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QS3257S1G8 - Renesas Electronics

Description: The QS3257 is a high-speed CMOS LVTTL-compatible Quad 2:1 multiplexer/demultiplexer. The QS3257 is a function and pinout compatible QuickSwitch version of the 74F257, 74FCT257, and the 74ALS/AS/LS257 Quad 2:1 multiplexers. The low ON resistance of the QS3257 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The QS3257 operates at -40C to +85C.

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QS3257S1G8 - Renesas Electronics - PCB symbol
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QS3257S1G8 - Renesas Electronics PCB footprint - Small Outline Packages - Small Outline Packages - dcg16
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QS3257S1G8 Details

  • Manufacturer Part Number:

    QS3257S1G8

  • Brand Name:

    Renesas

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Obsolete

  • Part Package Code:

    SOIC

  • Pin Count:

    16

  • Manufacturer Package Code:

    DCG16

  • HTS Code:

    8542.39.00.01

  • Factory Lead Time:

    4 Weeks

  • Manufacturer:

    Renesas Electronics Corporation

  • YTEOL:

    0

  • Control Type:

    ENABLE LOW

  • Count Direction:

    BIDIRECTIONAL

  • Family:

    QS3V

  • JESD-30 Code:

    R-PDSO-G16

  • JESD-609 Code:

    e3

  • Length:

    10.2 mm

  • Load Capacitance (CL):

    50 pF

  • Logic IC Type:

    BUS EXCHANGER

  • Moisture Sensitivity Level:

    3

  • Number of Bits:

    2

  • Number of Functions:

    4

  • Number of Ports:

    3

  • Number of Terminals:

    16

  • Operating Temperature-Max:

    85 °C

  • Operating Temperature-Min:

    -40 °C

  • Output Polarity:

    TRUE

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP16,.3

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Packing Method:

    TR

  • Peak Reflow Temperature (Cel):

    260

  • Prop. Delay@Nom-Sup:

    0.25 ns

  • Propagation Delay (tpd):

    0.25 ns

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    2.1 mm

  • Supply Voltage-Max (Vsup):

    5.25 V

  • Supply Voltage-Min (Vsup):

    4.75 V

  • Supply Voltage-Nom (Vsup):

    5 V

  • Surface Mount:

    YES

  • Technology:

    CMOS

  • Terminal Finish:

    MATTE TIN

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Width:

    5.3 mm

QS3257S1G8 Frequently Asked Questions (FAQs)

  • Renesas provides a recommended PCB layout guide in their application note (APN) documents, which includes thermal vias, thermal pads, and heat sink recommendations to ensure optimal thermal performance.
  • The QS3257S1G8 has an internal overcurrent protection (OCP) feature that can be enabled by setting the OCP threshold through the I2C interface. Additionally, external OCP circuits can be implemented using resistors and comparators to provide an extra layer of protection.
  • The recommended power-up sequence is to first apply the input voltage (VIN) and then the enable signal (EN). This ensures that the internal voltage regulators are properly initialized and the device is configured correctly.
  • To troubleshoot I2C interface issues, check the I2C bus voltage levels, clock frequency, and signal integrity. Use an oscilloscope or logic analyzer to verify the I2C signals and ensure that the slave address is correctly set. Also, check the device's datasheet for specific I2C timing requirements.
  • The QS3257S1G8 has an operating temperature range of -40°C to 125°C, but the maximum junction temperature (TJ) should not exceed 150°C. Ensure that the device is properly heat-sinked and that the thermal design is adequate to prevent overheating.

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QS3257S1G8 Overview

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QS3257S1G8 Alternates

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