SN74AXC4T245BQBR

SN74AXC4T245 SCES877A – DECEMBER 2018 – REVISED JULY 2020 SN74AXC4T245 Four-Bit Bus Transceiver with Configurable Voltage Translation and Tri-State Outputs 1 Features • • • • • • • • • • Fully Configurable Dual-Rail Design Allows Each Port to Operate With a Power Supply Range From 0.65 V to 3.6 V 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 – If Either VCC Input is Below 100 mV, All I/Os Outputs are Disabled and Become HighImpedance 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 Point of Sale 3 Description The SN74AXC4T245 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 also accepts any supply voltage from 0.65 V to 3.6 V. Additionally the SN74AXC4T245 is compatible with a single-supply system. The SN74AXC4T245 device is designed for asynchronous communication between data buses. The device 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 (1 OE and 2 OE) are used to disable the outputs so the buses are effectively isolated. The SN74AXC4T245 device is designed so the control pins (xDIR and x OE) are referenced to VCCA. To ensure the high-impedance state of the level shifter I/Os during power up or power down, the x OE 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 to 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, both I/O ports enter a high-impedance state by disabling their 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 PACKAGE(1) PART NUMBER BODY SIZE (NOM) SN74AXC4T245PW TSSOP (16) 5.00 mm x 4.40 mm SN74AXC4T245BQB WQFN (16) 2.50 mm x 3.50 mm SN74AXC4T245RSV UQFN (16) 2.60 mm x 1.80 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. One of Two Transceiver Pairs VCCA VCCB xDIR xOE xA1 xB1 xA2 xB2 Functional Block Diagram 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. SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 Table of Contents 1 Features............................................................................1 2 Applications..................................................................... 1 3 Description.......................................................................1 4 Revision History.............................................................. 2 5 Pin Configuration and Functions...................................3 6 Specifications.................................................................. 4 6.1 Absolute Maximum Ratings........................................ 4 6.2 ESD Ratings............................................................... 4 6.3 Recommended Operating Conditions.........................5 6.4 Thermal Information....................................................5 6.5 Electrical Characteristics.............................................6 6.6 Switching Characteristics, VCCA = 0.7 V..................... 7 6.7 Switching Characteristics, VCCA = 0.8 V..................... 7 6.8 Switching Characteristics, VCCA = 0.9 V..................... 8 6.9 Switching Characteristics, VCCA = 1.2 V..................... 9 6.10 Switching Characteristics, VCCA = 1.5 V................... 9 6.11 Switching Characteristics, VCCA = 1.8 V................. 10 6.12 Switching Characteristics, VCCA = 2.5 V................. 11 6.13 Switching Characteristics, VCCA = 3.3 V................. 11 6.14 Operating Characteristics: TA = 25°C..................... 13 7 Parameter Measurement Information.......................... 15 7.1 Load Circuit and Voltage Waveforms........................15 8 Detailed Description......................................................17 8.1 Overview................................................................... 17 8.2 Functional Block Diagram......................................... 17 8.3 Feature Description...................................................17 8.4 Device Functional Modes..........................................18 9 Application and Implementation.................................. 