HCPL-7720 Datasheet, PDF (13/18 Pages) Agilent(Hewlett-Packard) – 40 ns Propagation Delay CMOS Optocoupler

Implementing CC-Link with the
HCPL-772X/072X
CC-Link (Control and
Communication Link) is
developed to merge control and
information in the low-level
network (field network) by PCs,
thereby making the multivendor
environment a reality. It has data
control and message-exchange
function, as well as bit control
function, and operates at the
speed up to 10 Mbps.
Power Supplies and Bypassing
The recommended CC-Link circuit
is shown in Figure 17. Since the
HCPL-772X/072X are fully
compatible with CMOS logic level
signals, the optocoupler is
connected directly to the
transceiver. Two bypass
capacitors (with values between
0.01 µF and 0.1 µF) are required
and should be located as close as
possible to the input and output
power supply pins of the HCPL-
772X/072X. For each capacitor,
the total lead length between both
ends of capacitor and the power
supply pins should not exceed 20
mm. The bypass capacitors are
required because of the high
speed digital nature of the signals
inside the optocoupler.
FIL
DA
DB
DG
SLD
FG
SN75ALS181NS
V_CC
V_CC
A
R
B
RE
DE
Y
D
Z
GND
GND
V_DD2
V_DD1
(5 V) HCPL-7720#500 (5 V)
0.1 µ
V_DD1
V_I
GND₁
V_DD2
V_O
GND
10 K
0.1 µ
GND₂
GND₁
0.1 µ
HCPL-7720#500
V_DD2
V_O
GND
V_DD1
V_I
GND
0.1 µ
RD1
SD
10 K
1K
0.1 µ
HC14
10 K
1K
0.1 µ
HC14
HCPL-2611#560
V_OE
NC
V_DD
V_O
+
–
GND
NC
390
HC14
MPU
BOARD
OUTPUT
HCPL-2611#560
V_OE
NC
V_DD
+
V_O
–
GND
NC
390
HC14
SDGATEON
Figure 17. Recommended CC-Link application circuit.
13