SN74AXCH4T245PWR

Product Folder Order Now Support & Community Tools & Software Technical Documents SN74AXCH4T245 SCES878 – MARCH 2019 SN74AXCH4T245 Four-bit bus transceiver with configurable voltage translation, tri-state outputs, and bus-hold inputs 1 Features • 1 • • • • • • • • • • Fully configurable dual-rail design allows each port to operate with a power supply range from 0.65 V to 3.6 V Bus-hold on data inputs eliminates the need for external pullup or pulldown resistors Operating temperature from –40°C to +125°C Multiple direction control pins to allow simultaneous up and down translation Glitch-free power supply sequencing Up to 380 Mbps support when translating from 1.8 V to 3.3 V VCC isolation feature Ioff supports partial-power-down mode operation Compatible with AVC family level shifters Latch-up performance exceeds 100 mA per JESD 78, Class II ESD protection exceeds JESD 22 – 8000-V Human-body model – 1000-V Charged-device model 2 Applications • • • • • Enterprise and communications Industrial Personal electronics Wireless infrastructure Building automation Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. If a supply is present for VCCA or VCCB, the bus-hold circuitry always remains active on the A or B inputs respectively, independent of the state of the direction control or output enable pins. To ensure the high-impedance state of the level shifter I/Os during power up or power down, the xOE pins should be tied to VCCA through a pullup resistor. This device is fully specified for partial-power-down applications using the Ioff current. The Ioff protection circuitry ensures that no excessive current is drawn from or sourced into an input, output, or combined I/O that is biased to a specific voltage while the device is powered down. The VCC isolation feature ensures that if either VCCA or VCCB is less than 100 mV, all I/O ports enter a high-impedance state by disabling the outputs. Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance. Device Information(1) PART NUMBER SN74AXCH4T245PW SN74AXCH4T245RSV UQFN (16) The SN74AXCH4T245 device is designed for asynchronous communication between data buses and transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level of the direction-control inputs (1DIR and 2DIR). The output-enable inputs (1OE and 2OE) are used to disable the outputs so the buses are effectively isolated. All control pins (xDIR and xOE) are referenced to VCCA. BODY SIZE (NOM) 5.00 mm x 4.40 mm 2.60 mm x 1.80 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Functional Block Diagram 3 Description The SN74AXCH4T245 is a four-bit noninverting bus transceiver that uses two individually configurable power-supply rails. The device is operational with both VCCA and VCCB supplies as low as 0.65 V. The A port is designed to track VCCA, which accepts any supply voltage from 0.65 V to 3.6 V. The B port is designed to track VCCB, which accepts any supply voltage from 0.65 V to 3.6 V. The SN74AXCH4T245 device is compatible with a single-supply system. PACKAGE TSSOP (16) One of Two Transceiver Pairs VCCA VCCB xDIR xOE Bus-Hold xB1 xA1 Bus-Hold Bus-Hold xA2 xB2 Bus-Hold Note: Bus-hold circuits are only present for data inputs, not control inputs 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com Table of Contents 1 2 3 4 5 6 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.10 6.11 6.12 6.13 6.14 6.15 7 7.1 Load Circuit and Voltage Waveforms ..................... 19 1 1 1 2 3 4 8 Detailed Description ............................................ 21 8.1 8.2 8.3 8.4 9 Absolute Maximum Ratings ...................................... 4 ESD Ratings.............................................................. 4 Recommended Operating Conditions....................... 5 Thermal Information .................................................. 5 Electrical Characteristics........................................... 6 Switching Characteristics, VCCA = 0.7 ± 0.05 V ........ 8 Switching Characteristics, VCCA = 0.8 ± 0.04 V ........ 