19 9.1 Application Information............................................. 19 9.2 Typical Application.................................................... 19 10 Power Supply Recommendations..............................21 11 Layout........................................................................... 21 11.1 Layout Guidelines................................................... 21 11.2 Layout Example...................................................... 21 12 Device and Documentation Support..........................22 12.1 Documentation Support.......................................... 22 12.2 Receiving Notification of Documentation Updates..22 12.3 Support Resources................................................. 22 12.4 Trademarks............................................................. 22 12.5 Electrostatic Discharge Caution..............................22 12.6 Glossary..................................................................22 13 Mechanical, Packaging, and Orderable Information.................................................................... 23 4 Revision History Changes from Revision * (December 2018) to Revision A (July 2020) Page • Updated the numbering format for tables, figures and cross-references throughout the document...................1 • Added BQB (WQFN) package option to Device Information table .................................................................... 1 2 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 VCCA VCCA 16 VCCB 5 Pin Configuration and Functions VCCB 15 1OE 1DIR 2 15 1OE 2DIR 3 14 2OE 2DIR 3 14 2OE 1A1 4 13 1B1 1A1 4 1A2 5 1B2 1A2 5 2B1 2A1 6 11 2B1 2A2 7 10 2B2 2A2 7 GND 8 10 9 2B2 GND 2OE 1B1 1B2 2B1 16 15 14 13 2B2 11 GND VCCA 3 10 GND 1DIR 4 9 2A2 6 7 8 2A1 12 2 1A2 1 1A1 1OE VCCB 2DIR 12 1B2 Figure 5-2. BQB Package 16-Pin WQFN Transparent Top View Figure 5-1. PW Package 16-Pin TSSOP Top View 5 13 1B1 GND 9 6 Thermal Pad GND 8 2A1 12 11 1 16 1DIR 1 2 Figure 5-3. RSV Package 16-Pin UQFN Transparent Top View Table 5-1. Pin Functions PIN NAME 1A1 NO. TYPE DESCRIPTION PW RSV BQB 4 6 4 I/O Input/output 1A1. Referenced to VCCA. 1A2 5 7 5 I/O Input/output 1A2. Referenced to VCCA. 1B1 13 15 13 I/O Input/output 1B1. Referenced to VCCB. 1B2 12 14 12 I/O Input/output 1B2. Referenced to VCCB. 1DIR 2 4 2 I Direction-control input for ‘1’ ports. 1 OE 15 1 15 I Tri-state output-mode enable. Pull OE high to place ‘1’ outputs in tri-state mode. Referenced to VCCA. 2A1 6 8 6 I/O Input/output 2A1. Referenced to VCCA. 2A2 7 9 7 I/O Input/output 2A2. Referenced to VCCA. 2B1 11 13 11 I/O Input/output 2B1. Referenced to VCCB. 2B2 10 12 10 I/O Input/output 2B2. Referenced to VCCB. 2DIR 3 5 3 I Direction-control input for ‘2’ ports. 2 OE 14 16 14 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 8, 9 — Ground. VCCA 1 3 1 — A-port power supply voltage. 0.65 V ≤ VCCA ≤ 3.6 V. VCCB 16 2 16 — B-port power supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 3 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)(1) MIN VCCA Supply voltage A VCCB Supply voltage B Input Voltage(2) VI 4.2 V V –0.5 4.2 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 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) MAX UNIT –0.5 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 Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted)(1) (2) 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 1.6 VCCI = 3 V - 3.6 V High-level input voltage Control Inputs(xDIR, x OE) Referenced to VCCA 2 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 1.6 VCCA = 3 V - 3.6 V Data Inputs VIL Low-level input voltage Control Inputs(xDIR, x OE) Referenced to VCCA V 2 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 (2) VO Output voltage Δt/Δv(2) Input transition rate TA Operating free-air temperature (1) (2) V 0.8 0 3.6 V Active State 0 VCCO Tri-State 0 3.6 10 ns/V –40 125 °C 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. 