Avago Technologies ACPL-224-500E - Manual (Page 19)

AV02-4387EN 16 Avago Technologies
Digital Logic Interface/Level Shifting Applications
Description
The circuit shown is an interface
between two TTL gates using an
active output (totem pole) opto-
coupler, the HCPL-2201. A series
switching circuit drives the optocou-
pler LED. The designer chooses R
IN
to agree with the equation shown in
the schematic. The active output of
the HCPL-2201 can be directly con-
nected to a TTL gate, and no pull-up
resistor is required. The HCPL-2201
can sink enough current to handle
up to 16 LSTTL or 4 TTL loads.
Performance of Circuit
• Maximum optocoupler propa­
gation delay: 300 ns (refer to
alternative Avago parts for lower
propagation delay times)
• Typical signaling rate: dc to 5 MBd
(refer to alternative Avago parts
for higher speeds)
• Typical optocoupler LED drive
current: 2 mA
Benefits
• No pull­up resistor required on
the optocoupler output interface
• Low power dissipation on the op-
tocoupler input circuit
• Up to 20 V supply voltage for the
HCPL-2201
Alternative Avago Parts
1) HCPL-07XX, HCPL-2730/1, HCPL-
4701, 6N138/9, CNW138/9 Low
Input Current Optocouplers
2) HCPL-0201/11 Small-Outline
Logic-Gate Optocoupler
3) HCPL-52XX Hermetically Sealed
Logic-Gate Optocoupler
4) CNN2201/11 Widebody Logic-
Gate Optocoupler
5) HCPL-2230/1 Dual-Channel Log-
ic-Gate Optocoupler
6) HCPL-05XX, HCPL-2530/1,
HCNW135/6, 6N135/6 High
Speed Optocoupler
7) HCPL-250L/260L/270L, HC-
PL-050L/060L/070L 3.3V Opto-
couplers
TTL Interface with Series LED Drive
DATA
OUTPUT
DATA
INPUT
7
5
6
8
2
3
4
1
HCPL-2201
V
CC2
(+5 V)
V
CC2
GND
2 1
TTL/
LSTTL
V
CC1
(+5 V)
0.1 µF
TTL/
LSTTL
R
IN
TOTEM
POLE
OUTPUT
GATE
R
IN
= V - V - V CC1 F OL
I
F
RECOMMENDED R = 1.1 k Ω
IN