9 Switching Characteristics, VCCA = 0.9 ± 0.045 V .... 10 Switching Characteristics, VCCA = 1.2 ± 0.1 V ........ 11 Switching Characteristics, VCCA = 1.5 ± 0.1 V ...... 12 Switching Characteristics, VCCA = 1.8 ± 0.15 V .... 13 Switching Characteristics, VCCA = 2.5 ± 0.2 V ...... 14 Switching Characteristics, VCCA = 3.3 ± 0.3 V ...... 15 Operating Characteristics: TA = 25°C ................... 16 Typical Characteristics .......................................... 18 Overview ................................................................. Functional Block Diagram ....................................... Feature Description................................................. Device Functional Modes........................................ 21 21 21 23 Application and Implementation ........................ 24 9.1 Application Information............................................ 24 9.2 Typical Application ................................................. 24 10 Power Supply Recommendations ..................... 26 11 Layout................................................................... 26 11.1 Layout Guidelines ................................................. 26 11.2 Layout Example .................................................... 26 12 Device and Documentation Support ................. 27 12.1 12.2 12.3 12.4 12.5 12.6 Related Documentation ....................................... Receiving Notification of Documentation Updates Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 27 27 27 27 27 27 13 Mechanical, Packaging, and Orderable Information ........................................................... 28 Parameter Measurement Information ................ 19 4 Revision History 2 DATE REVISION NOTES March 2019 * Initial release. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 5 Pin Configuration and Functions PW Package 16-Pin TSSOP Top View VCCA RSV Package 16-Pin UQFN Transparent Top View 2DIR 3 14 2OE 1A1 4 13 1B1 1OE 1 12 2B2 1A2 5 1B2 VCCB 2 11 GND 2A1 6 12 11 2B1 VCCA 3 10 GND 2A2 7 2B2 4 9 2A2 GND 8 10 9 1DIR 13 5 6 7 8 2A1 14 1A2 15 1A1 16 2DIR GND 2B1 1OE 1B2 15 1B1 VCCB 2OE 16 1DIR 1 2 Pin Functions PIN NAME NO. TYPE DESCRIPTION PW RSV 1A1 4 6 I/O Input/output 1A1. Referenced to VCCA. 1A2 5 7 I/O Input/output 1A2. Referenced to VCCA. 1B1 13 15 I/O Input/output 1B1. Referenced to VCCB. 1B2 12 14 I/O Input/output 1B2. Referenced to VCCB. 1DIR 2 4 I Direction-control input for ‘1’ ports 1OE 15 1 I Tri-state output-mode enable. Pull OE high to place ‘1’ outputs in tri-state mode. Referenced to VCCA. 2A1 6 8 I/O Input/output 2A1. Referenced to VCCA. 2A2 7 9 I/O Input/output 2A2. Referenced to VCCA. 2B1 11 13 I/O Input/output 2B1. Referenced to VCCB. 2B2 10 12 I/O Input/output 2B2. Referenced to VCCB. 2DIR 3 5 I Direction-control input for ‘2’ ports 2OE 14 16 I Tri-state output-mode enable. Pull OE high to place ‘2’ outputs in tri-state mode. Referenced to VCCA. GND 8, 9 10, 11 — Ground VCCA 1 3 — A-port power supply voltage. 0.65 V ≤ VCCA ≤ 3.6 V VCCB 16 2 — B-port power supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 3 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) MIN MAX UNIT S VCCA Supply voltage A –0.5 4.2 V VCCB Supply voltage B –0.5 4.2 V I/O Ports (A Port) –0.5 4.2 I/O Ports (B Port) –0.5 4.2 Control Inputs –0.5 4.2 A Port –0.5 4.2 B Port –0.5 4.2 A Port –0.5 VCCA + 0.2 B Port –0.5 VCCB + 0.2 Input Voltage (2) VI VO Voltage applied to any output in the high-impedance or power-off state (2) VO Voltage applied to any output in the high or low state (2) (3) IIK Input clamp current VI < 0 –50 IOK Output clamp current VO < 0 –50 IO Continuous output current Continuous current through VCC or GND Tj Junction Temperature Tstg Storage temperature (1) (2) (3) V V V mA mA –50 50 mA –100 100 mA 150 °C 150 °C –65 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. The input voltage and output negative-voltage ratings may be exceeded if the input and output current ratings are observed. The output positive-voltage rating may be exceeded up to 4.2 V maximum if the output current rating is observed. 