intersil ISL4270E DATA SHEET
®
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ISL4270E
Data Sheet August 2004
QFN Packaged, +/-15kV ESD Protected,
+3V to +5.5V, 300nA, 250kbps, RS-232
Transceivers with Enhanced Automatic
Powerdown and a Separate Logic Supply
The Intersil ISL4270E is a 3.0V to 5.5V powered RS-232
transceiver which meets ElA/TIA-232 and V.28/V.24
specifications, even at V
±15kV ESD protection (IEC61000-4-2 Air Gap and Human
Body Model) on transmitter outputs and receiver inputs
(RS-232 pins). Targeted 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 300nA trickle. Tiny 5mm x 5mm
Quad Flat No-Lead (QFN) 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.
The ISL4270E features a V
output levels and input thresholds to values compatible with
the V
powering the external logic (e.g., a UART).
CC
This device includes 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 30 seconds.
It power back up, automatically, whenever it senses a
transition on any transmitter or receiver input.
Table 1 summarizes the features of the ISL4270E, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
= 3.0V. Additionally, it provides
CC
pin that adjusts the logic pin
L
FN6041.1
Features
• Available in Near Chip Scale QFN (5mmx5mm) Package
•V
Supply Pin for Compatibility with Mixed Voltage
L
Systems
• ESD Protection for RS-232 I/O Pins to
±15kV (IEC61000)
• Manual and Enhanced Automatic Powerdown Features
• Meets EIA/TIA-232 and V.28/V.2 4 Specifications at 3V
• On-Chip Charge Pumps Require Only Four External
0.1µF Capacitors
• Receivers Stay Active in Powerdown
• Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 300µA
• Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
• Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
• Low Supply Current in Powerdown State. . . . . . . . 300nA
• Pb-Free Available (RoHS Compliant)
Applications
• Any System Requiring RS-232 Communication Ports
- Battery Powered, Hand-Held, and Portable Equipment
- Laptop Computers, Notebooks, Palmtops
- Digital Cameras
- PDA’s and PDA Cradles
- Cellular/Mobile Phones
Ordering Information
TEMP.
PART NO.
ISL4270EIR -40 to 85 32 Ld QFN L32.5x5
ISL4270EIRZ
(See Note)
*Add “-T” suffix to part number for tape and reel packaging.
RANGE (oC) PACKAGE
-40 to 85 32 Ld QFN
(Pb-free)
PKG. DWG.
#
L32.5x5
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD020C.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL4270E 3 3 250 NO YES YES YES
NO. OF
Tx.
NO. OF
Rx.
1
DATA RATE
(kbps)
Rx. ENABLE
FUNCTION?
1-888-INTERSIL or 321-724-7143
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
LOGIC
V
L
SUPPLY PIN?
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
MANUAL
POWER- DOWN?
Copyright © Intersil Americas Inc. 2003, 2004. All Rights Reserved
ENHANCED AUTOMATIC
POWERDOWN FUNCTION?
Pinout
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ISL4270E
ISL4270E (QFN)
TOP VIEW
FORCEOFF
CC
V
GND
NC
2728293031 252632
NC
24
T1
OUT
23
T2
OUT
22
T3
OUT
21
R1
IN
20
R2
IN
19
R3
IN
18
NC
17
16
L
V
OUT
R1
NC
NC
C2+
C2-
T1
T2
INVALID
NC
C1-
V+
NC
1
2
3
V-
4
5
IN
6
IN
7
8
IN
NC
T3
C1+
11 12 13 14 159 10
OUTR2OUT
R3
FORCEON
Pin Descriptions
PIN FUNCTION
V
CC
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
T
OUT
R
R
OUT
V
INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input. Swings between GND and VL.
FORCEOFF
FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active (FORCEOFF
System power supply input (3.0V to 5.5V).
TTL/CMOS compatible transmit ter I nput s . The switching point is a function of the VL voltage.
IN
±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs.
±15kV ESD Protected, RS-232 compatible receiver in puts.
IN
TTL/CMOS level receiver outputs. Swings between GND and VL.
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply.
L
Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
The switching point is a function of the V
voltage.
