ISL83384E Intersil Corporation, ISL83384E Datasheet - Page 4

• Manufacturer Part Number: ISL83384E
• Description: 15kV ESD Protected/ +3V to +5.5V/ 1 Microamp/ 250Kbps/ RS-232 Transmitter/Receiver
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTE:
Detailed Description
The ISL83384E operates from a single +3V to +5.5V supply,
guarantees a 250Kbps minimum data rate, requires only four
small external 0.1µF 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
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 over the full V
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.
Transmitter Propagation Delay
Receiver Propagation Delay
Transmitter Output Enable Time
Transmitter Output Disable Time
Transmitter Skew
Receiver Skew
Transition Region Slew Rate
ESD PERFORMANCE
RS-232 Pins (T
All Other Pins
4. Transmitter skew is measured at the transmitter zero crossing points.
PARAMETER
OUT
, R
IN
)
4
Test Conditions: V
Typicals are at T
Transmitter Input to
Transmitter Output,
C
Receiver Input to Receiver
Output, C
From SHDN Rising Edge to T
From SHDN Falling Edge to T
t
t
R
Measured From 3V to -3V or
-3V to 3V
Human Body Model
IEC61000-4-2 Contact Discharge
IEC61000-4-2 Air Gap Discharge
Human Body Model
PHL
PHL
L
L
= 1000pF
= 3kΩ to 7kΩ,
- t
- t
PLH
PLH
L
= 150pF
(Note 4)
CC
A
CC
= 25
supply as
TEST CONDITIONS
= 3V to 5.5V, C
CC
o
C (Continued)
ISL83384E
t
t
t
t
V
2500pF
V
2500pF
OUT
OUT
PHL
PLH
PHL
PLH
CC
CC
= ±3V
= 3.3V, C
= 4.5V, C
= ±5V
1
- C
4
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 (3kΩ and 1000pF), V
transmitter operating at full speed. Under more typical
conditions of V
transmitter easily operates at 900Kbps.
Transmitter inputs float if left unconnected (there are no pull-
up resistors), and may cause I
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).
TABLE 2. POWERDOWN AND ENABLE LOGIC TRUTH TABLE
INPUT
= 0.1µF; Unless Otherwise Specified.
SHDN
L
L
H
L
= 150pF to
= 150pF to
TRANSMITTER
OUTPUTS
High-Z
Active
CC
TEMP
(
≥ 3.3V, R
Full
Full
Full
Full
o
25
25
25
25
25
25
25
25
25
25
C)
RECEIVER
OUTPUTS
MIN
High-Z
L
Active
4
6
-
-
-
-
-
-
-
-
-
-
-
-
= 3kΩ, and C
CC
CC
increases. Connect
≥ 3.0V, with one
TYP
600
100
100
±15
±15
0.6
0.7
0.2
0.3
Normal Operation
Manual Powerdown
50
±8
±3
MODE OF OPERATION
-
-
L
= 250pF, one
MAX
3.5
3.5
1
1
-
-
-
-
-
-
-
-
-
-
UNITS
V/µs
V/µs
µs
µs
µs
µs
µs
kV
kV
kV
kV
ns
ns
ns