6.2 ESD Ratings VALUE V(ESD) (1) (2) 4 Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±8000 Charged device model (CDM), per JEDEC specification JESD22-C101 (2) ±1000 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) (1) (2) (3) MIN MAX UNIT VCCA Supply voltage A 0.65 3.6 V VCCB Supply voltage B 0.65 3.6 V Data Inputs VCCI = 0.65 V - 0.75 V VCCI x 0.70 VCCI = 0.76 V - 1 V VCCI x 0.70 VCCI = 1.1 V - 1.95 V VCCI x 0.65 VCCI = 2.3 V - 2.7 V VIH High-level input voltage Control Inputs(xDIR, xOE) Referenced to VCCA VCCI x 0.65 VCCA = 0.65 V - 0.75 V VCCA x 0.70 VCCA = 0.76 V - 1 V VCCA x 0.70 VCCA = 1.1 V - 1.95 V VCCA x 0.65 VCCA = 2.3 V - 2.7 V VCCA = 3 V - 3.6 V Data Inputs VIL Low-level input voltage Control Inputs(xDIR, xOE) Referenced to VCCA 1.6 VCCI = 3 V - 3.6 V 1.6 VCCA x 0.65 VCCI = 0.65 V - 0.75 V VCCI x 0.30 VCCI = 0.76 V - 1 V VCCI x 0.30 VCCI = 1.1 V - 1.95 V VCCI x 0.35 VCCI = 2.3 V - 2.7 V 0.7 VCCI = 3 V - 3.6 V 0.8 VCCA = 0.65 V - 0.75 V VCCA x 0.30 VCCA = 0.76 V - 1 V VCCA x 0.30 VCCA = 1.1 V - 1.95 V VCCA x 0.35 VCCA = 2.3 V - 2.7 V 0.7 VCCA = 3 V - 3.6 V VI Input voltage 0.8 (3) 0 3.6 Active State 0 VCCO Tri-State 0 3.6 10 ns/V –40 125 °C VO Output voltage Δt/Δv (2) Input transition rise and fall time TA Operating free-air temperature (1) (2) (3) V V V VCCI is the VCC associated with the input port. VCCO is the VCC associated with the output port. All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, SCBA004. 6.4 Thermal Information SN74AXCH4T245 THERMAL METRIC (1) PW (TSSOP) RSV (UQFN) 16 PINS 16 PINS UNIT RθJA Junction-to-ambient thermal resistance 126.9 130.1 °C/W RθJC(top) Junction-to-case (top) thermal resistance 49.3 70.3 °C/W RθJB Junction-to-board thermal resistance 74.3 57.4 °C/W ψJT Junction-to-top characterization parameter 8.1 4.6 °C/W ψJB Junction-to-board characterization parameter 73.4 55.8 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 5 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.5 Electrical Characteristics over operating free-air temperature range (unless otherwise noted) (1) (2) Operating free-air temperature (TA) PARAMETER TEST CONDITIONS VCCA VCCB -40°C to 85°C MIN TYP (3) VOH VOL IBHL High-level output voltage Low-level output voltage Bus-hold low sustaining current (Port A or Port B) (4) IBHH Bus-hold high sustaining current (Port A or Port B) (5) (1) (2) (3) (4) (5) 6 -40°C to 125°C MAX MIN TYP (3) UNIT MAX VCCO – 0.1 VCCO – 0.1 0.65 V 0.55 0.55 0.76 V 0.58 0.58 0.85 V 0.85 V 0.65 0.65 IOH = -3 mA 1.1 V 1.1 V 0.85 0.85 IOH = -6 mA 1.4 V 1.4 V 1.05 1.05 IOH = -8 mA 1.65 V 1.65 V 1.2 1.2 IOH = -9 mA 2.3 V 2.3 V 1.75 1.75 IOH = -12 mA 3V 3V IOL = 100 µA 0.7 V - 3.6 V 0.7 V - 3.6 V 0.1 0.1 IOL = 50 µA 0.65 V 0.65 V 0.1 0.1 IOL = 200 µA 0.76 V 0.76 V 0.18 0.18 IOL = 500 µA 0.85 V 0.85 V 0.2 0.2 IOL = 3 mA 1.1 V 1.1 V 0.25 0.25 IOL = 6 mA 1.4 V 1.4 V 0.35 0.35 IOL = 8 mA 1.65 V 1.65 V 0.45 0.45 IOL = 9 mA 2.3 V 2.3 V 0.55 0.55 IOL = 12 mA 3V 3V 0.7 0.7 VI = 0.20 V 0.65 V 0.65 V 4 VI = 0.23 V 0.76 V 0.76 V 8 7 VI = 0.26 V 0.85 V 0.85 V 10 10 VI = 0.39 V 1.1 V 1.1 V 20 20 VI = 0.49 V 1.4 V 1.4 V 40 30 VI = 0.58 V 1.65 V 1.65 V 55 45 VI = 0.7 V 2.3 V 2.3 V VI = 0.8 V 3V 3V VI = 0.20 V 0.65 V VI = 0.23 V 0.76 V VI = 0.26 V VI = 0.39 V VI = VIH VI = VIL IOH = -100 µA 0.7 V - 3.6 V 0.7 V - 3.6 V IOH = -50 µA 0.65 V IOH = -200 µA 0.76 V IOH = -500 µA 2.3 V 2.3 V 4 90 80 145 135 0.65 V –4 –4 0.76 V –8 –7 0.85 V 0.85 V –10 –10 1.1 V 1.1 V –20 –20 VI = 0.49 V 1.4 V 1.4 V –40 –30 VI = 0.58 V 1.65 V 1.65 V –55 –45 VI = 0.7 V 2.3 V 2.3 V –90 –80 VI = 0.8 V 3V 3V –145 –135 µA µA VCCI is the VCC associated with the input port. VCCO is the VCC associated with the output port. All typical data is taken at 25°C. The bus-hold circuit can sink at least the minimum low sustaining current at VIL max. IBHL should be measured after lowering VIN to GND and then raising it to VIL max. The bus-hold circuit can source at least the minimum high sustaining current at VIH min. IBHH should be measured after raising VIN to VCC and then lowering it to VIH min. