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HIN241CBZ Datasheet(PDF) 9 Page - Intersil Corporation |
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HIN241CBZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 20 page 9 Detailed Description The HIN232 thru HIN241 family of RS-232 transmitters/receivers are powered by a single +5V power supply (except HIN239), feature low power consumption, and meet all ElA RS-232C and V.28 specifications. The circuit is divided into three sections: The charge pump, transmitter, and receiver. Charge Pump An equivalent circuit of the charge pump is illustrated in Figure 1. The charge pump contains two sections: the voltage doubler and the voltage inverter. Each section is driven by a two phase, internally generated clock to generate +10V and -10V. The nominal clock frequency is 16kHz. During phase one of the clock, capacitor C1 is charged to VCC. During phase two, the voltage on C1 is added to VCC, producing a signal across C3 equal to twice VCC. During phase one, C2 is also charged to 2VCC, and then during phase two, it is inverted with respect to ground to produce a signal across C4 equal to -2VCC. The charge pump accepts input voltages up to 5.5V. The output impedance of the voltage doubler section (V+) is approximately 200 Ω, and the output impedance of the voltage inverter section (V-) is approximately 450 Ω. A typical application uses 1 µF capacitors for C1-C4, however, the value is not critical. Increasing the values of C1 and C2 will lower the output impedance of the voltage doubler and inverter, increasing the values of the reservoir capacitors, C3 and C4, lowers the ripple on the V+ and V- supplies. During shutdown mode (HIN236, HIN240 and HIN241), SHUTDOWN control line set to logic “1”, the charge pump is turned off, V+ is pulled down to VCC, V- is pulled up to GND, and the supply current is reduced to less than 10 µA. The transmitter outputs are disabled and the receiver outputs are placed in the high impedance state. TIMING CHARACTERISTICS Baud Rate (1 Transmitter Switching) RL = 3kΩ 120 - - kbps Output Enable Time, tEN HIN236, HIN239, HIN240, HIN241 - 400 - ns Output Disable Time, tDIS HIN236, HIN239, HIN240, HIN241 - 250 - ns Propagation Delay, tPD RS-232 to TTL - 0.5 - µs Instantaneous Slew Rate SR CL = 10pF, RL = 3kΩ, TA = 25 oC (Note 4) - - 30 V/ µs Transition Region Slew Rate, SRT RL = 3kΩ, CL = 2500pF Measured from +3V to -3V or -3V to +3V, 1 Transmitter Switching -3 - V/ µs TRANSMITTER OUTPUTS Output Voltage Swing, TOUT Transmitter Outputs, 3k Ω to Ground ±5 ±9 ±10 V Output Resistance, TOUT VCC = V+ = V- = 0V, VOUT = ±2V 300 - - Ω RS-232 Output Short Circuit Current, ISC TOUT shorted to GND - ±10 - mA NOTE: 4. Guaranteed by design. Electrical Specifications Test Conditions: VCC = +5V ±10%, TA = Operating Temperature Range (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS + - C1 + - C3 + - C2 + - C4 S1 S2 S5 S6 S3 S4 S7 S8 VCC GND RC OSCILLATOR VCC GND V+ = 2VCC GND V- = -(V+) C1+ C1- C2- C2+ VOLTAGE INVERTER VOLTAGE DOUBLER FIGURE 1. CHARGE PUMP HIN232, HIN236, HIN237, HIN238, HIN239, HIN240, HIN241 |
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Similar Description - HIN241CBZ |
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