MAX3385EEAP Maxim Integrated Products, MAX3385EEAP Datasheet - Page 8

• Manufacturer Part Number: MAX3385EEAP
• Description: Dual Transmitter/Receiver RS-232 20-Pin SSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX3385EEAP

• Package: 20SSOP
• Data Transmission Topology: Point-to-Point
• Interface Standards: EIA/TIA-232|RS-232|V.24|V.28
• Data Rate: 0.25(Min) Mbps
• Function: Line Transmitter/Receiver
• Number Of Transceivers: 1
• Number Of Transmitters: 2
• Transmitter Signal Type: Single-Ended
• Transmitter Communication Type: RS-232
• Typical Single Supply Voltage: 3.3|5 V

±15kV ESD-Protected, 3.0V to 5.5V, Low-Power,
up to 250kbps, True RS-232 Transceiver
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.
The MAX3385E 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 6. Loopback Test Circuit
8
_______________________________________________________________________________________
C1
C2
V
V
CC
CC
0.1µF
SHDN
T_ IN
R_ OUT
C1+
C1-
C2+
C2-
MAX3385E
GND
V
CC
T_ OUT
5k
High Data Rates
R_ IN
V+
V-
C3
C4
1000pF
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.
The MAX3385E can directly interface with various 5V
logic families, including ACT and HCT CMOS. See
Table 3 for more information on possible combinations
of interconnections.
Figure 8. MAX3385E Loopback Test Result at 250kbps
Figure 7. MAX3385E Loopback Test Result at 120kbps
R1OUT
T1OUT
R1OUT
T1OUT
T1IN
T1IN
Interconnection with 3V and 5V Logic
V
C1–C4 = 0.1µF
CC
= 3.3V
V
C1–C4 = 0.1µF
CC
= 3.3V
2µs/div
2µs/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div