HS-245RH, HS-246RH, HS-248RH
the grounded input of the transmitter, and is less than 25V
negative with respect to the transmitter VCC. The current
mode system is totally unaffected by ground differential
noise of +2V at frequencies as high as 1MHz.
TABLE B. OVERALL TRANSMITTER/RECEIVER SWITCHING
CHARACTERISTICS
-55
o
C TO 125
o
C
HS-245RH, HS-246RH
HS-248RH
CHARACTERISTICS
Propagation Delay
TPLH
Propagation Delay
TPHL
Duty Cycle Distortion
TPLH - TPHL
NOTE:
MIN
-
-
-
TYP
18
18
2
MAX
40
40
15
UNITS
ns
ns
ns
Propagation Delay
The worst case propagation delay of a transmitter and
receiver, connected as shown in Figure 4, can be
determined by adding the maximum delay shown on the
data sheet for the transmitter and receiver. These overall
switching characteristics are shown in Table B. For the entire
system, however, the propagation delay of the transmission
line must also be considered. This delay, of course, depends
on the length of the line and the characteristics of the line,
but in general, delays of between 1.5ns and 3.0ns per foot
can be expected.
VCC = +5V, VEE = -5V.
Schematics
14VCC
2.7K
380Ω
2.7K
300Ω
2.0K
1
2
3
4
2.0K
5
6
8
9
10
11
12
13
φ
1
φ
1
IN OUT
T1
φ
2
φ
2
OUT IN
φ
1
φ
1
IN OUT
T2
φ
2
φ
2
OUT IN
φ
1
φ
1
IN OUT
T3
φ
2
φ
2
OUT IN
FIGURE 6. HS-245RH
14VCC
13VCC
6K
4.1K
(R1) OUTPUT
3
6
(R2) OUTPUT
10
(R3) OUTPUT
(R1) +INPUT
2
50Ω
GND
7
2.7K
-INPUT
1
(R1)
50Ω
+INPUT
5
(R2)
-INPUT
4
(R2)
+INPUT
9
(R3)
-INPUT
8
(R3)
12VEE
R1
R2
11VEE
R3
FIGURE 7. HS-246RH, HS-248RH
NOTES:
1. HS-246RH does not have 6K output pull-up resistors.
2. HS-248RH does not have 50Ω input termination resistors.
6
INTERSIL [ INTERSIL CORPORATION ]
