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MAX3384E Datasheet(PDF) 5 Page - Maxim Integrated Products

Part No. MAX3384E
Description  ±15kV ESD-Protected, 3.0V to 5.5V, Low-Power, up to 250kbps, True RS-232 Transceiver
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX3384E Datasheet(HTML) 5 Page - Maxim Integrated Products

 
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±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
_______________________________________________________________________________________
5
_______________Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3384E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), over the +3.0V to +5.5V VCC
range. The charge pump operates in discontinuous
mode; if the output voltages are less than 5.5V, the
charge pump is enabled, and if the output voltages
exceed 5.5V, 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 (Figure 1).
RS-232 Transmitters
The transmitters are inverting level translators that con-
vert CMOS-logic levels to ±5.0V EIA/TIA-232 levels.
The MAX3384E transmitters guarantee a 250kbps data
rate with worst-case loads of 3k
Ω in parallel with 1000pF,
providing compatibility with PC-to-PC communication
software (such as LapLink™). Transmitters can be paral-
leled to drive multiple receivers or mice.
The MAX3384E’s transmitters are disabled and the out-
puts are forced into a high-impedance state when the
device is in shutdown (SHDN = GND). The MAX3384E
permits the outputs to be driven up to ±12V in shut-
down.
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or VCC.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic
output levels (Table 1). The receiver outputs are forced
into a high-impedance state when the device is in shut-
down (SHDN = GND). This allows a single UART to
multiplex between different protocols.
Shutdown Mode
Supply current falls to less than 1µA in shutdown mode
(SHDN = low). When shut down, the device’s charge
0
SHDN
1
High-Z
T_OUT
Active
High-Z
R_OUT
Active
MAX3384E
5k
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
VCC
C4
C1
C2
0.1
µF
VCC
SHDN
T_ OUT
T_ IN
GND
VCC
7k
150pF
MAX3384E
5k
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
VCC
C4
C3
3k
C3
3k
C1
C2
0.1
µF
VCC
SHDN
T_ OUT
T_ IN
GND
VCC
3k
2500pF
MINIMUM SLEW-RATE TEST CIRCUIT
MAXIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
Table 1. Shutdown Truth Table
Laplink is a trademark of Traveling Software.


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