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MAX3316EEUP Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3316EEUP Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers _______________________________________________________________________________________ 7 Pin Description (continued) Detailed Description Dual Charge-Pump Voltage Converter The MAX3316E–MAX3319Es’ internal power supply consists of a regulated dual charge pump that provides output voltages of +4.4V (doubling charge pump) and -4.3V (inverting charge pump), over the +2.25V to +3.0V range. The charge pump operates in discontinu- ous mode: if the output voltages are less than 4.4V, the charge pump is enabled; if the output voltages exceed 4.4V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies. The READY output (MAX3318E/MAX3319E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -2.75V. RS-232 Compatible Transmitters The MAX3316E–MAX3319Es’ transmitters are inverting level translators that convert CMOS-logic levels to RS-232 compatible voltage levels. They guarantee a 460kbps data rate with worst-case loads of 3k Ω in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™). The MAX3317E’s transmitters are turned off (high impedance) when SHDN is asserted low, putting the device in shutdown mode. The MAX3318E/MAX3319Es’ transmitters are turned off (high impedance) when FORCEOFF is asserted low, or when the AutoShutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30 seconds. The transmitter outputs can be driven to ±12V when power is off. The transmitter inputs do not have internal pull-up resistors. Connect unused inputs to GND or VCC. RS-232 Receivers The MAX3316E–MAX3319Es’ receivers convert ±3.7V to ±13.2V RS-232 signal levels into CMOS-logic output levels. The receivers are rated to receive signals up to ±25V. The MAX3316E/MAX3318E/MAX3319Es’ receivers feature inverting outputs that always remain active (Table 1). The MAX3317E’s receivers have inverting, three-state outputs. In shutdown, the receivers can be active or inactive (Table 2). The MAX3318E/MAX3319E feature an INVALID output that is asserted low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiver’s input condition, it is independent of the states of FORCEON and FORCEOFF. MAX3317E 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 dis- abled (high impedance). The time required to exit shut- LapLink is a trademark of Traveling Software. PIN MAX3316E MAX3317E MAX3318E MAX3319E NAME FUNCTION Shutdown Control, Active Low Ready to Transmit Output, Active High. READY is enabled high when V- goes below -3.5V and the device is ready to transmit. Valid Signal Detector Output, Active Low. A logic high indicates that a valid RS-232 level is present on a receiver input. Force-On Input, Active High. Drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high) (Table 1). Force-Off Input, Active Low. Drive low to shut down transmitters, receivers, and charge pump. This overrides AutoShutdown Plus and FORCEON (Table 1). FORCEOFF FORCEON INVALID READY SHDN — 1 10 12 16 20 14 11 1 — 20 — — — — — — — — — SSOP TSSOP |
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