6.4 Thermal Information SN74AXC4T245 THERMAL METRIC(1) PW (TSSOP) RSV (UQFN) BQB (WQFN) 16 PINS 16 PINS 16 PINS UNIT RθJA Junction-to-ambient thermal resistance 126.9 130.1 73.0 °C/W RθJC(top) Junction-to-case (top) thermal resistance 49.3 70.3 35.1 °C/W RθJB Junction-to-board thermal resistance 74.3 57.4 42.8 °C/W ψJT Junction-to-top characterization parameter 8.1 4.6 4.6 °C/W ψJB Junction-to-board characterization parameter 73.4 55.8 42.8 °C/W RθJC(bottom) Junction-to-case (bottom) thermal resistance NA NA 10.2 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 5 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 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 VOH VOL II Low-level output VI = VIL voltage Input leakage current MIN TYP(4) UNIT MAX 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 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 Control inputs (xDIR, x OE): VI 0.65 V- 3.6 V = VCCA or GND 0.65 V- 3.6 V –0.5 0.5 –1 1 µA Data Inputs (xAx, xBx) VI = VCCI or GND 0.65 V- 3.6 V 0.65 V- 3.6 V –4 4 –8 8 µA 0V 0 V - 3.6 V –4 4 –8 8 0 V - 3.6 V 0V –4 4 –8 8 3.6 V 3.6 V –4 4 –8 8 0.65 V- 3.6 V 0.65 V- 3.6 V 0V 3.6 V 3.6 V 0V 0.65 V- 3.6 V 0.65 V- 3.6 V 0V 3.6 V 3.6 V 0V 0.65 V- 3.6 V 0.65 V- 3.6 V Partial power down current A or B Port VI or VO = 0 V - 3.6 V IOZ Tri-state output current (3) A or B Port VI = VCCI or GND, VO = VCCO or GND, OE = VIH ICCA VCCA supply current VI = VCCI or GND VCCB supply current –40°C to 125°C MAX VCCO – 0.1 IOH = –100 µA Ioff ICCB VI = VCCI or GND IO = 0 IO = 0 13 –2 µA 26 –12 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 3.3 V MHz -16 dBm sine wave 3.3 V 6.6 6.6 pF (1) (2) (3) (4) 6 High-level output VI = VIH voltage TYP(4) IO = 0 20 VCCI is the VCC associated with the input port. VCCO is the VCC associated with the output port. For I/O ports, the parameter IOZ includes the input leakage current. All typical data is taken at 25°C. Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 6.6 Switching Characteristics, VCCA = 0.7 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER tpd tdis FROM A B B A OE A OE B Propagation delay Disable time OE ten TO 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 1.8 ± 0.15 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 0.5 155 0.5 108 0.5 76 0.5 40 0.5 37 0.5 40 0.5 67 0.5 185 –40°C to 125°C 0.5 155 0.5 108 0.5 76 0.5 40 0.5 37 0.5 40 0.5 67 0.5 185 –40°C to 85°C 0.5 156 0.5 128 0.5 106 0.5 55 0.5 21 0.5 15 0.5 11 0.5 10 –40°C to 125°C 0.5 156 0.5 128 0.5 106 0.5 55 0.5 21 0.5 15 0.5 11 0.5 10 –40°C to 85°C 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 –40°C to 125°C 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 0.5 156 –40°C to 85°C 0.5 154 0.5 121 0.5 101 0.5 55 0.5 54 0.5 56 0.5 65 0.5 125 –40°C to 125°C 0.5 154 0.5 121 0.5 101 0.5 55 0.5 54 0.5 56 0.5 65 0.5 125 –40°C to 85°C 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 –40°C to 125°C 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 0.5 238 –40°C to 85°C 0.5 286 0.5 194 0.5 146 0.5 94 0.5 76 0.5 70 0.5 69 0.5 146 –40°C to 125°C 0.5 286 0.5 194 0.5 146 0.5 94 0.5 76 0.5 70 0.5 69 0.5 146 UNIT ns ns ns 6.7 Switching Characteristics, VCCA = 0.8 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable 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 1.8 ± 0.15 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 0.5 128 0.5 88 0.5 63 0.5 29 0.5 24 0.5 23 0.5 24 0.5 34 –40°C to 125°C 0.5 128 0.5 88 0.5 63 0.5 29 0.5 24 0.5 23 0.5 24 0.5 34 –40°C to 85°C 0.5 108 0.5 88 0.5 70 0.5 38 0.5 21 0.5 15 0.5 11 0.5 10 –40°C to 125°C 0.5 108 0.5 88 0.5 70 0.5 38 0.5 21 0.5 15 0.5 11 0.5 10 –40°C to 85°C 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 –40°C