Datasheet DS14C238WMX, DS14C238WM Datasheet (NSC)

DS14C238
Single Supply TIA/EIA-2324x4Driver/Receiver

DS14C238 Single Supply TIA/EIA-2324x4Driver/Receiver

May 1999

General Description

The DS14C238 is a four driver, four receiver device which
conforms to the TIA/EIA-232-E standard and CCITT V.28
recommendations. This device eliminates
employing an internal DC-DCconverter to generate the nec­essary output levels from a single +5V supply. Driver slew
rate control and receiver noise filtering have also been inter­nalized to eliminate the need for external slew rate control
and noise filtering capacitors.

±

12V supplies by

Features

n Conforms to TIA/EIA-232-E and CCITT V.28
n Internal DC-DC converter
n Operates with single +5V supply
n Low power requirement—I
n Internal driver slew rate control
n Receiver noise filtering
n Operates above 120 kbits/sec
n Direct replacement for MAX238

CC

Connection Diagram Functional Diagram

DS011282-1

Order Number DS14C238WM

See NS Package Number M24B

10 mA max

DS011282-2

© 1999 National Semiconductor Corporation DS011282 www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage (V
V+ Pin (V
V− Pin +0.3V to −15V
Driver Input Voltage −0.3V to (V
Driver Output Voltage (V+ +0.3V) to (V−

Receiver Input Voltage
Receiver Output Voltage −0.3V to (V
Junction Temperature +150˚C
Maximum Package Power Dissipation

) −0.3V to +6V

CC

−0.3V) to +15V

CC

@

+25˚C (Note 6)

CC

CC

+0.3V)

−0.3V)

±

30V

+0.3V)

Lead Temp.

(Soldering, 4 Seconds) +260˚C

Short Circuit Duration

) Continuous

(D

OUT

ESD Rating

(HBM, 1.5 kΩ, 100 pF) ≥ 2.0 kV

Recommended Operating
Conditions

Min Max Units

Supply Voltage, V
Operating Free Air Temp. (T

DS14C238 0 +70 ˚C

4.5 5.5 V

CC

)

A

WM Package 1400 mW

Storage Temp. Range −65˚C to +150˚C

Electrical Characteristics (Note 2)

Over recommended operating conditions, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DEVICE CHARACTERISTICS

V+ Positive Power Supply R
V− Negative Power Supply R
I

CC

Supply Current (VCC) No Load 7.0 10 mA

DRIVER CHARACTERISTICS

V

IH

V

IL

I

IH

I

IL

V

OH

V

OL

I

OS

High Level Input Voltage 2.0 V
Low Level Input Voltage GND 0.8 V
High Level Input Current VIN≥ 2.0V −10 +10 µA
Low Level Input Current VIN≤ 0.8V −10 +10 µA
High Level Output Voltage RL=3kΩ 5.0 7.4 V
Low Level Output Voltage −6.3 −5.0 V

+ Output High Short VO= 0V, VIN= 0.8V (Note 3) −30 −15 −5.0 mA

Circuit Current

I

− Output Low Short VO= 0V, VIN= 2.0V 5.0 12 30 mA

OS

Circuit Current

R

O

Output Resistance −2V ≤ VO≤ +2V, VCC= GND = 0V 300 Ω

RECEIVER CHARACTERISTICS

V

TH

V

TL

V

HY

R

IN

I

IN

V

OH

V

OL

Input High Threshold
Voltage

Input Low Threshold
Voltage

Hysteresis 0.2 0.4 1.0 V
Input Resistance 3.0 4.5 7.0 kΩ
Input Current VIN= +15V 2.14 3.8 5.0 mA

High Level Output Voltage VIN= −3V, IO= −3.2 mA 3.5 4.5 V

Low Level Output Voltage VIN= +3V, IO= +2.0 mA 0.25 0.4 V

=3kΩ, C1–C4 = 1.0 µF, DIN= 0.8V 9.0 V

L

=3kΩ, C1–C4 = 1.0 µF, DIN= 2.0V −8.0 V

L

CC

1.9 2.4 V

0.8 1.5 V

V

= +3V 0.43 0.6 +1.0 mA

IN

V

= −3V −1.0 −0.6 −0.43 mA

IN

V

= −15V −5.0 −3.8 −2.14 mA

IN

V

= −3V, IO= −20 µA 4.0 4.9 V

IN

V

www.national.com 2

Switching Characteristics (Note 4)

Over recommended operating conditions, unless otherwise specified.

