MAX3228AEEWV+T Maxim Integrated, MAX3228AEEWV+T Datasheet - Page 11

• Manufacturer Part Number: MAX3228AEEWV+T
• Description: RS-232 Interface IC +2.5V to +5.5V RS-232 Tranceivers in UCSP
• Manufacturer: Maxim Integrated
• Series: MAX3228AE, MAX3228E, MAX3229AE, MAX3229Er

Specifications of MAX3228AEEWV+T

• Data Rate: 250 Kbps
• Operating Supply Voltage: 2.5 V to 5.5 V
• Supply Current: 10 uA
• Operating Temperature Range: - 40 C to + 85 C
• Number Of Drivers: 2
• Number Of Receivers: 2

Figure 7 shows a transmitter output when exiting shut-
down mode. The transmitter is loaded with 3kΩ in par-
allel with 1000pF. The transmitter output displays no
ringing or undesirable transients as it comes out of
shutdown, and is enabled only when the magnitude of
V- exceeds approximately -3V.
The MAX3228E/AE and MAX3229E/AE maintain the RS-
232 ±5.0V minimum transmitter output voltage even at
high data rates. Figure 8 shows a transmitter loopback
test circuit. Figure 9 shows a loopback test result at
120kbps, and Figure 10 shows the same test at 250kbps.
Figure 7. Transmitter Outputs Exiting Shutdown or Powering Up
Figure 8. Transmitter Loopback Test Circuit
FORCEON =
FORCEOFF
0.1μF
TOUT
C2
C1
C1+
C1-
C2+
C2-
T1IN
R1OUT
FORCEON
______________________________________________________________________________________
Transmitter Outputs when
V
V
MAX3229E/AE
CC
CC
RS-232 Transceivers in UCSP and WLP
4μs/div
GND
V
V
L
L
±15kV ESD-Protected +2.5V to +5.5V
V
V
L
L
FORCEOFF
INVALID
T1OUT
5kΩ
Exiting Shutdown
R1IN
High Data Rates
V+
V-
TO POWER-
MANAGEMENT UNIT
V
L
0
2V/div
5V/div
0
0.1μF
C3
C4
1000pF
For Figure 9, the transmitter was driven at 120kbps into
an RS-232 load in parallel with 1000pF. For Figure 10, a
single transmitter was driven at 250kbps, and loaded
with an RS-232 receiver in parallel with 1000pF.
Figure 9. Loopback Test Result at 120kbps
Figure 10. Loopback Test Result at 250kbps
R_OUT
R_OUT
T_OUT
T_OUT
T_IN
T_IN
4μs/div
4μs/div
5V
0
5V
0
-5V
5V
0
5V
0
5V
0
-5V
5V
0
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