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ST485ERBD

±15KV ESD PROTECTED, LOW POWER RS-485/RS-422 TRANSCEIVER

STMicroelectronics 

ST485ER

DRIVER SWITCHING CHARACTERISTICS

(VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C)

(See Note 1)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

tPLH Propagation Delay Input to RDIFF = 54Ω

CL1 = CL2 = 100pF

tPHL Output

(See Fig. 3 and 5)

10

30

60

ns

tSK Output Skew to Output

RDIFF = 54Ω

CL1 = CL2 = 100pF

5

10

ns

(See Fig. 3 and 5)

tTLH Rise or Fall Time

tTHL

RDIFF = 54Ω

CL1 = CL2 = 100pF

(See Fig. 3 and 5)

3

15

40

ns

tPZH Output Enable Time

CL = 100pF

S2 = Closed

(See Fig. 4 and 6)

70

90

ns

tPZL Output Enable Time

CL = 100pF

S1 = Closed

(See Fig. 4 and 6)

70

90

ns

tPLZ Output Disable Time

CL = 15pF

S1 = Closed

(See Fig. 4 and 6)

70

90

ns

tPHZ Output Disable Time

CL = 15pF

S2 = Closed

(See Fig. 4 and 6)

70

90

ns

CAB Output AB Capacitance

43

pF

Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground

unless specified.

RECEIVER SWITCHING CHARACTERISTICS

(VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C)

(See Note 1)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

tPLH

tPHL

tSKD

tPZH

tPZL

tPLZ

tPHZ

fMAX

Propagation Delay Input to

Output

Differential Receiver Skew

Output Enable Time

Output Enable Time

Output Disable Time

Output Disable Time

Maximum Data Rate

RDIFF = 54Ω

CL1 = CL2 = 100pF

(See Fig. 3 and 7)

RDIFF = 54Ω

CL1 = CL2 = 100pF

(See Fig. 3 and 7)

CRL = 15pF

S1 = Closed

(See Fig. 2 and 8)

CRL = 15pF

S2 = Closed

(See Fig. 2 and 8)

CRL = 15pF

S1 = Closed

(See Fig. 2 and 8)

CRL = 15pF

S2 = Closed

(See Fig. 2 and 8)

20

130 210

ns

13

20

20

20

20

2.5

ns

50

ns

50

ns

50

ns

50

ns

Mbps

Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground

unless specified.

4/13

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