Datasheet LTC4309 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Level Shifting Low Offset Hot Swappable 2-Wire Bus Buffer with Stuck Bus Recovery |
| 页数 / 页 | 16 / 3 — The. ELECTRICAL CHARACTERISTICS. denotes the specifi cations which apply … |
| 文件格式/大小 | PDF / 205 Kb |
| 文件语言 | 英语 |
The. ELECTRICAL CHARACTERISTICS. denotes the specifi cations which apply over the full operating
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LTC4309
The ELECTRICAL CHARACTERISTICS
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = 3.3V, VCC2 = 3.3V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCC Positive Supply Voltage l 2.3 5.5 V VCC2 Input Side Accelerator Supply Voltage l 1.8 5.5 V ICC VCC Input Supply Current Enabled VCC = VCC2 = 5.5V, VSDAIN = VSCLIN = 0V (Note 2) l 7 11 mA ISD VCC Input Supply Current Disabled VCC = VCC2 = 5.5V, SDA = SCL = 5.5V, ENABLE = OV l 900 1400 μA ICC2 VCC2 Input Supply Current Enabled VCC = VCC2 = 5.5V, VSDAIN = VSCLIN = 0V (Note 2) l 190 250 μA ISD2 VCC2 Input Supply Current Disabled VCC = VCC2 = 5.5V, SDA = SCL = 5.5V, ENABLE = OV l 140 180 μA
Propagation Delay and Rise Time Accelerators
tPHL SDA/SCL Propagation Delay High to Low CLOAD = 50pF, 2.7k to VCC on SDA, SCL, (Note 3, 4), (Figure 1) 85 ns tPLH SDA/SCL Propagation Delay Low to High CLOAD = 50pF, 2.7k to VCC on SDA, SCL, (Note 3, 4), (Figure 1) 10 ns tRISE SDA/SCL Rise Time CLOAD = 100pF, 10k to VCC on SDA, SCL, VCC = 5V VCC2 = 5V, 30 300 ns (Note 3, 5), (Figure 1) tFALL SDA/SCL Fall Time CLOAD = 100pF, 10k to VCC on SDA, SCL, VCC = 5V (Note 3, 5), 30 300 ns (Figure 1) IPULLUPAC Transient Boosted Pull-up Current Positive Transition > 0.8V/μS on SDA, SCL, VCC = 3.3V (Note 7) 5 8 mA
Start-Up Circuitry
VPRE Precharge Voltage SDA, SCL Open l 0.8 1.0 1.2 V tIDLE Bus Idle Time l 55 95 175 μs VTHR_EN ENABLE Threshold Voltage ENABLE Rising Edge l 0.8 1.4 2 V VTHR_EN(HYST) ENABLE Threshold Voltage Hysteresis (Note 3) 100 mV VTHR_CTRL ACC, DISCEN Threshold Voltage 0.5 0.7 1 V ICTRL ENABLE, ACC, DISCEN Input Currents ENABLE, ACC, DISCEN from 0 to VCC l 0.1 ±5 μA tPLH_EN ENABLE Delay Off-On (Figure 1) 95 μs tPHL_EN ENABLE Delay On-Off (Note 3), (Figure 1) 10 ns tPLH_READY READY Delay On-Off (Note 3), (Figure 1) 10 ns tPHL_READY READY Delay Off-On (Note 3), (Figure 1) 10 ns VOL_READY READY Output Low Voltage IREADY = 3mA, VCC = 2.3V l 0.4 V IOFF_READY READY Off Leakage Current VCC = READY = 5.5V l 0.1 ±5 μA
Timing Characteristics
fI2C, MAX I2C Maximum Operating Frequency (Note 3) 400 600 kHz tBUF Bus Free Time Between Stop and Start (Note 3) 1.3 μs Condition tHD, STA Hold Time After (Repeated) (Note 3) 100 ns Start Condition tSU, STA Repeated Start Condition Set-Up Time (Note 3) 0 ns tSU, STO Stop Condition Set-Up Time (Note 3) 0 ns tHD, DATI Data Hold Time Input (Note 3) 0 ns tSU, DAT Data Set-Up Time (Note 3) 100 ns