Symbol Parameter Conditions Min Typ Max Units

DRIVER CHARACTERISTICS

t

PLH

t

PHL

t

sk

SR1 Output Slew Rate R
SR2 Output Slew Rate R

Propagation Delay LOW to HIGH RL=3kΩ 0.7 4.0 µs
Propagation Delay HIGH to LOW CL= 50 pF 0.6 4.0 µs
Skew |t

PLH–tPHL

|(

Figures 1, 2

L
L

) 0.1 1.0 µs
=3kΩto7kΩ,CL= 50 pF 4.0 15 30 V/µs
=3kΩ,CL= 2500 pF 3.0 5.0 V/µs

RECEIVER CHARACTERISTICS

t

PLH

t

PHL

t

SK

t

NW

Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.

Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise speci­fied.

Note 3: I
Note 4: Receiver AC input waveform for test purposes: t

t

r=tf

Note 5: All typicals are given for V
Note 6: Ratings apply to ambient temperature at +25˚C. Above this temperature derate: WM package 13.5 mW/˚C.

Propagation Delay LOW to HIGH Input Pulse Width>10 µs 2.0 6.5 µs
Propagation Delay HIGH to LOW CL= 50 pF 2.8 6.5 µs
Skew | t

PLH–tPHL

Noise Pulse Width Rejected (

+ and IOS− values are for one output at a time. If more than one output is shorted simultaneously, the device power dissipation may be exceeded.

OS

≤10 ns, VIH=3V,VIL=0V,f=64kHz(128 kbits/sec).

|(

= 5.0V and TA= +25˚C.

CC

Figures 3, 4
Figures 3, 4

= 200 ns, VIH=3V,VIL=−3V,f=64kHz(128 kbits/sec). Driver AC input waveform for test purposes:

r=tf

) 0.8 2.0 µs

) 2.5 1.0 µs

Parameter Measurement Information

DS011282-4

FIGURE 1. Driver Load Circuit

FIGURE 2. Driver Switching Waveform

DS011282-6

FIGURE 3. Receiver Load Circuit

DS011282-5

www.national.com3

Parameter Measurement Information (Continued)

FIGURE 4. Receiver Propagation Delays and Noise Rejection

Pin Descriptions

VCC(pin 9) — Power supply pin for the device,

±

10%).

+5V (
V+ (pin 11)— Positive supply for TIA/EIA-232-E drivers.

Recommended external capacitor: C4 = 1.0 µF (6.3V). This
supply is not intended to be loaded externally.

V− (pin 15) — Negative supply for TIA/EIA-232-E drivers.
Recommended external capacitor: C3 = 1.0 µF (16V). This
supply is not intended to be loaded externally.

C1+, C1− (pins 10 and 12) — External capacitor connection
pins. Recommended capacitor – 1.0 µF (6.3V).

C2+, C2− (pins 13 and 14)— External Capacitor connec­tion pins. Recommended capacitor – 1.0 µF (16V).

D

1–4 (pins 5, 18, 19, and 21)— Driver input pins are

IN

TTL/CMOS compatible. Inputs of unused drivers may be left

open, an internal pull-up resistor (500 kΩ minimum, typically
5MΩ) pulls input to V

D

OUT

form to TIA/EIA-232-E levels.

R

IN1

cept TIA/EIA-232-E input voltages (
ture a noise filter and guaranteed hysteresis of 200 mV. Un­used receiver input pins may be left open. Internal input
resistor (5 kΩ) pulls input LOW, providing a failsafe HIGH
output.

R

OUT

are TTL/CMOS compatible. Receiver output HIGH voltage is
specified for both CMOS and TTL load conditions.

GND (pin 8) — Ground Pin.

DS011282-7

. Output will be LOW for open inputs.

CC

1–4 (pins 2, 1, 24, and 20) — Driver output pins con-

1–4 (pins 3, 7, 23, and 16) — Receiver input pins ac-

±

15V). Receivers fea-

1–4 (pins 4, 6, 22, and 17) — Receiver output pins

www.national.com 4

Physical Dimensions inches (millimeters) unless otherwise noted

Order Number DS14C238WM

NS Package Number M24B

DS14C238 Single Supply TIA/EIA-2324x4Driver/Receiver

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