SN74AXC4T774BQBR

SN74AXC4T774 SCES898B – JULY 2019 –SN74AXC4T774 REVISED MAY 2021 SCES898B – JULY 2019 – REVISED MAY 2021 www.ti.com SN74AXC4T774 4-Bit Dual-Supply Bus Transceiver with Independent Direction Control, 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 Independent direction control pins to allow configurable up and down translation Glitch-free power supply sequencing Up to 310 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 SN74AXC4T774 is a four-bit non-inverting 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 SN74AXC4T774 is compatible with a single-supply system. The SN74AXC4T774 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 (DIRx). The output-enable input ( OE) is used to disable the outputs so the buses are effectively isolated. The SN74AXC4T774 device is designed so the control pins (DIRx and OE) are referenced to VCCA. To ensure the high-impedance state of the level shifter I/Os during power up or power down, the OE pin 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 are set to the 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 PART NUMBER PACKAGE(1) BODY SIZE (NOM) SN74AXC4T774PW TSSOP (16) 5.00 mm x 4.40 mm SN74AXC4T774BQB WQFN (16) 2.50 mm x 3.50 mm SN74AXC4T774RSV 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 Four Transceivers VCCA VCCB DIRx OE Bx Ax Functional Block Diagram An©IMPORTANT NOTICEIncorporated at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, Copyright 2021 Texas Instruments Submit Document Feedback intellectual property matters and other important disclaimers. PRODUCTION DATA. Product Folder Links: SN74AXC4T774 1 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 ± 0.05 V.......... 7 6.7 Switching Characteristics, VCCA = 0.8 ± 0.04 V.......... 7 6.8 Switching Characteristics, VCCA = 0.9 ± 0.045 V........ 8 6.9 Switching Characteristics, VCCA = 1.2 ± 0.1 V............ 9 6.10 Switching Characteristics, VCCA = 1.5 ± 0.1 V.......... 9 6.11 Switching Characteristics, VCCA = 1.8 ± 0.15 V...... 10 6.12 Switching Characteristics, VCCA = 2.5 ± 0.2 V........ 11 6.13 Switching Characteristics, VCCA = 3.3 ± 0.3 V........ 11 6.14 Operating Characteristics: TA = 25°C..................... 13 6.15 Typical Characteristics............................................ 15 7 Parameter Measurement Information.......................... 16 7.1 Load Circuit and Voltage Waveforms........................16 8 Detailed Description......................................................18 8.1 Overview................................................................... 18 8.2 Functional Block Diagram......................................... 18 8.3 Feature Description...................................................18 8.4 Device Functional Modes..........................................19 9 Application and Implementation.................................. 20 9.1 Application Information............................................. 20 9.2 Typical Application.................................................... 20 10 Power Supply Recommendations..............................22 11 Layout........................................................................... 22 11.1 Layout Guidelines................................................... 22 11.2 Layout Example...................................................... 22 12 Device and Documentation Support..........................23 12.1 Related Documentation.......................................... 