MAX3053_14 datasheet(10/12 Pages) MAXIM

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Additionally, a current-limiting circuit protects the trans-

mitter output stage against a short circuit to positive and

negative battery voltage. Although the power dissipation

increases during this fault condition, this feature prevents

destruction of the transmitter output stage.

Applications Information

Reduced EMI and Reflections

In slope control mode, the CANH, CANL outputs are

slew-rate limited, minimizing EMI and reducing reflections

caused by improperly terminated cables. In general, a

transmitter’s rise time relates directly to the length of an

unterminated stub, which can be driven with only minor

waveform reflections. The following equation expresses

this relationship conservatively:

Length = tRISE / (10 x 1.5ns/ft)

where tRISE is the transmitter’s rise time. See Figures 5,

6, and 7 for typical waveforms at various data rates.

The MAX3053 requires no special layout considerations

beyond common practices. Bypass VCC to GND with a

1μF ceramic capacitor mounted close to the IC with short

lead lengths and wide trace widths.

Figure 5. Output Bus in Slope Control Mode at 62.5kbps

Figure 7. Output Bus High-Speed Mode at 2Mbps

Figure 6. Output Bus in Slope Control Mode at 500kbps

CANH–CANL

5V/div

FFT

200mV/div

4.00µs

31.5kHz

RRS = 180kΩ

CANH–CANL

5V/div

FFT

200mV/div

100ns

1MHz

RRS = 0Ω

CANH–CANL

5V/div

FFT

200mV/div

400ns

250kHz

RRS = 24kΩ

CANH

CANL

SHDN

RXD

VCC

GND

TXD

TOP VIEW

MAX3053

±80V Fault-Protected, 2Mbps,

Low Supply Current CAN Transceiver

www.maximintegrated.com

Maxim Integrated │ 10

Chip Information

TRANSISTOR COUNT: 1214

PROCESS: BiCMOS

Pin Configuration

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