OR GND.
Typical Operating Circuit
___________________Chip Information
TRANSISTOR COUNT: 2110
and Figure 10 shows the same test at 250kbps. For
Figure 9, all transmitters were driven simultaneously at
120kbps into RS-232 loads in parallel with 1000pF. For
Figure 10, a single transmitter was driven at 250kbps,
and all transmitters were loaded with an RS-232 receiv-
er in parallel with 1000pF.
Data Cable Applications
The MAX3238E/MAX3248Es’ ±15kV ESD protection on
both the RS-232 I/Os as well as the logic I/Os makes
them ideal candidates for data cable applications. A
data cable is both an electrical connection and a level
translator, allowing ultra-miniaturization of cell phones
and other small portable devices.
Previous data cable approaches suffered from com-
plexity due to the required protection circuits on both
the logic side of the cable as well as on the RS-232
connections. The example shown in Figure 10 shows
the ease of using the MAX3238E/MAX3248E in data
cable applications.
The MAX3238E/MAX3248Es’ five-transmitter and three-
receiver configuration is optimized for a data communi-
cation equipment (DCE) application, allowing full hard-
ware handshaking. The 9-pin RS-232 connector is
configured for direct attachment to a PC’s serial port.
R1OUTB is also connected to the subminiature con-
nector. This allows the remote system to shut down
until the PC asserts the ready to send (RTS) signal.
R1OUTB stays active when the MAX3238E/MAX3248E
is shut down (FORCEOFF = GND).