23 12.2 Receiving Notification of Documentation Updates..23 12.3 Support Resources................................................. 23 12.4 Trademarks............................................................. 23 12.5 Electrostatic Discharge Caution..............................23 12.6 Glossary..................................................................23 13 Mechanical, Packaging, and Orderable Information.................................................................... 23 4 Revision History Changes from Revision A (July 2020) to Revision B (May 2021) Page • Updated the Serial Peripheral Interface (SPI) Application figure in the Typical Application section................. 20 Changes from Revision * (July 2019) 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 © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 DIR1 DIR1 15 VCCA VCCB A1 3 14 B1 A1 3 A2 4 13 B2 A2 4 A3 5 12 11 B3 A3 5 A4 6 1 1 2 16 DIR2 16 VCCA 5 Pin Configuration and Functions DIR2 2 15 VCCB 14 B1 13 B2 Thermal Pad 12 B3 A4 6 B4 11 B4 DIR3 7 8 10 GND OE Figure 5-2. BQB Package 16-Pin WQFN Transparent Top View DIR2 DIR1 VCCA VCCB Figure 5-1. PW Package 16-Pin TSSOP Top View 16 15 14 13 12 B1 A2 2 11 B2 A3 3 10 B3 A4 4 9 B4 DIR3 DIR4 6 7 8 OE 1 GND A1 5 9 DIR4 GND 10 9 OE 7 DIR4 8 DIR3 Figure 5-3. RSV Package 16-Pin UQFN Transparent Top View Pin Functions PIN NAME NO. TYPE DESCRIPTION PW RSV BQB A1 3 1 3 I/O A2 4 2 4 I/O Input/output A2. Referenced to VCCA. A3 5 3 5 I/O Input/output A3. Referenced to VCCA. Input/output A1. Referenced to VCCA. A4 6 4 6 I/O Input/output A4. Referenced to VCCA. B1 14 12 14 I/O Input/output B1. Referenced to VCCB. B2 13 11 13 I/O Input/output B2. Referenced to VCCB. B3 12 10 12 I/O Input/output B3. Referenced to VCCB. B4 11 9 11 I/O Input/output B4. Referenced to VCCB. DIR1 1 15 1 I Direction-control input for port 1. Referenced to VCCA. DIR2 2 16 2 I Direction-control input for port 2. Referenced to VCCA. DIR3 7 5 7 I Direction-control input for port 3. Referenced to VCCA. DIR4 8 6 8 I Direction-control input for port 4. Referenced to VCCA. OE 9 7 9 I Tri-state output enable. Pull OE high to place all outputs in tri-state mode. Referenced to VCCA. GND 10 8 10 — Ground VCCA 16 14 16 — A-port power supply voltage. 0.65 V ≤ VCCA ≤ 3.6 V VCCB 15 13 15 — B-port power supply voltage. 0.65 V ≤ VCCB ≤ 3.6 V Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 3 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 –0.5 Input Voltage(2) VI 4.2 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 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 Storage temperature V –0.5 VO Tstg V –0.5 Voltage applied to any output in the high-impedance or power-off state(2) Junction Temperature 4.2 I/O Ports (A Port) VO Tj MAX UNIT V V V mA mA –50 50 mA –100 100 mA 150 °C 150 °C –65 (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress (2) (3) 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 © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted)(1) (2) MIN MAX 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 VCCA = 0.65 V - 0.75 V Control Inputs(DIRx, OE), Referenced to VCCA 2 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(DIRx, OE), Referenced to VCCA 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 Output voltage 0 3.6 Active State 0 VCCO Tri-State 0 3.6 10 ns/V –40 125 °C Δt/Δv(2) Input transition rise and fall time TA Operating free-air temperature (1) (2) 0.8 Input voltage (1) VO V 0.7 VCCA = 3 V - 3.6 V VI UNIT 