DS229E+T&R; datasheet, PDF - EEWORLD Datasheet

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DS229E+T&R;: DescriptionIC TXRX TRI 5V RS-232 20-TSSOP; Categorysemiconductor Analog mixed-signal IC; File Size96KB，9 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html; Environmental Compliance

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DS229E+T&R; Overview

IC TXRX TRI 5V RS-232 20-TSSOP

DS229E+T&R; Parametric

Parameter Name	Attribute value
type	transceiver
protocol	RS232
Number of drivers/receivers	3/3
duplex	Complete
receiver lag	500mV
data rate	200kbps
Voltage - Power	4.5 V ~ 5.5 V
Operating temperature	-40°C ~ 85°C
Installation type	surface mount
Package/casing	20-TSSOP (0.173", 4.40mm wide)
Supplier device packaging	20-TSSOP

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DS229

Triple RS-232 Transmitter/Receiver

www.dalsemi.com

FEATURES

Compatible with DS1229

5V operation

20-pin DIP or SOIC package

20-pin TSSOP package for height restricted

applications

Operate from single +5V power

Meets all EIA-232E and V.28 specifications

Uses small capacitors: 0.1

µF

Optional industrial temperature range

available (-40°C to +85°C)

PIN ASSIGNMENT

C1+

V+

C1-

C2+

C2-

V-

OUT

GND

OUT

20-Pin DIP, SOIC AND TSSOP

ORDERING INFORMATION

DS229

DS229N

DS229S

DS229SN

DS229E

DS229EN

20-pin DIP

20-pin DIP (Industrial)

20-pin SOIC

20-pin SOIC (Industrial)

20-pin TSSOP

20-pin TSSOP (Industrial)

PIN DESCRIPTION

GND

V+

V-

, T2

, T3

OUT

, T2

OUT

, T3

OUT

, R2

, R3

OUT

, R2

OUT

, R3

OUT

C1+, C1-

C2+, C2-

- +5-Volt Supply

- Ground

- Positive Supply Output

- Negative Supply Output

- RS-232 Driver Inputs

- RS-232 Driver Outputs

- Receiver Inputs

- Receiver Outputs

- Capacitor 1 Connections

- Capacitor 2 Connections

DESCRIPTION

The DS229 is a triple RS-232 driver/receiver pair that generates RS-232 voltage levels from a single +5-

volt power supply. Additional

±12-volt

supplies are not needed since the DS229 uses on-board charge

pumps to convert the +5-volt supply to

±10

volts. The DS229 is fully compliant with EIA RS-232E and

V.28/V.24 standards. The DS229 contains three drivers and three receivers. Driver slew rates and data

rates are guaranteed up to 116 kbits/sec. The DS229 operates with only 0.1

µF

charge pump capacitors.

OPERATION

The diagram in Figure 1 shows the main elements of the DS229. The following paragraphs describe the

function of each pin.

1 of 9

112099

DS229

V-:

Negative supply output (RS-232). V- requires an external storage capacitor of at least 0.1

µF.

larger capacitor (up to 10

µF)

can be used to reduce supply ripple.

, T2

, T3

Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers can

be left unconnected since each input has a 400 kΩ pullup resistor.

OUT

, T2

OUT

, T3

OUT

Driver outputs at RS-232 levels. Driver output swing meets RS-232 levels for

loads up to 3 kΩ. These driver outputs provide current necessary to meet RS-232 levels for loads up to

2500 pF.

, R2

, R3

Receiver inputs. These inputs accept RS-232 level signals (±25 volts) into a protected

5 kΩ terminating resistor. Each receiver provides 0.5V hysteresis (typical) for noise immunity.

OUT

, R2

OUT

, R3

OUT

Receiver outputs at TTL/CMOS levels.

C1+, C1-, C2+, C2-:

Charge pump capacitor inputs. These pins require two external capacitors (0.1

µF

minimum, 10

µF

maximum and should be the same size as C3 and C4). Capacitor 1 is connected between

C1+ and C1-. Capacitor 2 is connected between C2+ and C2-. Capacitor C1 can be omitted if +12 volts is

connected directly to V+. Likewise, C2 can be omitted if -12V is connected directly to V-.

DUAL CHARGE PUMP CONVERTERS

The DS229 has a two stage on-board charge pump circuit that is used to generate

±10

volts from a single

+5-volt supply. In the first stage, capacitor C1 doubles the +5V supply to +10 volts which is then stored

on capacitor C3. The second stage uses capacitor C2 to invert the +10V potential to -10V. This charge is

then stored on capacitor C4. The

±10-volt

supplies allow the DS229 to provide the necessary output

levels for RS-232 communication. The DS229 will operate with charge pump capacitors as low as 0.1

µF.

Larger capacitors (up to 10

µF)

can be used to reduce supply ripple.

The three RS-232 drivers are powered by the internal

±10-volt

supplies generated by the on-board charge

pump. The driver inputs are both TTL and CMOS compatible. Each input has an internal 400 kΩ=pullup

resistor so that unused transmitter inputs can be left unconnected. The open circuit output voltage swing

is from (V+ - 0.6) to V- volts. Worst case conditions for EIA-232E/V.28 of

±5

volts driving a 3 kΩ=load

and 2500 pF are met at maximum operating temperature and V

equal to 4.5 volts. Typical voltage

swings of

±8

volts occur when loaded with a nominal 5 kΩ=RS-232 receiver. As required by EIA-232E

and V.28 specifications, the slew rate at the output is limited to less than 30 volts/µs. Typical slew rates

are 20 volts/µs unloaded and 12 volts/µs with 3 kΩ=and 2500 pF load. These slew rates allow for bit rates

of over 116 kbits/s. Driver outputs maintain high impedance when power is off.

RS-232 DRIVERS

RS-232 RECEIVERS

The three receivers conform fully to the RS-232E specifications. The input impedance is typically 5

kΩ=and can withstand up to

±30

volts with or without V

applied. The input switching thresholds are

within the

±3-volt

limit of RS-232E specification with an input threshold low of 0.8 volts and an input

threshold high of 2.4 volts. The receivers have 0.5 volts of hysteresis (typical) to improve noise rejection.

The TTL/CMOS compatible outputs of the receivers will be low whenever the RS-232 input is greater

than 2.4 volts. The receiver output will be high when the input is floating or driven between +0.8 volts

and -25 volts.

3 of 9

DS229E+T&R; Related Products

	DS229E+T&R;	DS229S/T&R	DS229S/T&R;	DS229SN+	DS229+	DS229E+	DS229N+	DS229S+T&R;
Description	IC TXRX TRI 5V RS-232 20-TSSOP	IC txrx tri 5V RS-232 ind 20soic	IC TXRX TRI 5V RS-232 IND 20SOIC	IC TXRX RS-232 TRIPLE 20-SOIC	IC TXRX TRI 5V RS-232 20-DIP	IC TXRX TRI 5V RS-232 20-TSSOP	IC TXRX TRI 5V RS-232 20-DIP	IC TXRX TRI 5V RS-232 20-SOIC

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