DS275+ Maxim Integrated Products, DS275+ Datasheet

IC TXRX LINE-PWR RS232 8-DIP

DS275+

Manufacturer Part Number
DS275+
Description
IC TXRX LINE-PWR RS232 8-DIP
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.DS275.pdf (8 pages)

Specifications of DS275+

Number Of Drivers/receivers
1/1
Protocol
RS232
Voltage - Supply
4.5 V ~ 5.5 V
Mounting Type
Through Hole
Package / Case
8-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
ORDERING INFORMATION
DS275
DS275S
DS275E
DESCRIPTION
The DS275 Line-Powered RS-232 Transceiver Chip is a CMOS device that provides a low-cost, very
low-power interface to RS-232 serial ports. The receiver input translates RS-232 signal levels to common
CMOS/TTL levels. The transmitter employs a unique circuit which steals current from the receive RS-
232 signal when that signal is in a negative state (marking). Since most serial communication ports
remain in a negative state statically, using the receive signal for negative power greatly reduces the
DS275’s static power consumption. This feature is especially important for battery-powered systems such
as laptop computers, remote sensors, and portable medical instruments. During an actual communication
session, the DS275’s transmitter will use system power (5-12 volts) for positive transitions while still
employing the receive signal for negative transitions.
www.dalsemi.com
Low-power serial transmitter/receiver for
battery-backed systems
Transmitter steals power from receive signal
line to save power
Ultra-low static current, even when connected
to RS-232-E port
Variable transmitter level from +5 to +12
volts
Compatible with RS-232-E signals
Available in 8-pin, 150 mil wide SOIC
package (DS275S)
Low-power CMOS
8-pin DIP
8-pin SOIC
14-pin TSSOP
Line-Powered RS-232 Transceiver Chip
1 of 8
PIN ASSIGNMENT
PIN DESCRIPTION
RX
V
TX
GND
TX
NC
RX
V
DRV
CC
IN
OUT
OUT
IN
DS275 8-Pin SOIC (150-mil)
RX
DS275 8-Pin DIP (300-mil)
GND
RX
V
TX
GND
NC
NC
NC
OUT
DRV
V
TX
DS275E 14-Pin TSSOP
OUT
DRV
IN
IN
- RS-232 Receiver Output
- Transmit driver +V
- RS-232 Driver Input
- System Ground (0V)
- RS-232 Driver Output
- No Connection
- RS-232 Receive Input
-System Logic Supply (+5V)
1
2
3
4
5
6
7
1
2
3
4
8
7
6
5
14
13
12
11
10
9
8
V
RX
NC
TX
V
NC
NC
RX
NC
NC
TX
CC
OUT
CC
IN
OUT
IN
DS275
112299

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DS275+ Summary of contents

Page 1

FEATURES Low-power serial transmitter/receiver for battery-backed systems Transmitter steals power from receive signal line to save power Ultra-low static current, even when connected to RS-232-E port Variable transmitter level from +5 to +12 volts Compatible with RS-232-E signals Available ...

Page 2

DS275 BLOCK DIAGRAM Figure 1 OPERATION Designed for the unique requirements of battery-backed systems, the DS275 provides a low-power half- duplex interface to an RS-232 serial port. Typically, a designer must use an RS-232 device which uses system power during ...

Page 3

V V must be greater than or equal to V DRV The voltage range on V permits the use of a 9-volt battery in order to ...

Page 4

In this situation, the full-duplex circuit shown in Figure 3 can be used as analternative. The 22 ...

Page 5

OUT RX OUT Storage Temperature Operating Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this ...

Page 6

DC ELECTRICAL CHARACTERISTICS ( PARAMETER TX Level High OUT TX Level Low OUT TX Short Circuit Current OUT TX Output Slew Rate OUT Propagation Delay RX Input Threshold Low IN RX Input Threshold High IN ...

Page 7

DYNAMIC OPERATING CURRENT TEST CIRCUIT Figure 4 STATIC OPERATING CURRENT TEST CIRCUIT Figure 5 DRIVER LEAKAGE TEST CIRCUIT Figure DS275 ...

Page 8

PROPAGATION DELAY TEST CIRCUIT Figure 7 DS275E 14-PIN TSSOP DIM phi DS275 14-PIN MIN MAX ...

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