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 SN74AXC4T774 THERMAL METRIC(1) PW (TSSOP) RSV (UQFN) BQB (WQFN) 16 PINS 16 PINS 16 PINS UNIT RθJA Junction-to-ambient thermal resistance 118.2 130.8 73.7 °C/W RθJC(top) Junction-to-case (top) thermal resistance 48.6 69.1 70.9 °C/W RθJB Junction-to-board thermal resistance 64.5 59.9 43.5 °C/W YJT Junction-to-top characterization parameter 7.3 3.9 4.9 °C/W YJB Junction-to-board characterization parameter 63.9 58.3 43.5 °C/W RθJC(bottom) Junction-to-case (bottom) thermal resistance NA NA 21.2 °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 © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 5 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 6.5 Electrical Characteristics over operating free-air temperature range (unless otherwise noted) (1) (2) Operating free-air temperature (TA) PARAMETER TEST CONDITIONS VCCA -40°C to 85°C VCCB MIN TYP(4) VOH VOL II Low-level output VI = VIL voltage Input leakage current 0.7 V - 3.6 V 0.7 V - 3.6 V MIN TYP(4) VCCO – 0.1 VCCO – 0.1 UNIT MAX IOH = -50 µA 0.65 V 0.65 V 0.55 0.55 IOH = -200 µA 0.76 V 0.76 V 0.58 0.58 IOH = -500 µA 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 0.18 2.3 V 2.3 IOL = 200 µA 0.76 V 0.76 V 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 0.65 V- 3.6 V –0.5 0.5 –1 1 µA Data Inputs (Ax, Bx),VI = VCCI or GND 0.65 V- 3.6 V 0.65 V- 3.6 V –4 4 –8 8 µA Partial power down current A Port: VI or VO = 0 V - 3.6 V 0V 0 V - 3.6 V –4 4 –8 8 B Port: VI or VO = 0 V - 3.6 V 0 V - 3.6 V 0V –4 4 –8 8 IOZ Tri-state output current (3) A or B Port, VI = VCCI or GND, 3.6 V VO = VCCO or GND, OE = VIH 3.6 V –4 4 –8 8 ICCA VCCA supply current VI = VCCI or GND VCCB supply current V Control inputs (DIRx, OE):VI = 0.65 V- 3.6 V VCCA or GND Ioff ICCB VI = VCCI or GND IO = 0 IO = 0 0.65 V- 3.6 V 0.65 V- 3.6 V 0V 3.6 V 15 3.6 V 0V 10 18 0.65 V- 3.6 V 0.65 V- 3.6 V 15 27 0V 3.6 V 10 3.6 V 0V 0.65 V- 3.6 V 0.65 V- 3.6 V –2 µA 27 –12 –2 µA µA 18 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 6.5 6.5 pF (1) (2) (3) (4) 6 High-level output VI = VIH voltage IOH = -100 µA -40°C to 125°C MAX IO = 0 21 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 © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 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 0.5 172 0.5 120 0.5 88 0.5 51 0.5 46 0.5 56 0.5 78 0.5 221 -40°C to 125°C 0.5 172 0.5 120 0.5 88 0.5 51 0.5 46 0.5 56 0.5 78 0.5 221 -40°C to 85°C 0.5 172 0.5 141 0.5 109 0.5 51 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 125°C 0.5 172 0.5 141 0.5 109 0.5 51 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 -40°C to 125°C 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 0.5 205 -40°C to 85°C 0.5 189 0.5 161 0.5 145 0.5 102 0.5 99 0.5 102 0.5 113 0.5 176 -40°C to 125°C 0.5 189 0.5 161 0.5 145 0.5 102 0.5 99 0.5 102 0.5 113 0.5 176 -40°C to 85°C 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 -40°C to 125°C 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 0.5 287 -40°C to 85°C 0.5 309 0.5 219 0.5 177 0.5 133 0.5 127 0.5 132 0.5 165 0.5 418 -40°C to 125°C 0.5 309 0.5 219 0.5 177 0.5 133 0.5 127 0.5 132 0.5 165 0.5 418 ns ns ns 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 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 0.5 141 0.5 96 0.5 73 0.5 39 0.5 29 0.5 28 0.5 29 0.5 40 -40°C to 125°C 0.5 141 0.5 96 0.5 73 0.5 39 0.5 29 0.5 28 0.5 29 0.5 40 -40°C to 85°C 0.5 120 0.5 96 0.5 76 0.5 39 0.5 16 0.5 11 0.5 9 0.5 9 -40°C to 