to 125°C 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 0.5 103 –40°C to 85°C 0.5 143 0.5 110 0.5 90 0.5 42 0.5 36 0.5 36 0.5 37 0.5 47 –40°C to 125°C 0.5 143 0.5 110 0.5 90 0.5 42 0.5 36 0.5 36 0.5 37 0.5 47 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 UNIT ns ns 7 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten TO 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 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 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 0.5 143 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 0.5 243 0.5 172 0.5 129 0.5 79 0.5 60 0.5 54 0.5 48 0.5 53 –40°C to 125°C 0.5 243 0.5 172 0.5 129 0.5 79 0.5 60 0.5 54 0.5 48 0.5 53 ns 6.8 Switching Characteristics, VCCA = 0.9 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis ten B Propagation delay B A OE A Disable time OE B OE A Enable time OE 8 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX –40°C to 85°C 0.5 106 0.5 70 0.5 53 0.5 24 0.5 18 0.5 17 0.5 16 0.5 19 –40°C to 125°C 0.5 106 0.5 70 0.5 53 0.5 24 0.5 18 0.5 17 0.5 16 0.5 19 –40°C to 85°C 0.5 76 0.5 63 0.5 53 0.5 27 0.5 18 0.5 13 0.5 10 0.5 9 –40°C to 125°C 0.5 76 0.5 63 0.5 53 0.5 27 0.5 18 0.5 13 0.5 10 0.5 9 –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 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 85°C 0.5 138 0.5 105 0.5 84 0.5 37 0.5 30 0.5 28 0.5 26 0.5 30 –40°C to 125°C 0.5 138 0.5 105 0.5 84 0.5 37 0.5 30 0.5 28 0.5 26 0.5 30 –40°C to 85°C 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 –40°C to 125°C 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 0.5 95 –40°C to 85°C 0.5 222 0.5 148 0.5 116 0.5 71 0.5 52 0.5 46 0.5 39 0.5 39 –40°C to 125°C 0.5 222 0.5 148 0.5 116 0.5 71 0.5 52 0.5 46 0.5 39 0.5 39 Submit Document Feedback ns ns ns Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 6.9 Switching Characteristics, VCCA = 1.2 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER tpd tdis FROM A B B A OE A OE B Propagation delay Disable time OE ten TO 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX –40°C to 85°C 0.5 55 0.5 37 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 55 0.5 37 0.5 27 0.5 15 0.5 11 0.5 10 0.5 8 0.5 9 –40°C to 85°C 0.5 41 0.5 29 0.5 24 0.5 15 0.5 10 0.5 9 0.5 7 0.5 6 –40°C to 125°C 0.5 41 0.5 29 0.5 24 0.5 15 0.5 10 0.5 9 0.5 7 0.5 6 –40°C to 85°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 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 0.5 132 0.5 99 0.5 79 0.5 31 0.5 24 0.5 21 0.5 18 0.5 18 –40°C to 125°C 0.5 132 0.5 99 0.5 79 0.5 31 0.5 24 0.5 21 0.5 18 0.5 18 –40°C to 85°C 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 –40°C to 125°C 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 0.5 45 –40°C to 85°C 0.5 164 0.5 108 0.5 79 0.5 58 0.5 41 0.5 35 0.5 27 0.5 24 –40°C to 125°C 0.5 164 0.5 108 0.5 79 0.5 58 0.5 41 0.5 35 0.5 27 0.5 24 ns ns ns 6.10 Switching Characteristics, VCCA = 1.5 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX –40°C to 85°C 0.5 21 0.5 21 0.5 18 0.5 11 0.5 9 0.5 8 0.5 7 0.5 6 –40°C to 125°C 0.5 21 0.5 21 0.5 18 0.5 11 0.5 9 0.5 8 0.5 7 0.5 6 –40°C to 85°C 0.5 37 0.5 24 0.5 18 0.5 11 0.5 9 0.5 8 0.5 5 0.5 5 –40°C to 125°C 0.5 37 0.5 24 0.5 18 0.5 11 0.5 9 0.5 8 0.5 5 0.5 5 –40°C to 85°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 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 97 0.5 77 0.5 29 0.5 21 0.5 19 0.5 15 0.5 15 –40°C to 125°C 0.5 131 0.5 97 0.5 77 0.5 29 0.5 21 0.5 19 0.5 15 0.5 15 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 ns ns 9 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten TO 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 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 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 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 –40°C to 125°C 