF

8.97

9.08

V_DD= 5V, F_IN= 50MHz

Output disabled (/OE: HIGH)

2.49

_DD= 5V, F_IN= 50MHz

14.82

15.03

Output enabled (/OE: LOW)

C_L= 22pF

Minimum HIGH level output

voltage

V_OH

Maximum LOW level output

voltage

4.67

3.15

R_LOAD= 600Ω

0.30

1.35

V_OL

Minimum HIGH level input

voltage

V_IH

Maximum LOW level input

voltage

V_IL

Internal capacitors

Initial accuracy

Temperature depend-

ence

0.6

∆T = 200°C

TC1

TC2

0.023

0.013

10^-3/K

10^-6/K²

C(T) = C(T₀) [1+TC1.(T-T₀)+

TC2.(T-T₀)²]

The given value includes the consumption due to the load. Current consumption due to a capacitive load must be

computed according to I_LOAD= C_L.V_DD.f.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

AC Electrical Characteristics

Unless otherwise stated: V_DD=5V, T_j=25°C. Bold figures indicate values over the whole tem-

perature range (-30°C < T_j< +225°C).

Parameter

Condition

Min

Typ

Max

Units

Frequency range

F_IN

MHz

F_IN=1.8MHz, V_DD= 5V

48/52

45/55

Duty cycle @ 50% V_DD

DC^{b c}

F_IN=32MHz, V_DD= 5V

47/53

F_IN=50MHz, V_DD= 5V

Output rise time^d

10% to 90% V_DD

t_r

Output fall time^e

10% to 90% V_DD

t_f

3.0

2.5

2.1

Vdd = 5V, Z_LOAD= 1MΩ // 22pF

Vdd = 5V, Z_LOAD= 600Ω // 15pF

Vdd = 5V, Z_LOAD= 1MΩ // 22pF

Vdd = 5V, Z_LOAD= 600Ω // 15pF

Oscillation established after

Vdd goes high^f

t_power-on

1.2

3.2

V_DDfrom 0 to 5V

Oscillation established after

/XtalEn goes LOW^g

t_start-up

V_DD= 5V

/XtalEn from LOW to HIGH

0.6

1.4

^bDuty cycle is measured with a unitary division factor and Z_LOAD= 1050Ω // 22pF.

^cDepends on used crystal and R2 value.

^dDepends on load conditions and DRI_0, DRI_1 settings.

^eDepends on load conditions and DRI_0, DRI_1 settings.

Depends on used crystal and XtalDR_0, XtalDR_1 settings.

^gDepends on used crystal and XtalDR_0, XtalDR_1 settings.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Typical Performance Characteristics

1.8 MHz, /OE=LOW

10 MHz, /OE=LOW

20 MHz, /OE=LOW

32 MHz, /OE=LOW

50 MHz, /OE=LOW

1.8 MHz, /OE=LOW

32 MHz, /OE=LOW

100

150

200

225

235

100

150

200

225

235

Temperature (°C)

Current consumption, V_DD= 5V, /OE = LOW,

C_L= 22pF

Current consumption, V_DD= 3V, /OE = LOW,

C_L= 22pF

2.60

2.40

1.00

0.80

0.60

2.20

1.8 MHz, /OE=HIGH

32 MHz, /OE=HIGH

2.00

50 MHz, /OE=HIGH

1.80

1.60

1.40

1.20

1.00

0.80

1.8 MHz, /OE=HIGH

32 MHz, /OE=HIGH

0.40

0.20

0.00

100

150

200

225

235

100

150

200

225

235

Temperature (°C)

Current consumption, V_DD= 5V, /OE = HIGH

Current consumption, V_DD= 3V, /OE = HIGH

1.8 MHz

32 MHz

50 MHz

100

150

200

225

235

Temperature (°C)

Duty cycle, V_DD= 5V

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Circuit functionality

Operating conditions

The CHT-CG-050 has been qualified for

supply voltages ranging from 3V up to

5.5V. The upper limit is imposed by the

technology on which the CHT-CG-050 is

implemented.

