Datasheet

MCP2551
DS21667D-page 4  2003 Microchip Technology Inc.
TABLE 1-1: MODES OF OPERATION
TABLE 1-2: TRANSCEIVER TRUTH TABLE
FIGURE 1-1: SLEW RATE VS. SLOPE-CONTROL RESISTANCE VALUE
Mode Current at R
s
Pin Resulting Voltage at RS Pin
Standby -I
RS
< 10 µA V
RS
> 0.75 V
DD
Slope-control 10 µA < -IRS < 200 µA 0.4 VDD < VRS < 0.6 VDD
High-speed -IRS < 610 µA 0 < VRS < 0.3VDD
VDD VRS TXD CANH CANL Bus State
(1)
RXD
(1)
4.5V ≤ V
DD
≤ 5.5V V
RS
< 0.75 V
DD
0 HIGH LOW Dominant 0
1 or floating Not Driven Not Driven Recessive 1
V
RS > 0.75 VDD X Not Driven Not Driven Recessive 1
V
POR
< V
DD
< 4.5V
(See Note 3)
V
RS
< 0.75 V
DD
0 HIGH LOW Dominant 0
1 or floating Not Driven Not Driven Recessive 1
VRS > 0.75 VDD X Not Driven Not Driven Recessive 1
0 < V
DD
< V
POR
XXNot Driven/
No Load
Not Driven/
No Load
High Impedance X
Note 1: If another bus node is transmitting a dominant bit on the CAN bus, then RXD is a logic ‘0’.
2: X = “don’t care”.
3: Device drivers will function, although outputs are not ensured to meet the ISO-11898 specification.
0
5
10
15
20
25
10 20 30 40 49 60 70 76 90 100 110 120
Resistance (k
Ω
)
Slew Rate V/uS