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MAX3317EAP Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3317EAP Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page 2.5V, 1µA, 460kbps, RS-232-Compatible Transceivers 8 _______________________________________________________________________________________ MAX3317 Shutdown Mode Supply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter outputs are disabled (high impedance). The time required to exit shutdown is typically 30µs, as shown in Figure 2. Connect SHDN to VCC if the shutdown mode is not used; SHDN has no effect on R_OUT. MAX3318/MAX3319 AutoShutdown Plus Mode Maxim’s AutoShutdown Plus feature on the MAX3318/ MAX3319 allows the supply current to fall to 1µA. These devices will enter the AutoShutdown Plus mode if FORCEOFF is high, FORCEON is low, and they do not sense a valid signal transition on any receiver or trans- mitter input for 30 seconds. This may occur if the RS-232 cable is disconnected or if the peripheral transmitters are turned off, and the UART driving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating system. Figure 4a depicts valid and invalid RS-232 receiver volt- age levels. INVALID indicates the receiver input’s condi- tion and is independent of FORCEON and FORCEOFF states. Figure 3 and Table 1 summarize the operating modes of the MAX3318/MAX3319. FORCEON and FORCEOFF override AutoShutdown Plus circuitry. When neither control is asserted, the IC selects between these states automatically, based on the last receiver or trans- mitter edge received. X X X X VALID RECEIVER LEVEL Active Active Active Active R_OUT No Yes X X RECEIVER OR TRANSMITTER EDGE WITHIN 30s High-Z Active Active High-Z T_OUT Shutdown (AutoShutdown Plus) 0 1 Normal Operation (AutoShutdown Plus) 0 1 Normal Operation (Forced On) 1 1 Shutdown (Forced Off) X 0 OPERATION STATUS FORCEON FORCEOFF No Yes No X Yes Active Active Active Active Active X X No Yes X High-Z Active High-Z Active Active Shutdown (AutoShutdown) INVALID** INVALID** Normal Operation (AutoShutdown) INVALID** INVALID** Shutdown INVALID* 1 Normal Operation INVALID* 1 Normal Operation INVALID* 1 Table 1. Output Control Truth Table (MAX3318/MAX3319) Table 2. Shutdown and Enable Control Truth Table (MAX3317) X = Don’t care *INVALID connected to FORCEON **INVALID connected to FORCEON and FORCEOFF SHDN EN T_OUT R_OUT 0 0 High-Z Active 0 1 High-Z High-Z 1 0 Active Active 1 1 Active High-Z |
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