MAX3245ECUI-T Maxim Integrated, MAX3245ECUI-T Datasheet - Page 15
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MAX3245ECUI-T
Manufacturer Part Number
MAX3245ECUI-T
Description
RS-232 Interface IC
Manufacturer
Maxim Integrated
Series
MAX3224E, MAX3225E, MAX3226E, MAX3227E, MAX3244E, MAX3245Er
Datasheet
1.MAX3245EEWI.pdf
(21 pages)
Specifications of MAX3245ECUI-T
Data Rate
1 Mbps
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
3
Number Of I/os
16
Number Of Receivers
5
Propagation Delay Time Ns
0.15 us
Shutdown
Yes
Maxim Integrated
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,
MAX3226E/MAX3227E/MAX3244E/MAX3245E
*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
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