Philips PCA82C251T-N3 Datasheet

DATA SH EET

Product specification
Supersedes data of 1997 Mar 14
File under Integrated Circuits, IC18

2000 Jan 13

INTEGRATED CIRCUITS

PCA82C251

CAN transceiver for 24 V systems

2000 Jan 13 2

Philips Semiconductors Productspecification

CAN transceiver for 24 V systems PCA82C251

FEATURES

• Fully compatible with the

“ISO 11898-24 V”

standard

• Slope control to reduce RFI

• Thermally protected

• Short-circuit proof to battery and ground in 24 V

powered systems

• Low-current standby mode

• An unpowered node does not disturb the bus lines

• At least 110 nodes can be connected

• High speed (up to 1 Mbaud)

• High immunity against electromagnetic interference.

GENERAL DESCRIPTION

The PCA82C251 is the interface between the CAN
protocol controller and the physical bus. It is primarily
intended for applications (up to 1 Mbaud) in trucks and
buses. The device provides differentialtransmit capability
to the bus and differential receive capability to the CAN
controller.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

supply voltage 4.5 5.5 V

I

CC

supply current standby mode − 275 µA

1/t

bit

maximum transmission speed non-return-to-zero 1 − Mbaud

V

CAN

CANH, CANL input/output voltage −36 +36 V

V

diff

differential bus voltage 1.5 3.0 V

T

amb

ambient temperature −40 +125 °C

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION CODE

PCA82C251 DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
PCA82C251T SO8 plastic small outline package; 8 leads body width 3.9 mm SOT96-1
PCA82C251U − bare die; 2840 × 1780 × 380 µm −

2000 Jan 13 3

Philips Semiconductors Productspecification

CAN transceiver for 24 V systems PCA82C251

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MBG613

SLOPE/

STANDBY

1

8

RECEIVER

4

REFERENCE

VOLTAGE

5

DRIVER

PROTECTION

2

7

3

6

V

CC

CANH
CANL

GND

V

ref

RXD

Rs

TXD

PCA82C251

PINNING

SYMBOL PIN DESCRIPTION

TXD 1 transmit data input
GND 2 ground
V

CC

3 supply voltage
RXD 4 receive data output
V

ref

5 reference voltage output
CANL 6 LOW-level CAN voltage

input/output

CANH 7 HIGH-level CAN voltage

input/output

Rs 8 slope resistor input

Fig.2 Pin configuration.

handbook, halfpage

1TXD
2
3
4

8Rs

GND CANH

V

CC

CANL

RXD

V

ref

7
6
5

MBG612

PCA82C251

2000 Jan 13 4

Philips Semiconductors Productspecification

CAN transceiver for 24 V systems PCA82C251

FUNCTIONAL DESCRIPTION

The PCA82C251 is the interface between the CAN
protocol controller and the physical bus. It is primarily
intended for applications up to 1 Mbaud in trucks and
buses. The device provides differential transmit capability
to the bus and differential receive capability to the CAN
controller. It is fully compatible with the

“ISO 11898-24 V”

standard.
A current limiting circuit protects the transmitter output

stage against short-circuit to positive and negative battery
voltage. Although the power dissipation is increased
during this fault condition, this feature will prevent
destruction of the transmitter output stage.

If the junction temperature exceeds a value of
approximately 160 °C, the limiting current of both
transmitter outputs is decreased. Because the transmitter
is responsible for the major part of the power dissipation,
this will result in a reduced power dissipation and hence a
lowerchip temperature. All other partsof the IC will remain
operating. The thermal protection is particularly needed
when a bus line is short-circuited.

The CANH and CANL lines are also protected against
electrical transients which may occur in an automotive
environment.

Pin 8 (Rs) allows three different modes of operation to be
selected: high-speed, slope control or standby.

For high-speed operation, the transmitter output
transistors are simply switched on and off as fast as
possible. In this mode, no measures are taken to limit the
rise and fall slope. Use of a shielded cable is
recommended to avoid RFI problems. The high-speed
mode is selected by connecting pin 8 to ground.

The slope control mode allows the use of an unshielded
twisted pair or a parallel pair of wires as bus lines.
To reduce RFI, the rise and fall slope should be limited.
The rise and fall slope can be programmed with a resistor
connected from pin 8 to ground. The slope is proportional
to the current output at pin 8.

If a HIGH level is applied to pin 8, the circuit enters a low
current standby mode. In this mode, the transmitter is
switched off and the receiver is switched to a low current.
If dominant bits are detected (differential bus voltage
>0.9 V), RXD will be switched to a 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 1 Truth table of the CAN transceiver

Notes

1. X = don’t care.

2. If another bus node is transmitting a dominant bit, then RXD is logic 0.

Table 2 Pin Rs summary

V

CC

TXD CANH CANL BUS STATE RXD

4.5 to 5.5 V 0 HIGH LOW dominant 0

4.5 to 5.5 V 1 (or floating) floating floating recessive 1

(2)

4.5<VCC< 5.5 V X

(1)

floating if

VRs> 0.75V

CC

floating if

VRs> 0.75V

CC

floating 1

(2)

0<VCC< 4.5 V floating floating floating floating X

(1)

CONDITION FORCED AT PIN Rs MODE RESULTING VOLTAGE OR CURRENT AT PIN Rs

V

Rs

> 0.75V

CC

standby −IRs<10µA

10 µA<−I

Rs

< 200 µA slope control 0.4VCC<VRs< 0.6V

CC

VRs< 0.3V

CC

high-speed −IRs< 500 µA

2000 Jan 13 5

Philips Semiconductors Productspecification

CAN transceiver for 24 V systems PCA82C251

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134); all voltages are referenced to pin 2;
positive input current.

