Specifications

20
HFBR-24X2 Low-Cost
5MBd Receiver
Description
The HFBR-24X2 fiber optic
receiver is designed to operate
with the Hewlett-Packard HFBR-
14XX fiber optic transmitter and
50/125 µm, 62.5/125 µm, 100/
140 µm, and 200 µm HCS
®
fiber
optic cable. Consistent coupling
into the receiver is assured by the
lensed optical system (Figure 1).
Response does not vary with fiber
size ≤0.100 µm.
The HFBR-24X2 receiver incor-
porates an integrated photo IC
containing a photodetector and
dc amplifier driving an open-
collector Schottky output
Housed Product
Unhoused Product
transistor. The HFBR-24X2 is
designed for direct interfacing to
popular logic families. The
absence of an internal pull-up
resistor allows the open-collector
output to be used with logic
families such as CMOS requiring
voltage excursions much higher
than V
CC
.
Both the open-collector “Data”
output Pin 6 and V
CC
Pin 2 are
referenced to “Com” Pin 3, 7. The
“Data” output allows busing,
strobing and wired “OR” circuit
configurations. The transmitter is
designed to operate from a single
+5 V supply. It is essential that a
bypass capacitor (0.1 µF
ceramic) be connected from
Pin 2 (V
CC
) to Pin 3 (circuit
common) of the receiver.
Absolute Maximum Ratings
Parameter Symbol Min. Max. Units Reference
Storage Temperature T
S
-55 +85 °C
Operating Temperature T
A
-40 +85 °C
Lead Soldering Cycle Temp. +260 °C Note 1
Time 10 sec
Supply Voltage V
CC
-0.5 7.0 V
Output Current I
O
25 mA
Output Voltage V
O
-0.5 18.0 V
Output Collector Power Dissipation P
O AV
40 mW
Fan Out (TTL) N 5 Note 2
PIN FUNCTION
1
2
3
4
V
CC
(5 V)
COMMON
DATA
COMMON