TXU0104RUTR

TXU0104 SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 TXU0104 4-Bit Fixed Direction Voltage-Level Translator with Schmitt-Trigger Inputs and 3-State Outputs 1 Features 2 Applications • • • • • • • • • • • • • • • • • • • Fully configurable dual-rail design allows each port to operate from 1.1 V to 5.5 V Up to 200 Mbps support for 3.3 V to 5.0 V Schmitt-trigger inputs allows for slow and noisy inputs Inputs with integrated static pull-down resistors prevent channels from floating High drive strength (up to 12 mA at 5 V) Low power consumption – 2.5 µA maximum (25°C) – 6 µA maximum (–40°C to 125°C) VCC isolation and VCC disconnect (Ioff-float) feature – If either VCC input is 0.7*VCCO 20% of pulse < 0.3*VCCO Up Translation Down Translation Up Translation tsk - Output skew Timing skew between any switching outputs on the rising or falling edge Down Translation TYP UNIT MAX 3.0 V - 3.6 V 4.5 V - 5.5 V 200 1.65 V - 1.95 V 4.5 V - 5.5 V 150 1.1 V - 1.3 V 4.5 V - 5.5 V 30 1.65 V - 1.95 V 3.0 V - 3.6 V 100 1.1 V - 1.3 V 3.0 V - 3.6 V 30 1.1 V - 1.3 V 1.65 V - 1.95 V 20 4.5 V - 5.5 V 3.0 V - 3.6 V 4.5 V - 5.5 V 1.65 V - 1.95 V 50 4.5 V - 5.5 V 1.1 V - 1.3 V 10 3.0 V - 3.6 V 1.65 V - 1.95 V 50 3.0 V - 3.6 V 1.1 V - 1.3 V 10 1.65 V - 1.95 V 1.1 V - 1.3 V 10 3.0 V - 3.6 V 4.5 V - 5.5 V 3 1.65 V - 1.95 V 4.5 V - 5.5 V 10 1.1 V - 1.3 V 4.5 V - 5.5 V 42 1.65 V - 1.95 V 3.0 V - 3.6 V 8 1.1 V - 1.3 V 3.0 V - 3.6 V 42 1.1 V - 1.3 V 1.65 V - 1.95 V 45 4.5 V - 5.5 V 3.0 V - 3.6 V 4.5 V - 5.5 V 1.65 V - 1.95 V 10 4.5 V - 5.5 V 1.1 V - 1.3 V 42 3.0 V - 3.6 V 1.65 V - 1.95 V 3.0 V - 3.6 V 1.1 V - 1.3 V 42 1.65 V - 1.95 V 1.1 V - 1.3 V 45 Mbps 125 3 ns 8 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 9 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.7 Switching Characteristics, VCCA = 1.2 ± 0.1 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten Enable time OE 10 A B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 3.3 96 0.5 43 0.5 37 0.5 32 0.5 30 0.5 31 -40°C to 125°C 5.7 60 3.0 39 1.4 33 0.5 28 0.5 27 0.5 26 -40°C to 85°C 3.3 95 1.9 80 0.5 75 0.5 70 0.5 69 0.5 69 -40°C to 125°C 5.7 60 4.1 51 2.9 48 1.8 45 1.5 44 1.3 44 -40°C to 85°C 28.8 133 28.5 130 28.4 133 28.8 137 28.4 143 18.7 211 -40°C to 125°C 43.3 133 43.3 130 43.7 130 44.7 131 45.4 134 31.8 140 -40°C to 85°C 32.5 150 27.6 117 25.8 110 22.5 104 22.1 112 20.1 181 -40°C to 125°C 48.3 149 43.2 120 40.8 113 36.8 104 36.5 107 33.8 111 -40°C to 85°C 24.1 237 22.1 229 21.4 230 21.3 232 21.7 235 22.7 244 -40°C to 125°C 34.9 156 33.3 167 32.0 169 31.7 173 32.0 177 34.2 187 -40°C to 85°C 21.3 237 14.3 152 11.2 140 130 130 8.4 132 -40°C to 125°C 29.8 143 23.0 116 18.6 107 15.4 97 14.8 103 Submit Document Feedback 8.8 8.2 97 14.5 ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.8 Switching Characteristics, VCCA = 1.5 ± 0.1 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten A Enable time OE B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 1.9 80 0.5 31 0.5 25 0.5 19 0.5 17 0.5 15 -40°C to 125°C 4.1 51 1.6 31 0.5 25 0.5 20 0.5 18 0.5 16 -40°C to 85°C 0.5 43 0.5 31 0.5 28 0.5 26 0.5 25 0.5 24 -40°C to 125°C 3.0 39 1.6 31 0.5 28 0.5 26 0.5 25 0.5 24 -40°C to 85°C 20.0 91 19.0 82 18.8 81 