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ICL3310EIB-T Datasheet(PDF) 5 Page - Intersil Corporation |
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ICL3310EIB-T Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 10 page 5 All the receivers convert RS-232 signals to CMOS output levels and accept inputs up to ±30V while presenting the required 3k Ω to 7kΩ input impedance (see Figure 1) even if the power is off (VCC = 0V). The receivers’ Schmitt trigger input stage uses hysteresis to increase noise immunity and decrease errors due to slow input signal transitions. Low Power Operation This 3V device requires a nominal supply current of 0.3mA, even at VCC = 5.5V, during normal operation (not in powerdown mode). This is considerably less than the 11mA current required by comparable 5V RS-232 devices, allowing users to reduce system power simply by replacing the old style device with the ICL3310E. Low Power, Pin Compatible Replacement Pin compatibility with existing 5V products (e.g., MAX222), coupled with the wide operating supply range, make the ICL3310E a potential lower power, higher performance drop- in replacement for existing 5V applications. As long as the ±5V RS-232 output swings are acceptable, and transmitter pull-up resistors aren’t required, the ICL3310E should work in most 5V applications. When replacing a device in an existing 5V application, it is acceptable to terminate C3 to VCC as shown on the “Typical Operating Circuit”. Nevertheless, terminate C3 to GND if possible, as slightly better performance results from this configuration. Powerdown Functionality The already low current requirement drops significantly when the device enters powerdown mode. In powerdown, supply current drops to 1 µA, because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to GND), and the transmitter and receiver outputs three-state. This micro-power mode makes these devices ideal for battery powered and portable applications. Software Controlled (Manual) Powerdown The ICL3310E may be forced into its low power, standby state via a simple shutdown (SHDN) pin (see Figure 4). Driving this pin high enables normal operation, while driving it low forces the IC into it’s powerdown state. The time required to exit powerdown, and resume transmission is less than 50 µs. Connect SHDN to VCC if the powerdown function isn’t needed. RXOUT GND ≤ VROUT ≤ VCC 5k Ω RXIN -25V ≤ VRIN ≤ +25V GND VCC FIGURE 1. INVERTING RECEIVER CONNECTIONS FIGURE 2. POWER DRAIN THROUGH POWERED DOWN PERIPHERAL OLD VCC POWERED GND SHDN = GND VCC Rx Tx VCC CURRENT VOUT = VCC FLOW RS-232 CHIP DOWN UART FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN ICL3310E TRANSITION DETECTOR RX TX VCC VCC TO VOUT = HI-Z WAKE-UP LOGIC POWERED DOWN UART V- ICL3310E |
Similar Part No. - ICL3310EIB-T |
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Similar Description - ICL3310EIB-T |
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