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 Electrical Characteristics (continued) over operating free-air temperature range (unless otherwise noted) (1)(2) Operating free-air temperature (TA) PARAMETER TEST CONDITIONS VCCA VCCB -40°C to 85°C MIN TYP (3) IBHLO Bus-hold low overdrive current (Port A or Port B) VI = 0 to VCC (6) IBHHO Bus-hold high overdrive current (Port A or Port B) VI = 0 to VCC (7) Control inputs (xDIR, Input leakage xOE): VI = VCCA or GND current Data Inputs (xAx, xBx) VI = VCCI or GND II Partial power down current Ioff 0.75 V 0.75 V 40 40 0.84 V 0.84 V 50 50 0.95 V 0.95 V 65 65 1.3 V 1.3 V 105 105 1.6 V 1.6 V 150 150 1.95 V 1.95 V 205 205 2.7 V 2.7 V 335 335 3.6 V 3.6 V 480 480 0.75 V 0.75 V –40 –40 0.84 V 0.84 V –50 –50 0.95 V 0.95 V –65 –65 1.3 V 1.3 V –105 –105 1.6 V 1.6 V –150 –150 1.95 V 1.95 V –205 –205 2.7 V 2.7 V –335 –335 3.6 V 3.6 V –480 –480 UNIT MAX µA µA –0.5 0.5 –1 1 µA 0.65 V- 3.6 V 0.65 V- 3.6 V –4 4 –8 8 µA A Port: VI or VO = 0 V 3.6 V 0V 0 V - 3.6 V –8 8 –12 12 B Port: VI or VO = 0 V 3.6 V 0 V - 3.6 V 0V –8 8 –12 12 3.6 V 3.6 V –4 4 –8 8 Tri-state output current (8) A or B Port VI = VCCI or GND, VO = VCCO or GND, OE = VIH ICCA VCCA supply current VI = VCCI or GND ICCB MIN TYP (3) 0.65 V- 3.6 V 0.65 V- 3.6 V IOZ VCCB supply current -40°C to 125°C MAX µA 0.65 V- 3.6 V 0.65 V- 3.6 V IO = 0 0V 3.6 V 3.6 V 0V 13 –2 IO = 0 IO = 0 0V 3.6 V 3.6 V 0V 26 –12 0.65 V- 3.6 V 0.65 V- 3.6 V VI = VCCI or GND µA 8 16 13 26 8 –2 µA 16 µA 40 µA –12 ICCA + ICCB Combined supply current VI = VCCI or GND Ci Control Input Capacitance VI = 3.3 V or GND 3.3 V 3.3 V 4.5 4.5 pF Cio Data I/O Capacitance OE = VCCA, VO = 1.65V DC +1 MHz -16 dBm sine wave 3.3 V 3.3 V 7.4 7.4 pF (6) (7) (8) 0.65 V- 3.6 V 0.65 V- 3.6 V 20 An external driver must source at least IBHLO to switch this node from low to high. An external driver must sink at least IBHHO to switch this node from high to low. For I/O ports, the parameter IOZ includes the input leakage current. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 7 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.6 Switching Characteristics, VCCA = 0.7 ± 0.05 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B A OE A Disable time OE B A Enable time OE 8 B Propagation delay OE ten TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 161 0.5 109 0.5 78 0.5 41 0.5 38 0.5 41 0.5 68 0.5 181 -40°C to 125°C 0.5 161 0.5 109 0.5 78 0.5 41 0.5 38 0.5 41 0.5 68 0.5 181 -40°C to 85°C 0.5 161 0.5 134 0.5 112 0.5 59 0.5 22 0.5 15 0.5 11 0.5 10 -40°C to 125°C 0.5 161 0.5 134 0.5 112 0.5 59 0.5 22 0.5 16 0.5 11 0.5 10 -40°C to 85°C 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 -40°C to 125°C 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 0.5 159 -40°C to 85°C 0.5 158 0.5 122 0.5 102 0.5 55 0.5 54 0.5 56 0.5 65 0.5 125 -40°C to 125°C 0.5 158 0.5 122 0.5 102 0.5 55 0.5 54 0.5 56 0.5 65 0.5 125 -40°C to 85°C 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 -40°C to 125°C 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 0.5 243 -40°C to 85°C 0.5 292 0.5 192 0.5 134 0.5 87 0.5 73 0.5 69 0.5 70 0.5 148 -40°C to 125°C 0.5 292 0.5 192 0.5 134 0.5 88 0.5 74 0.5 69 0.5 70 0.5 148 Submit Documentation Feedback 1.8 ± 0.15 V UNIT ns ns ns Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 6.7 Switching Characteristics, VCCA = 0.8 ± 0.04 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B Propagation delay B A OE A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1.8 ± 0.15 V MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 134 0.5 90 0.5 64 0.5 30 0.5 24 0.5 23 0.5 25 0.5 34 -40°C to 125°C 0.5 134 0.5 90 0.5 64 0.5 30 0.5 24 0.5 23 0.5 25 0.5 34 -40°C to 85°C 0.5 109 0.5 90 0.5 72 0.5 39 0.5 22 0.5 15 0.5 11 0.5 10 -40°C to 125°C 0.5 109 0.5 90 0.5 72 0.5 39 0.5 22 0.5 15 