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PAC001: DescriptionP/Active 1% Tolerance Dual Thevenin Termination Network; File Size47KB，2 Pages; ManufacturerCALMIRCO; Websitehttp://www.calmicro.com/

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P/Active 1% Tolerance Dual Thevenin Termination Network

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CALIFORNIA MICRO DEVICES

PACDT

P/Active 1% Tolerance Dual Thévenin Termination Network

Features

• Minimal ground bounce, crosstalk

• Stable 1% absolute tolerance elements

• 16 terminating lines per QSOP package

• Saves board space and reduces assembly cost

Applications

• HSTL termination

• Thévenin termination

• ECL, TTL termination

Product Description

High speed logic devices like HSTL (High Speed

Transceiver Logic) demand unique, high speed bus

terminations. The dual Thévenin termination network

provides 16 terminating channels per package, and

optimizes signal integrity by reducing reflections and

ringing. The terminations are available in a range of

standard values and are ideal for use in HSTL busses.

As seen in the schematic, R1 is typically tied to V

and

serves as a pull-up resistor, while R2 functions as a pull-

down resistor and is tied to ground (or the most negative

supply voltage). In addition, the equivalent Thévenin

resistance (R1 in parallel with R2) should match the

impedance of the trace. Ground-bounce and crosstalk

are virtually eliminated using a proprietary lead-frame

which includes four direct ground connections to the die

substrate, as well as four double-bonded connections to

, for a total of 8 commons. In addition, the resistors

are trimmed to a tight absolute tolerance of 1% which

provides tight impedance-matching and results in greatly

reduced reflections. This unique proprietary design

provides optimal signal integrity.

STANDARD VALUES

Absolute Tolerance (R1 & R2)

TCR

Operating Temperature Range

Power Rating/Resistor

Crosstalk (see Test Circuit)

Package

±1%

±100ppm

C to 70

100mW

30mV TYP

24 Pin QSOP

BUS IMPEDANCE (Ω)

R1(Ω)

100

112

136

R2 (Ω) CODE

100

112

136

001

002

003

004

SCHEMATIC CONFIGURATION

22 20

18 16

GND

STANDARD PART ORDERING INFORMATION

Package

R Code

001

002

003

004

Style

QSOP

Ordering Part Number

Tubes

PAC001DTFQ/T

PAC002DTFQ/T

PAC003DTFQ/T

PAC004DTFQ/T

Tape & Reel

PAC001DTFQ/R

PAC002DTFQ/R

PAC003DTFQ/R

PAC004DTFQ/R

Part Marking

PAC001DTFQ

PAC002DTFQ

PAC003DTFQ

PAC004DTFQ

C1611100

215 Topaz Street, Milpitas, California 95035

11/19/2000

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

PAC001 Related Products

	PAC001	PACDT	PAC004DTFQT	PAC004DTFQR	PAC003DTFQR	PAC003DTFQT	PAC002DTFQT	PAC001DTFQT	PAC002DTFQR	PAC001DTFQR
Description	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network	P/Active 1% Tolerance Dual Thevenin Termination Network

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