125°C 0.5 120 0.5 96 0.5 76 0.5 39 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 -40°C to 125°C 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 0.5 114 -40°C to 85°C 0.5 156 0.5 131 0.5 116 0.5 71 0.5 67 0.5 68 0.5 70 0.5 84 -40°C to 125°C 0.5 156 0.5 131 0.5 116 0.5 71 0.5 67 0.5 68 0.5 70 0.5 84 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 7 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 OE ten TO -40°C to 85°C A Enable time OE Test Conditions B 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 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 -40°C to 125°C 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 0.5 161 -40°C to 85°C 0.5 258 0.5 174 0.5 137 0.5 90 0.5 73 0.5 71 0.5 77 0.5 106 -40°C to 125°C 0.5 258 0.5 174 0.5 137 0.5 90 0.5 73 0.5 71 0.5 77 0.5 106 ns 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 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 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 0.5 109 0.5 76 0.5 60 0.5 33 0.5 23 0.5 21 0.5 21 0.5 24 -40°C to 125°C 0.5 109 0.5 76 0.5 60 0.5 33 0.5 23 0.5 21 0.5 21 0.5 24 -40°C to 85°C 0.5 88 0.5 73 0.5 60 0.5 33 0.5 16 0.5 11 0.5 9 0.5 9 -40°C to 125°C 0.5 88 0.5 73 0.5 60 0.5 33 0.5 16 0.5 12 0.5 9 0.5 9 -40°C to 85°C 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 -40°C to 125°C 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 0.5 83 -40°C to 85°C 0.5 138 0.5 112 0.5 97 0.5 51 0.5 46 0.5 46 0.5 46 0.5 54 -40°C to 125°C 0.5 138 0.5 112 0.5 97 0.5 51 0.5 46 0.5 46 0.5 46 0.5 54 -40°C to 85°C 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 -40°C to 125°C 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 0.5 94 -40°C to 85°C 0.5 203 0.5 140 0.5 110 0.5 70 0.5 52 0.5 45 0.5 43 0.5 51 -40°C to 125°C 0.5 203 0.5 140 0.5 110 0.5 74 0.5 54 0.5 47 0.5 43 0.5 51 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 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 50 0.5 39 0.5 33 0.5 20 0.5 14 0.5 12 0.5 10 0.5 12 -40°C to 125°C 0.5 50 0.5 39 0.5 33 0.5 20 0.5 14 0.5 12 0.5 10 0.5 12 -40°C to 85°C 0.5 51 0.5 39 0.5 33 0.5 20 0.5 15 0.5 11 0.5 8 0.5 7 -40°C to 125°C 0.5 51 0.5 39 0.5 33 0.5 20 0.5 15 0.5 12 0.5 8 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 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 0.5 29 -40°C to 85°C 0.5 123 0.5 95 0.5 78 0.5 33 0.5 26 0.5 25 0.5 23 0.5 26 -40°C to 125°C 0.5 124 0.5 95 0.5 79 0.5 34 0.5 27 0.5 26 0.5 24 0.5 26 -40°C to 85°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 125°C 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 0.5 40 -40°C to 85°C 0.5 124 0.5 87 0.5 70 0.5 51 0.5 38 0.5 33 0.5 26 0.5 25 -40°C to 125°C 0.5 124 0.5 87 0.5 70 0.5 55 0.5 42 0.5 36 0.5 28 0.5 26 ns ns ns 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 B Propagation delay B OE tdis TO A A Disable time OE B Test Conditions -40°C to 85°C 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 0.5 16 0.5 16 0.5 16 0.5 15 0.5 11 0.5 10 0.5 8 0.5 10 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 15 0.5 11 0.5 10 0.5 8 0.5 10 -40°C to 85°C 0.5 47 0.5 29 0.5 23 0.5 14 0.5 11 0.5 9 0.5 7 0.5 6 -40°C to 125°C 0.5 47 0.5 29 0.5 23 0.5 14 0.5 11 0.5 9 0.5 7 0.5 6 -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 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 0.5 120 0.5 91 0.5 74 0.5 29 0.5 22 0.5 20 0.5 20 0.5 20 -40°C to 125°C 0.5 120 0.5 92 0.5 75 0.5 30 0.5 23 0.5 22 0.5 19 0.5 20 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 