SCPS145B December   2007  – February 2016 P82B715


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Sx and Sy
      2. 8.3.2 Lx and Ly
      3. 8.3.3 Lx/Ly Buffered Bus Circuitry
    4. 8.4 Device Functional Modes
      1. 8.4.1 Idle Bus
      2. 8.4.2 Active-Low Bus
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. I2C Systems
        2. Pullup Resistance Calculation
        3. Calculating Bus Drive Currents
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Community Resource
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
VCC Supply voltage –0.3 12 V
Vb I2C bus voltage Sx or Sy 0 VCC V
Buffered bus voltage Lx or Ly 0 VCC
IO Continuous output current Sx or Sy 60 mA
Lx or Ly 60
ICC Continuous current through VCC or GND 60 mA
Tstg Storage temperature –55 125 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

6.2 ESD Ratings

V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2500 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
Machine model (MM) ±400
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

VCC Supply voltage(1) 4.5 12 V
TA Operating free-air temperature –40 85 °C
(1) Operation with reduced performance is possible down to 3 V. Typical static sinking performance is not degraded at 3 V, but the dynamic sink currents while the output is being driven through VCC/2 are reduced and can increase fall times. Timing-critical designs should accommodate the specified minimums.

6.4 Thermal Information

RθJA Junction-to-ambient thermal resistance 105.3 48.9 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 51.1 38.1 °C/W
RθJB Junction-to-board thermal resistance 46.2 26.1 °C/W
ψJT Junction-to-top characterization parameter 8.5 15.4 °C/W
ψJB Junction-to-board characterization parameter 45.6 26 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance N/A N/A °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

6.5 Electrical Characteristics

VCC = 5 V, TA = 25°C, voltages are specified with respect to GND (unless otherwise specified)
ICC Quiescent supply current Sx = Sy = VCC 14 mA
VCC = 12 V 15
Both I2C inputs low,
Both buffered outputs sinking 30 mA
IIOS Output sink current on I2C bus Sx, Sy VCC > 3 V,
VSx, VSy (low) = 0.4 V,
VLx, VLy (low) on buffered bus = 0.3 V,
ILx, ILy = –3 mA (1)
2.6 mA
IIOL Output sink current on buffered bus Lx, Ly VLx, VLy (low) = 0.4 V,
VSx, VSy (low) on I2C bus = 0.3 V
30 mA
3 V < VCC < 4.5 V,
VLx, VLy (low) = 0.4 V to 1.5 V,
ISx, ISy sinking on I2C bus < –4 mA
3 V < VCC < 4.5 V,
VLx, VLy (low) = 1.5 V to VCC,
ISx, ISy sinking on I2C bus = –7 mA
II Input current from I2C bus Sx, Sy ILx, ILy sink on buffered bus = 30 mA –3.2 mA
Input current from buffered bus(1) Lx, Ly VCC > 3 V,
ISx, ISy sink on I2C bus = 3 mA(1)
Leakage current on buffered bus VCC = 3 V to 12 V,
VLx, VLy = VCC,
VSx, VSy = VCC
200 μA
Zin/Zout Input/output impedance VSx < VLx, Buffer is active 8 10 13
(1) Buffer is passive in this test. The Sx/Sy sink current flows through an internal resistor to the driver connected at the Lx/Ly I/O.

6.6 Switching Characteristics

VCC = 5 V, TA = 25°C, no capacitive loads, voltages are specified with respect to GND (unless otherwise specified)
trise/fall Delay time to VLx voltage crossing VCC/2 for input drive current step ISx at Sx(1) (see Figure 2) RLx pullup = 270 Ω ISx
250 ns
Buffer delay time, switching edges between VLx input and
VSx output(2)
RLx pullup = 4700 Ω VLx
0 ns
(1) A conventional input-output delay is not observed in the Sx/Lx voltage waveforms, because the input and output pins are internally tied with a 30-Ω resistor so they show equal logic voltage levels to within 100 mV. When connected in an I2C system, an Sx/Sy input pin cannot rise/fall until the buffered bus load at the output pin has been driven by the internal amplifier. This test measures the bus propagation delay caused to falling or rising voltages at the Lx/Ly output (as well as the Sx/Sy input) by the amplifier’s response time. The figure given is measured with a drive current as shown in Figure 2. Because this is a dynamic bus test in which a corresponding bus driving IC has an output voltage well above 0.4 V, 6 mA is used instead of the static 3 mA.
(2) The signal path Lx to Sx and Ly to Sy is passive through the internal 30-Ω resistor. There is no amplifier involved and essentially no signal propagation delay.

6.7 Typical Characteristics

P82B715 D001_SCPS145.gif
Figure 1. Typical VOL of Lx/Ly (RPU on Sx = 4.7 kΩ, TA = 25 C, VSX = 0 V)