19.2 82 19.6 83 12.2 87 -40°C to 125°C 34.9 95 32.6 86 32.8 85 33.4 87 34.2 88 24.6 92 -40°C to 85°C 27.4 127 21.7 91 19.9 82 16.3 71 15.9 71 13.7 70 -40°C to 125°C 44.4 130 36.7 95 34.7 86 30.2 75 29.8 75 26.6 74 -40°C to 85°C 14.9 102 14.4 86 13.5 88 12.7 90 12.6 92 13.2 97 100 -40°C to 125°C 25.5 102 25.2 89 24.1 91 22.8 93 22.8 96 23.5 -40°C to 85°C 17.9 175 12.7 80 69 57 53 -40°C to 125°C 26.6 135 21.0 81 16.8 9.1 6.1 71 12.5 4.9 60 10.8 4.5 54 56 10.4 57 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 ns ns ns 11 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.9 Switching Characteristics, VCCA = 1.8 ± 0.15 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten Enable time OE 12 A B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 0.5 75 0.5 28 0.5 22 0.5 17 0.5 14 0.5 12 -40°C to 125°C 2.9 48 0.5 28 0.5 23 0.5 17 0.5 15 0.5 13 -40°C to 85°C 0.5 37 0.5 25 0.5 22 0.5 19 0.5 19 0.5 18 -40°C to 125°C 1.4 33 0.5 25 0.5 23 0.5 20 0.5 19 0.5 19 -40°C to 85°C 17.2 79 14.7 67 14.5 65 14.3 65 14.4 66 8.5 68 -40°C to 125°C 30.9 83 28.0 71 26.6 69 27.5 70 27.2 71 20.0 73 -40°C to 85°C 25.4 121 18.7 81 16.5 71 12.8 60 12.5 58 9.8 55 -40°C to 125°C 41.7 123 34.0 86 30.3 76 26.2 64 25.3 62 21.8 59 -40°C to 85°C 10.9 66 63 65 66 8.1 69 88 9.5 9.4 8.6 8.2 -40°C to 125°C 20.3 87 19.0 69 18.9 67 17.6 68 17.1 70 17.1 73 -40°C to 85°C 16.7 177 10.4 75 58 4.9 46 3.3 42 2.2 39 -40°C to 125°C 25.1 135 18.7 77 15.5 60 11.0 49 8.7 44 7.3 42 8.1 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.10 Switching Characteristics, VCCA = 2.5 ± 0.2 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten A Enable time OE B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 0.5 70 0.5 26 0.5 20 0.5 14 0.5 12 0.5 9 -40°C to 125°C 1.8 45 0.5 26 0.5 20 0.5 14 0.5 12 0.5 10 -40°C to 85°C 0.5 32 0.5 19 0.5 17 0.5 14 0.5 13 0.5 13 -40°C to 125°C 0.5 28 0.5 20 0.5 17 0.5 14 0.5 13 0.5 13 9.0 51 8.1 43 8.4 44 -40°C to 85°C 12.9 65 10.5 51 5.0 45 -40°C to 125°C 24.9 68 21.8 55 19.7 50 18.2 47 18.6 48 15.0 49 -40°C to 85°C 23.2 112 16.5 74 14.0 61 46 44 6.4 39 -40°C to 125°C 38.7 115 30.9 79 27.1 66 21.6 51 20.5 48 16.8 43 -40°C to 85°C 7.9 50 44 39 40 3.7 41 80 5.9 -40°C to 125°C 15.6 -40°C to 85°C 16.3 183 74 13.5 -40°C to 125°C 24.4 139 17.2 9.2 5.1 9.0 4.7 9.1 4.4 53 12.4 47 12.0 42 11.5 43 10.8 44 74 6.0 54 4.0 36 2.1 31 0.5 27 76 13.0 57 9.8 38 7.1 33 4.7 29 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 ns ns ns 13 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.11 Switching Characteristics, VCCA = 3.3 ± 0.3 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten Enable time OE 14 A B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 0.5 69 0.5 25 0.5 19 0.5 13 0.5 11 0.5 8 -40°C to 125°C 1.5 44 0.5 25 0.5 19 0.5 13 0.5 11 0.5 9 -40°C to 85°C 0.5 30 0.5 17 0.5 14 0.5 12 0.5 11 0.5 10 -40°C to 125°C 0.5 27 0.5 18 0.5 15 0.5 12 0.5 11 0.5 10 8.7 42 6.9 39 6.6 39 -40°C to 85°C 12.9 62 10.1 47 6.9 40 -40°C to 125°C 24.0 65 20.6 51 18.4 46 15.7 40 15.3 39 15.9 40 -40°C to 85°C 22.7 109 15.7 71 13.2 59 42 38 4.7 34 -40°C to 125°C 37.6 111 29.5 -40°C to 85°C 6.6 8.5 7.6 75 25.4 63 19.2 46 18.5 42 14.2 36 4.2 45 3.0 37 2.4 31 2.2 30 1.7 30 72 10.9 47 9.3 40 8.2 33 8.1 