The qualification temperature range ex-

tends from -30°C to +225°C, though func-

tionality is above +250°C is achieved with

little increase of the current consumption.

Crystal driver

Figure 2. Effect of DRI_0 and DRI_1 on the output

XtalDR_0 and XtalDR_1 allow the crystal

driver to change its strength to be able to

oscillate with a wide range of crystals, un-

der any supply (3V to 5V) and temperature

(up to 225°C) condition.

The presence of integrated passive com-

ponents offers a great versatility to the

final user. Highly temperature-stable ca-

pacitors allow for a nearly-constant crystal

load along the whole temperature range.

Internal passive components can be by-

passed or tied to ground if needed.

signal.

Figure 2 shows the superposition of the out-

put signal when DRI_0, DRI_1 = LOW and

DRI_1 is then set to HIGH, V_DD=3V,

T=235°C, Freq = 27MHz. As a result, the

signal integrity is improved.

Packaging options

As mentioned above, the layout of the

CHT-CG-050 allows for a very high level of

flexibility for the system designer. Several

packaging configurations are possible,

from 8-pin to 24-pin standard carriers.

At the packaging stage, many functional

features can be enabled or safely disabled

in order to optimize the form factor accord-

ing to the final user needs.

/XtalEn enables or disables the crystal

oscillator to operate, allowing the CHT-

CG-050 to be embedded into power-

optimized high-temperature applications.

Clock source selector

By means of ExtClkEn and ExtClkIn, the

CHT-CG-050 is able to operate either from

its internal crystal oscillator or from an ex-

ternal clock source.

Typical application

The CHT-CG-050 offers the final user

several possible configurations depending

upon the characteristics of the target ap-

plication.

Frequency divider

Four division factors (1, 2, 4 and 8) can be

selected depending on the levels at the

control lines DIV_0 and DIV_1.

Output buffer

A programmable-strength output buffer,

controlled by DRI_0 and DRI_1, enables

the CHT-CG-050 to drive a large range of

output loads, improving the output signal

integrity. The four possible output

strengths are 8mA, 16mA, 24mA and

32mA.

The output buffer has supply terminals

independent from the rest of the circuit,

allowing the system designer to properly

decouple them in noise-sensitive applica-

tion.

Figure 3. Full configuration.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Dashed lines in Figure 3 indicate optional

connections. Figure 4 shows the minimal

possible configuration with no external

components. Any configuration in between

those of Figure 3 and Figure 4 can be ob-

tained by properly bypassing or tying to

ground the corresponding internal compo-

nent.

Any programmable feature can be

changed on-the-fly, allowing the CHT-CG-

050 to accommodate to new operating

conditions in smart or adaptive applica-

tions.

Figure 4. Minimal configuration.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Possible Packaging Options

Figure 5. CHT-CG-050: possible packaging options.

NOTES:

The CHT-CG-050 can also be ordered as die.

Packaging options shown are only indicative. Other possibilities are also avail-

able.

Ask CISSOID for other packaging configurations.

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CHT-CG-050 - Preliminary datasheet - Version 0.4 (08/2005)

Contact & Ordering

CISSOID S.A.

Chemin du Cyclotron 6

1348 Louvain-la-Neuve

Belgium

Tel : +32-10-489210

Fax : +32-10-489219

sales@cissoid.com

http://www.cissoid.com

Disclaimer

Neither CISSOID, nor any of its directors, employees or affiliates make any representations or extend any warranties

of any kind, either express or implied, including but not limited to warranties of merchantability, fitness for a particular

purpose, and the absence of latent or other defects, whether or not discoverable. In no event shall CISSOID, its di-

rectors, employees and affiliates be liable for direct, indirect, special, incidental or consequential damages of any kind

arising out of the use of its circuits and their documentation, even if they have been advised of the possibility of such

a damage. The circuits are provided “as is”. CISSOID has no obligation to provide maintenance, support, updates, or

modifications.

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CHT-CG-050 [ETC]

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