MAX3180EEUK+T Datasheet MAX3180EUK+T, MAX3180EEUK+T, MAX3182EEUK+T | P4-P6

Detailed Description

The MAX3180E–MAX3183E are EIA/TIA-232 and V.28/

V.24 communications receivers that convert RS-232

signals to CMOS logic levels. They operate on a +3V to

+5.5V supply, have 1.5Mbps data rate capability, and

feature enhanced electrostatic discharge (ESD) protec-

tion (see

ESD Protection

). All of these devices achieve

a typical supply current of 0.5µA. The MAX3180E/

MAX3182E have a receiver enable control (EN). The

MAX3181E/MAX3183E contain a signal invalid output

(INVALID). The MAX3180E/MAX3181E invert the ROUT

signal relative to RIN (standard RS-232). The

MAX3182E/MAX3183E outputs are not inverted. The

devices come in tiny SOT23-5 packages.

MAX3180E–MAX3183E

±15kV ESD-Protected, 0.5µA, +3V to +5.5V,

1.5Mbps RS-232 Receivers in SOT23-5

4 _______________________________________________________________________________________

3.0 3.5 4.0 4.5 5.0 5.5

RIN TO INVALID LOW vs. V

MAX3180E-03

(V)

INVL

(µs)

50% 50%

50%

RIN

ROUT

50%

PLH

PHL

Typical Operating Characteristics (continued)

= +5V, T

= +25°C, unless otherwise noted.)

10V

-10V

RIN

ROUT

ENABLE

500ns/div

MAX3180E

ENABLE ASSERTION TO ROUT RESPONSE

MAX3180E-04

= 5.0V

= 50kΩ

= 100pF

Receiver Output Enable

Pin Description

NAME

MAX3180E

FUNCTION

MAX3182E

– Output of the Valid Input Detector

–

2 GND GroundGND

ROUT Inverting Receiver Output–

4 RIN Receiver InputRIN

5 V

Supply VoltageV

Figure 1. Receiver Propagation-Delay Timing

– Noninverting Receiver OutputROUT

MAX3181E MAX3183E

–

INVALID

GND

ROUT

–

RIN

–

INVALID

GND

–

ROUT

RIN

Signal Invalid Detector

If no valid signal levels appear on RIN for 30µs (typ),

INVALID goes low. This event typically occurs if the

RS-232 cable is disconnected, or if the connected

peripheral transmitter is turned off. INVALID goes high

when a valid level is applied to the RS-232 receiver

input. Figure 2 shows the input levels and timing dia-

gram for INVALID operation.

Enable Input

The MAX3180E/MAX3182E feature an enable input

(EN). Drive EN high to force ROUT into a high-imped-

ance state. In this state, the devices ignore incoming

RS-232 signals. Pull EN low for normal operation.

ESD Protection

As with all Maxim devices, ESD protection structures

are incorporated on all pins to protect against ESD

encountered during handling and assembly. The

receiver inputs of the MAX3180E–MAX3183E have extra

protection against static electricity. Maxim’s engineers

have developed state-of-the-art structures enabling

these pins to withstand ESD up to ±15kV without dam-

age or latchup. The receiver inputs of the MAX3180E–

MAX3183E are characterized for protection to the fol-

lowing limits:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge method specified

in IEC 1000-4-2

• ±15kV using the Air-Gap Discharge method speci-

fied in IEC 1000-4-2

Human Body Model

Figure 3 shows the Human Body Model, and Figure 4

shows the current waveform it generates when dis-

charged into a low impedance. This model consists of

a 100pF capacitor charged to the ESD voltage of inter-

est, and then discharged into the test device through a

1.5kΩ resistor.

MAX3180E–MAX3183E

±15kV ESD-Protected, 0.5µA, +3V to +5.5V,

1.5Mbps RS-232 Receivers in SOT23-5

_______________________________________________________________________________________ 5

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

100pF

1MΩ

1500Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 3. Human Body ESD Test Model

100%

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

10%

AMPERES

Figure 4. Human Body Model Current Waveform

VALID SIGNALS

INVALID SIGNALS

VALID SIGNALS

RECEIVER INPUT LEVELS

-2.7V

-0.3V

+2.7V

+0.3V

INDETERMINATE

INVL

INVALID

REGION

RECEIVER

INPUT

VOLTAGE

(V)

INVALID

OUTPUT

(V)

INVH

Figure 2. Input Levels and INVALID Timing

MAX3180E–MAX3183E

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and

performance of finished equipment; it does not specifi-

cally refer to ICs. The MAX3180E–MAX3183E enable the

design of equipment that meets the highest level (Level

4) of IEC 1000-4-2 without the need for additional ESD-

protection components.

The major difference between tests done using the

Human Body Model and IEC 1000-4-2 is higher peak

current in IEC 1000-4-2. Because series resistance is

lower in the IEC 1000-4-2 model, the ESD withstand

voltage measured to this standard is generally lower

than that measured using the Human Body. Figure 5

shows the IEC 1000-4-2 model, and Figure 6 shows the

current waveform for the ±8kV IEC 1000-4-2 Level 4

ESD Contact Discharge test.

The Air-Gap test involves approaching the device with

a charged probe. The Contact Discharge method con-

nects the probe to the device before the probe is ener-

gized.

Power-Supply Decoupling

In most circumstances, a 0.1µF V

bypass capacitor

is adequate. Connect the bypass capacitor as close to

the IC as possible.

±15kV ESD-Protected, 0.5µA, +3V to +5.5V,

1.5Mbps RS-232 Receivers in SOT23-5

6 _______________________________________________________________________________________

CHARGE-CURRENT

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

150pF

50MΩ TO 100MΩ

330Ω

HIGH-

VOLTAGE

SOURCE

DEVICE

UNDER

TEST

Figure 5. IEC 1000-4-2 ESD Test Model

= 0.7ns TO 1ns

30ns

60ns

100%

90%

10%

PEAK

Figure 6. IEC 1000-4-2 ESD Generator Current Waveform

P1-P3 P4-P6 P7-P8

MAX3180EEUK+T

Mfr. #:

Buy MAX3180EEUK+T

Manufacturer:

Maxim Integrated

Description:

RS-232 Interface IC .5uA 3-5.5V 1.5Mbps RS-232 Rcvr

Lifecycle:

New from this manufacturer.

Delivery:

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MAX3180EEUK+T

MAX3180EEUK+T

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