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ISL83384E Datasheet(PDF) 4 Page - Intersil Corporation

Part No. ISL83384E
Description  ±15kV ESD Protected, 3V to 5.5V, 1 Microamp, 250Kbps, RS-232 Transmitter/Receiver
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL83384E Datasheet(HTML) 4 Page - Intersil Corporation

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Detailed Description
The ISL83384E operates from a single +3V to +5.5V supply,
guarantees a 250Kbps minimum data rate, requires only four
small external 0.1
µF 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 ISL83384E 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
µF capacitors for the
voltage doubler and inverter functions over the full VCC
range. 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
Ω and 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL = 3kΩ, and CL = 250pF, one
transmitter easily operates at 900Kbps.
Transmitter inputs float if left unconnected (there are no pull-
up resistors), and may cause ICC increases. Connect
unused inputs to GND for the best performance.
Receivers
The ISL83384E contains standard inverting receivers that
three-state via the SHDN control line. Receivers driving
powered down peripherals must be disabled to prevent
current flow through the peripheral’s protection diodes (see
Figures 2 and 3).
Transmitter Propagation Delay
Transmitter Input to
Transmitter Output,
CL = 1000pF
tPHL
Full
-
0.6
3.5
µs
tPLH
Full
-
0.7
3.5
µs
Receiver Propagation Delay
Receiver Input to Receiver
Output, CL = 150pF
tPHL
Full
-
0.2
1
µs
tPLH
Full
-
0.3
1
µs
Transmitter Output Enable Time
From SHDN Rising Edge to TOUT = ±3V
25
-
50
-
µs
Transmitter Output Disable Time
From SHDN Falling Edge to TOUT = ±5V
25
-
600
-
ns
Transmitter Skew
tPHL - tPLH (Note 4)
25
-
100
-
ns
Receiver Skew
tPHL - tPLH
25
-
100
-
ns
Transition Region Slew Rate
RL = 3kΩ to 7kΩ,
Measured From 3V to -3V or
-3V to 3V
VCC = 3.3V, CL = 150pF to
2500pF
25
4
-
-
V/
µs
VCC = 4.5V, CL = 150pF to
2500pF
25
6
-
-
V/
µs
ESD PERFORMANCE
RS-232 Pins (TOUT, RIN)
Human Body Model
25
-
±15
-
kV
IEC61000-4-2 Contact Discharge
25
-
±8-
kV
IEC61000-4-2 Air Gap Discharge
25
-
±15
-
kV
All Other Pins
Human Body Model
25
-
±3-
kV
NOTE:
4. Transmitter skew is measured at the transmitter zero crossing points.
Electrical Specifications
Test Conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; Unless Otherwise Specified.
Typicals are at TA = 25
oC (Continued)
PARAMETER
TEST CONDITIONS
TEMP
(oC)
MIN
TYP
MAX
UNITS
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
SHDN
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
MODE OF OPERATION
H
Active
Active
Normal Operation
L
High-Z
High-Z
Manual Powerdown
ISL83384E


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