MAX14770E(2010) Просмотр технического описания (PDF) - Maxim Integrated

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MAX14770E
(Rev.:2010)

High-ESD Profibus RS-485 Transceiver

Maxim Integrated 

High-ESD Profibus RS-485 Transceiver

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +5V Q10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25NC.) (Note 2)

PARAMETER

Maximum Data Rate

Receiver Enable to

Output High

Receiver Enable to

Output Low

Receiver Disable

Time from Low

Receiver Disable

Time from High

SYMBOL

CONDITIONS

tRZH

tRZL

tRLZ

tRHZ

S2 closed; RL = 1kI, CL = 15pF; Figure 10

S1 closed; RL = 1kI, CL = 15pF; Figure 10

S1 closed; RL = 1kI, CL = 15pF; Figure 10

S2 closed; RL = 1kI, CL = 15pF; Figure 10

MIN TYP MAX UNITS

20

Mbps

30

ns

30

ns

30

ns

30

ns

Receiver Enable from

Shutdown to Output

High

tRZL(SHDN)

S1 closed; RL = 1kI, CL = 15pF; Figure 10

(Notes 6, 7)

100

Fs

Receiver Enable from

Shutdown to Output

Low

tRZH(SHDN)

S2 closed; RL = 1kI, CL = 15pF; Figure 10

(Notes 6, 7)

Time to Shutdown

tSHDN

(Note 6)

50

100

Fs

800

ns

Note 2: Devices are production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design.

Note 3: VODPP is the difference in VOD, with the DI at high and DI at low.

Note 4: DVOD and DVOC are the changes in |VOD| and |VOC|, respectively, with the DI at high and DI at low.

Note 5: The short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback out-

put current applies during current limiting to allow a recovery from bus contention.

Note 6: Shutdown is enabled by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the device

is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 800ns, the device is guaranteed to

have entered shutdown.

Note 7: Capacitive load includes test probe and fixture capacitance.

Note 8: Guaranteed by characterization, not production tested.

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