ST485ECN datasheet(7/19 Pages) STMICROELECTRONICS

7 / 19 page

ST485E

Electrical characteristics

7/19

IOSD2

Driver short-circuit current,

VO=Low

VO = -7 to 12V

(3)

250

IOSR

Receiver short-circuit current VO = 0V to VCC

795

All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground

unless specified.

Supply current specification is valid for loaded transmitters when VDE = 0V

Applies to peak current. See typical Operating Characteristics.

Table 6.

DC Electrical characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise

specified. Typical values are referred to TA = 25°C)

Symbol

Parameter

Test conditions (1)

Min.

Typ.

Max.

Unit

Table 7.

Driver switching characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise

specified. Typical values are referred to TA = 25°C)

Symbol

Parameter

Test conditions (1)

Min.

Typ.

Max.

Unit

tPLH

tPHL

Propagation delay input to

output

RDIFF = 54ΩCL1 = CL2 = 100pF

(See

Figure 4. and Figure 6.)

tSK

Output skew to output

RDIFF = 54ΩCL1 = CL2 = 100pF

(See

Figure 4. and Figure 6.)

tTLH

tTHL

Rise or fall time

RDIFF = 54Ω, CL1 = CL2 = 100pF (See

Figure 4. and Figure 6.)

tPZH

Output enable time

CL = 100pF, S2 = Closed

(See

Figure 5. and Figure 7.)

tPZL

Output enable time

CL = 100pF, S1 = Closed

(See

Figure 5. and Figure 7.)

tPLZ

Output disable time

CL = 15pF, S1 = Closed

(See

Figure 5. and Figure 7.)

tPHZ

Output disable time

CL = 15pF, S2 = Closed

(See

Figure 5. and Figure 7.)

All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground

unless specified.

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