Input-Output Connection
VOS Input-Output Offset Voltage 2.7k to VCC2 on SDA, SCL, Driven SDA, SCL = 0.2V l 20 60 100 mV VTHR SDA, SCL Logic Input Threshold Voltage VCC ≥ 2.9V 1.4 1.65 1.9 V VCC < 2.9V 1.1 1.35 1.6 V 4309fa 3
The ELECTRICAL CHARACTERISTICS
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = 3.3V, VCC2 = 3.3V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VCC Positive Supply Voltage l 2.3 5.5 V VCC2 Input Side Accelerator Supply Voltage l 1.8 5.5 V ICC VCC Input Supply Current Enabled VCC = VCC2 = 5.5V, VSDAIN = VSCLIN = 0V (Note 2) l 7 11 mA ISD VCC Input Supply Current Disabled VCC = VCC2 = 5.5V, SDA = SCL = 5.5V, ENABLE = OV l 900 1400 μA ICC2 VCC2 Input Supply Current Enabled VCC = VCC2 = 5.5V, VSDAIN = VSCLIN = 0V (Note 2) l 190 250 μA ISD2 VCC2 Input Supply Current Disabled VCC = VCC2 = 5.5V, SDA = SCL = 5.5V, ENABLE = OV l 140 180 μA
Propagation Delay and Rise Time Accelerators
tPHL SDA/SCL Propagation Delay High to Low CLOAD = 50pF, 2.7k to VCC on SDA, SCL, (Note 3, 4), (Figure 1) 85 ns tPLH SDA/SCL Propagation Delay Low to High CLOAD = 50pF, 2.7k to VCC on SDA, SCL, (Note 3, 4), (Figure 1) 10 ns tRISE SDA/SCL Rise Time CLOAD = 100pF, 10k to VCC on SDA, SCL, VCC = 5V VCC2 = 5V, 30 300 ns (Note 3, 5), (Figure 1) tFALL SDA/SCL Fall Time CLOAD = 100pF, 10k to VCC on SDA, SCL, VCC = 5V (Note 3, 5), 30 300 ns (Figure 1) IPULLUPAC Transient Boosted Pull-up Current Positive Transition > 0.8V/μS on SDA, SCL, VCC = 3.3V (Note 7) 5 8 mA
Start-Up Circuitry
VPRE Precharge Voltage SDA, SCL Open l 0.8 1.0 1.2 V tIDLE Bus Idle Time l 55 95 175 μs VTHR_EN ENABLE Threshold Voltage ENABLE Rising Edge l 0.8 1.4 2 V VTHR_EN(HYST) ENABLE Threshold Voltage Hysteresis (Note 3) 100 mV VTHR_CTRL ACC, DISCEN Threshold Voltage 0.5 0.7 1 V ICTRL ENABLE, ACC, DISCEN Input Currents ENABLE, ACC, DISCEN from 0 to VCC l 0.1 ±5 μA tPLH_EN ENABLE Delay Off-On (Figure 1) 95 μs tPHL_EN ENABLE Delay On-Off (Note 3), (Figure 1) 10 ns tPLH_READY READY Delay On-Off (Note 3), (Figure 1) 10 ns tPHL_READY READY Delay Off-On (Note 3), (Figure 1) 10 ns VOL_READY READY Output Low Voltage IREADY = 3mA, VCC = 2.3V l 0.4 V IOFF_READY READY Off Leakage Current VCC = READY = 5.5V l 0.1 ±5 μA
Timing Characteristics
fI2C, MAX I2C Maximum Operating Frequency (Note 3) 400 600 kHz tBUF Bus Free Time Between Stop and Start (Note 3) 1.3 μs Condition tHD, STA Hold Time After (Repeated) (Note 3) 100 ns Start Condition tSU, STA Repeated Start Condition Set-Up Time (Note 3) 0 ns tSU, STO Stop Condition Set-Up Time (Note 3) 0 ns tHD, DATI Data Hold Time Input (Note 3) 0 ns tSU, DAT Data Set-Up Time (Note 3) 100 ns
Input-Output Connection
VOS Input-Output Offset Voltage 2.7k to VCC2 on SDA, SCL, Driven SDA, SCL = 0.2V l 20 60 100 mV VTHR SDA, SCL Logic Input Threshold Voltage VCC ≥ 2.9V 1.4 1.65 1.9 V VCC < 2.9V 1.1 1.35 1.6 V 4309fa 3