參數(shù)資料
型號(hào)： ICL3207
廠商： Intersil Corporation
英文描述： Low Power, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers(低功耗RS-232收發(fā)器（5發(fā)3收）)
中文描述： 低功耗，3V至5.5V，250kbps的和RS - 232發(fā)送器/接收器（低功耗的RS - 232收發(fā)器（5發(fā)3收））
文件頁(yè)數(shù)： 4/9頁(yè)
文件大小： 93K
代理商： ICL3207
4
Detailed Description
The ICL32X7 interface ICs operate from a single +3V to
+5.5V power supply, guarantee a 250kbps minimum data
rate, require only four small external 0.1
μ
F/0.22
μ
F (5V/3.3V)
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 ICL32XX 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 0.22
μ
F capacitors for the
voltage doubler and inverter functions at V
CC
= 3.3V. See
the “Capacitor Selection” section, and Table 3 for capacitor
recommendations for other operating conditions. 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.
Input Threshold Low
V
CC
= 3.3V
25
0.6
1.2
-
V
V
CC
= 5.0V
25
0.8
1.5
-
V
Input Threshold High
V
CC
= 3.3V
25
-
1.5
2.4
V
V
CC
= 5.0V
25
-
1.8
2.4
V
Input Hysteresis
25
-
0.3
-
V
Input Resistance
25
3
5
7
k
TRANSMITTER OUTPUTS
Output Voltage Swing
All Transmitter Outputs Loaded with 3k
to Ground
Full
±
5.0
±
5.4
-
V
Output Resistance
V
CC
= V+ = V- = 0V, Transmitter Output =
±
2V
Full
300
10M
-
Output Short-Circuit Current
Full
-
±
35
±
60
mA
Output Leakage Current
(ICL3217 Only)
V
OUT
=
±
12V, V
CC
= 0V or 3V to 5.5V
In Automatic Powerdown
Full
-
-
±
25
μ
A
TIMING CHARACTERISTICS
Maximum Data Rate
(One Transmitter Switching)
V
CC
= 3.0V, C
1
- C
4
= 0.22
μ
F, R
L
= 3k
,
C
L
= 1000pF
Full
250
286
-
kbps
V
CC
≥
4.5V, C
1
- C
4
= 0.1
μ
F, R
L
= 3k
,
C
L
= 1000pF
Full
250
310
-
kbps
Receiver Propagation Delay
Receiver Input to Receiver
Output, C
L
= 150pF
t
PHL
25
-
0.3
-
μ
s
t
PLH
25
-
0.3
-
μ
s
Transmitter Skew
t
PHL
- t
PLH
Full
-
200
1000
ns
Receiver Skew
t
PHL
- t
PLH
Full
-
100
500
ns
Transition Region Slew Rate
V
CC
= 3.3V,
R
L
= 3k
to 7k
,
Measured From +3V to -3V or -3V
to +3V
C
L
= 200pF to 2500pF
25
4
15
30
V/
μ
s
C
L
= 200pF to 1000pF
25
6
15
30
V/
μ
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
IEC1000-4-2, Air-Gap Discharge Method
25
-
±
6
-
kV
IEC1000-4-2, Contact Discharge Method
25
-
±
8
-
kV
Human Body Model
25
-
>±
8
-
kV
All Other Pins
Human Body Model
25
-
±
2
-
kV
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
ICL3207, ICL3217
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