32 7.5 33 76 5.4 55 2.6 34 1.8 27 0.5 22 78 12.2 57 8.0 36 6.6 29 3.7 24 85 -40°C to 125°C 13.6 -40°C to 85°C 16.3 192 -40°C to 125°C 24.3 144 16.7 8.9 Submit Document Feedback ns ns ns Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.12 Switching Characteristics, VCCA = 5.0 ± 0.5 V See Figure 8-1 and Table 8-1 for test circuit and loading. See Figure 8-2, Figure 8-3, and Figure 8-4 for measurement waveforms. PARAMETER FROM TO Test Conditions B-Port Supply Voltage (VCCB) 1.2 ± 0.1 V MIN TYP tpd tdis A B B A OE A OE B Propagation delay Disable time OE ten A Enable time OE B 1.5 ± 0.1 V MAX MIN TYP 1.8 ± 0.15 V MAX MIN TYP 2.5 ± 0.2 V MAX MIN TYP 3.3 ± 0.3 V MAX MIN TYP 5.0 ± 0.5 V MAX MIN TYP UNIT MAX -40°C to 85°C 0.5 69 0.5 24 0.5 18 0.5 13 0.5 10 0.5 8 -40°C to 125°C 1.3 44 0.5 24 0.5 19 0.5 13 0.5 11 0.5 8 -40°C to 85°C 0.5 31 0.5 15 0.5 12 0.5 9 0.5 8 0.5 8 -40°C to 125°C 0.5 26 0.5 16 0.5 13 0.5 10 0.5 9 0.5 8 7.7 42 5.9 36 4.2 31 -40°C to 85°C 10.8 58 -40°C to 125°C 20.8 61 17.0 -40°C to 85°C 9.7 -40°C to 125°C 37.4 -40°C to 85°C 6.0 109 3.4 30 2.8 26 46 14.5 40 11.8 33 10.4 31 9.6 29 5.9 69 13.2 56 40 36 3.7 29 8.4 6.9 111 29.2 73 24.6 60 18.1 43 16.4 39 12.2 31 102 2.8 44 1.2 33 0.5 25 0.5 22 0.5 21 -40°C to 125°C 12.4 81 8.8 46 6.5 36 4.7 27 4.2 24 4.4 23 -40°C to 85°C 16.7 212 8.8 82 4.8 58 1.6 35 0.5 26 0.5 19 -40°C to 125°C 24.8 158 16.7 83 11.7 60 6.9 37 4.7 28 3.5 21 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 ns ns ns 15 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.13 Operating Characteristics TA = 25℃ (1) Supply Voltage (VCCB = VCCA) PARAMETER A to B: outputs enabled CpdA (2) A to B: outputs disabled B to A: outputs enabled B to A: outputs disabled A to B: outputs enabled CpdB (3) A to B: outputs disabled B to A: outputs enabled B to A: outputs disabled (1) (2) (3) 16 Test Conditions A Port CL = 0, RL = Open f = 10 MHz trise = tfall = 1 ns B Port CL = 0, RL = Open f = 10 MHz trise = tfall = 1 ns 1.2 ± 0.1V 1.5 ± 0.1V 1.8 ± 0.15V 2.5 ± 0.2V 3.3 ± 0.3V 5.0 ± 0.5V TYP TYP TYP TYP TYP TYP 2 2 2 2 2 3 2 2 2 2 2 3 12 12 12 13 13 16 2 2 2 2 2 3 12 12 12 13 13 16 2 2 2 2 2 3 2 2 2 2 2 3 2 2 2 2 2 3 UNIT pF pF See the CMOS Power Consumption and Cpd Calculation application report for additional information about how power dissipation capacitance affects power consumption. A-Port power dissipation capacitance per transceiver. B-Port power dissipation capacitance per transceiver. Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 7.14 Typical Characteristics 1.95 5 4.75 1.8 4.25 4 3.75 VCC = 5.0V VCC = 3.3V VCC = 2.5V 3.5 3.25 3 2.75 2.5 2.25 VOH - Output High Voltage (V) VOH - Output High Voltage (V) 4.5 2 1.65 1.5 1.35 1.2 1.05 VCC = 1.8V VCC = 1.5V VCC = 1.2V 0.9 1.75 1.5 0.75 0 3 6 9 12 15 18 21 24 0 0.8 1.6 IOH - Output High Current (mA) Figure 7-1. