CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379, and Tech Brief TB389.
2. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
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
TEST CONDITIONS
TEMP
(
o
C)
MIN
(Note 4)
TYP
MAX
(Note 4)
UNITS
PARAMETER
DC CHARACTERISTICS
Supply Current, Powerdown
Supply Current
SHDN = GND, All Inputs at V
CC
or GND
All Outputs Unloaded, SHDN = V
CC
, V
CC
= 3.15V
25
25
-
-
0.15
0.3
1
1
A
mA
LOGIC AND TRANSMITTER INPUTS
Input Logic Threshold Low
T
IN
, SHDN
V
L
= 3.3V or 5V
V
L
= 2.5V
Input Logic Threshold High
T
IN
, SHDN
V
L
= 5V
V
L
= 3.3V
V
L
= 2.5V
V
L
= 1.8V
Transmitter Input Hysteresis
Input Leakage Current
RECEIVER OUTPUTS
Output Leakage Current
Output Voltage Low
Output Voltage High
RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
V
L
= 5.0V
V
L
= 3.3V
Input Threshold High
V
L
= 5.0V
V
L
= 3.3V
Input Hysteresis
Full
25
25
25
25
25
-25
0.8
0.6
-
-
-
-
1.5
1.2
1.8
1.5
0.5
25
-
-
2.4
2.4
-
V
V
V
V
V
V
V
CC
= 0V or 3V to 5.5V, SHDN = GND
I
OUT
= 1.6mA
I
OUT
= -1.0mA
Full
Full
Full
-
-
V
L
- 0.6
0.05
-
V
L
- 0.1
10
0.4
-
A
V
V
T
IN
, SHDN
Full
Full
Full
Full
Full
25
25
Full
-
-
2.4
2.0
1.4
-
-
-
-
-
-
-
-
0.9
0.5
0.01
0.8
0.6
-
-
-
-
-
1
V
V
V
V
V
V
V
A
FN6035 Rev 2.00
June 21, 2010
Page 4 of 11
ISL4260E
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)
TEST CONDITIONS
TEMP
(
o
C)
25
MIN
(Note 4)
3
TYP
5
MAX
(Note 4)
UNITS
7
k
PARAMETER
Input Resistance
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
All Transmitter Outputs Loaded with 3k to Ground
V
CC
= V+ = V- = 0V, Transmitter Output =
2V
Shorted to GND
V
OUT
=
12V,
V
CC
= 0V or 3V to 5.5V, SHDN = GND
Full
Full
Full
Full
5.0
300
-
-
5.4
10M
-
-
-
-
60
25
V
mA
A
R
L
= 3kC
L
= 1000pF, One Transmitter Switching
Receiver Input to Receiver
Output, C
L
= 150pF
t
PHL
t
PLH
Full
25
25
25
25
250
-
-
-
-
-
-
-
6
4
500
0.15
0.15
200
200
100
100
50
18
13
-
-
-
-
-
-
-
-
30
30
kbps
s
s
ns
ns
s
ns
ns
V/s
V/s
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Output Enable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
From SHDN Rising Edge to T
OUT
=
3.7V
t
PHL
- t
PLH
(Note 3)
t
PHL
- t
PLH
C
L
= 150pF to 1000pF
R
L
= 3kto 7k
Measured From 3V to -3V or
C
L
= 150pF to 2500pF
-3V to 3V, V
CC
= 3.3V
25
25
25
25
25
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
Human Body Model
IEC61000-4-2 Air Gap Discharge
IEC61000-4-2 Contact Discharge
NOTE:
3. Transmitter skew is measured at the transmitter zero crossing points.
4. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
25
25
25
-
-
-
15
15
8
-
-
-
kV
kV
kV
Detailed Description
The ISL4260E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1F 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.
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
Charge-Pump
Intersil’s new ISL4260E 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 0.1F 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
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