Datasheet > PACDT

PACDT

更新时间： 2022-12-09 07:18:12

品牌	Logo	应用领域
CALMIRCO		/
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2页	52K
描述
P/Active 1% Tolerance Dual Thevenin Termination Network

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PACDT 数据手册

CALIFORNIA MICRO DEVICES

PACDT

P/Active 1%Tolerance DualThéveninTermination Network

Features

Applications

•

Minimal ground bounce, crosstalk

•

HSTL termination

• Thévenin termination

ECL, TTL termination

Stable 1% absolute tolerance elements

16 terminating lines per QSOP package

Saves board space and reduces assembly cost

•

Product Description

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

V_CC, 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.

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_CCand

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

BUS IMPEDANCE (Ω) R1(Ω) R2 (Ω) CODE

STANDARD VALUES

001

002

003

004

Absolute Tolerance (R1 & R2)

100

112

136

100

112

136

TCR

100ppm

0 C to 70 C

Operating Temperature Range

Power Rating/Resistor

Crosstalk (see Test Circuit)

Package

100mW

30mV TYP

24 Pin QSOP

SCHEMATIC CONFIGURATION

22 20

18 16

V_CC

GND

STANDARD PART ORDERING INFORMATION

Package

Ordering Part Number

R Code

001

Style

QSOP

Tubes

Tape & Reel

Part Marking

PAC001DTFQ

PAC002DTFQ

PAC003DTFQ

PAC004DTFQ

PAC001DTFQ/T

PAC002DTFQ/T

PAC003DTFQ/T

PAC004DTFQ/T

PAC001DTFQ/R

PAC002DTFQ/R

PAC003DTFQ/R

PAC004DTFQ/R

002

003

004

C1611100

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

11/19/2000

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