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) 4 4.8 5.6 6.4 7.2 8 0.35 VCC = 2.5V VCC = 3.3V VCC = 5.0V 0.3 VCC = 1.2V VCC = 1.5V VCC = 1.8V 0.325 0.3 0.275 VOL - Output Low Voltage (V) VOL - Output Low Voltage (V) 3.2 Figure 7-2. Typical (TA=25°C) Output High Voltage (VOH) vs Source Current (IOH) 0.35 0.325 0.25 0.225 0.2 0.175 0.15 0.125 0.1 0.075 0.275 0.25 0.225 0.2 0.175 0.15 0.125 0.1 0.075 0.05 0.05 0.025 0.025 0 0 0 3 6 9 12 15 18 21 24 0 0.8 1.6 IOL - Output Low Current (mA) 2.4 3.2 4 4.8 5.6 6.4 7.2 8 IOL - Output Low Current (mA) Figure 7-3. Typical (TA=25°C) Output Low Voltage (VOL) vs Sink Current (IOL) Figure 7-4. Typical (TA=25°C) Output Low Voltage (VOL) vs Sink Current (IOL) 0.22 2 VCC = 2.5 V VCC = 3.3 V VCC = 5 V 1.6 VCC = 1.2 V VCC = 1.5 V VCC = 1.8 V 0.2 ICC - Supply Current (mA) 1.8 ICC - Supply Current (mA) 2.4 IOH - Output High Current (mA) 1.4 1.2 1 0.8 0.6 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.4 0.04 0.2 0.02 0 0 0 0.5 1 1.5 2 2.5 3 3.5 VIN - Input Voltage (V) 4 4.5 5 Figure 7-5. Typical (TA=25°C) Supply Current (ICC) vs Input Voltage (VIN) 0 0.2 0.4 0.6 0.8 1 1.2 VIN - Input Voltage (V) 1.4 1.6 1.8 Figure 7-6. Typical (TA=25°C) Supply Current (ICC) vs Input Voltage (VIN) Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 17 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 8 Parameter Measurement Information 8.1 Load Circuit and Voltage Waveforms Unless otherwise noted, generators supply all input pulses that have the following characteristics: • f = 1 MHz • ZO = 50 Ω • Δt/ΔV ≤ 1 ns/V Measurement Point 2 x VCCO RL S1 Output Pin Under Test Open CL(1) A. GND RL CL includes probe and jig capacitance. Figure 8-1. Load Circuit Table 8-1. Load Circuit Conditions Parameter tpd Propagation (delay) time ten, tdis Enable time, disable time ten, tdis Enable time, disable time VCCO RL CL S1 1.1 V – 5.5 V 10 kΩ 5 pF Open N/A 1.1 V – 1.6 V 10 kΩ 5 pF 2 × VCCO 0.1 V 1.65 V – 2.7 V 10 kΩ 5 pF 2 × VCCO 0.15 V 3.0 V – 5.5 V 10 kΩ 5 pF 2 × VCCO 0.3 V 1.1 V – 1.6 V 10 kΩ 5 pF GND 0.1 V 1.65 V – 2.7 V 10 kΩ 5 pF GND 0.15 V 3.0 V – 5.5 V 10 kΩ 5 pF GND 0.3 V VCCI(1) VCCI(1) Input A, B Input A, B VCCI / 2 VCCI / 2 100 kHz 500 ps/V ± 1 s/V 0V 0V tpd VOH(2) tpd VOH(2) Output B, A VCCI / 2 Output B, A Ensure Monotonic Rising and Falling Edge VOL(2) VCCI / 2 VOL(2) 1. 2. 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. 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 8-3. Input Transition Rise and Fall Rate Figure 8-2. Propagation Delay 18 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 VCCA OE VCC A / 2 VCC A / 2 GND tdi s ten VCCO(3) Output(1) VCC O / 2 VOL + VTP VOL (4) VOH (4) VOH - VTP Output(2) VCC O / 2 GND A. 1. 2. 3. 4. 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 8-4. Enable Time And Disable Time Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 19 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 9 Detailed Description 9.1 Overview The TXU0104 is a 4-bit translating transceiver that uses two individually configurable power-supply rails. The device is operational with VCCA and V CCB supplies as low as 1.1 V and as high as 5.5 V. Additionally, the device can be operated with VCCA = VCCB. The A port is designed to track VCCA, and the B port is designed to track VCCB. The TXU0104 device is designed for asynchronous communication between data buses, and transmits data with fixed direction from the A bus to the B bus on some channels and from the B bus to the A bus on the remaining channels. The output-enable input (OE) is used to disable the outputs so the buses are effectively isolated. The output-enable pin of the TXU0104 (OE) can be referenced to either VCCA or VCCB. The OE pin can be left floating or externally pulled down to ground to ensure the high-impedance state of the level shifter outputs during power up or power down. 