0.5 11 0.5 10 -40°C to 85°C 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 -40°C to 125°C 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 0.5 110 -40°C to 85°C 0.5 147 0.5 111 0.5 91 0.5 42 0.5 36 0.5 35 0.5 37 0.5 47 -40°C to 125°C 0.5 147 0.5 111 0.5 91 0.5 42 0.5 36 0.5 35 0.5 37 0.5 47 -40°C to 85°C 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 -40°C to 125°C 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 0.5 143 -40°C to 85°C 0.5 253 0.5 164 0.5 117 0.5 71 0.5 57 0.5 52 0.5 47 0.5 53 -40°C to 125°C 0.5 253 0.5 164 0.5 117 0.5 73 0.5 58 0.5 53 0.5 48 0.5 53 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 UNIT ns ns ns 9 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.8 Switching Characteristics, VCCA = 0.9 ± 0.045 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B A OE A Disable time OE B A Enable time OE 10 B Propagation delay OE ten TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 112 0.5 72 0.5 54 0.5 24 0.5 19 0.5 17 0.5 16 0.5 19 -40°C to 125°C 0.5 112 0.5 72 0.5 54 0.5 24 0.5 19 0.5 17 0.5 16 0.5 19 -40°C to 85°C 0.5 78 0.5 64 0.5 54 0.5 27 0.5 19 0.5 14 0.5 10 0.5 10 -40°C to 125°C 0.5 78 0.5 64 0.5 54 0.5 27 0.5 19 0.5 14 0.5 10 0.5 10 -40°C to 85°C 0.5 81 0.5 81 0.5 81 0.5 81 0.5 81 0.5 81 0.5 81 0.5 81 -40°C to 125°C 0.5 82 0.5 82 0.5 82 0.5 82 0.5 82 0.5 82 0.5 82 0.5 82 -40°C to 85°C 0.5 141 0.5 106 0.5 85 0.5 36 0.5 29 0.5 27 0.5 26 0.5 30 -40°C to 125°C 0.5 141 0.5 106 0.5 85 0.5 37 0.5 30 0.5 28 0.5 26 0.5 30 -40°C to 85°C 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 -40°C to 125°C 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 0.5 84 -40°C to 85°C 0.5 229 0.5 149 0.5 107 0.5 63 0.5 48 0.5 43 0.5 37 0.5 38 -40°C to 125°C 0.5 229 0.5 149 0.5 107 0.5 65 0.5 50 0.5 45 0.5 39 0.5 39 Submit Documentation Feedback 1.8 ± 0.15 V UNIT ns ns ns Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 6.9 Switching Characteristics, VCCA = 1.2 ± 0.1 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B Propagation delay B A OE A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1.8 ± 0.15 V MIN MAX MIN MAX MIN MAX UNIT -40°C to 85°C 0.5 60 0.5 39 0.5 27 0.5 15 0.5 11 0.5 10 0.5 8 0.5 9 -40°C to 125°C 0.5 60 0.5 39 0.5 27 0.5 15 0.5 12 0.5 10 0.5 9 0.5 9 -40°C to 85°C 0.5 41 0.5 30 0.5 24 0.5 15 0.5 11 0.5 9 0.5 7 0.5 7 -40°C to 125°C 0.5 41 0.5 30 0.5 24 0.5 15 0.5 11 0.5 9 0.5 7 0.5 7 -40°C to 85°C 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 0.5 28 -40°C to 125°C 0.5 30 0.5 30 0.5 30 0.5 30 0.5 30 0.5 30 0.5 30 0.5 30 -40°C to 85°C 0.5 133 0.5 100 0.5 79 0.5 29 0.5 22 0.5 20 0.5 17 0.5 17 -40°C to 125°C 0.5 134 0.5 100 0.5 80 0.5 31 0.5 23 0.5 21 0.5 18 0.5 18 -40°C to 85°C 0.5 37 0.5 37 0.5 37 0.5 37 0.5 37 0.5 37 0.5 37 0.5 37 -40°C to 125°C 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 0.5 39 -40°C to 85°C 0.5 168 0.5 109 0.5 77 0.5 51 0.5 37 0.5 31 0.5 25 0.5 23 -40°C to 125°C 0.5 168 0.5 109 0.5 78 0.5 53 0.5 39 0.5 34 0.5 27 0.5 24 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 ns ns ns 11 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.10 Switching Characteristics, VCCA = 1.5 ± 0.1 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B A OE A Disable time OE B A Enable time OE 12 B Propagation delay OE ten TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 22 0.5 22 0.5 19 0.5 11 0.5 9 0.5 8 0.5 7 0.5 6 -40°C to 125°C 0.5 22 0.5 22 0.5 19 0.5 11 0.5 9 0.5 8 0.5 7 0.5 6 -40°C to 85°C 0.5 38 0.5 24 0.5 19 0.5 11 0.5 9 0.5 8 0.5 5 0.5 5 -40°C to 125°C 0.5 38 0.5 24 0.5 19 0.5 11 0.5 9 0.5 8 0.5 6 0.5 5 -40°C to 85°C 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 -40°C to 125°C 0.5 21 0.5 21 0.5 21 0.5 21 0.5 21 0.5 21 0.5 21 0.5 21 -40°C to 85°C 0.5 131 0.5 98 0.5 78 0.5 27 0.5 20 0.5 18 0.5 14 0.5 14 -40°C to 125°C 0.5 132 0.5 98 0.5 78 0.5 29 0.5 21 0.5 19 0.5 15 0.5 15 -40°C to 85°C 0.5 23 0.5 23 0.5 23 0.5 23 0.5 23 0.5 23 0.5 23 0.5 23 -40°C to 125°C 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 0.5 