1
FN6034
ISL83386E
15kV ESD Protected, +3V to +5.5V,
1 Microamp, 250kbps, RS-232
Transmitters/Receivers with Separate
Logic Supply
The ISL83386E contains 3.0V to 5.5V powered RS-232
transmitters/receivers which meet ElA/TIA-232 and
V.28/V.24 specifications, even at V
CC
= 3.0V. Targeted
applications are PDAs, Palmtops, and cell phones where the
low operational, and even lower standby, power consumption
is critical. Efficient on-chip charge pumps, coupled with a
manual powerdown function reduces the standby supply
current to a 1
A 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.
The ISL83386E features a V
L
pin that adjusts the logic pin
(see Pin Descriptions table) output levels and input
thresholds to values compatible with the V
CC
powering the
external logic (e.g., a UART).
The single pin powerdown function (SHDN = 0) disables all
the receiver and transmitter outputs, while shutting down the
charge pump to minimize supply current drain.
Table 1 summarizes the features of the ISL83386E, while
Application Note AN9863 summarizes the features of each
device comprising the 3V RS-232 family.
Features
V
L
Pin for Compatibility with Mixed Voltage Systems
ESD Protection for RS-232 I/O Pins to
15kV (IEC61000)
Low Power, Pin Compatible Upgrade for MAX3386E and
SP3203E
Single SHDN Pin Disables Transmitters and Receivers
Meets EIA/TIA-232 and V.28/V.24 Specifications at 3V
On-Chip Charge Pumps Require Only Four External
0.1
F Capacitors
Receiver Hysteresis For Improved Noise Immunity
Very Low Supply Current . . . . . . . . . . . . . . . . . . . . 300
A
Guaranteed Minimum Data Rate . . . . . . . . . . . . . 250kbps
Wide Power Supply Range. . . . . . . . Single +3V to +5.5V
Low Supply Current in Powerdown State . . . . . . . . . < 1
A
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
PART
NUMBER
(BRAND)
TEMP.
RANGE (
o
C)
PACKAGE
PKG. NO.
ISL83386EIV
(83386EIV)
-40 to 85
20 Ld TSSOP
M20.173
ISL83386EIV-T
(83386EIV)
-40 to 85
Tape and Reel
M20.173
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
NO. OF
Tx.
NO. OF
Rx.
DATA RATE
(kbps)
Rx. ENABLE
FUNCTION?
V
L
LOGIC
SUPPLY PIN?
MANUAL
POWER- DOWN?
AUTOMATIC
POWERDOWN FUNCTION?
ISL83386E
3
2
250
NO
YES
YES
NO
Data Sheet
January 2003
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003. All Rights Reserved
2
Pinout
ISL83386E (TSSOP)
TOP VIEW
C1+
V+
C1-
C2+
C2-
V-
T2
IN
T3
IN
SHDN
GND
T1
OUT
T2
OUT
T3
OUT
R2
IN
R1
OUT
V
CC
R1
IN
V
L
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
R2
OUT
T1
IN
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
IN
TTL/CMOS compatible transmitter Inputs. The switching point is a function of the V
L
voltage.
T
OUT
15kV ESD Protected
,
RS-232 level (nominally
5.5V) transmitter outputs.
R
IN
15kV ESD Protected
,
RS-232 compatible receiver inputs.
R
OUT
TTL/CMOS level receiver outputs. Swings between GND and V
L
.
V
L
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply.
SHDN
Active low TTL/CMOS input to tri-state receiver and transmitter outputs and to shut down the on-board power supply to place device
in low power mode. The switching point is a function of the V
L
voltage.
ISL83386E
3
Typical Operating Circuit
19
V
CC
T1
OUT
T2
OUT
T1
IN
T2
IN
T
1
T
2
0.1
F
+
0.1
F
+
0.1
F
7
8
17
16
1
3
2
6
V+
V-
C1+
C1-
C2+
C2-
+
0.1
F
4
5
R1
OUT
R1
IN
14
5k
R2
OUT
R2
IN
13
10
5k
11
C
1
C
2
+ C
3
C
4
SHDN
GND
20
+3.3V to +5V
+
0.1
F
18
V
CC
TTL/CMOS
LOGIC LEVELS
RS-232
LEVELS
R
1
R
2
T3
OUT
T3
IN
T
3
9
15
V
L
12
LOGIC V
CC
+
0.1
F
ISL83386E
4
Absolute Maximum Ratings
Thermal Information
V
CC
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V
L
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V+ to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
V- to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3V to -7V
V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Input Voltages
T
IN
, SHDN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
R
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25V
Output Voltages
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.2V
R
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V
L
+0.3V)
Short Circuit Duration
T
OUT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Resistance (Typical, Note 1)
JA
(
o
C/W)
20 Ld TSSOP Package . . . . . . . . . . . . . . . . . . . . . .
140
Moisture Sensitivity (see Technical Brief TB363)
TSSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Level 1
Maximum Junction Temperature (Plastic Package) . . . . . . . 150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300
o
C
(Lead Tips Only)
Operating Conditions
Temperature Range
ISL83386EIV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to 85
o
C
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.
