The MAX3318 is a dual-driver, dual-receiver, RS-232 compatible transceiver. The device features auto-power-down plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver output and receiver input are protected to ±8 kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the Human-Body Model (HBM).

The device operates at a data rate of 460 kbps. The transceiver has a proprietary low-dropout driver output stage enabling RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump. The charge pump requires only four 0.1-μF capacitors and features a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.

The MAX3318 achieves a 1-μA supply current using the auto-power-down feature. This device automatically enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 s. The device turns on again when it senses a valid transition at any driver or receiver input. Auto power down saves power without changes to the existing BIOS or operating system.

This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.

Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-power-down plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 μA. By disconnecting the serial port or placing the peripheral drivers off, auto-power-down plus can be disabled when FORCEON and FORCEOFF are high. With auto-power-down plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between –0.3 V and 0.3 V for less than 30 μs (typical number). INVALID is low (invalid data) if all receiver input voltage are between –0.3 V and 0.3 V for more than 30 μs (typical number).

• ESD Protection for RS-232 I/O Pins
  • ±15 kV (Human-Body Model)
  • ±8 kV (IEC 61000-4-2, Contact Discharge)
  • ±8 kV (IEC 61000-4-2, Air-Gap Discharge)
• 300-μA Operating Supply Current
• 1-μA Low-Power Standby (With Receivers Active) Mode
• Designed to Transmit at a Data Rate of 460 kbps
• Auto-Power-Down Plus Option Features Flexible Power-Saving Mode
• Operates From a Single 2.25-V to 3-V VCC Supply

• Drivers per package
• 2
• Receivers per package
• 2
• Logic voltage (Min) (V)
• 2.5
• Data rate (Max) (kbps)
• 460
• Main supply voltage (Nom) (V)
• 2.5
• Features
• Auto-Powerdown Plus
• ESD HBM (kV)
• 15
• Rating
• Catalog
• Operating temperature range (C)
• -40 to 85, 0 to 70
• Vout (Typ) (V)
• 5.4

MAX3318的完整型号有：MAX3318CDBR、MAX3318CPW、MAX3318CPWR、MAX3318IDBR、MAX3318IPW、MAX3318IPWR，以下是这些产品的关键参数及官网采购报价：

MAX3318CDBR，工作温度：0 to 70，封装：SSOP (DB)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318CDBR的批量USD价格：1.286（1000+）

MAX3318CPW，工作温度：0 to 70，封装：TSSOP (PW)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318CPW的批量USD价格：1.501（1000+）

MAX3318CPWR，工作温度：0 to 70，封装：TSSOP (PW)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318CPWR的批量USD价格：1.286（1000+）

MAX3318IDBR，工作温度：-40 to 85，封装：SSOP (DB)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318IDBR的批量USD价格：1.179（1000+）

MAX3318IPW，工作温度：-40 to 85，封装：TSSOP (PW)-20，包装数量MPQ：70个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318IPW的批量USD价格：1.608（1000+）

MAX3318IPWR，工作温度：-40 to 85，封装：TSSOP (PW)-20，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网MAX3318IPWR的批量USD价格：1.394（1000+）

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