IDTQS3389Q IDT, Integrated Device Technology Inc, IDTQS3389Q Datasheet

IDTQS3389Q

Manufacturer Part Number

IDTQS3389Q

Description

Manufacturer

IDT, Integrated Device Technology Inc

Datasheet

1.IDTQS3389Q.pdf (5 pages)

Specifications of IDTQS3389Q

Package Type

QSOP

Rad Hardened

Lead Free Status / Rohs Status

Not Compliant

Current page: 1 of 5
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FUNCTIONAL BLOCK DIAGRAM

FEATURES:

• Active termination pulls bus pins to rails

• Holds last value of input signal

• Ideal replacement for resistive termination

• Ultra low 3μ μ μ μ μ A DC quiescent current

• Bus-hold eliminates floating bus lines and reduces static

• Low power QCMOS technology

• Operates over 2.7V to 5.5V Vcc range

• TTL-compatible input and output levels

• No added noise or ground bounce

• 20 independent terminator circuits

• Available in QSOP package

APPLICATIONS:

• Bus termination

• Extend data hold time

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

COMMERCIAL TEMPERATURE RANGE

IDTQS3389

LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD)

power consumption

1999 Integrated Device Technology, Inc.

QUICKSWITCH

LAST VALUE LATCH

20 ACTIVE BUS TERMINATORS

(BUS HOLD)

PRODUCTS

DESCRIPTION:

bus signals to the voltage rails. This feature prevents bus signals from floating

in the threshold region of standard TTL I/O devices. The QS3389 can

replace resistor termination solutions which add DC power dissipation and

increase component count. Input clamp diodes help to reduce reflections

and undershoot in transmission line environments. Importantly, the termi-

nator circuits pull signals to whichever logic state the signal previously held

(high or low). For this reason, this device is also referred to as a last value

latch. This device is appropriate for data bus applications where interfacing

devices have CMOS inputs with low input currents. These terminators

provide sufficient drive to overcome leakage currents and drive corre-

sponding signals away from the TTL threshold region.

The QS3389 provides a set of 20 active termination circuits which pull data

The QS3389 is characterized for operation at 0°C to +70°C.

COMMERCIAL TEMPERATURE RANGE

DECEMBER 1999

IDTQS3389

DSC-5733/2

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IDTQS3389Q Summary of contents

Page 1

IDTQS3389 LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD) FEATURES: • Active termination pulls bus pins to rails • Holds last value of input signal • Ideal replacement for resistive termination • Ultra low 3μ μ μ μ μ A ...

Page 2

IDTQS3389 LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD) PIN CONFIGURATION ...

Page 3

IDTQS3389 LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD) DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE Following Conditions Apply Unless Otherwise Specified: Commercial 0°C to +70° ± Symbol Parameter V Input HIGH Voltage ...

Page 4

IDTQS3389 LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD) ACTIVE TERMINATOR OR ‘BUS-HOLD’ CIRCUIT The Active Terminator circuit, also known as the Bus-hold circuit, is configured as a “weak latch” with positive feedback. When connected to a TTL or CMOS ...

Page 5

IDTQS3389 LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD) ORDERING INFORMATION IDTQS XX XXXXX Package Device Type CORPORATE HEADQUARTERS 6024 Silver Creek Valley Road San Jose, CA 95138 X Process Blank Q 3389 for SALES: 800-345-7015 or 408-284-8200 fax: 408-284-2775 ...

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