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
F, V
L
= V
CC
; Unless Otherwise Specified.
Typicals are at T
A
= 25
o
C, V
CC
= V
L
= 3.3V
PARAMETER
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS
Supply Current, Powerdown
SHDN = GND, All Inputs at V
CC
or GND
25
-
1
10
A
Supply Current
All Outputs Unloaded, SHDN = V
CC
, V
CC
= 3.15V
25
-
0.3
1
mA
LOGIC AND TRANSMITTER INPUTS
Input Logic Threshold Low
T
IN
, SHDN
V
L
= 3.3V or 5V
Full
-
-
0.8
V
V
L
= 2.5V
Full
-
-
0.6
V
Input Logic Threshold High
T
IN
, SHDN
V
L
= 5V
Full
2.4
-
-
V
V
L
= 3.3V
Full
2.0
-
-
V
V
L
= 2.5V
Full
1.4
-
-
V
V
L
= 1.8V
25
-
0.9
-
V
Transmitter Input Hysteresis
25
-
0.5
-
V
Input Leakage Current
T
IN
, SHDN
Full
-
0.01
1
A
RECEIVER OUTPUTS
Output Leakage Current
V
CC
= 0V or 3V to 5.5V, SHDN = GND
Full
-
0.05
10
A
Output Voltage Low
I
OUT
= 1.6mA
Full
-
-
0.4
V
Output Voltage High
I
OUT
= -1.0mA
Full
V
L
- 0.6
V
L
- 0.1
-
V
RECEIVER INPUTS
Input Voltage Range
Full
-25
-
25
V
Input Threshold Low
V
L
= 5.0V
25
0.8
1.5
-
V
V
L
= 3.3V
25
0.6
1.2
-
V
Input Threshold High
V
L
= 5.0V
25
-
1.8
2.4
V
V
L
= 3.3V
25
-
1.5
2.4
V
Input Hysteresis
25
-
0.5
-
V
Input Resistance
25
3
5
7
k
ISL83386E
5
Detailed Description
The ISL83386E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1
F capacitors, features low power
consumption, and meets all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil's new ISL83386E utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate
5.5V transmitter supplies from a V
CC
supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the
10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1
F capacitors for the
voltage doubler and inverter functions over the full V
CC
range; other capacitor combinations can be used as shown
in Table 3. The charge pumps operate discontinuously (i.e.,
they turn off as soon as the V+ and V- supplies are pumped
up to the nominal values), resulting in significant power
savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
5.5V supplies, these
transmitters deliver true RS-232 levels over a wide range of
single supply system voltages.
All transmitter outputs disable and assume a high
impedance state when the device enters the powerdown
mode (see Table 2). These outputs may be driven to
12V
when disabled.
All devices guarantee a 250kbps data rate for full load
conditions (3k
and 1000pF), V
CC
3.0V, with one
transmitter operating at full speed. Under more typical
conditions of V
CC
3.3V, R
L
= 3k
, and C
L
= 250pF, one
transmitter easily operates at 1.25Mbps.
The transmitter input threshold is set by the voltage applied
to the V
L
pin. Transmitter inputs float if left unconnected
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3k
to Ground
Full
5.0
5.4
-
V
Output Resistance
V
CC
= V+ = V- = 0V, Transmitter Output =
2V
Full
300
10M
-
Output Short-Circuit Current
Shorted to GND
Full
-
-
60
mA
Output Leakage Current
V
OUT
=
12V, V
CC
= 0V or 3V to 5.5V, SHDN = GND
Full
-
-
25
A
TIMING CHARACTERISTICS
Maximum Data Rate
R
L
= 3k
,
C
L
= 1000pF, One Transmitter Switching
Full
250
500
-
kbps
Receiver Propagation Delay
Receiver Input to Receiver
Output, C
L
= 150pF
t
PHL
25
-
0.15
-
s
t
PLH
25
-
0.15
-
s
Receiver Output Enable Time
25
-
200
-
ns
Receiver Output Disable Time
25
-
200
-
ns
Transmitter Output Enable Time
From SHDN Rising Edge to T
OUT
=
3.7V
25
-
100
-
s
Transmitter Skew
t
PHL
- t
PLH
(Note 2)
25
-
100
-
ns
Receiver Skew
t
PHL
- t
PLH
25
-
50
-
ns
Transition Region Slew Rate
R
L
= 3k
to 7k
,
Measured From 3V to -3V or
-3V to 3V, V
CC
= 3.3V
C
L
= 150pF to 1000pF
25
6
18
30
V/
s
C
L
= 150pF to 2500pF
25
4
13
30
V/
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
Human Body Model
25
-
15
-
kV
IEC61000-4-2 Air Gap Discharge
25
-
15
-
kV
IEC61000-4-2 Contact Discharge
25
-
8
-
kV
NOTE:
2. Transmitter skew is measured at the transmitter zero crossing points.
Electrical Specifications
Test Conditions: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
F, V
L
= V
CC
; Unless Otherwise Specified.
Typicals are at T
A
= 25
o
C, V
CC
= V
L
= 3.3V (Continued)
PARAMETER
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
ISL83386E
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