SCES917B December   2019  – March 2021 SN74LXCH8T245

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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, VCCA = 1.2 ± 0.1 V
    7. 6.7  Switching Characteristics, VCCA = 1.5 ± 0.1 V
    8. 6.8  Switching Characteristics, VCCA = 1.8 ± 0.15 V
    9. 6.9  Switching Characteristics, VCCA = 2.5 ± 0.2 V
    10. 6.10 Switching Characteristics, VCCA = 3.3 ± 0.3 V
    11. 6.11 Switching Characteristics, VCCA = 5.0 ± 0.5 V
    12. 6.12 Switching Characteristics: Tsk, TMAX
    13. 6.13 Operating Characteristics
    14. 6.14 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Load Circuit and Voltage Waveforms
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  CMOS Schmitt-Trigger Inputs with Integrated Pulldowns
        1. 8.3.1.1 Control Inputs with Integrated Static Pull-Down Resistors
      2. 8.3.2  Balanced High-Drive CMOS Push-Pull Outputs
      3. 8.3.3  Partial Power Down (Ioff)
      4. 8.3.4  VCC Isolation and VCC Disconnect
      5. 8.3.5  Over-Voltage Tolerant Inputs
      6. 8.3.6  Glitch-Free Power Supply Sequencing
      7. 8.3.7  Negative Clamping Diodes
      8. 8.3.8  Fully Configurable Dual-Rail Design
      9. 8.3.9  Supports High-Speed Translation
      10. 8.3.10 Bus-Hold Data Inputs
    4. 8.4 Device Functional Modes
  9. 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
      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 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

6.5 Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)(1) (2)
PARAMETER TEST CONDITIONS VCCA VCCB Operating free-air temperature (TA) UNIT
25°C –40°C to 85°C –40°C to 125°C
MIN TYP MAX MIN TYP MAX MIN TYP MAX
VT+ Positive-going input-threshold voltage Control Inputs
(OE, DIR)
(Referenced to VCCA)		 1.1 V 1.1 V 0.44 0.88 0.44 0.88 V
1.4 V 1.4 V 0.60 0.98 0.60 0.98
1.65 V 1.65 V 0.76 1.13 0.76 1.13
2.3 V 2.3 V 1.08 1.56 1.08 1.56
3 V 3 V 1.48 1.92 1.48 1.92
4.5 V 4.5 V 2.19 2.74 2.19 2.74
5.5 V 5.5 V 2.65 3.33 2.65 3.33
VT- Negative-going input-threshold voltage Control Inputs
(OE, DIR)
(Referenced to VCCA)		 1.1 V 1.1 V 0.17 0.48 0.17 0.48 V
1.4 V 1.4 V 0.28 0.6 0.28 0.6
1.65 V 1.65 V 0.35 0.71 0.35 0.71
2.3 V 2.3 V 0.56 1 0.56 1
3 V 3 V 0.89 1.5 0.89 1.5
4.5 V 4.5 V 1.51 2 1.51 2
5.5 V 5.5 V 1.88 2.46 1.88 2.46
ΔVT Input-threshold hysteresis
(VT+ – VT-)		 Control Inputs
(OE, DIR)
(Referenced to VCCA)		 1.1 V 1.1 V 0.2 0.4 0.2 0.4 V
1.4 V 1.4 V 0.25 0.5 0.25 0.5
1.65 V 1.65 V 0.3 0.55 0.3 0.55
2.3 V 2.3 V 0.38 0.65 0.38 0.65
3 V 3 V 0.46 0.72 0.46 0.72
4.5 V 4.5 V 0.58 0.93 0.58 0.93
5.5 V 5.5 V 0.69 1.06 0.69 1.06
VOH High-level output voltage (3) IOH = –100 µA 1.1V – 5.5V 1.1V – 5.5V VCCO – 0.1 VCCO – 0.1 V
IOH = –4 mA 1.4 V 1.4 V 1 1
IOH = –8 mA 1.65 V 1.65 V 1.2 1.2
IOH = –12 mA 2.3 V 2.3 V 1.9 1.9
IOH = –24 mA 3 V 3 V 2.4 2.4
IOH = –32 mA 4.5 V 4.5 V 3.8 3.8
VOL Low-level output voltage (4) IOL = 100 µA 1.1V – 5.5V 1.1V – 5.5V 0.1 0.1 V
IOL = 4 mA 1.4 V 1.4 V 0.3 0.3
IOL = 8 mA 1.65 V 1.65 V 0.45 0.45
