ADM4850 to ADM4857

Data Sheet

Rev. F | Page 4 of 16

ADM4850/ADM4854 TIMING SPECIFICATIONS

VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise noted.

Table 3.

Parameter

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

DRIVER

Maximum Data Rate

115

kbps

Propagation Delay

t

PLH, tPHL

600

2500

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Skew

t

SKEW

70

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Rise/Fall Times

t

R, tF

600

2400

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Enable Time

t

ZH, tZL

2000

ns

R

L = 500 Ω, CL = 100 pF, see Figure 22 and Figure 27 (ADM4850 only)

Disable Time

t

LZ, tHZ

2000

ns

R

L = 500 Ω, CL = 15 pF, see Figure 22 and Figure 27 (ADM4850 only)

Enable Time from Shutdown

4000

ns

R

L = 500 Ω, CL = 100 pF, see Figure 22 (ADM4850 only)

RECEIVER

Propagation Delay

t

PLH, tPHL

400

1000

ns

C

L = 15 pF, see Figure 23 and Figure 26

Differential Skew

t

SKEW

255

ns

C

L = 15 pF, see Figure 23 and Figure 26

Enable Time

t

ZH, tZL

5

50

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 28 (ADM4850 only)

Disable Time

t

LZ, tHZ

20

50

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 28 (ADM4850 only)

Enable Time from Shutdown

4000

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 (ADM4850 only)

Time to Shutdown

50

330

3000

ns

ADM4850 only1

1 The half-duplex device is put into shutdown mode by driving RE high and DE low. If these inputs are in this state for less than 50 ns, the device is guaranteed not to

enter shutdown mode. If the enable inputs are in this state for at least 3000 ns, the device is guaranteed to enter shutdown mode.

ADM4851/ADM4855 TIMING SPECIFICATIONS

VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise noted.

Table 4.

Parameter

Symbol

Min

Typ

Max

Unit

Test Conditions/Comments

DRIVER

Maximum Data Rate

500

kbps

Propagation Delay

t

PLH, tPHL

250

600

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Skew

t

SKEW

40

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Rise/Fall Times

t

R, tF

200

600

ns

R

LDIFF = 54 Ω, CL1 = CL2 = 100 pF, see Figure 21 and Figure 25

Enable Time

t

ZH, tZL

1000

ns

R

L = 500 Ω, CL = 100 pF, see Figure 22 and Figure 27 (ADM4851 only)

Disable Time

t

LZ, tHZ

1000

ns

R

L = 500 Ω, CL = 100 pF, see Figure 22 and Figure 27 (ADM4851 only)

Enable Time from Shutdown

4000

ns

R

L = 500 Ω, CL = 100 pF, see Figure 22 (ADM4851 only)

RECEIVER

Propagation Delay

t

PLH, tPHL

400

1000

ns

C

L = 15 pF, see Figure 23 and Figure 26

Differential Skew

t

SKEW

250

ns

C

L = 15 pF, see Figure 23 and Figure 26

Enable Time

t

ZH, tZL

5

50

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 28 (ADM4851 only)

Disable Time

t

LZ, tHZ

20

50

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 and Figure 28 (ADM4851 only)

Enable Time from Shutdown

4000

ns

R

L = 1 kΩ, CL = 15 pF, see Figure 24 (ADM4851 only)

Time to Shutdown

50

330

3000

ns

ADM4851 only1

1 The half-duplex device is put into shutdown mode by driving RE high and DE low. If these inputs are in this state for less than 50 ns, the device is guaranteed not to

enter shutdown mode. If the enable inputs are in this state for at least 3000 ns, the device is guaranteed to enter shutdown mode.