DS232AS/T&R datasheet, PDF - EEWORLD Datasheet

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DS232AS/T&R: DescriptionLine Transceiver, 1 Func, 2 Driver, 2 Rcvr, CMOS, PDSO16, 0.300 INCH, SOIC-16; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size163KB，10 Pages; ManufacturerRochester Electronics; Websitehttps://www.rocelec.com/

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DS232AS/T&R Overview

Line Transceiver, 1 Func, 2 Driver, 2 Rcvr, CMOS, PDSO16, 0.300 INCH, SOIC-16

DS232AS/T&R Parametric

Parameter Name	Attribute value
Maker	Rochester Electronics
package instruction	SOP,
Reach Compliance Code	unknown
ECCN code	EAR99
Other features	EXTERNAL CHARGE PUMP
Differential output	NO
Number of drives	2
Input properties	SCHMITT TRIGGER
Interface integrated circuit type	LINE TRANSCEIVER
Interface standards	EIA-232-E; V.24; V.28
JESD-30 code	R-PDSO-G16
JESD-609 code	e0
length	10.3 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Maximum receive delay	1000 ns
Number of receiver bits	2
Maximum seat height	2.65 mm
Maximum supply voltage	5.5 V
Minimum supply voltage	4.5 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	TIN LEAD
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
maximum transmission delay	3500 ns
width	7.5 mm

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DS232A

Dual RS-232 Transmitter/Receiver

www.maxim-ic.com

FEATURES

Compatible with LT1181A and MAX232A

High data rate - 250 kbits/sec under load

16-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

16-Pin DIP AND SOIC

C1+

V+

C1-

C2+

C2-

V-

OUT

GND

OUT

ORDERING INFORMATION

DS232A

DS232A-N

DS232AR

DS232AR-N

DS232AS

DS232AS-N

DS232AE

DS232AE-N

16-pin DIP

16-pin DIP (Industrial)

16-pin SOIC (150-Mil)

16-pin SOIC (150-Mil) (Industrial)

16-pin SOIC (300-Mil)

16-pin SOIC (300-Mil) (Industrial)

20-pin TSSOP

20-pin TSSOP (Industrial)

20-Pin TSSOP

PIN DESCRIPTION

GND

V+

V-

, T2

OUT

, T2

OUT

, R2

OUT

, R2

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 DS232A is a dual 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 DS232A uses on-board charge

pumps to convert the +5-volt supply to

±10

volts. The DS232A is fully compliant with EIA RS-232E and

V.28/V.24 standards. The DS232A contains two drivers and two receivers. Driver slew rates and data

rates are guaranteed up to 250k bits/sec. The DS232A operates with only 0.1

μF

charge pump capacitors.

OPERATION

The diagram in Figure 1 shows the main elements of the DS232A. The following paragraphs describe the

function of each pin.

1 of 10

112099

DS232A

, R2

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

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 DS232A 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 DS232A to provide the necessary

output levels for RS-232 communication. The DS232A 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.

RS-232 DRIVERS

The two 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-volt

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 250k bits/s. Driver outputs maintain high impedance when power is off.

RS-232 RECEIVERS

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

kΩ and can withstand up to

±25

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 10

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