Notes

1. TXD is LOW. Short-circuit protection provided for slew rates up to 5 V/µs 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=T

amb+Pd×Rth(vj-a)

, where R

th(vj-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 (T

amb

).

4. Classification A: human body model; C = 100 pF; R = 1500 Ω; V = ±2500 V.

5. Classification B: machine model; C = 200 pF; R = 0 Ω; V = ±250 V.

THERMAL CHARACTERISTICS

QUALITY SPECIFICATION

According to

“SNW-FQ-611 part E”

.

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

CC

supply voltage −0.3 +7.0 V

V

n

DC voltage at pins 1, 4, 5 and 8 −0.3 VCC+ 0.3 V

V

6

DC voltage at pin 6 (CANL) 0V<VCC< 5.5 V; TXD HIGH

or floating

−36 +36 V

0V<V

CC

< 5.5 V; no time

limit; note 1

−36 +36 V

0V<V

CC

< 5.5 V; no time

limit; note 2

−36 +36 V

V

7

DC voltage at pin 7 (CANH) 0V<VCC< 5.5 V; no time limit −36 +36 V

V

tr

transient voltage on pins 6 and 7 see Fig.8 −200 +200 V

T

stg

storage temperature −55 +150 °C

T

amb

ambient temperature −40 +125 °C

T

vj

virtual junction temperature note 3 −40 +150 °C

V

esd

electrostatic discharge voltage note 4 −2500 +2500 V

note 5 −250 +250 V

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th(j-a)

thermal resistance from junction to ambient in free air

PCA82C251 100 K/W
PCA82C251T 160 K/W

2000 Jan 13 6

Philips Semiconductors Productspecification

CAN transceiver for 24 V systems PCA82C251

CHARACTERISTICS

VCC= 4.5 to 5.5 V; T

amb

= −40 to + 125 °C; RL=60Ω; I8> −10 µA; unless otherwise specified; all voltages referenced
to ground (pin 2); positive input current; all parameters are guaranteed over the ambient temperature range by design,
but only 100% tested at +25 °C.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

I

3

supply current dominant; V1=1V;

VCC< 5.1 V

−−78 mA

dominant; V

1

=1V;

VCC< 5.25 V

−−80 mA

dominant; V

1

=1V;

VCC< 5.5 V

−−85 mA

recessive; V

1

=4V;

R8=47kΩ

−−10 mA

standby; note 1 −−275 µA

DC bus transmitter

V

IH

HIGH-level input voltage output recessive 0.7V

CC

− VCC+ 0.3 V

V

IL

LOW-level input voltage output dominant −0.3 − 0.3V

CC

V

I

IH

HIGH-level input current V1=4V −200 − +30 µA

I

IL

LOW-level input current V1=1V −100 −−600 µA

V

6, 7

recessive bus voltage V1= 4 V; no load 2.0 − 3.0 V

I

LO

off-state output leakage
current

−2V<(V6,V7)<7V −2 − +2 mA

−5V<(V

6,V7

) < 36 V −10 − +10 mA

V

7

CANH output voltage V1=1V; VCC= 4.75 to 5.5 V 3.0 − 4.5 V

V

1

=1V; VCC= 4.5 to 4.75 V 2.75 − 4.5 V

V

6

CANL output voltage V1=1V 0.5 − 2.0 V

∆V

6,7

difference between output
voltage at pins 6 and 7

V1=1V 1.5 − 3.0 V
V

1

=1V; RL=45Ω 1.5 −−V

V

1

= 4 V; no load −500 − +50 mV

I

sc7

short-circuit CANH current V7= −5V −−−200 mA

V

7

= −36 V −−100 − mA

I

sc6

short-circuit CANL current V6=36V −−200 mA
DC bus receiver [V1= 4 V; pins 6 and 7 externally driven; −2V<(V6,V7) < 7 V; unless otherwise specified]
V

diff(r)

differential input voltage

(recessive)

note 2 −1.0 − +0.5 V

−7V<(V

6,V7

) < 12 V; note 2 −1.0 − +0.4 V

V

diff(d)

differential input voltage

(dominant)

0.9 − 5.0 V

−7V<(V

6, V7

) < 12 V; not

standby mode

1.0 − 5.0 V

standby mode 0.97 − 5.0 V
standby mode;

V

CC

= 4.5 to 5.10 V

0.91 − 5.0 V

V

diff(hys)

differential input hysteresis see Fig.5 − 150 − mV