9 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 OE ten TO -40°C to 85°C A Enable time OE Test Conditions B 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 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 0.5 24 -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 28 0.5 29 0.5 33 0.5 41 0.5 31 0.5 27 0.5 22 0.5 19 -40°C to 125°C 0.5 29 0.5 30 0.5 33 0.5 42 0.5 33 0.5 29 0.5 24 0.5 21 ns 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 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 MIN MAX MIN -40°C to 85°C 0.5 12 -40°C to 125°C 0.5 12 -40°C to 85°C 0.5 -40°C to 125°C 0.9 ± 0.045 V MAX MIN 0.5 11 0.5 12 56 0.5 0.5 56 -40°C to 85°C 0.5 -40°C to 125°C 0.5 -40°C to 85°C 1.2 ± 0.1 V MAX MIN 0.5 11 0.5 12 28 0.5 0.5 28 17 0.5 18 0.5 0.5 117 -40°C to 125°C 0.5 -40°C to 85°C -40°C to 125°C 1.5 ± 0.1 V 1.8 ± 0.15 V 2.5 ± 0.2 V UNIT 3.3 ± 0.3 V MAX MIN MAX MIN MAX MIN MAX MIN MAX 0.5 11 0.5 9 0.5 8 0.5 7 0.5 7 0.5 12 0.5 9 0.5 9 0.5 7 0.5 7 21 0.5 12 0.5 10 0.5 8 0.5 6 0.5 5 0.5 21 0.5 12 0.5 10 0.5 9 0.5 7 0.5 6 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 0.5 17 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 18 0.5 90 0.5 73 0.5 28 0.5 21 0.5 19 0.5 16 0.5 18 119 0.5 90 0.5 74 0.5 29 0.5 22 0.5 20 0.5 17 0.5 18 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 0.5 19 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 21 0.5 20 0.5 20 0.5 32 0.5 27 0.5 24 0.5 20 0.5 18 -40°C to 125°C 0.5 22 0.5 22 0.5 22 0.5 34 0.5 29 0.5 26 0.5 22 0.5 19 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 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 10 0.5 10 0.5 9 0.5 8 0.5 7 0.5 6 0.5 6 0.5 6 -40°C to 125°C 0.5 10 0.5 10 0.5 9 0.5 8 0.5 7 0.5 7 0.5 6 0.5 6 -40°C to 85°C 0.5 78 0.5 30 0.5 21 0.5 10 0.5 8 0.5 7 0.5 6 0.5 5 -40°C to 125°C 0.5 78 0.5 30 0.5 21 0.5 10 0.5 8 0.5 7 0.5 6 0.5 5 -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 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 -40°C to 85°C 0.5 115 0.5 89 0.5 72 0.5 26 0.5 19 0.5 18 0.5 14 0.5 17 -40°C to 125°C 0.5 117 0.5 89 0.5 72 0.5 28 0.5 21 0.5 19 0.5 15 0.5 17 -40°C to 85°C 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 0.5 14 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 85°C 0.5 15 0.5 14 0.5 13 0.5 14 0.5 15 0.5 16 0.5 15 0.5 15 -40°C to 125°C 0.5 16 0.5 15 0.5 15 0.5 16 0.5 17 0.5 18 0.5 17 0.5 16 ns ns ns 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 B Propagation delay B OE tdis TO A A Disable time OE B Test Condtions -40°C to 85°C 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 0.5 10 0.5 9 0.5 9 0.5 8 0.5 6 0.5 6 0.5 5 0.5 5 -40°C to 125°C 0.5 10 0.5 9 0.5 9 0.5 8 0.5 6 0.5 6 0.5 5 0.5 5 -40°C to 85°C 0.5 221 0.5 40 0.5 24 0.5 12 0.5 10 0.5 7 0.5 6 0.5 5 -40°C to 125°C 0.5 221 0.5 40 0.5 24 0.5 12 0.5 10 0.5 7 0.5 6 0.5 5 -40°C to 85°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 125°C 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 0.5 16 -40°C to 85°C 0.5 115 0.5 89 0.5 72 0.5 26 0.5 19 0.5 17 0.5 14 0.5 16 -40°C to 125°C 0.5 117 0.5 89 0.5 72 0.5 27 0.5 20 0.5 18 0.5 14 0.5 16 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 ns ns 11 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 OE ten A Enable time OE 12 TO B Test Condtions -40°C to 85°C 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 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 13 0.5 12 0.5 11 0.5 11 0.5 11 0.5 12 0.5 12 0.5 12 -40°C to 125°C 0.5 14 0.5 12 0.5 12 0.5 