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 0.5 26 –40°C to 85°C 0.5 109 0.5 84 0.5 68 0.5 47 0.5 35 0.5 29 0.5 22 0.5 20 –40°C to 125°C 0.5 109 0.5 84 0.5 68 0.5 47 0.5 35 0.5 29 0.5 22 0.5 20 ns 6.11 Switching Characteristics, VCCA = 1.8 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd tdis ten B Propagation delay B A OE A Disable time OE B OE A Enable time OE 10 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX –40°C to 85°C 0.5 15 0.5 15 0.5 13 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 –40°C to 125°C 0.5 15 0.5 15 0.5 13 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 –40°C to 85°C 0.5 40 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 40 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 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 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 0.5 130 0.5 96 0.5 76 0.5 28 0.5 21 0.5 18 0.5 15 0.5 14 –40°C to 125°C 0.5 130 0.5 96 0.5 76 0.5 28 0.5 21 0.5 18 0.5 15 0.5 14 –40°C to 85°C 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 –40°C to 125°C 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 0.5 20 –40°C to 85°C 0.5 102 0.5 75 0.5 62 0.5 41 0.5 32 0.5 27 0.5 20 0.5 18 –40°C to 125°C 0.5 102 0.5 75 0.5 62 0.5 41 0.5 32 0.5 27 0.5 20 0.5 18 Submit Document Feedback ns ns ns Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 6.12 Switching Characteristics, VCCA = 2.5 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER tpd tdis FROM A B B A OE A OE B Propagation delay Disable time OE ten TO 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT 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 5 0.5 5 0.5 5 0.5 5 –40°C to 125°C 0.5 11 0.5 11 0.5 11 0.5 7 0.5 5 0.5 5 0.5 5 0.5 5 –40°C to 85°C 0.5 67 0.5 24 0.5 16 0.5 8 0.5 7 0.5 6 0.5 5 0.5 4 –40°C to 125°C 0.5 67 0.5 24 0.5 16 0.5 8 0.5 7 0.5 6 0.5 5 0.5 4 –40°C to 85°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 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 95 0.5 76 0.5 27 0.5 20 0.5 17 0.5 13 0.5 13 –40°C to 125°C 0.5 128 0.5 95 0.5 76 0.5 27 0.5 20 0.5 17 0.5 13 0.5 13 –40°C to 85°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 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 70 0.5 56 0.5 36 0.5 26 0.5 22 0.5 18 0.5 16 –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 16 ns ns ns 6.13 Switching Characteristics, VCCA = 3.3 V See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM A tpd B Propagation delay B OE tdis TO A A Disable 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 1.8 ± 0.15 V 2.5 ± 0.2 V 3.3 ± 0.3 V UNIT MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX –40°C to 85°C 0.5 10 0.5 10 0.5 9 0.5 6 0.5 5 0.5 4 0.5 4 0.5 4 –40°C to 125°C 0.5 10 0.5 10 0.5 9 0.5 6 0.5 5 0.5 4 0.5 4 0.5 4 –40°C to 85°C 0.5 185 0.5 34 0.5 19 0.5 9 0.5 6 0.5 6 0.5 5 0.5 4 –40°C to 125°C 0.5 185 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 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 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 0.5 141 0.5 95 0.5 75 0.5 27 0.5 19 0.5 17 0.5 13 0.5 12 –40°C to 125°C 0.5 141 0.5 95 0.5 75 0.5 27 0.5 19 0.5 17 0.5 13 0.5 12 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 ns ns 11 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 See Figure 1 and Table 1 for test circuit and loading. See Figure 2, Figure 3, and Figure 4 for measurement waveforms. B-Port Supply Voltage (VCCB) PARAMETER FROM OE ten A Enable time OE 12 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 1.8 ± 0.15 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 11 0.5 11 0.5 11 0.5 11 0.5 11 0.5 11 –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 0.5 189 0.5 82 0.5 59 0.5 35 0.5 24 0.5 20 0.5 16 0.5 14 –40°C to 125°C 0.5 189 0.5 82 0.5 59 0.5 35 0.5 24 0.5 20 0.5 16 0.5 14 Submit Document Feedback UNIT ns Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 