ISL4244EIRZ Intersil, ISL4244EIRZ Datasheet - Page 8

• Manufacturer Part Number: ISL4244EIRZ
• Description: IC TXRX RS232 2.7-5.5V 32QFN
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of ISL4244EIRZ

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Specifications
NOTES:
Receiver Output Disable Time
Transmitter Output Enable Time
ISL4238E/ISL4244E/ISL4245E
Transmitter Output Disable Time
ISL4238E/ISL4244E/ISL4245E
Transition Region Slew Rate
ISL4238E/ISL4244E
Transition Region Slew Rate
ISL4245E
ESD PERFORMANCE
RS-232 Pins (T
All Other Pins
Detailed Description
These interface ICs operate from a single +2.7V to +5.5V
supply, guarantee a 250kbps (ISL4238E/ISL4244E)/1Mbps
(ISL4245E) minimum data rate, require only four small
external 0.1µF capacitors, feature low power consumption,
and meet 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 RS-232 family utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate ±5.5V transmitter supplies from a V
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 0.1µF capacitors for the
voltage doubler and inverter functions. 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.
3. ISL4238E inputs utilize a positive feedback resistor. The input current is negligible when the input is at either supply rail.
4. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
5. Skew is measured at the receiver input switching points (1.4V).
6. Skew is measured at the transmitter zero crossing points.
7. 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.
PARAMETER
OUT
, R
IN
)
8
Test Conditions: ISL4238E V
ISL424xE V
Normal Operation, R
Normal Operation, R
Normal Operation, R
V
R
Measured From 3V to -3V
or -3V to 3V
V
-3V or -3V to 3V, C
Human Body Model
IEC61000-4-2 Air Gap Discharge
IEC61000-4-2 Contact Discharge
Human Body Model
CC
CC
L
= 3kΩ to 7kΩ,
= 3V to 3.6V, R
= 3V to 3.6V,
CC
ISL4238E, ISL4244E, ISL4245E
= 3V to 5.5V, C
CC
supply as
L
TEST CONDITIONS
L
= 150pF to 1000pF
L
L
L
= 3kΩ to 7kΩ, Measured From 3V to
= 1kΩ to 0.5V
= 3kΩ, C
= 3kΩ, C
CC
C
C
1
L
L
= 3.15V to 5.5V, C
to C
L
L
= 150pF to 1000pF
= 150pF to 2500pF
= 1000pF
= 1000pF
4
CC
= 0.1µF; Unless Otherwise Specified. Typicals are at T
, C
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.
Transmitter outputs disable and assume a high impedance
state when the device enters the power-down mode (see Table
2). These outputs may be driven to ±12V when disabled.
The ISL4238E/ISL4244E guarantee a 250kbps data rate for
full load conditions (3kΩ and 1000pF), V
transmitter operating at full speed. Under more typical
conditions of V
transmitter easily operates at 1Mbps.
The ISL4245E guarantees a 1Mbps data rate for full load
conditions (3kΩ and 250pF), V
transmitter operating at full speed. Under more typical
conditions of V
transmitter easily operates at 1.4Mbps.
Transmitter inputs on the ISL424XE float if left unconnected,
and may cause I
L
= 15pF
1
to C
4
= 0.1µF; V
CC
CC
CC
TEMP
(°C)
Full
Full
Full
Full
Full
Full
25
25
25
25
25
25
25
25
25
25
≥ 3.3V, R
≥ 3.3V, R
increases. Connect unused inputs to
CC
(Note 7)
= 3V, C
MIN
L
L
24
24
6
6
4
4
-
-
-
-
-
-
-
-
-
-
= 3kΩ, and C
= 3kΩ, and C
CC
1
to C
≥ 3.0V, with one
TYP
350
400
±15
±15
2.5
2.7
4
25
35
10
40
35
±8
±3
11
9
8
= 0.22µF;
CC
L
L
≥ 3.0V, with one
A
= 250pF, one
= 250pF, one
(Note 7) UNITS
= +25°C
MAX
500
600
150
150
40
50
30
30
30
30
4
4
-
-
-
-
May 13, 2010
FN8038.5
V/µs
V/µs
V/µs
V/µs
V/µs
V/µs
µs
µs
µs
µs
kV
kV
kV
kV
ns
ns