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PDF MAX3250 Data sheet ( Hoja de datos )
| Número de pieza | MAX3250 | |
| Descripción | 50V Isolated / 3.0V to 5.5V / 250kbps / 2 Tx/2 Rx / RS-232 Transceiver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX3250 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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19-2443; Rev 1; 2/03
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 Tx/2 Rx, RS-232 Transceiver
General Description
The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated
EIA/TIA-232 and V.28/V.24 communications interface
with high data-rate capabilities. The MAX3250 is a dual
die part that operates with up to ±50V difference
between the RS-232 side and the logic side (ISOCOM
to GND). This makes the device ideal for operation in
noisy conditions with high common-mode voltages.
This feature prevents damage to the device if RS-232
lines are inadvertently short-circuited to a +24V or ±48V
power bus.
The MAX3250 is powered by a single 3V to 5.5V supply
on the logic side. Power is transferred from the logic
side to the isolated side by ±100V external capacitors.
The MAX3250 has two receivers (Rx) and two drivers
(Tx) and is guaranteed to run at data rates of 250kbps
while maintaining RS-232 output levels. The trans-
ceivers have a proprietary low-dropout transmitter out-
put stage, delivering true RS-232 performance from a
3V to 5.5V supply with a dual charge pump. The device
features a FAULT open-drain output to signal an exces-
sive isolated-side voltage condition on any of the RS-
232 inputs. This output can drive an alarm LED or can
be monitored by the processor to prevent operation
under these conditions. The receiver outputs are high
impedance in shutdown, allowing multiple interfaces
(IrDA, RS-232, RS-485) to be connected to the same
UART.
The MAX3250 is available in a space-saving 28-pin
SSOP package.
Applications
Industrial Control
Programmable Logic Controller
Point-of-Sale Equipment
PC-to-Router Connections
Diagnostic Ports
Telecom Equipment
Typical Operating Circuit appears at end of data sheet.
Features
o ±50V Isolation
o 20µA Supply Current in Shutdown
o 250kbps Guaranteed Data Rate
o FAULT Output
o High-Impedance Transmitter and Receiver
Outputs in Shutdown
o Space-Saving SSOP Package
o Inductorless/Transformerless Design Simplifies
EMI Compliance
o Low-Cost Replacement for Opto-Isolated
Transceivers
o Meets EIA/TIA-232 Specifications Down to 3.0V
Ordering Information
PART
MAX3250CAI
MAX3250EAI
TEMP RANGE
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
28 SSOP
28 SSOP
Pin Configuration
TOP VIEW
C1- 1
R1OUT 2
R2OUT 3
T1IN 4
T2IN 5
N.C. 6
N.C. 7
C1+ 8
C3+ 9
V+ 10
C3- 11
C4+ 12
C4- 13
V- 14
MAX3250
SSOP
28 VCC
27 C2-
26 GND
25 FAULT
24 SHDN
23 N.C.
22 N.C.
21 C2+
20 ISOVCC
19 R1IN
18 R2IN
17 T1OUT
16 T2OUT
15 ISOCOM
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
PIN
1
2
3
4
5
6, 22, 23
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
24
25
26
27
28
±50V Isolated, 3.0V to 5.5V,
250kbps, 2 TX/2 RX, RS-232 Transceiver
Pin Description
NAME
C1-
R1OUT
R2OUT
T1IN
T2IN
N.C.
N.C.
C1+
C3+
V+
C3-
C4+
C4-
V-
ISOCOM
T2OUT
T1OUT
R2IN
R1IN
ISOVCC
C2+
SHDN
FAULT
GND
C2-
VCC
FUNCTION
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+.
See Table 1 for values.
TTL/CMOS Receiver Output
TTL/CMOS Receiver Output
TTL/CMOS Transmitter Input
TTL/CMOS Transmitter Input
No Connection. Not internally connected.
No Connection. Leave unconnected or connect to ISOCOM.
Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1+ to C1-.
See Table 1 for values.
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3+ to C3-.
+5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V+ to ISOCOM with a
0.47µF capacitor.
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect a 0.1µF capacitor from
C3- to C3+.
Positive Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4+ to C4-.
Negative Terminal of the Inverting Charge-Pump Capacitor. Connect a 0.47µF capacitor from
C4- to C4+.
-5.5V Generated by the Charge Pump, Referenced to ISOCOM. Bypass V- to ISOCOM with a 0.47µF
capacitor.
Isolated Ground
RS-232 Transmitter Output
RS-232 Transmitter Output
RS-232 Receiver Input
RS-232 Receiver Input
Internally Generated Isolated Power-Supply Voltage, Referenced to ISOCOM. Bypass ISOVCC to
ISOCOM with a 1µF capacitor.
Positive Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2+ to C2-.
See Table 1 for values.
Shutdown Control. Drive SHDN low to enter low-power shutdown mode. Drive SHDN high or connect
to VCC for normal operation.
Overvoltage Indicator. Active low, open drain.
Ground
Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C2- to C2+.
See Table 1 for values.
3.0V to 5.5V Supply Voltage. Bypass VCC to GND with a 1µF capacitor.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX3250.PDF ] | |
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