MAX3384ECWN-T Maxim Integrated, MAX3384ECWN-T Datasheet - Page 8

• Manufacturer Part Number: MAX3384ECWN-T
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX3384Er

Specifications of MAX3384ECWN-T

• Data Rate: 250 Kbps
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: 0 C to + 70 C
• Mounting Style: SMD/SMT
• Function: Transceiver
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.15 us
• Shutdown: Yes

±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
Figure 2 shows two transmitter outputs when exiting
shutdown mode. As they become active, the two trans-
mitter outputs are shown going to opposite RS-232 lev-
els (one transmitter input is high, the other is low). Each
transmitter is loaded with 3kΩ in parallel with 2500pF.
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.
Figure 6. Loopback Test Circuit
8
_______________________________________________________________________________________
C1
C2
V
V
CC
CC
0.1µF
SHDN
T_ IN
R_ OUT
C1+
C1-
C2+
C2-
Transmitter Outputs when
MAX3384E
GND
V
CC
Exiting Shutdown
T_ OUT
5kΩ
R_ IN
V+
V-
C3
C4
1000pF
The MAX3384E maintains the RS-232 ±5.0V minimum
transmitter output voltage even at high data rates.
Figure 6 shows a transmitter loopback test circuit.
Figure 7 shows a loopback test result at 120kbps, and
Figure 8 shows the same test at 250kbps. For Figure 7,
all transmitters were driven simultaneously at 120kbps
into RS-232 loads in parallel with 1000pF. For Figure 8,
a single transmitter was driven at 250kbps, and all
transmitters were loaded with an RS-232 receiver in
parallel with 1000pF.
Figure 8. MAX3384E Loopback Test Result at 250kbps
Figure 7. MAX3384E Loopback Test Result at 120kbps
T1OUT
R1OUT
T1IN
R1OUT
T1OUT
T1IN
V
C1–C4 = 0.1µF
CC
= 3.3V
V
C1–C4 = 0.1µF
CC
= 3.3V
2µs/div
2µs/div
High Data Rates
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div