MAX3225ECTP View Datasheet(PDF) - Maxim Integrated
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MAX3225ECTP
Maxim Integrated
MAX3225ECTP Datasheet PDF : 21 Pages
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MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E
±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
transmitter is loaded with 3kΩ in parallel with 1000pF.
The transmitter outputs display no ringing or undesir-
able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude
of V- exceeds approximately -3V.
High Data Rates
The MAX3224E/MAX3226E/MAX3244E maintain the
RS-232 ±5.0V minimum transmitter output voltage even
at high data rates. Figure 9 shows a transmitter loop-
back test circuit. Figure 10 shows a loopback test result
at 120kbps, and Figure 11 shows the same test at
250kbps. For Figure 10, all transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 11, a single transmitter was dri-
ven at 250kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 250pF.
The MAX3225E/MAX3227E/MAX3245E maintain the
RS-232 ±5.0V minimum transmitter output voltage at
data rates up to 1Mbps (MegaBaud). Figure 12 shows
a loopback test result with a single transmitter driven at
1Mbps and all transmitters loaded with an RS-232
receiver in parallel with 250pF.
T1IN
5V/div
T1OUT
5V/div
R1OUT
VCC = 3.3V
2μs/div
5V/div
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 120kbps
T1IN
5V/div
T1OUT
5V/div
VCC
CBYPASS
VCC
C1+
V+
C1
C1-
MAX3224E
C3*
MAX3225E
C2+
MAX3226E
V-
C2
MAX3227E
C4
C2-
MAX3244E
MAX3245E
T_ IN
T_ OUT
R1OUT
VCC = 3.3V
2μs/div
5V/div
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 250kbps
T1IN
5V/div
R_ OUT
R_ IN
FORCEON
5kΩ
VCC
FORCEOFF
GND
*C3 CAN BE RETURNED TO VCC OR GND.
Figure 9. Loopback Test Circuit
Maxim Integrated
1000pF
T1OUT
5V/div
R1OUT
VCC = 3.3V
200ns/div
5V/div
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test
Result at 1Mbps
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