Zetex TRAC-S2Q16 Datasheet

TRAC® SUPPORT CIRCUIT

ISSUE 1 - JANUARY 2000

DEVICE DESCRIPTION

The TRAC family of Field Programmable Analog Devices offers an integrated path from signal processing problems to working silicon solutions - in minutes! The Totally Reconfigurable Analog Circuit is a highly flexible single chip solution to the signal processing problems found in many markets.

Introducing a Top-Down, Structured design discipline, TRAC enables rapid implementation, prototyping and product release. Rather than working at the component level, TRAC champions the Computational Approach, providing designers with benefits formerly associated only with programmable digital devices. TRAC brings a truly integrated Signal Processing problem solving process, offering a path to Custom Silicon for higher volume users.

TRAC devices have to be loaded with program data at power-up and run from a split 5V supply. By integrating the loading interface circuitry, voltage regulation, supply monitoring and thermal protection, the TRAC support circuit (TRAC-S2) further simplifies circuit integration and interface with memory devices.

An adjustable frequency oscillator clocks program data out of a serial output memory device and into any number of cascaded TRAC devices. By monitoring the bit stream pattern, TRAC-S2 can sense when loading is complete and stop clocking automatically.

An adjustable ‘rail-splitter’ generates the ground supply rail, and the supply monitoring function initiates program load on power-up, and after power failure or serious fluctuation. Thermal shutdown further protects the device against overheating.

TRAC-S2

FEATURES & BENEFITS

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Makes designing TRAC circuits easier, production prototyping quicker

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Reduces component count and manufacturing costs

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Enables simple connection of a serial output EEPROM or other memory device to TRAC

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Compatible with current and future TRAC devices

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Automatic program loading at power-up

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Supply monitor function reloads program after power failure or fluctuation

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Frequency of on-chip oscillator user-defined

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Senses number of cascaded TRAC devices automatically

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Automatically stops clocking when program loading complete

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Simplifies generation of TRAC supply voltages

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Ground voltage user defined

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Thermal shutdown function protects against overloading due to circuit failures

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Full industrial temperature range

ORDERING INFORMATION

PART NUMBER PACKAGE PART

TRAC-S2Q16 QSOP16 TRAC-S2

MARK

TRAC-S2

ABSOLUTE MAXIMUM RATINGS

Supply Voltage 0V to +7V Supply Current 50mA Operating Temperature Range -40°C to 85°C Storage Temperature Range -55°C to 125°C

ELECTRICAL CHARACTERISTICS Test Conditions: Temperature=25°C, V 100nF between AGND_OUT and V

PARAMETER CONDITIONS MIN TYPICAL MAX

Supply Voltage Operating Range 4.8V 5.0V 5.2V

Supply Current Standby (CLCR_IN = 0V)

RAIL SPLITTER

SETV(Input Current) SETV = 2.50V 50nA 200nA

AGND_OUT (Output Voltage)

SUPPLY MONITOR

RESET_OUT (Threshold Voltage)

RESET_OUT (Hysteresis) 0.01V 0.02V 0.08V

RESET_OUT (Onstate output sink current)

RESET_OUT (Offstate output current)

PROPAGATION DELAY VDD step from 5.0V to 4.0V

PROGRAMMING LOGIC

CLK_OUT (Frequency)

CLK_OUT (Max Programming Frequency)

CLK_OUT (High output voltage)

NOT CLK_OUT(Frequency) 2.2nF between CAP and V

NOT CLK_OUT(High output voltage)

Clocking (CLCR_IN = 5V)

SETV = 2.50V (No Load) SETV = 2.0V (No Load)

SETV = 2.50V; I

High State Output (VDD increasing) Low State Output (VDD decreasing)

VDD = RESET_OUT = 4V 0.14mA

VDD = RESET_OUT = 5V 0.18mA

2.2nF between CAP and V CLCR_IN = 5V

47pF between CAP and V CLCR_IN = 5V

2.2nF between CAP and V CLCR_IN = 5V

CLCR_IN = 5V

2.2nF between CAP and V CLCR_IN = 5V

=5V, VSS=0V, CLCR_IN=0V,

, unless otherwise stated.

1.5mA

2.9mA

2.49V

1.99V

= 20mA

SINK

= 2 0 mA AGND_OUT

SOURCE

- 0.010V

4.35V

7kHz 10kHz 15kHz

3.90V 4.10V 4.50V

7kHz 10kHz 15kHz

4.00V 4.20V 4.60V

1.9mA

3.7mA

2.50V

2.00V

4.67V

4.65V

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2.8mA

5.5mA

2.51V

2.01V

AGND_OUT + 0.010V

4.75V

200kHz

TRAC-S2

ELECTRICAL CHARACTERISTICS Test Conditions: Temperature=25°C, V 100nF between AGND_OUT and V

DATA_OUT(Frequency) 2.2nF between CAP and V

DATA_OUT(High output voltage)

SELECT (Output Voltage)

CLCR_IN = 5V

2.2nF between CAP and V CLCR_IN = 5V

DESCRIPTION OF PIN FUNCTIONS

Inputs SETV Defines the AGND_OUT voltage. Normally set by potential divider CLCR_IN Active high to enable clock CAP Capacitor to V

Outputs AGND_OUT Analog Ground. Able to source and sink current SELECT Active high when CLCR_IN is logic high. Enables memory device CLK_OUT Fed to EEPROM clock input NOT CLK_OUT Fed to TRAC clock input DATA_OUT CLK_OUT divided by four. Fed to serial output memory device RESET_OUT Reset for TRAC Support Circuit and TRAC devices

sets clock frequency

General notes for the TRAC Support Circuit

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An on-chip oscillator produces the output CLK_OUT and NOT CLK_OUT. CLCR_IN must be logic high (V

) to activate CLK_OUT and NOT CLK_OUT

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The CLK_OUT output frequency is divided by four to give the DATA_OUT output. Therefore CLCR_IN must be logic high (V

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For AGND_OUT stability under load, a 100nF capacitor is required between AGND_OUT and V

) to activate DATA_OUT

=5V, VSS=0V, CLCR_IN=0V,

, unless otherwise stated.

1.7kHz 2.5kHz 4.0kHz

3.90V 4.10V 4.50V

4.8V 4.99V 5.00V

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