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Obsolescence Notice
This product is obsolete. This information is available for your convenience only. For more information on Zarlink's obsolete products and replacement product lists, please visit
http://products.zarlink.com/obsolete_products/
JANUARY 1993
ADVANCE PRODUCT INFORMATION
DS3744 - 1.1
ZN705E
CRYSTAL CONTROLLED OSCILLATOR CIRCUIT
The ZN705E is a square wave oscillator designed to be used with AT cut crystals which have a low effective series resistance. A master oscillator feeds a two stage divider giving f/2 and f/4 outputs. Complementary outputs are also provided.
NC NC NC
1 2 3 4 5 6 7
14 13 12 11 10 9 8
V
CC
f/4 OUT f/4 OUT NC f/2 OUT f/2 OUT NC
FEATURES
s s s s s s s Operate upto 10MHz Low crystal drive required, suitable for AT cut types f/2, f/4 and antiphase outputs TTL compatible Single 5V supply 14 pin moulded plastic Replaces SP705/B/DG
COMPENSATION XTAL XTAL GND
DP14
Fig.1 Pinout
14 VCC Q DIVIDER FIRST STAGE Q TOTEM O/P 10 f/2 TOTEM O/P 9 f/2
OSCILLATOR
fHz Q DIVIDER SECOND STAGE Q TOTEM O/P 13 f/4 TOTEM O/P 12 f/4
56 CRYSTAL
0V
7
Fig.2 System diagram
ZN705E
ZN705E
ABSOLUTE MAXIMUM RATINGS (see note 1)
Supply voltage, VCC Operating supply range Input voltage, VIN (see note 2) Current sink Operating temperature range Storage temperature range 7.0V 5.0 0.25V -0.3 to 7.0V 16mA 0C to +70C -55C to +150C
DC CHARACTERISTICS
These characteristics are guaranteed over the following conditions unless otherwise stated. Parameter Supply current Low level output voltage High level output voltage Symbol ICC VOL VOH 9, 10, 12, 13 Pins Min. Typ. Max. Units. Conditions 35 0.4 mA V VCC = 5.0V VCC = 5.25V, IOL = 8mA see Fig.3
9, 10, 12, 13
2.6
V
VCC = 4.75V, IOH = 0.2mA see Fig.3
AC CHARACTERISTICS
These characteristics are guaranteed over the following conditions unless otherwise stated. Parameter Crystal frequency Output rise time Output fall time Note.1 Symbol fC tR tF Pins 5, 6 9, 10, 12, 13 9, 10, 12, 13 Min. Typ. Max. Units. Conditions 10 20 20 MHz ns ns VCC = 5.0V, VCC = 5.0V, see Fig.3 see Fig.3
The absolute maximum ratings are limiting values above which operating life may be shortened or specific parameters degraded. VIN = voltage on any input relative to pin 7.
Note.2
Functional description (by pin number) 1, 2, 3, 8, 11 Not connected 4 Compensation External compensation point. A capacitor may be connected between this pin and VCC to prevent unwanted high frequency oscillations. A 14pF capacitor is included on-chip for compensation and this may be sufficient for most applications.
9
f/2 f/2 output TTL compatible totem pole output, frequency equal to half that of the crystal.
10 f/2 Inverse function of pin 9. 12 f/4 f/4 output TTL compatible totem pole output, frequency equal to one quarter that of the crystal. 13 f/4 Inverse function of pin 12. 14 VCC Positive supply connection.
5,6 Crystal The crystal is connected, in series, with a 20pF capacitor, between these pins. Small frequency changes may be made by exchanging the capacitor for a machanical trimmer. 7 Ground
2
ZN705E
VCC
5 20pF XTAL
14
2.7K 9, 10 12, 13 TO 10M /10pF SCOPE PROBE
ZN705
6 7
5pF
GND
Fig.3 Test circuit (All outputs)
90% VOUT 10% tR tF
90%
10%
Fig.4
3
ZN705E
PACKAGE DETAILS
Dimensions are shown thus: mm (in).
1 14
5.08 (0.200) MAX
20.3 (0.80) MAX
0.51 (0.020) MIN 3.05 (0.120) MIN
0.23/0.41 0.38/0.61 (0.015/0.024) 14 LEADS AT 2.54 (0.10) SPACING 7.62 (0.3) CTRS NOM (0.009/0.016)
14-LEAD PLASTIC DIL - DP14
HEADQUARTERS OPERATIONS GEC PLESSEY SEMICONDUCTORS Cheney Manor, Swindon, Wiltshire SN2 2QW, United Kingdom. Tel: (0793) 518000 Tx: 449637 Fax: (0793) 518411 GEC PLESSEY SEMICONDUCTORS Sequoia Research Park, 1500 Green Hills Road, Scotts Valley, California 95066, United States of America. Tel (408) 438 2900 ITT Telex: 4940840 Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES * FRANCE & BENELUX Les Ulis Cedex Tel: (1) 64 46 23 45 Tx: 602858F Fax : (1) 64 46 06 07 * GERMANY Munich Tel: (089) 3609 06-0 Tx: 523980 Fax : (089) 3609 06-55 * ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993 * JAPAN Tokyo Tel: (03) 3296-0281 Fax: (03) 3296-0228 * NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA Tel (408) 438 2900 ITT Tx: 4940840 Fax: (408) 438 7023. Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061. * SOUTH EAST ASIA Singapore Tel: (65) 3827708 Fax: (65) 3828872 * SWEDEN Stockholm, Tel: 46 8 702 97 70 Fax: 46 8 640 47 36 * UNITED KINGDOM & SCANDINAVIA Swindon Tel: (0793) 518510 Tx: 444410 Fax : (0793) 518582 These are supported by Agents and Distributors in major countries world-wide. (c) GEC Plessey Semiconductors 1993 Publication No. DS3744 Issue No. 1.1 January 1993
This publication is issued to provide information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. The Company reserves the right to alter without prior knowledge the specification, design or price of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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