參數(shù)資料
型號(hào)： ISL4245E
廠(chǎng)商： Intersil Corporation
元件分類(lèi)： RS-232
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： 5V的高速RS - 232收發(fā)器與0.1uF電容
文件頁(yè)數(shù)： 8/17頁(yè)
文件大小： 457K
代理商： ISL4245E
8
Detailed Description
These interface ICs operate from a single +2.7V to +5.5V
supply, guarantee a 250kbps (ISL4238E/44E) / 1Mbps
(ISL4245E) minimum data rate, require only four small
external 0.1
μ
F 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
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. 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 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.
The ISL4238E/44E 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 1Mbps.
The ISL4245E guarantees a 1Mbps data rate for full load
conditions (3k
and 250pF), 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 1.4Mbps.
Receiver Output Enable Time
Normal Operation, R
L
= 1k
to 0.5V
CC
, C
L
= 15pF
25
-
200
350
ns
Full
-
200
400
ns
Receiver Output Disable Time
Normal Operation, R
L
= 1k
to 0.5V
CC
, C
L
= 15pF
25
-
350
500
ns
Full
-
400
600
ns
Transmitter Output Enable Time
ISL4238E/44E/45E
Normal Operation, R
L
= 3k
, C
L
= 1000pF
25
-
25
40
μ
s
Full
-
35
50
μ
s
Transmitter Output Disable Time
ISL4238E/44E/45E
Normal Operation, R
L
= 3k
, C
L
= 1000pF
25
-
2.5
4
μ
s
Full
-
2.7
4
μ
s
Transition Region Slew Rate
ISL4238E/44E
V
CC
= 3V to 3.6V,
R
L
= 3k
to 7k
,
Measured From 3V to -3V
or -3V to 3V
C
L
= 150pF to 1000pF
25
6
11
30
V/
μ
s
Full
6
10
30
V/
μ
s
C
L
= 150pF to 2500pF
25
4
9
30
V/
μ
s
Full
4
8
30
V/
μ
s
Transition Region Slew Rate
ISL4245E
V
CC
= 3V to 3.6V, R
L
= 3k
to 7k
,
Measured From 3V to
-3V or -3V to 3V, C
L
= 150pF to 1000pF
25
24
40
150
V/
μ
s
Full
24
35
150
V/
μ
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
Human Body Model
25
-
±
15
-
kV
IEC6100-4-2 Air Gap Discharge
25
-
±
15
-
kV
IEC6100-4-2 Contact Discharge
25
-
±
8
-
kV
All Other Pins
Human Body Model
25
-
±
3
-
kV
NOTES:
4. ISL4238E inputs utilize a positive feedback resistor. The input current is negligible when the input is at either supply rail.
5. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
6. Skew is measured at the receiver input switching points (1.4V).
7. Skew is measured at the transmitter zero crossing points.
Electrical Specifications
Test Conditions: ISL4238E V
CC
= 3.15V to 5.5V, C
1
- C
4
= 0.1
μ
F; V
CC
= 3V, C
1
- C
4
= 0.22
μ
F;
ISL424XE 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
PARAMETER
TEST CONDITIONS
TEMP
(
o
C)
MIN
TYP
MAX
UNITS
ISL4238E, ISL4244E, ISL4245E
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ISL4245EIR 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
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ISL4244E QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown(QFN封裝, ±15kV ESD 防護(hù), +2.7V至+5.5V, 10Nanoamp, 250kbps/1Mbps, 具有自動(dòng)斷電功能的RS-232收發(fā)器)
ISL4238EIRZ 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
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