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 or output while the device is powered down. The VCC isolation or VCC disconnect feature ensures that if either VCC is less than 100 mV or disconnected with the complementary supply within recommended operating conditions, outputs are disabled and set to the high-impedance state while the supply current is maintained. The Ioff-float circuitry ensures that no excessive current is drawn from or sourced into an input or output while the supply is floating. Glitch-free power supply sequencing allows either supply rail to be powered on or off in any order while providing robust power sequencing performance. 9.2 Functional Block Diagram VCC(MIN) VCCA VCCB OE A1 B1Y A2 B2Y A3 B3Y A4 B4Y GND 20 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TXU0104 TXU0104 www.ti.com SCES937A – MAY 2021 – REVISED SEPTEMBER 2021 9.3 Feature Description 9.3.1 CMOS Schmitt-Trigger Inputs with Integrated Pulldowns 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). The Schmitt-trigger input architecture provides hysteresis as defined by ΔVT in the Electrical Characteristics, which makes this device extremely tolerant to slow or noisy inputs. Driving the inputs slowly will increase dynamic current consumption of the device. See Understanding Schmitt Triggers for additional information regarding Schmitt-trigger inputs. 9.3.1.1 Inputs with Integrated Static Pull-Down Resistors This device has 5 MΩ typical integrated weak pull-downs for each input. This feature allows all inputs to be left floating without the concern for unstable outputs or increased current consumption. This also helps to reduce external component count for applications where not all channels are used or need to be fixed low. If an external pull-up is required, it should be no larger than 1 MΩ to avoid contention with the 5 MΩ internal pull-down. 9.3.2 Control Logic (OE) with VCC(MIN) Circuitry The output-enable input (OE) is used to disable the outputs so the buses are effectively isolated. The output-enable pin of the TXU0x04 has VCC(MIN) circuitry, which allows the OE pin to operate with the lower supply voltage. The Over-Voltage Tolerant Inputs feature allows the OE pin to operate with the higher supply voltage. This combination means that the enable pin can be referenced to either VCCA or VCCB supply. Multiple permutations of each device are possible since the controller can be placed on either the A or B port and can still control the enable pin. 9.3.3 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. Absolute Maximum Ratings defines the electrical and thermal limits that must be followed at all times. 9.3.4 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 Ioff in the Electrical Characteristics specifies the maximum leakage into or out of any input or output pin on the device. 9.3.5 VCC Isolation and VCC Disconnect The outputs for this device are disabled and enter a high-impedance state when either supply is