25 -40°C to 85°C 0.5 109 0.5 84 0.5 67 0.5 43 0.5 31 0.5 26 0.5 20 0.5 18 -40°C to 125°C 0.5 109 0.5 84 0.5 68 0.5 45 0.5 34 0.5 29 0.5 22 0.5 19 Submit Documentation Feedback 1.8 ± 0.15 V UNIT ns ns ns Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 6.11 Switching Characteristics, VCCA = 1.8 ± 0.15 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B Propagation delay B A OE A Disable time OE OE ten TO B A Enable time OE B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1.8 ± 0.15 V MIN MAX MIN MAX MIN MAX UNIT -40°C to 85°C 0.5 15 0.5 15 0.5 14 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 -40°C to 125°C 0.5 16 0.5 15 0.5 14 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 -40°C to 85°C 0.5 41 0.5 23 0.5 17 0.5 10 0.5 8 0.5 7 0.5 5 0.5 4 -40°C to 125°C 0.5 41 0.5 23 0.5 17 0.5 10 0.5 8 0.5 7 0.5 5 0.5 4 -40°C to 85°C 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 -40°C to 125°C 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 -40°C to 85°C 0.5 129 0.5 98 0.5 77 0.5 27 0.5 19 0.5 17 0.5 13 0.5 13 -40°C to 125°C 0.5 131 0.5 98 0.5 77 0.5 28 0.5 21 0.5 18 0.5 14 0.5 14 -40°C to 85°C 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 -40°C to 125°C 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 -40°C to 85°C 0.5 102 0.5 73 0.5 60 0.5 38 0.5 28 0.5 24 0.5 19 0.5 16 -40°C to 125°C 0.5 102 0.5 75 0.5 62 0.5 41 0.5 31 0.5 26 0.5 20 0.5 18 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 ns ns ns 13 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.12 Switching Characteristics, VCCA = 2.5 ± 0.2 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B A OE A Disable time OE B A Enable time OE 14 B Propagation delay OE ten TO B Test Conditions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX -40°C to 85°C 0.5 11 0.5 11 0.5 10 0.5 7 0.5 6 0.5 5 0.5 5 0.5 5 -40°C to 125°C 0.5 11 0.5 11 0.5 10 0.5 7 0.5 6 0.5 5 0.5 5 0.5 5 -40°C to 85°C 0.5 68 0.5 25 0.5 17 0.5 8 0.5 7 0.5 6 0.5 5 0.5 4 -40°C to 125°C 0.5 68 0.5 25 0.5 17 0.5 9 0.5 7 0.5 6 0.5 5 0.5 4 -40°C to 85°C 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 -40°C to 125°C 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 -40°C to 85°C 0.5 128 0.5 96 0.5 76 0.5 26 0.5 18 0.5 16 0.5 12 0.5 12 -40°C to 125°C 0.5 129 0.5 96 0.5 77 0.5 27 0.5 20 0.5 17 0.5 13 0.5 13 -40°C to 85°C 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 -40°C to 125°C 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 0.5 13 -40°C to 85°C 0.5 120 0.5 69 0.5 54 0.5 33 0.5 24 0.5 20 0.5 16 0.5 14 -40°C to 125°C 0.5 120 0.5 70 0.5 56 0.5 36 0.5 26 0.5 22 0.5 18 0.5 15 Submit Documentation Feedback 1.8 ± 0.15 V UNIT ns ns ns Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 6.13 Switching Characteristics, VCCA = 3.3 ± 0.3 V See Figure 5 and Table 1 for test circuit and loading. See Figure 6, Figure 7, and Figure 8 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis B Propagation delay B A OE A Disable time OE ten TO B OE A OE B Enable time Test Condtions 0.7 ± 0.05 V 0.8 ± 0.04 V 0.9 ± 0.045 V 1.2 ± 0.1 V 1.5 ± 0.1 V 2.5 ± 0.2 V 3.3 ± 0.3 V MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX 1.8 ± 0.15 V MIN MAX MIN MAX MIN MAX UNIT -40°C to 85°C 0.5 10 0.5 10 0.5 10 0.5 7 0.5 5 0.5 5 0.5 5 0.5 4 -40°C to 125°C 0.5 10 0.5 10 0.5 10 0.5 7 0.5 5 0.5 5 0.5 5 0.5 4 -40°C to 85°C 0.5 182 0.5 34 0.5 19 0.5 9 0.5 6 0.5 5 0.5 5 0.5 4 -40°C to 125°C 0.5 182 0.5 34 0.5 19 0.5 9 0.5 6 0.5 6 0.5 5 0.5 4 -40°C to 85°C 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 -40°C to 125°C 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 0.5 12 -40°C to 85°C 0.5 142 0.5 96 0.5 76 0.5 26 0.5 18 0.5 16 0.5 12 0.5 11 -40°C to 125°C 0.5 142 0.5 97 0.5 77 0.5 27 0.5 19 0.5 17 0.5 13 0.5 12 -40°C to 85°C 0.5 9 0.5 9 0.5 9 0.5 9 0.5 9 0.5 9 0.5 9 0.5 9 -40°C to 125°C 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 -40°C to 85°C 0.5 194 0.5 82 0.5 57 0.5 33 0.5 22 0.5 18 0.5 14 0.5 13 -40°C to 125°C 0.5 194 0.5 82 0.5 58 0.5 35 0.5 24 0.5 20 0.5 