产品特点 Features
- in the transmission line.
- Drivers
- The driver outputs of the SP481E and
- SP485E are differential outputs meeting the
- RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0
- Volts to +5 Volts. With worst case loading of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V volt- age levels. The drivers of the SP481E and
- SP485E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on the DE(pin 3) will tri-state the driver outputs.
- safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected.
- Shutdown Mode
- SP481E
- The SP481E is equipped with a Shutdown mode. TO enable the shutdown state, both driver and receiver must be disabled simul- taneously. A logic LOW on DE (pin 3) and a
- Logic HIGH on RE (pin 2) will put the SP481E into Shutdown mode. In Shutdown, supply current will drop to typically µA.
- The Human Body Model has been the
- For system manufacturers, they must guar-
绝对最大额定值 Absolute Maximum Ratings（TA = 25°C）
超过下表数值可能造成器件永久损坏，设计时请留余量。
| 额定值 | 条件 | for | extended | periods | of | time | may |
|---|---|---|---|---|---|---|---|
| These | are stress | ratings | only and | functional | operation | ||
| indicated | in the | operation | sections | of the | specifications | ||
| Logic.........................-0.3V to (Vcc + 0.5V) | |||||||
| Drivers.............................................+/-15V | |||||||
| Receivers..................-0.3V to (Vcc + 0.5V) | |||||||
| Storage Temperature.......................-65˚C to +150˚C | |||||||
| CC | 8-pin NSOIC...................................................550mW | ||||||
| (derate 6.60mW/ºC above +70ºC) | |||||||
| Logic.........................-0.3V | to | (Vcc | + | 0.5V) | |||
| 8-pin PDIP....................................................000mW | |||||||
| Drivers......................-0.3V | to | (Vcc | + | 0.5V) | |||
| (derate .8mW/ºC above +70ºC) | |||||||
| Receivers.........................................+/-15V |
数据来源：原厂规格书
电气特性 Electrical Characteristics（TA = 25°C）
| 参数 | 最小 | 典型 | 最大 | 单位 | 条件 |
|---|---|---|---|---|---|
| Differential Output Voltage | GND | Vcc | Volts | Unloaded; R = ∞ ; see Figure 1 | |
| Differential Output Voltage | 2 | Vcc | Volts | With Load; R = 50Ω (RS-422); see Figure 1 | |
| Differential Output Voltage | .5 | Vcc | Volts | With Load; R = 27Ω (RS-485); see Figure 1 | |
| Change in Magnitude | of Driver | 0.2 | Volts | R = 27Ω or R = 50Ω; see Figure 1 | |
| Driver Common Mode | Output | 3 | Volts | R = 27Ω or R = 50Ω; see Figure 1 | |
| Input High Voltage | 2.0 | Volts | Applies to DE, DI, RE | ||
| Input Low Voltage | 0.8 | Volts | Applies to DE, DI, RE | ||
| Input Current | +/-0 | µA | Applies to DE, DI, RE | ||
| V = HIGH | +/-250 | mA | -7V ≤ V ≤ +12V | ||
| V = LOW | +/-250 | mA | -7V ≤ V ≤ +12V | ||
| Max. Transmission Rate | 0 | Mbps | RE = 5V, DE = 5V; R = 54Ω, | ||
| C = C = 00pF L L2 | |||||
| Driver Input to Output, | t 20 | 30 | 60 | ns | See Figures 3 & 5, R = 54Ω, |
| C = C = 00pF | |||||
| Driver Input to Output, | t 20 | 30 | 80 | ns | L L2 |
| Driver Input to Output, | t 20 | 30 | 60 | ns | See Figures 3 & 5, R = 54Ω, |
| C = C = 00pF | |||||
| Driver Input to Output, | t 20 | 30 | 80 | ns | L L2 |
| Driver Rise or Fall Time | 3 | 5 | 40 | ns | From 0%-90%; R = 54Ω |
| C = C = 100pF; see Figures 3 L L2 and 6 | |||||
| Differential Input Threshold | -0.2 | +0.2 | Volts | -7V ≤ V ≤ +12V | |
| Differential Input Threshold | -0.4 | +0.4 | Volts | -7V ≤ V ≤ +12V | |
| Input Hysteresis | 20 | mV | V = 0V | ||
| Output Voltage High | 3.5 | Volts I | = -4mA, V = +200mV | ||
| Output Voltage Low | 0.4 | Volts I | = +4mA, V = +200mV | ||
| Three-State ( High | Impedance) | +/- | µA | 0.4V ≤ V ≤ 2.4V; RE = 5V | |
| Input Resistance | 2 | 5 | kΩ | -7V ≤ V ≤ +12V | |
| Input Current (A, B); V | = 2V | +.0 | mA | DE = 0V, V = 0V or 5.25V, V = 2V | |
| Input Current (A, B); V | = -7V | -0.8 | mA | DE = 0V, V = 0V or 5.25V, V = -7V | |
| Short Circuit Current | 7 | 95 | mA | 0V ≤ V ≤ V | |
| Max. Transmission Rate | 0 | Mbps | RE = 0V, DE = 0V | ||
| Receiver Input to Output | 20 | 45 | 00 | ns t | See Figures 3 & 7, R = |
| 54Ω, C = C = 00pF L L2 | |||||
| Receiver Input to Output | 20 | 45 | 00 | ns t | See Figures 3 & 7, R = |
| 54Ω, C = C = 00pF L L2 | |||||
| Differential Receiver | Skew | 3 | ns | R = 54Ω, C = C = 100pF, see DIFF L L2 | |
| Receiver Enable to | Output Low | 45 | 70 | ns | C = 15pF, Figures 2 & 8; S |
| Receiver Enable to | Output High | 45 | 70 | ns | C = 15pF, Figures 2 & 8; S RL 2 |
| Receiver Disable from | LOW | 45 | 70 | ns | C = 15pF, Figures 2 & 8; S |
| Receiver Disable from | High | 45 | 70 | ns | C = 15pF, Figures 2 & 8; S RL 2 |
| Time to Shutdown | 50 | 200 | 600 | ns | RE = 5V, DE = 0V |
| to Output High | S Closed | ||||
| to Output Low | S Closed L 2 | ||||
| Shutdown to Output | High | Closed | |||
| Shutdown to Output Low | Closed | ||||
| Supply Voltage V | +4.75 | +5.25 | Volts | ||
| No Load | 900 | µA | RE, DI = 0V or V ; DE = V | ||
| 600 | µA | RE = 0V, DI = 0V or 5V; DE = 0V | |||
| Shutdown Mode | 0 | µA | DE = 0V, RE = V | ||
| Commercial (_C_) | 0 | 70 | ºC | ||
| Industrial (_E_) | -40 | +85 | ºC | ||
| (_M_) | -40 | +25 | ºC | ||
| Storage Temperature | -65 | +50 | ºC |
订货信息与供货形式
| Model | Temperature | Range | 封装 | 型号 |
|---|---|---|---|---|
| Model | Temperature | Range | Package | Types |
应用领域 Applications
产品应用与封装尺寸
图纸取自该型号原厂规格书的应用电路与封装尺寸章节，点击图片可放大查看原始尺寸标注。