LTC491
SWITCHI G CHARACTERISTICS
SYMBOL
t
PLH
t
PHL
t
SKEW
t
r
, t
f
t
ZH
t
ZL
t
LZ
t
HZ
t
PLH
t
PHL
t
SKD
t
ZL
t
ZH
t
LZ
t
HZ
PARAMETER
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time From Low
Driver Disable Time From High
Receiver Input to Output
Receiver Input to Output
t
PLH
– t
PHL
Differential Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable From Low
Receiver Disable From High
C
L
= 15pF (Figures 3, 8) S1 Closed
C
L
= 15pF (Figures 3, 8) S2 Closed
C
L
= 15pF (Figures 3, 8) S1 Closed
C
L
= 15pF (Figures 3, 8) S2 Closed
C
L
= 100pF (Figures 4, 6) S2 Closed
C
L
= 100pF (Figures 4, 6) S1 Closed
C
L
= 15pF (Figures 4, 6) S1 Closed
C
L
= 15pF (Figures 4, 6) S2 Closed
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 7)
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V
±5%
CONDITIONS
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 5)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
PI FU CTIO S
NC (Pin 1):
Not Connected.
R (Pin 2):
Receiver Output. If the receiver output is enabled
(REB low), then if A > B by 200mV, R will be high. If A < B
by 200mV, then R will be low.
REB (Pin 3):
Receiver Output Enable. A low enables the
receiver output, R. A high input forces the receiver output
into a high impedance state.
DE (Pin 4):
Driver Output Enable. A high on DE enables the
driver outputs, Y and Z. A low input forces the driver
outputs into a high impedance state.
D (Pin 5):
Driver Input. If the driver outputs are enabled
(DE high), then a low on D forces the driver outputs Y low
and Z high. A high on D will force Y high and Z low.
GND (Pin 6):
Ground Connection.
GND (Pin 7):
Ground Connection.
NC (Pin 8):
Not Connected.
Y (Pin 9):
Driver Output.
Z (Pin 10):
Driver Output.
B (Pin 11):
Receiver Input.
A (Pin 12):
Receiver Input.
NC (Pin 13):
Not Connected.
V
CC
(Pin 14):
Positive Supply; 4.75V
≤
V
CC
≤
5.25V.
U
U
MIN
10
10
5
TYP
30
30
5
15
40
40
40
40
MAX
50
50
25
70
70
70
70
150
150
50
50
50
50
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
40
40
70
70
13
20
20
20
20
Note 3:
All typicals are given for V
CC
= 5V and temperature = 25°C.
U
U
491fa
3
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