16 0.5 14 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 ns ns ns 15 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.14 Operating Characteristics: TA = 25°C PARAMETER Power Dissipation Capacitance per transceiver (A to B: outputs enabled) Power Dissipation Capacitance per transceiver (A to B: outputs disabled) TEST CONDITIONS CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CpdA Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) 16 CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 2.2 0.8 V 0.8 V 2.3 0.9 V 0.9 V 2.3 1.2 V 1.2 V 2.3 1.5 V 1.5 V 2.2 1.8 V 1.8 V 2.2 2.5 V 2.5 V 2.5 3.3 V 3.3 V 2.6 0.7 V 0.7 V 1.5 0.8 V 0.8 V 1.7 0.9 V 0.9 V 1.7 1.2 V 1.2 V 1.7 1.5 V 1.5 V 1.5 1.8 V 1.8 V 1.5 2.5 V 2.5 V 1.8 3.3 V 3.3 V 2.1 0.7 V 0.7 V 12.6 0.8 V 0.8 V 12.4 0.9 V 0.9 V 12.4 1.2 V 1.2 V 12.8 1.5 V 1.5 V 13.3 1.8 V 1.8 V 14.6 2.5 V 2.5 V 18.0 3.3 V 3.3 V 21.1 0.7 V 0.7 V 1.1 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.0 1.2 V 1.2 V 1.0 1.5 V 1.5 V 1.0 1.8 V 1.8 V 0.9 2.5 V 2.5 V 0.9 3.3 V 3.3 V 0.9 Submit Documentation Feedback MAX UNIT pF pF pF pF Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 Operating Characteristics: TA = 25°C (continued) PARAMETER Power Dissipation Capacitance per transceiver (A to B: outputs enabled) Power Dissipation Capacitance per transceiver (A to B: outputs disabled) TEST CONDITIONS CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CpdB Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns CL = 0, RL = Open f = 1 MHz, tr = tf = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 12.6 0.8 V 0.8 V 12.4 0.9 V 0.9 V 12.4 1.2 V 1.2 V 12.8 1.5 V 1.5 V 13.3 1.8 V 1.8 V 14.6 2.5 V 2.5 V 17.8 3.3 V 3.3 V 21.0 0.7 V 0.7 V 1.1 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.0 1.2 V 1.2 V 1.0 1.5 V 1.5 V 1.0 1.8 V 1.8 V 0.9 2.5 V 2.5 V 0.9 3.3 V 3.3 V 0.9 0.7 V 0.7 V 2.2 0.8 V 0.8 V 2.2 0.9 V 0.9 V 2.2 1.2 V 1.2 V 2.0 1.5 V 1.5 V 2.0 1.8 V 1.8 V 1.9 2.5 V 2.5 V 2.0 3.3 V 3.3 V 2.6 0.7 V 0.7 V 1.6 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.6 1.2 V 1.2 V 1.4 1.5 V 1.5 V 1.3 1.8 V 1.8 V 1.2 2.5 V 2.5 V 1.4 3.3 V 3.3 V 1.9 MAX Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 UNIT pF pF pF pF 17 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com 6.15 Typical Characteristics 3.4 VCC = 1.8V VCC = 2.5V VCC = 3.3V 3.2 3 2.6 VOH (V) VOH (V) 2.8 2.4 2.2 2 1.8 1.6 1.4 2 4 6 8 10 12 IOH (mA) 14 16 18 0.5 1 1.5 2 D001 2.5 3 IOH (mA) 3.5 4 4.5 5 D001 Figure 1. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) Figure 2. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 -50 220 200 180 160 140 120 100 80 60 40 VCC = 1.8V VCC = 2.5V VCC = 3.3V VCC = 0.7V VCC = 1.2V 20 0 0 2 4 6 8 10 12 IOL (mA) 14 16 18 20 0 0.5 D001 Figure 3. Typical (TA=25°C) Output High Voltage (VOL) vs Sink Current (IOL) 18 VCC = 0.7V VCC = 1.2V 0 20 VOL (mV) VOL (mV) 0 1.25 1.2 1.15 1.1 1.05 1 0.95 0.9 0.85 0.8 0.75 0.7 0.65 0.6 0.55 1 1.5 2 2.5 3 IOL (mA) 3.5 4 4.5 5 D001 Figure 4. Typical (TA=25°C) Output High Voltage (VOL) vs Sink Current (IOL) Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 7 Parameter Measurement Information 7.1 Load Circuit and Voltage Waveforms Unless otherwise noted, all input pulses are supplied by generators having the following characteristics: • f = 1 MHz • ZO = 50 Ω • dv/dt ≤ 1 ns/V Measurement Point 2 x VCCO S1 RL Open Output Pin Under Test GND CL(1) (1) RL CL includes probe and jig capacitance. Figure 5. Load Circuit Table 1. Load Circuit Conditions Parameter VCCO RL CL S1 VTP Δt/Δv Input transition rise or fall rate 0.65 V – 3.6 V 1 MΩ 15 pF Open N/A 1.1 V – 3.6 V 2 kΩ 15 pF Open N/A tpd Propagation (delay) time 0.65 V – 0.95 V 20 kΩ 15 pF Open N/A ten, tdis Enable time, disable time ten, tdis Enable time, disable time 3 V – 3.6 V 2 kΩ 15 pF 2 × VCCO 0.3 V 1.65 V – 2.7 V 2 kΩ 15 pF 2 × VCCO 0.15 V 1.1 V – 1.6 V 2 kΩ 15 pF 2 × VCCO 0.1 V 0.65 V – 0.95 V 20 kΩ 15 pF 2 × VCCO 0.1 V 3 V – 3.6 V 2 kΩ 15 pF GND 0.3 V 1.65 V – 2.7 V 2 kΩ 15 pF GND 0.15 V 1.1 V – 1.6 V 2 kΩ 15 pF GND 0.1 V 0.65 V – 0.95 V 20 kΩ 15 pF GND 0.1 V VCCI(1) VCCI(1) Input A, B Input A, B VCCI / 2 VCCI / 2 100 kHz 500 ps/V ± 10 ns/V 0V tpd VOH(2) tpd VOH(2) Output B, A VCCI / 2 Output B, A Ensure Monotonic Rising and Falling Edge VCCI / 2 VOL(2) 1. 