12 0.5 12 0.5 13 0.5 13 0.5 13 Submit Document Feedback UNIT ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CpdA 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 trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 2.4 0.8 V 0.8 V 2.3 0.9 V 0.9 V 2.2 1.2 V 1.2 V 2.2 1.5 V 1.5 V 2.2 1.8 V 1.8 V 2.2 2.5 V 2.5 V 2.4 3.3 V 3.3 V 3.0 0.7 V 0.7 V 1.5 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.5 1.2 V 1.2 V 1.5 1.5 V 1.5 V 1.5 1.8 V 1.8 V 1.5 2.5 V 2.5 V 1.6 3.3 V 3.3 V 2.0 0.7 V 0.7 V 13.4 0.8 V 0.8 V 15.0 0.9 V 0.9 V 14.0 1.2 V 1.2 V 20.7 1.5 V 1.5 V 29.6 1.8 V 1.8 V 40.2 2.5 V 2.5 V 65.8 3.3 V 3.3 V 91.7 0.7 V 0.7 V 1.3 0.8 V 0.8 V 1.1 0.9 V 0.9 V 1.1 1.2 V 1.2 V 1.0 1.5 V 1.5 V 1.0 1.8 V 1.8 V 1.0 2.5 V 2.5 V 1.0 3.3 V 3.3 V 1.0 MAX UNIT pF pF pF pF Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 13 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CpdB Power Dissipation Capacitance per transceiver (B to A: outputs enabled) Power Dissipation Capacitance per transceiver (B to A: outputs disabled) 14 CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns CL = 0, RL = Open f = 1 MHz trise = tfall = 1 ns VCCA VCCB MIN TYP 0.7 V 0.7 V 13.4 0.8 V 0.8 V 13.8 0.9 V 0.9 V 14.9 1.2 V 1.2 V 20.6 1.5 V 1.5 V 29.6 1.8 V 1.8 V 40.3 2.5 V 2.5 V 66.2 3.3 V 3.3 V 92.5 0.7 V 0.7 V 1.3 0.8 V 0.8 V 1.2 0.9 V 0.9 V 1.1 1.2 V 1.2 V 1.1 1.5 V 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 2.5 0.8 V 0.8 V 2.4 0.9 V 0.9 V 2.3 1.2 V 1.2 V 2.2 1.5 V 1.5 V 2.3 1.8 V 1.8 V 2.3 2.5 V 2.5 V 2.5 3.3 V 3.3 V 3.0 0.7 V 0.7 V 1.6 0.8 V 0.8 V 1.5 0.9 V 0.9 V 1.5 1.2 V 1.2 V 1.5 1.5 V 1.5 V 1.5 1.8 V 1.8 V 1.5 2.5 V 2.5 V 1.6 3.3 V 3.3 V 2.0 Submit Document Feedback MAX UNIT pF pF pF pF Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 0 2 4 6 8 10 12 IOH (mA) 14 16 18 VCC = 0.7V VCC = 1.2V 0 20 0.5 1 1.5 2 D001 Figure 6-1. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) 2.5 3 IOH (mA) 3.5 4 4.5 5 D001 Figure 6-2. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) 220 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 -50 200 180 160 140 VOL (mV) VOL (mV) 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 0.55 120 100 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 6-3. Typical (TA=25°C) Output High Voltage (VOL) vs Sink Current (IOL) 1 1.5 2 2.5 3 IOL (mA) 3.5 4 4.5 5 D001 Figure 6-4. Typical (TA=25°C) Output High Voltage (VOL) vs Sink Current (IOL) Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 15 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 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 CL S1 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 VCCI / 2 Output B, A Ensure Monotonic Rising and Falling Edge VCCI / 2 VOL(2) 1. 2. 0V VOH(2) tpd VOH(2) Output B, A 100 kHz 500 ps/V ± 10 ns/V 0V tpd VTP 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 7-3. Input Transition Rise or Fall Rate Figure 7-2. Propagation Delay 16 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 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 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: SN74AXC4T774 17 SN74AXC4T774 www.ti.com SCES898B – JULY 2019 – REVISED MAY 2021 8 Detailed Description 8.1 Overview The SN74AXC4T774 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device. Ax pins and control pins (DIRx and OE) are reference 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 Four Transceivers VCCA VCCB DIRx OE Bx Ax 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