PCA82C251
NXP Semiconductors
CAN transceiver for 24 V systems
LOW level. The microcontroller should react to this condition by switching the transceiver
back to normal operation (via pin 8). Because the receiver is slower in Standby mode, the
first message will be lost at higher bit rates.
Table 4.
Truth table of the CAN transceiver
Supply
TXD
CANH
CANL
Bus state
dominant
recessive
floating
RXD
0
1[1]
X[1]
4.5 V to 5.5 V
4.5 V to 5.5 V
4.5 V < VCC < 5.5 V
0
HIGH
LOW
1 (or floating) floating
X[2]
floating
floating if
floating if
VRs > 0.75VCC VRs > 0.75VCC
0 V < VCC < 4.5 V
floating
floating floating
floating
X[2]
[1] If another bus node is transmitting a dominant bit, then RXD is logic 0.
[2] X = don’t care.
Table 5.
Pin Rs summary
Condition forced at pin Rs
VRs > 0.75VCC
Mode
Resulting voltage or current at pin Rs
IRs < 10 A
Standby
10 A < IRs < 200 A
VRs < 0.3VCC
Slope control
High-speed
0.4VCC < VRs < 0.6VCC
IRs < 500 A
9. Limiting values
Table 6.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages are referenced to pin 2; positive input
current.
Symbol Parameter
Conditions
Min
0.3
0.3
36
36
36
36
200
55
40
40
Max
Unit
VCC
Vn
supply voltage
+7.0
V
DC voltage at pins 1, 4, 5 and 8
DC voltage at pin 6 (CANL)
VCC + 0.3 V
V6
0 V < VCC < 5.5 V; TXD HIGH or floating
0 V < VCC < 5.5 V; no time limit
0 V < VCC < 5.5 V; no time limit
0 V < VCC < 5.5 V; no time limit
see Figure 8
+36
V
[1]
[2]
+36
V
+36
V
V7
DC voltage at pins 7 (CANH)
transient voltage at pins 6 and 7
storage temperature
+36
V
Vtrt
+200
+150
+125
+150
V
Tstg
Tamb
Tvj
C
C
C
V
ambient temperature
[3]
[4]
[5]
virtual junction temperature
electrostatic discharge voltage
VESD
2500 +2500
250 +250
V
[1] TXD is LOW. Short-circuit protection provided for slew rates up to 5 V/s for voltages above +30 V.
[2] Short-circuit applied when TXD is HIGH, followed by TXD switched to LOW.
[3] In accordance with “IEC 60747-1”. An alternative definition of virtual junction temperature is: Tvj = Tamb + Pd Rth(vj-a), where Rth(j-a) is a
fixed value to be used for the calculation of Tvj. The rating for Tvj limits the allowable combinations of power dissipation (Pd) and ambient
temperature (Tamb).
[4] Classification A: human body model; C = 100 pF; R = 1500 ; V = 2000 V.
[5] Classification B: machine model; C = 200 pF; R = 25 ; V = 200 V.
PCA82C251
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 04 — 25 August 2011
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