2. 0V VCCI is the supply pin associated with the input port. VOH and VOL are typical output voltage levels that occur with specified RL, CL, and S1 1. 2. VOL(2) VCCI is the supply pin associated with the input port. VOH and VOL are typical output voltage levels that occur with specified RL, CL, and S1 Figure 7. Input Transition Rise or Fall Rate Figure 6. Propagation Delay Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 19 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com VCCA OE VCCA / 2 VCCA / 2 GND tdis ten VCCO(3) Output(1) VCCO / 2 VOL + VTP VOL(4) VOH(4) VOH - VTP Output(2) VCCO / 2 GND (1) Output waveform on the condition that input is driven to a valid Logic Low. (2) Output waveform on the condition that input is driven to a valid Logic High. (3) VCCO is the supply pin associated with the output port. (4) VOH and VOL are typical output voltage levels with specified RL, CL, and S1. Figure 8. Enable Time and Disable Time 20 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 SN74AXCH4T245 www.ti.com SCES878 – MARCH 2019 8 Detailed Description 8.1 Overview The SN74AXCH4T245 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device with bushold inputs. xAx pins and control pins (1DIR, 2DIR, 1OE, and 2OE) are reference to VCCA logic levels, and xBx pins are referenced to VCCB logic levels. The A port is able to accept I/O voltages ranging from 0.65 V to 3.6 V, while the B port can accept I/O voltages from 0.65 V to 3.6 V. A high on DIR allows data transmission from A to B and a low on DIR allows data transmission from B to A when OE is set to low. When OE is set to high, both xAx and xBx pins are in the high-impedance state. See Device Functional Modes for a summary of the operation of the control logic. 8.2 Functional Block Diagram One of Two Transceiver Pairs VCCA VCCB xDIR xOE Bus-Hold xB1 xA1 Bus-Hold Bus-Hold xB2 xA2 Bus-Hold Note: Bus-hold circuits are only present for data inputs, not control inputs 8.3 Feature Description 8.3.1 Standard CMOS Inputs Standard CMOS inputs are high impedance and are typically modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics. The worst case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the maximum input leakage current, given in the Electrical Characteristics, using Ohm's law (R = V ÷ I). Signals applied to the inputs need to have fast edge rates, as defined by Δt/Δv in Recommended Operating Conditions to avoid excessive current consumption and oscillations. If a slow or noisy input signal is required, a device with a Schmitt-trigger input should be used to condition the input signal prior to the standard CMOS input. 8.3.2 Balanced High-Drive CMOS Push-Pull Outputs A balanced output allows the device to sink and source similar currents. The high drive capability of this device creates fast edges into light loads so routing and load conditions should be considered to prevent ringing. Additionally, the outputs of this device are capable of driving larger currents than the device can sustain without being damaged. The electrical and thermal limits defined in the Absolute Maximum Ratings must be followed at all times. Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Product Folder Links: SN74AXCH4T245 21 SN74AXCH4T245 SCES878 – MARCH 2019 www.ti.com Feature Description (continued) 8.3.3 Partial Power Down (Ioff) The inputs and outputs for this device enter a high-impedance state when the device is powered down, inhibiting current backflow into the device. The maximum leakage into or out of any input or output pin on the device is specified by Ioff in the Electrical Characteristics. 8.3.4 VCC Isolation The inputs and outputs for this device enter a high-impedance state when either supply is