HIN232ACBZ-T Intersil, HIN232ACBZ-T Datasheet - Page 4

• Manufacturer Part Number: HIN232ACBZ-T
• Description: IC 2DRVR/2RCVR RS232 5V 16-SOIC
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of HIN232ACBZ-T

• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Mounting Type: Surface Mount
• Voltage - Supply: 4.5 V ~ 5.5 V
• Number Of Drivers/receivers: 2/2
• Protocol: RS232
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Test Circuits (HIN232A)
Detailed Description
The HIN232A is a high-speed RS-232 transmitter/receiver
that is powered by a single +5V power supply, features low
power consumption, and meets 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
producing a signal across C3 equal to twice V
phase two, C2 is also charged to 2V
phase one, it is inverted with respect to ground to produce a
signal across C4 equal to -2V
input voltages up to 5.5V. The output impedance of the
CC
±30V INPUT
. During phase two, the voltage on C1 is added to V
3kΩ
0.1µF
OSCILLATOR
RS-232
0.1µF
OUTPUT
GND
0.1µF
C1
V
T2
CC
C2
C3
RC
0.1µF C4
FIGURE 1. GENERAL TEST CIRCUIT
+
+
-
-
+
+
-
-
S1
1
2
3
4
5
6
7
8
S3
C1+
V+
C1-
C2+
C2-
V-
T2
R2
VOLTAGE DOUBLER
OUT
IN
CC
R1
R2
T1
4
C1+
GND
R1
C1-
T1
T2
V
OUT
OUT
OUT
. The charge pump accepts
CC
+
IN
IN
IN
-
C1
16
15
14
13
12
10
CC
11
9
S2
S4
, and then during
RS-232 ±30V INPUT
TTL/CMOS OUTPUT
TTL/CMOS INPUT
TTL/CMOS INPUT
TTL/CMOS OUTPUT
+5.5V INPUT
+4.5V TO
T1 OUTPUT
CC
3kΩ
. During
+
-
FIGURE 3. CHARGE PUMP
C3
V
CC
CC
HIN232A
,
V+ = 2V
GND
CC
voltage doubler section (V+) is approximately 200Ω, and the
output impedance of the voltage inverter section (V-) is
approximately 450Ω. A typical application uses 0.1µF
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.
Transmitters
The transmitters are TTL/CMOS compatible inverters which
translate the inputs to RS-232 outputs. The input logic threshold
is about 26% of V
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 400kΩ 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 specifications of ±5V minimum with the worst case
conditions of: all transmitters driving 3kΩ minimum load
FIGURE 2. POWER-OFF SOURCE RESISTANCE
S5
S7
VOLTAGE INVERTER
CONFIGURATION
C2+
C2-
CC
+
-
C2
R
, or 1.3V for V
OUT
V
1
2
3
4
5
6
7
8
IN
S6
S8
= V
C1+
V+
C1-
C2+
C2-
V-
T2
R2
= ±2V
OUT
IN
IN
/I
R1
R2
T1
T2
GND
CC
R1
T1
T2
V
OUT
OUT
OUT
OUT
CC
T1
A
IN
IN
IN
+
-
= 5V. A logic 1 at the
OUT
C4
16
15
14
13
12
11
10
9
GND
V- = - (V+)