DRS4485 Datasheet, PDF (3/8 Pages) Aeroflex Circuit Technology – DRS4485 Dual RS485 Interface Transceiver

SWITCHING CHARACTERISTICS 4/
Parameter
Condition
Symbol
Min Typ Max
Unit
Driver input to output delay
Driver input to output delay
Driver output to output delay
Driver rise or fall time
Driver Output enable delay
Driver Output disable delay
Receiver input to output delay
Receiver rise or fall time
Receiver enable delay
Receiver disable delay
R_DIFF = 60W
See test ckt
Figure 2
I_O = 0
See test ckt
Figure 2
C_L = 15pF
t_PLH
t_PHL
t_SKEW
t_r, t_f
t_ZH
t_LZ
t_PLH
t_PHL
t_r, t_f
t_ZL
t_ZH
-
125 200
nS
-
80
150
nS
-
4
15
nS
-
100 150
nS
-
160 250
nS
-
220 350
nS
-
80
150
nS
-
90
150
nS
-
26
50
nS
-
90
150
nS
-
120 150
nS
Notes:
1/ The active element that makes up the device has been tested to 200krad(Si) to assure RHA designator level "R"
(100krad(Si)) of method 1019, Condition A of MIL-STD-883 at +25°C for these parameters. The element will be retested after
design or process changes that can affect RHA response of this element. Post Radiation test limits for the input current (IIN)
test, is Max = ±3uA.
2/ Current measurements are for both channels.
3/ Not tested, guaranteed by design to the specified limits.
4/ Min/Max values are for VCC = +5V ±5%, TC = -55°C to +125°C. Typical values are measured at VCC = +5V and TC = +25°C.
DRIVER FUNCTION TABLE
Inputs
DI
DE
H
H/OPEN
L
H/OPEN
X
L
Outputs
BUS
BUS N
H
L
OFF HiZ
L
H
OFF HiZ
RECEIVER FUNCTION TABLE
DIFF Input
> -100mV
< -500mV
X
OPEN
SHORT
RE
L
L
H/OPEN
X
X
Output
H
L
H
H
H
BUS
DI
BUSN
R
30
VODIFF
R Voc
30
CSHLD
1500pF
CDIFF
200pF
CSHLD
1500pF
+
RX OUT
–
CL
15pF
IOUT
DE
RE
FIGURE 2 – DRIVER/RECEIVER TIMING TEST CIRCUIT (Channel 1 or 2)
SCD4485 Rev G 12/5/14
3
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