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LT1796 Datasheet(PDF) 6 Page - Linear Technology

Part No. LT1796
Description  Overvoltage Fault Protected CAN Transceiver
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1796 Datasheet(HTML) 6 Page - Linear Technology

   
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6
LT1796
1796f
FU CTIO TABLES
Driver Output
INPUTS
BUS TERMINALS
TXD
RS
CANH
CANL
OPERATING STATE
0VRS < 3V
High
Low
Dominant
0VRS > 4V
Hi-Z
Hi-Z
Standby
1VRS < 3V
Hi-Z
Hi-Z
Recessive
1VRS > 4V
Hi-Z
Hi-Z
Standby
Receiver Output
BUS VOLTAGE
VBUS = VCANH – VCANL
RS
RXD
RESPONSE TIME
VBUS < 0.5V
< 3V
High
Fast
0.5V
≤ VBUS ≤ 0.9V
< 3V
Indeterminate
Fast
VBUS > 0.9V
< 3V
Low
Fast
VBUS < 0.5V
> 4V
High
Slow
0.5V
≤ VBUS ≤ 0.9V
> 4V
Indeterminate
Slow
VBUS > 0.9V
> 4V
Low
Slow
TI I G DIAGRA S
2.5V
VDIFF = VCANH – VCANL
5V
TXD
0V
VDIFF
VDIFFLO
VDIFFHI
25%
50%
1796 F02
tTXDOFF
tTXDON
2.5V
Figure 2. Driver Delay Waveforms
2.5V
5V
TXD
0V
RXD
0V
2V
0.8V
1796 F03
tLBOFF
tLBON
2.5V
Figure 3. Loopback Delay Waveforms
3V
CANL = 2.5V
3.5V
CANH
2.5V
RXD
0.8V
2V
1796 F04
tRXDON
tRXDOFF
3V
Figure 4. Reciever Delay Waveforms
2.5V
5V
RS
0V
RXD
0.8V
1796 F05
tWAKE
Figure 5. Wake Up from Standby Waveforms
TEST CIRCUIT
5V
0.1
µF
7
3
1
46
1796 F01
RS
100pF
28
5
30pF
TXD
RXD
CANH
CANL
RS
VREF
GND
60
Figure 1. Switching Test Circuit
BLOCK DIAGRA
RX
CANH
CANL
1796 BD
GND
VREF
SLOPE/
STANDBY
REFERENCE
VOLTAGE
DRIVER
VCC
3
7
6
2
5
RXD
4
RS
8
TXD
1


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