ST485AB datasheet(7/19 Pages) STMICROELECTRONICS

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ST485AB

Electrical characteristics

7/19

Table 9.

Receiver electrical characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85°C, unless

otherwise specified. Typical values are referred to TA = 25°C, VCC = 5 V) (Note: 1)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VTH

Receiver Differential Threshold

Voltage

VCM = -7 V to 12 V

-0.2

0.2

ΔVTH

Receiver Input Hysteresis

VCM = 0 V

VOH

Receiver Output High Voltage

IOUT = -4 mA, VID = 200 mV

3.5

4.7

VOL

Receiver Output Low Voltage

IOUT = 4 mA, VID = -200 mV

0.2

0.4

IOZR

3-State (High Impedance) Output

Current at Receiver

VO = 0.4 V to 2.4 V

± 1

μA

RRIN

Receiver Input Resistance

VCM = -7 V to 12 V

IOSR

Receiver Short-Circuit Current

VO = 0 V to VCC

795

Table 10.

Driver switching characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85°C, unless otherwise

specified. Typical values are referred to TA = 25°C, VCC = 5 V) (See Note: 1, Note 3)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Maximum data rate

Jitter < 5%

Mbps

tPLH

tPHL

Propagation delay input to output

RL= 54 Ω, CL1=CL2=50 pF,

(Figure 8.)

tSKEW

Differential output delay skew

RL= 54Ω, CL1=CL2=50 pF,

(Figure 6.)

0.5

tTLH

tTHL

Rise or fall differential time

RL= 54Ω, CL1=CL2=50 pF,

(Figure 6.)

812

tPZL

Output enable time

CL= 50 pF, S1 Closed

tPZH

Output enable time

CL= 50 pF, S2 Closed

tPHZ

Output disable time

CL= 15 pF, S2 Closed

tPLZ

Output disable time

CL= 15 pF, S1 Closed

tSK(EN)

Synchronous driver operation a-b at

enable

2ns

tSK(DS)

Synchronous driver operation A-B

at disable

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