Datasheet

3
LT1796
1796f
DC ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 4.75V to 5.25V, V
RS
= 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
TH
Differential Input Threshold Voltage V
RS
= 0V, –7V < V
CM
< 12V ● 0.5 0.9 V
for Receiver V
RS
= 5V, –7V < V
CM
< 12V ● 0.5 0.9 V
∆V
TH
Receiver Input Hysteresis –7V < V
CM
< 12V 70 mV
V
OH
Receiver Output High Voltage V
CC
= 4.75V, I
O
= –400µA, V
ID
= 500mV ● 3 3.6 V
V
OL
Receiver Output Low Voltage V
CC
= 4.75V, I
O
= 1.6mA, V
ID
= 900mV ● 0.15 0.4 V
I
SCR
Receiver Short-Circuit Current 0V < V
O
< V
CC
, V
CC
= 5.25V ● 72085 mA
V
REF
Reference Output Voltage –100µA < I
REF
< 100µA ● 2.25 2.5 2.7 V
V
REFSC
Reference Output Short-Circuit Current 0 < V
REF
< V
CC
● –20 20 mA
V
RSSB
R
S
Pin Standby Threshold V
CC
= 5V ● 2.5 2.8 4 V
I
RS
R
S
Input Current V
RS
= 5V, V
CC
= 5V ● 0.1 10 µA
V
RS
= 0V, V
CC
= 5V ● –270 –200 –140 µA
R
S
= 47k, V
CC
= 5V ● –90 –60 –40 µA
I
CC
Supply Current Dominant No Load, V
RS
= 0V, V
TXD
= 0V, V
CC
= 5.25V ● 4.3 7 mA
Recessive R
L
= 60Ω, V
RS
= 0V, V
TXD
= 5V, V
CC
= 5.25V ● 3.8 7 mA
Standby R
L
= 60Ω, V
RS
= 5V, V
CC
= 5.25V ● 0.8 1.5 mA
SWITCHI G CHARACTERISTICS
U
The ● denotes the specifications which apply over the full operating
temperature range. V
RS
= 0V unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
BIT
Minimum Bit Time (Note 3) ● 8 µs
F
MAX
Maximum Data Rate (Note 3) ● 125 kbps
t
TXDON
Driver Input to Bus Active Figures 1, 2 R
S
= 0k ● 300 500 ns
R
S
= 47k ● 350 1000 ns
t
TXDOFF
Driver Input to Bus Inactive Figures 1, 2 R
S
= 0k ● 500 1000 ns
R
S
= 47k ● 600 1500 ns
t
LBON
Loopback Delay Active Figures 1, 3 ● 0.6 1.5 µs
t
LBOFF
Loopback Delay Inactive Figures 1, 3 ● 1.5 3 µs
t
RXDOFF
Receiver Delay Off Figures 1, 4 ● 400 600 ns
t
RXDON
Receiver Delay On Figures 1, 4 ● 300 600 ns
t
RXDOFFSB
Receiver Delay Off, Standby V
RS
= 4V, Figures 1, 4 ● 1.5 4 µs
t
RXDONSB
Receiver Delay On, Standby V
RS
= 4V, Figures 1, 4 ● 14 µs
t
WAKE
Wake-Up Delay from Standby Figures 1, 5 ● 115 µs
SR
+
Positive Slew Rate R
S
= 0k ● 51265 V/µs
R
S
= 47k ● 2730 V/µs
SR
–
Negative Slew Rate R
S
= 0k ● 53665 V/µs
R
S
= 47k ● 2515 V/µs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Unless otherwise specified, testing done at V
CC
= 5V, T
A
= 25°C.
Note 3: Bit time and data rate specifications are guaranteed by driver and
receiver delay time measurements.