Intersil Corporation ICL3244 Datasheet

TM

ICL3244

Data Sheet June 2000

1Microamp, +3V to +5.5V, 250kbps,
RS-232 Transceiver with Enhanced
Automatic Powerdown

The Intersil ICL32XX devices are 3.0V to 5.5V powered
RS-232 transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at V

= 3.0V. Targeted

CC

applications are PDAs, Palmtops, and notebook and laptop
computers where the low operational, and even lower
standby, power consumption is critical. Efficient on-chip
charge pumps, coupled with manual and enhanced
automatic powerdown functions, reduce the standby supply
current to a 1µA trickle. Small footprint packaging, and the
use of small, low value capacitors ensure board space
savings as well. Data rates greater than 250kbps are
guaranteed at worst case load conditions. This family is fully
compatible with 3.3V only systems, mixed 3.3V and 5.0V
systems, and 5.0V only systems.

The ICL3244 is a 3 driver, 5 receiver device that provides a
complete serial port suitable for laptop or notebook
computers. It also includes a noninverting always-active
receiver for “wake-up” capability.

This device, features an enhanced automatic powerdown
function which powers down the on-chip power-supply and
driver circuits. This occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30s. The
ICL3244 powers back up, automatically, whenever it senses
a transition on any transmitter or receiver input.

Table 1 summarizes the features of the device represented
by this data sheet, while Application Note AN9863
summarizes the features of each device comprising the
ICL3244 3V family.

Ordering Information

TEMP.

PART NO.

ICL3244CA 0 to 70 28 Ld SSOP M28.209
ICL3244CB 0 to 70 28 Ld SOIC M28.3

NOTE: Most surface mount devices are available on tape and reel;
add “-T” to suffix.

RANGE (oC) PACKAGE PKG. NO.

File Number 4876

Features

• Manual and Enhanced Automatic Powerdown Features

• Drop in Replacement for MAX3244

• Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V

• Latch-Up Free

• On-Chip Voltage Converters Require Only Four External

0.1µF Capacitors

• Guaranteed Mouse Driveability

• Receiver Hysteresis For Improved Noise Immunity

• Guaranteed Minimum Data Rate . . . . . . . . . . . . 250kbps

• Guaranteed Minimum Slew Rate . . . . . . . . . . . . . . . 6V/µs

• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V

• Low Supply Current in Powerdown State. . . . . . . . . . 1µA

Applications

• Any System Requiring RS-232 Communication Ports

- Battery Powered, Hand-Held, and Portable Equipment

- Laptop Computers, Notebooks, Palmtops

- Modems, Printers and other Peripherals

- Cellular/Mobile Phones

• Related Literature

- Application Note AN9863, “3V to +5.5V, 250k-1Mbps,
RS-232 Transmitters/Receivers”

Pinout

ICL3244 (SOIC, SSOP)

TOP VIEW

28

C1+
V+

27
26

V

CC

GND

25
24

C1-

23

FORCEON
FORCEOFF

22

INVALID

21
20

R2
R1

19

R2

18

R3

17
16

R4
R5

15

OUTB
OUT
OUT
OUT
OUT
OUT

T1
T2
T3

C2+

R1
R2
R3
R4
R5

OUT
OUT
OUT

T3
T2
T1

C2-

V-

1
2
3
4

IN

5

IN

6

IN

7

IN

8

IN

9
10
11
12

IN

13

IN

14

IN

TABLE 1. SUMMARY OF FEATURES

ENHANCED

PART

NUMBER

NO.OF

Tx.

NO.OF

Rx.

NO. OF

MONITOR Rx.

(R

)

OUTB

DATA
RATE

(kbps)

Rx. ENABLE

FUNCTION?

READY

OUTPUT?

MANUAL

POWER-

DOWN?

AUTOMATIC

POWERDOWN

FUNCTION?

ICL3244 3 5 1 250 No No Yes Yes

4-1

1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

ICL3244

Pin Descriptions

PIN FUNCTION

V

CC

System Power Supply Input (3.0V to 5.5V).
V+ Internally Generated Positive Transmitter Supply (+5.5V).
V- Internally Generated Negative Transmitter Supply (-5.5V).

