UM491 datasheet(5/17 Pages) UNIONSEMI

Part #	UM491

Description	짹15kV ESD-Protected, Fail-Safe, Slew-Rate-Limited RS-422

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Manufacturer	UNIONSEMI [Union Semiconductor, Inc.]

Direct Link	http://www.union-ic.com

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5 / 17 page

________________________________________________________________________

http://www.union-ic.com

Rev.04 Aug.2013

5/17

UM488/UM491

Switching Characteristics

(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V

and TA = +25°C.)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

Driver Input-to-Output

t

DPLH

Figures 5 and 7, R

DIFF = 54Ω,

C

L1 = CL2 = 100pF

10

30

60

ns

t

DPHL

10

30

60

Driver Output Skew

| tDPLH - tDPHL |

tDSKEW

Figures 5 and 7, R

DIFF = 54Ω,

C

L1 = CL2 = 100pF

5

10

ns

Driver Rise or Fall Time

t

DR, tDF

Figures 5 and 7, R

DIFF = 54Ω,

C

L1 = CL2 = 100pF

5

15

25

ns

Maximum Data Rate

f

MAX

2.5

Mbps

Driver Enable to Output High

t

DZH

Figures 6 and 8, C

L = 100pF,

S2 closed

40

70

ns

Driver Enable to Output Low

t

DZL

Figures 6 and 8, C

L = 100pF,

S1 closed

40

70

ns

Driver Disable Time from

Low

t

DLZ

Figures 6 and 8, C

L = 15pF,

S1 closed

40

70

ns

Driver Disable Time from

High

t

DHZ

Figures 6 and 8, C

L = 15pF,

S2 closed

40

70

ns

Receiver Input to Output

t

RPLH,

t

RPHL

Figures 9 and 11; | VID | ≥2.0V;

rise and fall time of V

ID≤15ns

20

90

150

ns

| tRPLH - tRPHL | Differential

Receiver Skew

t

RSKD

Figures 9 and 11; | VID | ≥2.0V;

rise and fall time of V

ID≤15ns

13

ns

Receiver Enable to Output

Low

t

RZL

Figures 4 and 10, C

L = 100pF,

S1 closed

20

50

ns

Receiver Enable to Output

High

t

RZH

Figures 4 and 10, C

L = 100pF,

S2 closed

20

50

ns

Receiver Disable Time from

Low

t

RLZ

Figures 4 and 10, C

L = 100pF,

S1 closed

20

50

ns

Receiver Disable Time from

High

t

RHZ

Figures 4 and 10, C

L = 100pF,

S2 closed

20

50

ns

Time to Shutdown

t

SHDN

(Note 4)

50

200

600

ns

Driver Enable from

Shutdown to Output High

t

DZH(SHDN

)

Figures 6 and 8, C

L = 15pF,

S2 closed

40

100

ns

Driver Enable from

Shutdown to Output Low

t

DZL(SHDN)

Figures 6 and 8, C

L = 15pF,

S1 closed

40

100

ns

Receiver Enable from

Shutdown- to-Output High

t

RZH(SHDN)

Figures 4 and 10, C

L = 100pF,

S2 closed

300

1000

ns

Receiver Enable from

Shutdown- to-Output Low

t

RZL(SHDN)

Figures 4 and 10, C

L = 100pF,

S1 closed

300

1000

ns

Note 4:

The device is put into shutdown 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 600ns, the device is guaranteed to have entered shutdown.

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