MAX13234EETP Maxim Integrated, MAX13234EETP Datasheet - Page 14

• Manufacturer Part Number: MAX13234EETP
• Description: RS-232 Interface IC
• Manufacturer: Maxim Integrated
• Series: MAX13234E, MAX13235E, MAX13236E, MAX13237Er

Specifications of MAX13234EETP

• Data Rate: 250 Kbps
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 mA
• Operating Temperature Range: - 40 C to + 85 C
• Function: Transceiver
• Number Of Drivers: 2
• Number Of I/os: 8
• Number Of Receivers: 2
• Propagation Delay Time Ns: 0.15 us
• Shutdown: Yes

3Mbps RS-232 Transceivers with
Low-Voltage Interface
The MAX13234E–MAX13237E maintain the RS-232 ±5V
minimum transmitter output voltage even at high data
rates. Figure 11 shows a transmitter loopback test cir-
cuit. Figure 12 shows a loopback test result at
120kbps, and Figure 13 shows the same test at 3Mbps.
Figure 11. Loopback Test Circuit
14
C1
C2
V
*C3 CAN BE RETURNED TO V
CC
______________________________________________________________________________________
C
BYPASS1
FORCEON
FORCEOFF
C1+
C1-
C2+
C2-
T_IN
R_OUT
1.62V to V
V
CC
L
MAX13236E
MAX13237E
OR GND.
CC
GND
V
V
CC
CC
High Data Rates
5kΩ
T_OUT
R_IN
V+
V-
C
BYPASS2
C3*
C4
1000pF
In Figure 12, all transmitters were driven simultaneously
at 120kbps into RS-232 loads in parallel with 1000pF.
In Figure 13, a single transmitter was driven at 3Mbps,
and all transmitters were loaded with an RS-232 receiv-
er in parallel with 150pF.
Figure 12. Loopback Test Results at 120kbps
Figure 13. Loopback Test Results at 3Mbps
PROCESS: BiCMOS
R1OUT
T1OUT
R1OUT
T1OUT
T1IN
T1IN
V
V
CC
CC
= 3.3V
= 3.3V
100ns/div
2µs/div
Chip Information
3.3V/div
5V/div
3.3V/div
3V/div
5V/div
5V/div