L E D / P H O T O I C
Transmitter/receiver photo IC for optical link
L8628-01B, S8627-01B
For MOST automotive network, 50 Mbps band POF communications
L8628-01B and S8627-01B are transmitter and receiver photo ICs developed for MOST (Media Oriented System Transport) networks used in vehicles
to communicate multimedia information. The transmitter photo IC L8628-01B consists of a red LED, driver IC and current regulator chip incorporated
into a clear plastic package and can be set to an operating mode that reduces the optical output level by half. The receiver photo IC S8627-01B is a
monolithic photo IC fabricated by the PiN-BiP process and features a wide dynamic range. It also has a low power consumption "sleeping mode" and
an optical wakeup mode triggered by input of light. Both the transmitter and receiver photo IC input and output digital signals through a TTL interface.
Features
Applications
Only for vehicle networks (MOST)
L8628-01B
DC to 50 Mbps data communications
TTL input
Optical output 50 % cut mode
S8627-01B
Specifications of these products are subject to change
without prior notice to keep up with changes in the
MOST standard.
4 M to 50 Mbps data communications
Monolithic structure immune from external noise
TTL output
Wide dynamic range
Sleeping mode with optical wakeup
■ Absolute maximum ratings (Ta= 25 °C)
Parameter
Supply voltage
Symbol
Vcc
L8628-01B, S8627-01B
Unit
V
-0.5 to +7.0
Operating temperature
Storage temperature
Soldering
Topr
Tstg
Tsol
-40 to +95
-40 to +110
°C
C
°
260 °C, 5 s, 3 times, at least 2.5 mm away from lead root
°C
S8627-01B
■ Electrical and optical characteristics (Ta= -40 to +85 °C, Vcc=4.75 to 5.25 V)
Parameter
Current consumption
Symbol
Condition
Min.
-
Typ.
-
Max.
30
Unit
mA
1,
2
Icco
*
*
(operation mode)
Current consumption (sleeping mode)
Receiver level
Iccs
Popt3
Voh
Vol
tr
tf
tpwv
tapwd
Psl
Pop
Vmh
Vml
Dark state
-
-24
2.5
-
-
-
-
-
-
-
-
-
-
-
30
-3.5
-
0.4
9
7
29.8
+6.6
µA
dBm
V
Bi-phase signal
Ioh= -150 µm
Iol=1.6 mA
High level output voltage
Low level output voltage
Rise time
V
Vout
10 to 90 % *1,
*
2
ns
Fall time
Pulse width variation
Pulse width distortion (average value)
Operation to sleeping m ode transition receivable level
Sleeping m ode to operation transition receivable level
1, 2, 3,
5
5
18
-1.8
ns
ns
*
*
*
*
*
*
1, 2, 3,
*
*
1, 2,
4
-39
-
-25.5
dBm
*
*
*
Mode
out
High level voltage
Low level voltage
Ioh= -20 µA
Iol=0.88 mA
4.0
-
-
-
-
V
V
0.5
*1: Measured with input signals conforming to SP3 MOST specification of physical layer rev. 1.0.
*2: Measured with RL=50 kΩ, CL=15 pF (including parasitic capacitance such as probe, connector and evaluation circuit board
pattern), and threshold voltage=1.5 V.
*3: An optical input waveform is generated with a Hamamatsu standard transmitter.
*4: Average optical power is measured with a POF (NA=0.5).
*5: Measured with BiPhase PRBS at 45.2 Mbps (NRZ signal conversion).
Note) • If modulated light at 4 Mbps or less (including DC light and no light input) is input to S8627-01B, the high and low levels
cannot be discerned.
• A bypass capacitor (0.1 µF) connected between Vcc and GND at a position within 3 mm from the lead, and a 10
µF capacitor is also connected to the power supply line nearby.
• The optical axis of the package lens is exactly aligned with the center axis of the optical plug,
and the gap between the lens surface and the optical reference plane of the plug is 0.1 mm.
1