GND Ground Connection.

C1+ External Capacitor (Voltage Doubler) is connected to this lead.

C1- External Capacitor (Voltage Doubler) is connected to this lead.

C2+ External Capacitor (Voltage Inverter) is connected to this lead.

C2- External Capacitor (Voltage Inverter) is connected to this lead.

T

R

R

T

OUT

R

OUT

OUTB

TTL/CMOS Compatible Transmitter Inputs.

IN

RS-232 Level (Nominally ±5.5V) Transmitter Outputs.

RS-232 Compatible Receiver Inputs.

IN

TTL/CMOS Level Receiver Outputs.

TTL/CMOS Level, Noninverting, Always Enabled Receiver Outputs.

INVALID Active Low Output that indicates if no valid RS-232 levels are present on any receiver input.

FORCEOFF Active Low to Shut Down Transmitters and On-Chip Power Supply. This overrides any automatic circuitry and FORCEON (see Tab le 2).

FORCEON Active High Input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).

Typical Operating Circuit

ICL3244

+3.3V

TTL/CMOS

LOGIC LEVELS

+

0.1µF

CONTROL LOGIC

C

1

0.1µF

C

2

0.1µF

T1

T2

T3

R2

OUTB

R1

OUT

R2

OUT

R3

OUT

R4

OUT

R5

OUT

V

CC

TO POWER

28

C1+

+

24

C1-

1

C2+

+

2

C2-

14

IN

13

IN

12 11

IN

20
19

17

23

FORCEON

22

FORCEOFF

21

INVALID

V

ICL3244

R

1

R

2

R

3

R

4

R

5

GND

CC

26

27

C

3

V+

V-

T

1

T

2

T

3

5kΩ

5kΩ

5kΩ

5kΩ

5kΩ

25

+

0.1µF

3

C

4

0.1µF

+

9

T1

OUT

10

T2

T3

4

R1

518

R2

6

R3

716

R4

815

R5

OUT

OUT

IN

IN

IN

IN

IN

RS-232
LEVELS

RS-232
LEVELS

4-2

ICL3244

Absolute Maximum Ratings Thermal Information

VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V

V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V

V- to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V

V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V

Input Voltages

TIN, FORCEOFF, FORCEON. . . . . . . . . . . . . . . . . . . -0.3V to 6V

RIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V

Output Voltages

T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V

OUT

R

, INVALID. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC +0.3V

OUT

Short Circuit Duration

T

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous

OUT

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table

Operating Conditions

Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

1. θJA is measured with the component mounted on an evaluation PC board in free air.

Thermal Resistance (Typical, Note 1) θJA (oC/W)

28 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . 75

28 Ld SSOP Package . . . . . . . . . . . . . . . . . . . . . . . 100

Moisture Sensitivity (see Technical Brief TB363)

All Packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1

Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

(SOIC, SSOP- Lead Tips Only)

Electrical Specifications Test Conditions: V

= 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified.

CC

Typicals are at TA = 25oC

TEMP

PARAMETER TEST CONDITIONS

(oC) MIN TYP MAX UNITS

DC CHARACTERISTICS

Supply Current, Automatic

Open, FORCEON = GND, FORCEOFF = V

All R

IN

CC

25 - 1.0 10 µA

Powerdown
Supply Current, Powerdown
Supply Current,

FORCEOFF = GND 25 - 1.0 10 µA
All Outputs Unloaded, FORCEON =

FORCEOFF = V

CC

25 - 0.3 1.0 mA

Automatic Powerdown Disabled

LOGIC AND TRANSMITTER INPUTS AND RECEIVER OUTPUTS

Input Logic Threshold Low T
Input Logic Threshold High T

Input Leakage Current T
Output Leakage Current
Output Voltage Low I
Output Voltage High I

