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| 型号： | ICL232CBEZ |
| 厂商： | Intersil |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC TXRX DUAL RS232 5V 16SOIC |
| 标准包装： | 48 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
5
FN3020.7
July 28, 2005
Detailed Description
The ICL232 is a dual RS-232 transmitter/receiver powered by
a single +5V power supply which meets all ElA RS232C
specifications and features low power consumption. The
functional diagram illustrates the major elements of the
ICL232. The circuit is divided into three sections: a voltage
doubler/inverter, dual transmitters, and dual receivers Voltage
Converter.
An equivalent circuit of the dual charge pump is illustrated in
Figure 5.
The voltage quadrupler contains two charge pumps which use
two phases of an internally generated clock to generate +10V
and -10V. The nominal clock frequency is 16kHz. During
phase one of the clock, capacitor C1 is charged to VCC.
During phase two, the voltage on C1 is added to VCC,
producing a signal across C2 equal to twice VCC. At the same
time, C3 is also charged to 2VCC, and then during phase one,
it is inverted with respect to ground to produce a signal across
C4 equal to -2VCC. The voltage converter accepts input
voltages up to 5.5V. The output impedance of the doubler (V+)
is approximately 200
, and the output impedance of the
inverter (V-) is approximately 450
. Typical graphs are
presented which show the voltage converters output vs input
voltage and output voltages vs load characteristics. The test
circuit (Figure 3) uses 1
F capacitors for C1-C4, however, the
value is not critical. Increasing the values of C1 and C2 will
lower the output impedance of the voltage doubler and
inverter, and increasing the values of the reservoir capacitors,
C3 and C4, lowers the ripple on the V+ and V- supplies.
Transmitters
The transmitters are TTL/CMOS compatible inverters which
translate the inputs to RS-232 outputs. The input logic
threshold is about 26% of VCC , or 1.3V for VCC = 5V. A logic
1 at the input results in a voltage of between -5V and V- at the
output, and a logic 0 results in a voltage between +5V and (V+
- 0.6V). Each transmitter input has an internal 400k
pullup
resistor so any unused input can be left unconnected and its
output remains in its low state. The output voltage swing
meets the RS-232C specification of
±5V minimum with the
worst case conditions of: both transmitters driving 3k
minimum load impedance, VCC = 4.5V, and maximum
allowable operating temperature. The transmitters have an
internally limited output slew rate which is less than 30V/
s.
The outputs are short circuit protected and can be shorted to
ground indefinitely. The powered down output impedance is a
9
R2out
Receiver 2 TTL/CMOS output.
10
T2IN
Transmitter 2 TTL/CMOS input, with internal 400K pullup resistor to VCC.
11
T1IN
Transmitter 1 TTL/CMOS input, with internal 400K pullup resistor to VCC.
12
R1OUT
Receiver 1 TTL/CMOS output.
13
R1IN
RS-232 Receiver 1 input, with internal 5K pulldown resistor to GND.
14
T1OUT
RS-232 Transmitter 1 output
±10V (typical).
15
GND
Supply Ground.
16
VCC
Positive Power Supply +5V
±10%
Pin Descriptions (Continued)
PDIP, CERDIP
SOIC
PIN NAME
DESCRIPTION
+
-
C1
+
-
C3
+
-
C2
+
-
C4
S1
S2
S5
S6
S3
S4
S7
S8
VCC
GND
RC
OSCILLATOR
VCC
GND
V+ = 2VCC
GND
V- = -(V+)
C1+
C1
-
C2
-
C2+
VOLTAGE INVERTER
VOLTAGE DOUBLER
FIGURE 5. DUAL CHARGE PUMP
T1IN, T2IN
T1OUT, T2OUT
VOH
VOL
tr
tf
90%
10%
Instantaneous
Slew Rate (SR)
=
(0.8) (VOH - VOL)
tr
or
(0.8) (VOL - VOH)
tf
FIGURE 6. SLEW RATE DEFINITION
ICL232
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