L
must be high). The
switching point is a function of the V
voltage.
L
2
Typical Operating Circuit
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ISL4270E
TTL/CMOS
LOGIC LEVELS
+3.3V
0.1µF
0.1µF
R1
R2
R3
C
C
T1
T2
T3
OUT
OUT
OUT
+
0.1µF
29
1
2
IN
IN
IN
C1+
+
31
C1-
2
C2+
+
3
C2-
5
6
10
14
13
12
27
V
CC
T
1
T
2
T
3
R
1
R
2
R
3
V+
V-
5kΩ
5kΩ
5kΩ
30
C
3
+
0.1µF
4
C
4
0.1µF
+
23
T1
OUT
22
T2
21
T3
20
R1
19
R2
18
R3
OUT
OUT
IN
IN
IN
RS-232
LEVELS
RS-232
LEVELS
LOGIC V
CC
0.1µF
TO POWER
CONTROL LOGIC
V
15
11
28
7
L
FORCEON
FORCEOFF
INVALID
GND
26
+
V
CC
3
ISL4270E
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Absolute Maximum Ratings Thermal Information
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
L
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
, FORCEON, FORCEOFF . . . . . . . . . . . . . . . . . . -0.3V to 6V
T
IN
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25V
IN
Output Voltages
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±13.2V
T
OUT
R
, INVALID. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VL +0.3V)
OUT
Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
T
OUT
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
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.
NOTES:
1. θ
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JA
Tech Brief TB379, and Tech Brief TB389.
Thermal Resistance (Typical, Note 1)
32 Ld QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . 32
Moisture Sensitivity (see Technical Brief TB363)
QFN Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
Maximum Storage Temperature Range. . . . . . . . . . -65
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
θ
(oC/W)
JA
o
C to 150oC
Operating Conditions
Temperature Range
ISL4270EIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85oC
o
o
C
C
Electrical Specifications Test Conditions: V
Typicals are at T
PARAMETER TEST CONDITIONS
DC CHARACTERISTICS
Supply Current, Automatic
Powerdown
Supply Current, Powerdown FORCEOFF
Supply Current,
Automatic Powerdown Disabled
LOGIC AND TRANSMITTER INPUTS
Input Logic Threshold Low T
Input Logic Threshold High T
Transmitter Input Hysteresis 25 - 0.5 - V
Input Leakage Current T
RECEIVER OUTPUTS
Output Voltage Low I
Output Voltage High I
RECEIVER INPUTS
Input Voltage Range Full -25 - 25 V
Input Threshold Low V
Input Threshold High V
Input Hysteresis 25 - 0.5 - V
Input Resistance 25357kΩ
All R
Open, FORCEON = GND, FORCEOFF =V
IN
All Outputs Unloaded, FORCEON = FORCEOFF
= 3.15V
V
CC
, FORCEON, FORCEOFF VL = 3.3V or 5V Full - - 0.8 V
IN
, FORCEON, FORCEOFF VL = 5V Full 2.4 - - V
IN
, FORCEON, FORCEOFF Full - ±0.01 ±1.0 µA
IN
= 1.6mA Full - - 0.4 V
OUT
= -1.0mA Full VL - 0.6 VL - 0.1 - V
OUT
= VL = 5.0V 25 0.8 1.5 - V
CC
V
= VL = 3.3V 25 0.6 1.2 - V
CC
= VL = 5.0V 25 - 1.8 2.4 V
CC
= VL = 3.3V 25 - 1.5 2.4 V
V
CC
= 3V to 5.5V, C1 - C4 = 0.1µF, VL = VCC; Unless Otherwise Specified.
CC
= 25oC, VCC = VL = 3.3V
A
TEMP
o
C) MIN TYP MAX UNITS
(
CC
=GND 25 - 0.3 5 µA
=VCC,
V
= 2.5V Full - - 0.6 V
L
V
= 3.3V Full 2.0 - - V
L
V
= 2.5V Full 1.4 - - V
L
V
= 1.8V 25 - 0.9 - V
L
25 - 0.3 5 µA
25 - 0.3 1 mA
4
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