, FORCEON, FORCEOFF Full - - 0.8 V

IN

, FORCEON, FORCEOFF VCC = 3.3V Full 2.0 - - V

IN

= 5.0V Full 2.4 - - V

V

CC

, FORCEON, FORCEOFF Full - ±0.01 ±1.0 µA

IN

FORCEOFF = GND Full - ±0.05 ±10 µA

= 1.6mA Full - - 0.4 V

OUT

= -1.0mA Full VCC-0.6 VCC-0.1 - V

OUT

RECEIVER INPUTS

Input Voltage Range Full -25 - 25 V
Input Threshold Low V

Input Threshold High V

= 3.3V 25 0.6 1.2 - V

CC

= 5.0V 25 0.8 1.5 - V

V

CC

= 3.3V 25 - 1.5 2.4 V

CC

= 5.0V 25 - 1.8 2.4 V

V

CC

Input Hysteresis 25 - 0.5 - V
Input Resistance 25357kΩ

TRANSMITTER OUTPUTS

Output Voltage Swing All Transmitter Outputs Loaded with 3kΩ to Ground Full ±5.0 ±5.4 - V

4-3

ICL3244

Electrical Specifications Test Conditions: V

= 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified.

CC

Typicals are at TA = 25oC (Continued)

TEMP

PARAMETER TEST CONDITIONS

(oC) MIN TYP MAX UNITS

Output Resistance VCC = V+ = V- = 0V, Transmitter Output = ±2V Full 300 10M - Ω
Output Short-Circuit Current Full - ±35 ±60 mA
Output Leakage Current V

= ±12V, VCC = 0V or 3V to 5.5V,

OUT

Full - - ±25 µA

Automatic Powerdown or FORCEOFF = GND

MOUSE DRIVEABILITY

Transmitter Output Voltage
(Figure 11)

=T2IN= GND, T3IN=VCC,T3

T1

IN

GND, T1

OUT

and T2

OUT

Loaded with 2.5mA Each
ENHANCED AUTOMATIC POWERDOWN (FORCEON = GND,
Receiver Input Thresholds to

ICL3244 Powers Up (Figure 6) Full -2.7 - 2.7 V

FORCEOFF = VCC)

Loaded with 3kΩto

OUT

Full ±5- -V

INVALID High
Receiver Input Thresholds to

ICL3244 Powers Down (Figure 6) Full -0.3 - 0.3 V

INVALID Low
INVALID Output Voltage Low I
INVALID Output Voltage High I
Receiver Positive or Negative

Threshold to
(t

INVH

INVALID High Delay

)

Receiver Positive or Negative
Threshold to
(t

INVL

INVALID Low Delay

)

Receiver or Transmitter Edge to
Transmitters Enabled Delay (t

WU

)

Receiver or Transmitter Edge to

= 1.6mA Full - - 0.4 V

OUT

= -1.0mA Full VCC-0.6 - - V

OUT

25 - 1 - µs

25 - 30 - µs

Note 2 25 - 100 - µs

Note 2 Full 15 30 60 s
Transmitters Enabled Delay
(t

AUTOPWDN

)

TIMING CHARACTERISTICS

Maximum Data Rate RL = 3kΩ, CL= 1000pF, One Transmitter Switching Full 250 500 - kbps
Receiver Propagation Delay Receiver Input to Receiver

Output, C

= 150pF

L

t

PHL

t

PLH

25 - 0.15 - µs

25 - 0.15 - µs
Receiver Output Enable Time Normal Operation 25 - 200 - ns
Receiver Output Disable Time Normal Operation 25 - 200 - ns
Transmitter Skew t
Receiver Skew t
Transition Region Slew Rate V

- t

PHL

PLH

- t

PHL

PLH

= 3.3V,

CC

RL = 3kΩ to 7kΩ,
Measured From 3V to -3V or -3V

CL= 150pF to 1000pF 25 6 - 30 V/µs

= 150pF to 2500pF 25 4 8 30 V/µs

C

L

25 - 100 - ns

25 - 50 - ns

to 3V

ESD PERFORMANCE

RS-232 Pins (T

, RIN) Human Body Model 25 - >±8-kV

OUT

IEC1000-4-2 Contact Discharge 25 - ±8-kV
IEC1000-4-2 Air Gap Discharge 25 - ±8-kV

All Other Pins Human Body Model 25 - ±3-kV

NOTE:

2. An “edge” is defined as a transition through the transmitter or receiver input thresholds.

4-4