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参数资料
型号： HIN207ECA
厂商： HARRIS SEMICONDUCTOR
元件分类： 通用总线功能
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： LINE TRANSCEIVER, PDSO24
文件页数： 13/17页
文件大小： 247K
代理商： HIN207ECA
3-13
Detailed Description
The HIN2XXA family of high-speed RS-232
transmitters/receivers are powered by a single +5V power
supply, feature low power consumption, and meet all ElA
RS232C and V.28 specifications. The circuit is divided into
three sections: the charge pump, transmitter, and receiver.
Charge Pump
An equivalent circuit of the charge pump is illustrated in
Figure 3. The charge pump contains two sections: The
voltage doubler and the voltage inverter. Each section is
driven by a two phase, internally generated clock to generate
+10V and -10V. The nominal clock frequency is 125kHz.
During phase one of the clock, capacitor C1 is charged to
V
CC
. During phase two, the voltage on C1 is added to V
CC
,
producing a signal across C3 equal to twice V
CC
. During
phase two, C2 is also charged to 2V
CC
, and then during
phase one, it is inverted with respect to ground to produce a
signal across C4 equal to -2V
CC
. The charge pump accepts
input voltages up to 5.5V. The output impedance of the
voltage doubler section (V+) is approximately 200
, and the
output impedance of the voltage inverter section (V-) is
approximately 450
. A typical application uses 0.1
μ
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, increasing
the values of the reservoir capacitors, C3 and C4, lowers the
ripple on the V+ and V- supplies.
During shutdown mode (HIN205A, HIN206A, HIN211A,
HIN213A, HIN235A, HIN236A and HIN241A, the charge
pump is turned off, V+ is pulled down to V
CC
, V- is pulled up
to GND, and the supply current is reduced to less than 10
μ
A.
The transmitter outputs are disabled and the receiver
outputs (except for HIN213A, R4 and R5) are placed in the
high impedance state.
Test Circuits (HIN232A)
FIGURE 1. GENERAL TEST CIRCUIT
FIGURE 2. POWER-OFF SOURCE RESISTANCE
CONFIGURATION
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
C1+
V+
C1-
C2+
C2-
V-
R2
IN
T2
OUT
V
CC
T1
OUT
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
GND
+4.5V TO
+5.5V INPUT
3k
T1 OUTPUT
RS-232
±
30V INPUT
TTL/CMOS OUTPUT
TTL/CMOS INPUT
TTL/CMOS INPUT
TTL/CMOS OUTPUT
+
-
0.1
μ
F
C3
+
-
0.1
μ
F
C1
+
-
0.1
μ
F
C2
+
-
0.1
μ
F C4
3k
OUTPUT
RS-232
±
30V INPUT
T2
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
C1+
V+
C1-
C2+
C2-
V-
R2
IN
T2
OUT
V
CC
T1
OUT
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
GND
T2
OUT
T1
OUT
V
IN
=
±
2V
A
R
OUT
= V
IN
/I
+
-C1
+
-C3
+
-C2
+
-C4
S1
S2
S5
S6
S3
S4
S7
S8
V
CC
GND
RC
OSCILLATOR
V
CC
GND
V+ = 2V
CC
GND
V- = - (V+)
C1+
C1-
C2-
C2+
VOLTAGE INVERTER
VOLTAGE DOUBLER
FIGURE 3. CHARGE PUMP
HIN202A thru HIN241A
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相关代理商/技术参数
参数描述
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