MAX3228EBV-T Maxim Integrated, MAX3228EBV-T Datasheet - Page 10

• Manufacturer Part Number: MAX3228EBV-T
• Description: RS-232 Interface IC 2.5-5.5V Transceiver
• Manufacturer: Maxim Integrated
• Series: MAX3228, MAX3229r

Specifications of MAX3228EBV-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
• Mounting Style: SMD/SMT
• Package / Case: UCSP-20 6 x 5
• Number Of Drivers: 2
• Number Of Receivers: 2

Figure 5 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 MAX3228/MAX3229 maintain the RS-232 ±5.0V
minimum transmitter output voltage even at high data
rates. Figure 6 shows a transmitter loopback test cir-
+2.5V to +5.5V RS-232 Transceivers
in UCSP
Figure 6. Transmitter Loopback Test Circuit
10
______________________________________________________________________________________
0.1µF
C2
C1
C1+
C1-
C2+
C2-
R1OUT
FORCEON
T1IN
V
V
CC
CC
Transmitter Outputs when
MAX3229
GND
V
V
L
L
V
V
L
L
FORCEOFF
INVALID
T1OUT
5kΩ
Exiting Shutdown
R1IN
V+
V-
High Data Rates
TO POWER-
MANAGEMENT UNIT
V
0.1µF
C3
C4
L
1000pF
cuit. Figure 7 shows a loopback test result at 120kbps,
and Figure 8 shows the same test at 250kbps. For
Figure 7, the transmitter was driven at 120kbps into an
RS-232 load in parallel with 1000pF. For Figure 8, a sin-
gle transmitter was driven at 250kbps, and loaded with
an RS-232 receiver in parallel with 1000pF.
Figure 7. Loopback Test Result at 120kbps
Figure 8. 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