Read Sharp LC-26D44E (serv.man6) Service Manual online
LC-26D44E/S/RU-BK/GY
5 – 3
4. IC1501 (VHIISL83220-1Y)
+/-15kV ESD Protected, +3V to +5.5V, 1Microamp, 250kbps, RS-232 Transmitters/Receivers.
The ISL83220E is a 3.0V to 5.5V powered RS-232 transmitter/ receiver which meets ElA/TIA-232 and V.28/ V.24 specifications, even at VCC = 3.0V.
Additionally, it provides 15kV ESD protection (IEC 1000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232
pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power
consumption is critical. Efficient on-chip charge pumps, coupled with a manual power down function, reduce the standby supply current to a 1 A
trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are
guaranteed at worst case load conditions. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only sys-
tems.
Additionally, it provides 15kV ESD protection (IEC 1000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232
pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power
consumption is critical. Efficient on-chip charge pumps, coupled with a manual power down function, reduce the standby supply current to a 1 A
trickle. Small footprint packaging, and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are
guaranteed at worst case load conditions. This family is fully compatible with 3.3V only systems, mixed 3.3V and 5.0V systems, and 5.0V only sys-
tems.
5
NC
---
No connection.
6
IN2A
I
Video signal input terminal (CH-2, A input)
7
IN2B
I
Video signal input terminal (CH-2, B input)
8
VCC
---
Analog power supply.
9
IN3A
I
Video signal input terminal (CH-3, A input)
10
IN3B
I
Video signal input terminal (CH-3, B input)
11
MUXSEL
I
Input multiplexer select terminal.
12
SCL
I
I2C clock signal input.
13
SDA
I/O
I2C data signal in-output.
14
VDD
---
Digital power supply.
15
GND
---
Ground.
16
OUT3
O
Video signal output terminal (CH-3)
17
VCC
---
Analog power supply.
18
OUT2
O
Video signal output terminal (CH-2)
19
GND
---
Ground.
20
OUT1
O
Video signal output terminal (CH-1)
21
VCC
---
Analog power supply.
22
REF2
O
Internal reference voltage 2.
23
REF1
O
Internal reference voltage 1.
24
ADS
I
I2C slave address setting terminal (3 states).
Pin No.
Pin Name
I/O
Pin Function
1
EN
I
Active low receiver enable control; doesn't disable ROUTB outputs.
2
C1+
---
External capacitor (voltage doubler) is connected to this lead.
3
V+
---
Internally generated positive transmitter supply.
4
C1-
---
External capacitor (voltage doubler) is connected to this lead.
5
C2+
---
External capacitor (voltage inverter) is connected to this lead.
6
C2-
---
External capacitor (voltage inverter) is connected to this lead.
7
V-
---
Internally generated negative transmitter supply.
8
RIN
I
±15kV ESD Protected, RS-232 compatible receiver inputs.
9
ROUT
O
TTL/CMOS level receiver outputs.
10
N.C.
---
No connection.
11
TIN
I
TTL/CMOS compatible transmitter Inputs.
12
N.C.
---
No connection.
13
TOUT
O
±15kV ESD Protected, RS-232 level transmitter outputs.
14
GND
---
Ground.
15
VCC
---
System power supply input.
16
SHDN
I
Active low input shuts down transmitters and on-board power supply, to place device in low power
mode.
mode.
Pin No.
Pin Name
I/O
Pin Function
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