MAX3322EEUP+ Maxim Integrated Products, MAX3322EEUP+ Datasheet - Page 10

• Manufacturer Part Number: MAX3322EEUP+
• Description: IC TXRX RS232 250KBPS 20TSSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3322EEUP+

• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

In most circumstances, a 0.1µF bypass capacitor is ade-
quate. In applications sensitive to power-supply noise,
decouple V
value as charge-pump capacitor C1. Connect bypass
capacitors as close to the IC as possible.
The MAX3322E/MAX3323E maintain the RS-232 ±5.0V
minimum transmitter output voltage even at high data
rates. Figure 10 shows a transmitter loopback test cir-
cuit. Figure 11 shows a loopback test result at
125kbps, and Figure 12 shows the same test at
250kbps. For Figure 11, all transmitters were driven
simultaneously at 125kbps into RS-232 loads in parallel
with 1000pF. For Figure 12, a single transmitter was dri-
ven at 250kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 1000pF.
±15kV ESD-Protected, RS-232 Transceivers for
Multidrop Applications
Figure 10. Loopback Test Circuit
10
0.1µF
0.1µF
0.1µF
C1
C2
______________________________________________________________________________________
+3.3V
CC
1
3
4
5
T_IN
C1+
C1-
C2+
C2-
R_OUT
to ground with a capacitor of the same
SHDN
MAX3323E
Power-Supply Decoupling
GND
V
CC
T_OUT
High Data Rates
R_IN
5kΩ
V+
V-
2
6
C3
0.1µF
C4
0.1µF
1000pF
The MAX3322E/MAX3323E can directly interface with
various 5V logic families, including ACT and HCT
CMOS. The logic voltage power-supply pin V
output voltage level of the receivers and the input
thresholds of the transmitters.
Figure 11. Loopback Test Results at 125kbps
Figure 12. Loopback Test Results at 250kbps
Interconnection with 3V and 5V Logic
V
V
CC
CC
= 3.3V
= 3.3V
2µs/div
1µs/div
MAX3322E fig11
MAX3322E fig12
R1OUT
5V/div
R1OUT
5V/div
T1OUT
5V/div
T1OUT
5V/div
T1IN
5V/div
T1IN
5V/div
L
sets the