IOL = 12 mA 2.3 V 2.3 V 0.3 0.3
IOL = 24 mA 3 V 3 V 0.55 0.55
IOL = 32 mA 4.5 V 4.5 V 0.55 0.55
IBHL Bus-hold low sustaining current
Port A or Port B (6) 		VI = 0.39 1.1 V 1.1 V 4 4 µA
VI = 0.49 1.4 V 1.4 V 15 10
VI = 0.58 1.65 V 1.65 V 25 20
VI = 0.70 2.3 V 2.3 V 45 45
VI = 0.80 3 V 3 V 75 75
VI = 1.35 4.5 V 4.5 V 100 100
IBHH Bus-hold high sustaining current
Port A or Port B (7) 		VI = 0.71 V 1.1 V 1.1 V –4 –4 µA
VI = 0.91 V 1.4 V 1.4 V –15 –10
VI = 1.07 V 1.65 V 1.65 V –25 –20
VI = 1.70 V 2.3 V 2.3 V –45 –45
VI = 2.00 V 3 V 3 V –75 –75
VI = 3.15 V 4.5 V 4.5 V –100 –100
IBHLO Bus-hold low overdrive current (8) Ramp input up
VI = 0 to VCCI 		1.3 V 1.3 V 75 75 µA
1.6 V 1.6 V 125 125
1.95 V 1.95 V 200 200
2.7 V 2.7 V 300 300
3.6 V 3.6 V 500 500
5.5 V 5.5 V 900 900
IBHHO Bus-hold high overdrive current (9) Ramp input down
VI = VCCI to 0		 1.3 V 1.3 V –75 –75 µA
1.6 V 1.6 V –125 –125
1.95 V 1.95 V –200 –200
2.7 V 2.7 V –300 –300
3.6 V 3.6 V –500 –500
5.5 V 5.5 V –900 –900
II Input leakage current Control inputs
(DIR, OE)
VI = VCCA or GND		 1.1V – 5.5V 1.1V – 5.5V –0.1 1.5 –0.1 2 –0.1 2 µA
Data Inputs
(Ax, Bx)
VI = VCCI or GND		 1.1V – 5.5V 1.1V – 5.5V –0.3 0.3 –1 1 –2 2 µA
Ioff Partial power down current A Port
VI or VO = 0 V - 5.5 V  		0 V 0 V – 5.5 V –1.5 1.5 –2 2 –2.5 2.5 µA
B Port
VI or VO = 0 V - 5.5 V		 0 V – 5.5 V 0 V –1.5 1.5 –2 2 –2.5 2.5
Ioff-float Floating supply Partial power down current A Port
VI or VO = GND		 Floating 0 V – 5.5 V –1.5 1.5 –2 2 –2.5 2.5 µA
B Port
VI or VO = GND		 0 V - 5.5 V Floating –1.5 1.5 –2 2 –2.5 2.5
IOZ Tri-state output current (5) A or B Port: (Rev)
VI = VCCI or GND
VO = VCCO or GND
OE = VT+(MAX) 		1.1V – 5.5V 1.1V – 5.5V –1 1 –1 1 –2 2 µA
ICCA VCCA supply current VI = VCCI or GND
IO = 0		 1.1V – 5.5V 1.1V – 5.5V 2 4 8 µA
0 V 5.5 V –0.2 –0.5 –1
5.5 V 0 V 2 4 8
5.5 V Floating 2 4 8
ICCB VCCB supply current VI = VCCI or GND
IO = 0		 1.1V – 5.5V 1.1V – 5.5V 2 4 8 µA
0 V 5.5 V 2 4 8
5.5 V 0 V –0.2 –0.5 –1
Floating 5.5 V 2 4 8
ICCA + ICCB Combined supply current VI = VCCI or GND
IO = 0		 1.1V – 5.5V 1.1V – 5.5V 4 8 12 µA
ΔICCA VCCA additional supply current per input Control inputs (DIR, OE):
VI = VCCA – 0.6 V
A port = VCCA or GND
B Port = open		 3.0 V – 5.5V 3.0 V – 5.5V 50 75 µA
Ci Control Input Capacitance VI = 3.3 V or GND 3.3 V 3.3 V 2.9 5 5 pF
Cio Data I/O Capacitance OE = VCCA, VO = 1.65V DC +1 MHz -16 dBm sine wave 3.3 V 3.3 V 5.9 10 10 pF
(1) VCCI is the VCC associated with the input port.
(2) VCCO is the VCC associated with the output port.
(3) Tested at VI = VT+(MAX).
(4) Tested at VI = VT-(MIN).
(5) For I/O ports, the parameter IOZ includes the input leakage current.
(6) IBHL should be measured after lowering VI to GND and then raising it to the defined input voltage.
(7) IBHH should be measured after raising VI to VCCI and then lowering it to the defined input voltage.
(8) An external driver must source at least IBHLO to switch this node from low-to-high.
(9) An external driver must sink at least IBHHO to switch this node from high to low.