參數(shù)資料
型號： ISL83384ECA-T
廠商： INTERSIL CORP
元件分類： 通用總線功能
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： DUAL LINE TRANSCEIVER, PDSO20
封裝： PLASTIC, MO-150AE, SSOP-20
文件頁數(shù)： 4/10頁
文件大小： 289K
代理商： ISL83384ECA-T
4
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
μ
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 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
μ
F capacitors for the
voltage doubler and inverter functions over the full V
CC
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
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 900Kbps.
Transmitter inputs float if left unconnected (there are no pull-
up resistors), and may cause I
CC
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,
C
L
= 1000pF
Receiver Input to Receiver
Output, C
L
= 150pF
t
PHL
t
PLH
Full
-
0.6
3.5
μ
s
Full
-
0.7
3.5
μ
s
Receiver Propagation Delay
t
PHL
t
PLH
Full
-
0.2
1
μ
s
Full
-
0.3
1
μ
s
Transmitter Output Enable Time
From SHDN Rising Edge to T
OUT
=
±
3V
From SHDN Falling Edge to T
OUT
=
±
5V
t
PHL
- t
PLH
(Note 4)
t
PHL
- t
PLH
R
L
= 3k
to 7k
,
Measured From 3V to -3V or
-3V to 3V
25
-
50
-
μ
s
Transmitter Output Disable Time
25
-
600
-
ns
Transmitter Skew
25
-
100
-
ns
Receiver Skew
25
-
100
-
ns
Transition Region Slew Rate
V
CC
= 3.3V, C
L
= 150pF to
2500pF
25
4
-
-
V/
μ
s
V
CC
= 4.5V, C
L
= 150pF to
2500pF
25
6
-
-
V/
μ
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
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: V
CC
= 3V to 5.5V, C
1
- C
4
= 0.1
μ
F; Unless Otherwise Specified.
Typicals are at T
A
= 25
o
C
(Continued)
PARAMETER
TEST CONDITIONS
TEMP
(
o
C)
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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ISL83384EIA 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:【15kV ESD Protected, +3V to +5.5V, 1 Microamp, 250Kbps, RS-232 Transmitter/Receiver
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