TFBS4652 Vishay, TFBS4652 Datasheet - Page 6

• Manufacturer Part Number: TFBS4652
• Description: Infrared Transceiver 9.6 Kbit/s To 115.2 Kbit/s Sir
• Manufacturer: Vishay

TFBS4652
Vishay Semiconductors
Transmitter
T
Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
*)
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
www.vishay.com
136
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.
high > 100 µs
)
)
)
TXD
high
low
low
low
x
The IRED current is internally
controlled but also can be
reduced by an external resistor
R1
Tamb = 85°C
α = 0°, 15°, TXD = High, SD =
Low, V
R1 = 30 Ω (resulting in about
50 mA drive current)
α = 0°, 15°, TXD = High, SD =
Low, V
R1 = 0 Ω, If = 300 mA
V
TXD = Low or SD = High
(Receiver is inactive as long as
SD = High)
V
Input pulse width t < 30 µs
Input pulse width t ≥ 30 µs
Input pulse width t = 1.63 µs
CC1
CC
Inputs
= 3.0 V, If = 50 mA
= 5.0 V, α = 0°, 15°
CC1
CC1
Test Conditions
= 3.0 V, V
= 3.0 V, V
Optical input Irradiance mW/m
< Max. irradiance E
> Max. irradiance E
> Min. irradianceE
CC2
CC2
= 3.0 V,
= 3.0 V,
< 2
x
x
x
e
e
e
Symbol
V
I
t
IRED
CEsat
t
ropt
t
t
t
λ
fopt
I
opt
opt
opt
I
I
I
D
e
e
e
p
2
,
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)
RXD
high
high
x
1.61
Typ.
886
0.4
25
50
t
Outputs
Document Number 84671
Max
0.04
400
150
900
100
300
2.2
20
1
Rev. 1.1, 03-Jul-06
Transmitter
I
0
0
0
0
0
e
mW/sr
mW/sr
mW/sr
Unit
mA
nm
µA
ns
µs
µs
µs
%
V