ISL83387EIV datasheet(7/13 Pages) INTERSIL

Part #	ISL83387EIV

Description	/-15kV ESD Protected, 3V to 5.5V, 1Microamp, 250kbps, RS-232 Transceivers with Enhanced Automatic Powerdown and a Separate Logic Supply

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Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

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7 / 13 page

7

FN6040.1

July 8, 2005

mode an RC time constant after this rising edge. The time

constant isn’t critical, because the ISL83387E remains

powered up for 30 seconds after the FORCEON falling edge,

even if there are no signal transitions. This gives slow-to-

wake systems (e.g., a mouse) plenty of time to start

transmitting, and as long as it starts transmitting within 30

seconds both systems remain enabled.

VL Logic Supply Input

Unlike other RS-232 interface devices where the CMOS

outputs swing between 0 and VCC, the ISL83387E features

a separate logic supply input (VL; 1.8V to 5V, regardless of

VCC) that sets VOH for the receiver and INVALID outputs.

Connecting VL to a host logic supply lower than VCC,

prevents the ISL83387E outputs from forward biasing the

input diodes of a logic device powered by that lower supply.

Connecting VL to a logic supply greater than VCC ensures

that the receiver and INVALID output levels are compatible

even with the CMOS input VIH of AC, HC, and CD4000

devices. Note that the VL supply current increases to 100µA

with VL = 5V and VCC = 3.3V (see Figure 16). VL also

powers the transmitter and logic inputs, thereby setting their

switching thresholds to levels compatible with the logic

supply. This separate logic supply pin allows a great deal of

flexibility in interfacing to systems with different logic

supplies. If logic translation isn’t required, connect VL to the

ISL83387E VCC.

INVALID Output

The INVALID output always indicates (see Table 2) whether

or not 30

µs have elapsed with invalid RS-232 signals (see

TABLE 2. POWERDOWN LOGIC TRUTH TABLE

RCVR OR XMTR

EDGE WITHIN 30

SEC?

FORCEOFF

INPUT

FORCEON

INPUT

TRANSMITTER

OUTPUTS

RECEIVER

OUTPUTS

RS-232 LEVEL

PRESENT AT

RECEIVER INPUT?

INVALID

OUTPUT

MODE OF OPERATION

NO

H

Active

NO

L

Normal Operation (Enhanced

Auto Powerdown Disabled)

NO

H

Active

YES

H

YES

H

L

Active

NO

L

Normal Operation (Enhanced

Auto Powerdown Enabled)

YES

H

L

Active

YES

H

NO

H

L

High-Z

Active

NO

L

Powerdown Due to Enhanced

Auto Powerdown Logic

NO

H

L

High-Z

Active

YES

H

X

L

X

High-Z

Active

NO

L

Manual Powerdown

X

L

X

High-Z

Active

YES

H

INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN)

X

NOTE 3

Active

YES

H

Normal Operation

X

NOTE 3

High-Z

Active

NO

L

Forced Auto Powerdown

NOTES:

3. Input is connected to INVALID Output.

FIGURE 2. CONNECTIONS FOR MANUAL POWERDOWN

PWR

FORCEOFF, FORCEON

CPU

I/O

ISL83387E

MGT

LOGIC

UART

VL

I/O CHIP

POWER SUPPLY

VCC

INVALID

FIGURE 3. CIRCUIT TO ENSURE IMMEDIATE POWER UP

WHEN EXITING FORCED POWERDOWN

FORCEOFF

FORCEON

POWER

MASTER POWERDOWN LINE

1M

Ω

0.1

µF

MANAGEMENT

UNIT

ISL83387E

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