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) CpdA Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) TEST CONDITIONS VCCA VCCB MIN TYP 0.7 V 0.7 V 2.2 0.8 V 0.8 V 2.1 0.9 V 0.9 V 2.1 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 2.1 1.5 V 2.0 1.8 V 1.8 V 2.0 2.5 V 2.5 V 2.1 3.3 V 3.3 V 2.3 0.7 V 0.7 V 1.5 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.5 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 1.4 1.5 V 1.4 1.8 V 1.8 V 1.4 2.5 V 2.5 V 1.4 3.3 V 3.3 V 1.6 0.7 V 0.7 V 12.1 0.8 V 0.8 V 12.1 0.9 V 0.9 V 12.1 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 12.4 1.5 V 13.0 1.8 V 1.8 V 14.2 2.5 V 2.5 V 17.4 3.3 V 3.3 V 20.1 0.7 V 0.7 V 1.1 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.1 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 1.1 1.5 V 1.1 1.8 V 1.8 V 1.1 2.5 V 2.5 V 1.1 3.3 V 3.3 V 1.1 MAX UNIT pF pF pF pF Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 13 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 PARAMETER Power Dissipation Capacitance per transceiver (A to B: outputs enabled) Power Dissipation Capacitance per transceiver (A to B: outputs disabled) CpdB Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) 14 TEST CONDITIONS VCCA VCCB MIN TYP 0.7 V 0.7 V 12.1 0.8 V 0.8 V 12.1 0.9 V 0.9 V 12.1 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 12.4 1.5 V 12.9 1.8 V 1.8 V 14.1 2.5 V 2.5 V 17.2 3.3 V 3.3 V 20.1 0.7 V 0.7 V 1.1 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.1 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 1.1 1.5 V 1.1 1.8 V 1.8 V 1.1 2.5 V 2.5 V 1.1 3.3 V 3.3 V 1.1 0.7 V 0.7 V 1.2 0.8 V 0.8 V 1.8 0.9 V 0.9 V 1.8 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 1.7 1.5 V 1.7 1.8 V 1.8 V 1.7 2.5 V 2.5 V 2 3.3 V 3.3 V 2.5 0.7 V 0.7 V 1.1 0.8 V 0.8 V 1.8 0.9 V 0.9 V 1.8 CL = 0, RL = Open f = 1 1.2 V MHz, tr = tf = 1 ns 1.5 V 1.2 V 1.7 1.5 V 1.7 1.8 V 1.8 V 1.7 2.5 V 2.5 V 2 3.3 V 3.3 V 2.1 Submit Document Feedback MAX UNIT pF pF pF pF Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 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) A. RL CL includes probe and jig capacitance. Figure 7-1. Load Circuit Table 7-1. Load Circuit Conditions Δt/Δv tpd Parameter VCCO RL CL S1 VTP 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 0.65 V – 0.95 V 20 kΩ 15 pF Open N/A Propagation (delay) time 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 / 2 500 ps/V ± 100 ns/V 0V tpd VCCI / 2 Output B, A VCCI / 2 VOL(2) 1. 2. 0V VOH(2) tpd VOH(2) Output B, A 100 kHz 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. Ensure Monotonic Rising and Falling Edge 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 7-3. Input Transition Rise or Fall Rate Figure 7-2. Propagation Delay Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 15 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 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 A. B. C. D. Output waveform on the condition that input is driven to a valid Logic Low. Output waveform on the condition that input is driven to a valid Logic High. VCCO is the supply pin associated with the output port. VOH and VOL are typical output voltage levels with specified RL, CL, and S1. Figure 7-4. Enable Time And Disable Time 16 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: SN74AXC4T245 SN74AXC4T245 www.ti.com SCES877A – DECEMBER 2018 – REVISED JULY 2020 8 Detailed Description 8.1 Overview The SN74AXC4T245 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device. Ax pins and control pins (1DIR, 2DIR,1 OE, and 2 OE) are referenced to VCCA logic levels, and Bx 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 Ax and Bx 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 xA1 xB1 xA2 xB2 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. 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