MAX3250EAI+ Maxim Integrated Products, MAX3250EAI+ Datasheet

IC TXRX RS-232 250KBPS 28-SSOP

MAX3250EAI+

Manufacturer Part Number
MAX3250EAI+
Description
IC TXRX RS-232 250KBPS 28-SSOP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet

Specifications of MAX3250EAI+

Number Of Drivers/receivers
2/2
Protocol
RS232
Voltage - Supply
3 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
28-SSOP
Propagation Delay Time Ns
0.4 us
Operating Supply Voltage
3 V to 5.5 V
Supply Current
15 mA
Operating Temperature Range
- 40 C to + 85 C
Data Rate
250 Kbps
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-2443; Rev 2; 1/08
Typical Operating Circuit appears at end of data sheet.
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Industrial Control
Programmable Logic Controller
Point-of-Sale Equipment
PC-to-Router Connections
Diagnostic Ports
Telecom Equipment
________________________________________________________________ Maxim Integrated Products
250kbps, 2 Tx/2 Rx, RS-232 Transceiver
General Description
Applications
±50V Isolated, 3.0V to 5.5V,
o ±50V Isolation
o 20µA Supply Current in Shutdown
o 250kbps Guaranteed Data Rate
o FAULT Output
o High-Impedance Transmitter and Receiver
o Space-Saving SSOP Package
o Inductorless/Transformerless Design Simplifies
o Low-Cost Replacement for Opto-Isolated
o Meets EIA/TIA-232 Specifications Down to 3.0V
MAX3250CAI
MAX3250EAI
Outputs in Shutdown
EMI Compliance
Transceivers
TOP VIEW
PART
R1OUT
R2OUT
T1IN
T2IN
N.C.
N.C.
C1+
C3+
C4+
C1-
C3-
C4-
V+
V-
10
11
12
13
14
1
2
3
4
5
6
7
8
9
-40°C to +85°C
TEMP RANGE
Ordering Information
0°C to +70°C
MAX3250
SSOP
Pin Configuration
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
C2-
GND
FAULT
SHDN
N.C.
N.C.
C2+
ISOV
R1IN
R2IN
T1OUT
T2OUT
ISOCOM
PIN-PACKAGE
28 SSOP
28 SSOP
CC
Features
CC
1

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MAX3250EAI+ Summary of contents

Page 1

... Point-of-Sale Equipment PC-to-Router Connections Diagnostic Ports Telecom Equipment Typical Operating Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ±50V Isolated, 3.0V to 5.5V, o ±50V Isolation o 20µ ...

Page 2

Isolated, 3.0V to 5.5V, 250kbps, 2 TX/2 RX, RS-232 Transceiver ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) V ...........................................................................-0.3V to +6V CC ISOCOM...............................................................................±80V ISOV to ISOCOM..................................................-0. ISOCOM (Note 1)............................................-0.3V to ...

Page 3

TX/2 RX, RS-232 Transceiver ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.0V to 5.5V, see Typical Operating Circuit and Table 1 for capacitor values, ISOCOM = GND TMIN to TMAX, unless otherwise noted. Typical values are at VCC ...

Page 4

Isolated, 3.0V to 5.5V, 250kbps, 2 TX/2 RX, RS-232 Transceiver (V = 3.3V, 250kbps data rate, see Typical Operating Circuit and Table 1 for capacitor values, all transmitters loaded with 3kΩ and ISOCOM +25°C, ...

Page 5

TX/2 RX, RS-232 Transceiver PIN NAME Negative Terminal of the Power Isolation Capacitor. Connect a 100V capacitor from C1- to C1+. 1 C1- See Table 1 for values. 2 R1OUT TTL/CMOS Receiver Output 3 R2OUT TTL/CMOS Receiver Output ...

Page 6

Isolated, 3.0V to 5.5V, 250kbps, 2 TX/2 RX, RS-232 Transceiver TIN1 ROUT1 TIN2 ROUT2 SHDN FAULT OSC V CC Figure 1. Functional Diagram Detailed Description The MAX3250 is a 3.0V to 5.5V powered, ±50V isolated EIA/TIA-232 and V.28/V.24 communications ...

Page 7

TX/2 RX, RS-232 Transceiver AC waveforms are rectified on the isolated side of the dual die to power its internal circuitry (ISOV Capacitor C6 filters the output of the rectifier. See the Typical Operating Circuit . The power ...

Page 8

Isolated, 3.0V to 5.5V, 250kbps, 2 TX/2 RX, RS-232 Transceiver Table 1. Required Capacitor Values V (V) C1, C2 (µF) CC 3.0 to 3.6 0.47 4.5 to 5.5 0.047 To achieve full isolation capability, C1, C2, and C9 should ...

Page 9

TX/2 RX, RS-232 Transceiver 1μF C1 0.47μF C2 0.47μF Chip Information TRANSISTOR COUNT: 2094 PROCESS: BiCMOS _______________________________________________________________________________________ ±50V Isolated, 3.0V to 5.5V RIN1 TOUT1 FAULT RIN2 SHDN TOUT2 C4+ TIN1 C4 ROUT1 MAX3250 ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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