DS276S Maxim Integrated Products, DS276S Datasheet

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DS276S

Manufacturer Part Number
DS276S
Description
IC TXRX LOW POWER RS-232 8-SOIC
Manufacturer
Maxim Integrated Products
Type
Transceiverr
Datasheet
1.DS276S.pdf (11 pages)

Specifications of DS276S

Number Of Drivers/receivers
1/1
Protocol
RS232
Voltage - Supply
2.7 V ~ 5.5 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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FEATURES
DESCRIPTION
The DS276 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 can be used with independently supplied positive and negative
supplies, but in most cases will be used with the positive supply, sharing the logic supply and the negative
supply stolen from the receive RS-232 signal when that signal is in a negative state (marking). By using
an external reservoir capacitor and Schottky diode (see Figure 4) this negative supply can be maintained
even during full-duplex operation. Since most serial communication ports remain in a negative state
statically, using the receive signal for negative power greatly reduces the DS276’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 DS276’s
transmitter will use system power (3-12 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
Single 3V or 5V operation
Full duplex operation up to 20k bps
Ultra-low static current
Compatible with RS-232-E signals
1 of 11
Low Power Transceiver Chip
PIN ASSIGNMENT
PIN DESCRIPTION
RX
V
TX
GND
TX
V
RX
V
ORDERING INFORMATION
DS276
DS276S
DRV+
DRV-
CC
IN
OUT
OUT
IN
RX
V
GND
TX
DRV+
OUT
IN
DS 276S 8-Pin SOIC (150-mil)
DS276 8-Pin DIP (300-mil)
RS-232 Receiver Output
Transmit Driver Positive Supply
RS-232 Driver Input
System Ground (0V)
RS-232 Driver Output
Transmit Driver Negative Supply
RS-232 Receiver Input
System Logic Supply (3-5V)
8-Pin DIP
8-Pin SOIC
1
2
3
4
8
7
6
5
V
RX
V
TX
CC
DRV-
OUT
IN
DS276
112299

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DS276S Summary of contents

Page 1

... Transmit Driver Positive Supply DRV+ TX RS-232 Driver Input IN GND System Ground (0V) TX RS-232 Driver Output OUT V Transmit Driver Negative Supply DRV- RX RS-232 Receiver Input IN V System Logic Supply (3-5V) CC ORDERING INFORMATION DS276 8-Pin DIP DS276S 8-Pin SOIC DS276 DRV OUT 112299 ...

Page 2

OPERATION Designed for the unique requirements of battery-backed systems, the DS276 provides a low-power full-or half-duplex interface to an RS-232 serial port. Typically, a designer must use an RS-232 device which uses system power during both negative and positive transitions ...

Page 3

As a prime example, the DS276 will not meet the RS-232 requirement that the signal levels be at least 5 volts minimum when terminated =load and V will be present at TX when spacing under ...

Page 4

increased to 5V, and V drv+ devices is possible, although of course the output voltage swing of the DS276 ...

Page 5

NOTES: 1. This circuit as shown does not meet the RS-232 requirement for signal levels (high-level output voltage). However, as most RS-232 receivers will interpret any voltage over space this will normally consequence. Alternatively, ...

Page 6

ABSOLUTE MAXIMUM RATINGS DR OUT RX OUT Operating Temperature Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any ...

Page 7

ELECTRICAL CHARACTERISTICS-3V OPERATION cont’d PARAMETER SYMBOL TX Level Low OUT TX Short Circuit OUT Current TX Output Slew Rate OUT Propagation Delay RX Input Threshold Low IN RX Input Threshold IN High RX Threshold Hysteresis IN RX Output Current OUT ...

Page 8

ELECTRICAL CHARACTERISTICS-5V OPERATION + PARAMETER Logic Supply Voltage Dynamic Supply Current Static Supply Current Driver Leakage Current TX Level High OUT TX Level Low OUT TX Short Circuit Current OUT TX Output Slew Rate OUT Propagation Delay RX Input Threshold ...

Page 9

See test circuit in Figure 12 HYS TH TL DYNAMIC OPERATING CURRENT TEST CIRCUIT Figure 5 STATIC OPERATING CURRENT TEST CIRCUIT Figure ...

Page 10

DRIVER LEAKAGE TEST CIRCUIT Figure 7 PROPAGATION DELAY TEST CIRCUIT Figure 8 DYNAMIC OPERATING CURRENT TEST CIRCUIT Figure DS276 ...

Page 11

STATIC OPERATING CURRENT TEST CIRCUIT Figure 10 DRIVER LEAKAGE TEST CIRCUIT Figure 11 PROPAGATION DELAY TEST CIRCUIT Figure DS276 ...

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