TFBS4650-TR4 VISHAY [Vishay Siliconix], TFBS4650-TR4 Datasheet - Page 6

• Manufacturer Part Number: TFBS4650-TR4
• Description: Infrared Transceiver 9.6 kbit/s to 115.2 kbit/s (SIR)
• Manufacturer: VISHAY [Vishay Siliconix]

Transmitter
T
Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
Note:
1)
is for minimum current consumption. This transceiver can be adapted to > 50 cm operation by increasing the current to > 200 mA, e.g.
operating the transceiver without current control resistor (i.e. R1 = 0 Ω) and using the internal current control.
Table 1.
Truth table
Document Number 84672
Rev. 1.2, 28-May-08
IRED operating current, current
controlled
Output leakage IRED current
Output radiant intensity
Output radiant intensity
Output radiant intensity
Saturation voltage of IRED
driver
Peak - emission wavelength
Optical rise time,
Optical fall time
Optical output pulse duration
Optical output pulse duration
Optical overshoot
amb
The radiant intensity can be adjusted by the external current limiting resistor to adapt the intensity to the desired value. The given value
= 25 °C, V
high
low
low
low
low
low
SD
Parameter
CC
= 2.4 V to 3.6 V unless otherwise noted.
1)
1)
1)
high > 50 µs
TXD
high
low
low
low
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x
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controlled but also can be reduced by
V
V
α = 0°, 15°, TXD = High, SD = Low,
α = 0°, 15°, TXD = High, SD = Low,
CC1
CC1
(Receiver is inactive as long as
(resulting in about 50 mA drive
The IRED current is internally
Input pulse width t = 1.63 µs
Inputs
= 3.0 V, V
= 3.0 V, V
Input pulse width t < 30 µs
Input pulse width t ≥ 30 µs
V
TXD = Low or SD = High
V
an external resistor R1
CC1
CC
Test conditions
Tamb = 85°C
= 5.0 V, α = 0°, 15°
= 3.0 V, If = 50 mA
If = 300 mA
Optical input irradiance mW/m
SD = High)
current)
CC2
CC2
< Max. irradiance E
> Max. irradiance E
> Min. irradiance E
= 3.0 V, R1 = 30 Ω
= 3.0 V, R1 = 0 Ω,
< 4
x
x
x
e
e
e
Symbol
V
I
t
IRED
CEsat
t
2
ropt
t
t
t
fopt
I
λ
I
I
I
opt
opt
opt
D
e
e
e
p
,
Tri-state floating with a weak
pull-up to the supply voltage
1.45
Min.
200
880
20
30
4
low (echo on)
low (active)
Vishay Semiconductors
RXD
high
high
x
1.61
Typ.
886
0.4
25
50
t
Outputs
TFBS4650
Max.
0.04
400
150
900
100
300
2.2
20
1
www.vishay.com
Transmitter
I
0
0
0
0
0
e
mW/sr
mW/sr
mW/sr
Unit
mA
nm
µA
ns
µs
µs
µs
%
V
6