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MAX208CNG Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX208CNG Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 23 page +5V, RS-232 Transceivers with 0.1µF External Capacitors 7 Shutdown and Enable Control In shutdown mode, the MAX200/MAX205/MAX206/ MAX211/MAX213 charge pumps are turned off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter outputs are disabled. This reduces supply current typically to 1µA (15µA for the MAX213). The time required to exit shutdown is 1ms, as shown in Figure 5. All receivers except R4 and R5 on the MAX213 are put into a high-impedance state in shutdown mode. The MAX213’s R4 and R5 receivers still function in shutdown mode. These two receivers are useful for monitoring external activity while maintaining minimal power con- sumption. The enable control is used to put the receiver outputs into a high-impedance state, so that the receivers can be connected directly to a three-state bus. It has no effect on the RS-232 drivers or on the charge pumps. MAX213 Receiver Operation in Shutdown During normal operation, the MAX213’s receiver propa- gation delay is typically 1Fs. When entering shutdown with receivers active, R4 and R5 are not valid until 80Fs after SHDN is driven low. In shutdown mode, propaga- tion delays increase to 4Fs for a high-to-low or a low-to- high transition. When exiting shutdown, all receiver outputs are invalid until the charge pumps reach nominal values ( < 2ms when using 0.1FF capacitors). Figure 5. Transmitter Outputs When Exiting Shutdown Table 1a. MAX200 Control Pin Configurations Table 1b. MAX205/MAX206/MAX211 Control Pin Configurations Table 1c. MAX213 Control Pin Configurations *Active = active with reduced performance. TWO TRANSMITTER OUTPUTS: ONE HIGH, ONE LOW SHDN* THREE TRANSMITTERS LOADED WITH 3kI||2500pF. *SHUTDOWN POLARITY REVERSED FOR MAX213. SHUTDOWN TRANSMITTERS ON SHDN OPERATION STATUS TRANSMITTERS T1–T5 0 Normal Operation All Active 1 Shutdown All High-Z SHDN EN OPERATION STATUS TRANSMITTERS T1–T5 RECEIVERS R1–R5 0 0 Normal Operation All Active All Active 0 1 Normal Operation All Active All High-Z 1 0 Shutdown All High-Z All High-Z SHDN EN OPERATION STATUS TRANSMITTERS T1–T4 RECEIVERS R1, R2, R3 R4, R5 0 0 Shutdown All High-Z High-Z High-Z 0 1 Shutdown All High-Z High-Z Active* 1 0 Normal Operation All Active High-Z High-Z 1 1 Normal Operation All Active Active Active |
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