Obsolete Product(s) - Obsolete Product(s)Obsolete Product(s) - Obsolete Product(s)
Electrical characteristics ST491A
6/17
4 Electrical characteristics
Table 5. Electrical characteristics
(V
CC
= 4.5V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are
referred to T
A
=25°C)
Symbol Parameter Min. Typ. Max. Unit
I
SUPPLY
No load supply current 2 5 mA
C
IN
Input capacitance 1.8 pF
C
YZ
Driver output capacitance 1.2 pF
C
OUT
Output capacitance 2.3 pF
Table 6. Transmitter electrical characteristics
(V
CC
= 4.5V to 5.5V, T
A
= -40 to 85°C, unless otherwise specified. Typical values are
referred to T
A
=25°C)
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
OD1
Differential drive output (no load) V
CC
V
V
OD2
Differential drive output (with
load)
R
L
= 54Ω (RS-422) (Figure 1.)1.52.6 5 V
V
OD3
Differential drive output (with
load)
R
L
= 100Ω (RS-422) (Figure 1.)2 3 V
ΔV
OD
Change in magnitude of driver
differential output voltage for
complementary output states
R
L
= 54Ω or 100Ω (Figure 1.)00.2V
V
OC
Driver common mode output
voltage
R
L
= 54Ω (Figure 1.)13V
ΔV
OC
Change in magnitude of driver
common mode output voltage
R
L
= 54Ω (Figure 1.)00.2V
I
OFF
Power off output current V
CC
= 0V, V
O
=-7V to 12V ± 100 μA
I
OSD
Driver short circuit output current V
O
=-7V to 12V ± 35 ± 250 mA
V
IL
Input logic threshold low 0.8 V
V
IH
Input logic threshold high 2 V
