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參數(shù)資料
| 型號(hào)： | ICL3217E |
| 廠商： | Intersil Corporation |
| 英文描述： | +/- 15kV ESD Protected, +3V to +5.5V, Low Power, 250kbps, RS-232 Transmitters/Receivers( +/-15KV ESD 保護(hù)，工作電壓3~5.5V，低功耗，250KBPS，RS232收發(fā)器) |
| 中文描述： | / - 15kV的ESD保護(hù)，3V至5.5V，低功耗，250kbps的和RS - 232發(fā)送器/接收器（/ - 15KV靜電保護(hù)，工作電壓3?5.5V的低功耗，高達(dá)250Kbps，RS232串口收發(fā)器） |
| 文件頁(yè)數(shù)： | 5/12頁(yè) |
| 文件大?。?/td> | 329K |
| 代理商： | ICL3217E |
5
Detailed Description
The ICL32X7E 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 capacitors,
feature low power consumption, and meet all ElA RS-232C
and V.28 specifications. The circuit is divided into three
sections: charge pump, transmitters and receivers.
Charge-Pump
Intersil’s new ICL32XXE 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 3V. 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 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.
ICL3217E transmitter outputs disable and assume a high
impedance state when the device enters the automatic
powerdown mode. These outputs may be driven to
±
12V
when disabled.
Both 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 800kbps.
Transmitter inputs float if left unconnected, and may cause
I
CC
increases. Connect unused inputs to GND for the best
performance.
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
(ICL3217E 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
= 3.15V, C
1
- C
4
= 0.1
μ
F, R
L
= 3k
,
C
L
= 1000pF
V
CC
= 3.0V, C
1
- C
4
= 0.22
μ
F, R
L
= 3k
,
C
L
= 1000pF
V
CC
≥
4.5V, C
1
- C
4
= 0.1
μ
F, R
L
= 3k
,
C
L
= 1000pF
Receiver Input to Receiver
Output, C
L
= 150pF
Full
250
500
-
kbps
Full
250
286
-
kbps
Full
250
310
-
kbps
Receiver Propagation Delay
t
PHL
t
PLH
25
-
0.3
-
μ
s
25
-
0.3
-
μ
s
Transmitter Skew
t
PHL
- t
PLH
t
PHL
- t
PLH
V
CC
= 3.3V, R
L
= 3k
to 7k
,
Measured From +3V to -3V or -3V
to +3V
Full
-
200
1000
ns
Receiver Skew
Full
-
100
500
ns
Transition Region Slew Rate
C
L
= 200pF to 2500pF
C
L
= 200pF to 1000pF
25
4
15
30
V/
μ
s
25
6
15
30
V/
μ
s
ESD PERFORMANCE
RS-232 Pins (T
OUT
, R
IN
)
IEC61000-4-2, Air-Gap Discharge Method
25
-
±
15
-
kV
IEC61000-4-2, Contact Discharge Method
25
-
±
8
-
kV
Human Body Model
25
-
±
15
-
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°C
(Continued)
PARAMETER
TEST CONDITIONS
TEMP
(°C)
MIN
TYP
MAX
UNITS
ICL3207E, ICL3217E
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