MAX3244ECWI+ Maxim Integrated Products, MAX3244ECWI+ Datasheet - Page 15

• Manufacturer Part Number: MAX3244ECWI+
• Description: IC TXRX RS232 250KBPS SD 28-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3244ECWI+

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Propagation Delay Time Ns: 0.15 us
• Operating Supply Voltage: 3 V to 5.5 V
• Supply Current: 1 uA
• Operating Temperature Range: 0 C to + 70 C
• Data Rate: 250 Kbps
• Mounting Style: SMD/SMT
• Number Of I/os: 3 / 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

transmitter is loaded with 3kΩ in parallel with 1000pF.
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 MAX3224E/MAX3226E/MAX3244E maintain the
RS-232 ±5.0V minimum transmitter output voltage even
at high data rates. Figure 9 shows a transmitter loop-
back test circuit. Figure 10 shows a loopback test result
at 120kbps, and Figure 11 shows the same test at
250kbps. For Figure 10, all transmitters were driven
simultaneously at 120kbps into RS-232 loads in parallel
with 1000pF. For Figure 11, a single transmitter was dri-
ven at 250kbps, and all transmitters were loaded with
an RS-232 receiver in parallel with 250pF.
The MAX3225E/MAX3227E/MAX3245E maintain the
RS-232 ±5.0V minimum transmitter output voltage at
data rates up to 1Mbps (MegaBaud). Figure 12 shows
a loopback test result with a single transmitter driven at
1Mbps and all transmitters loaded with an RS-232
receiver in parallel with 250pF.
Figure 9. Loopback Test Circuit
±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V,
*C3 CAN BE RETURNED TO V
RS-232 Transceivers with AutoShutdown Plus
C1
C2
V
V
CC
CC
C
BYPASS
FORCEOFF
C1+
C1-
C2+
C2-
T_ IN
R_ OUT
FORCEON
______________________________________________________________________________________
CC
OR GND.
MAX3224E
MAX3225E
MAX3226E
MAX3227E
MAX3244E
MAX3245E
GND
V
CC
T_ OUT
5kΩ
High Data Rates
R_ IN
V+
V-
C3*
C4
1000pF
Figure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 120kbps
Figure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test
Result at 250kbps
Figure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test
Result at 1Mbps
R1OUT
R1OUT
R1OUT
T1OUT
T1OUT
T1OUT
T1IN
T1IN
T1IN
V
V
V
CC
CC
CC
= 3.3V
= 3.3V
= 3.3V
200ns/div
2μs/div
2μs/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
5V/div
15