SN75ALS056, SN75ALS057

TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS

SLLS028G – AUGUST 1987 – REVISED JUNE 1998

9

POST OFFICE BOX 655303

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TEST CONDITIONS

SN75ALS057

DRIVER

UNIT

(INPUT)

(OUTPUT)

MIN

TYP†

MAX

tPLH1

Propagation delay time,

low-to-high-level output

TE

Bn

Dn, En, RE at 2 V, VL = 2 V,

RL2 not connected RL118 Ω

24

ns

tPHL1

Propagation delay time,

high-to-low-level output

TE

Bn

RL2 not connected, RL1 = 18 Ω,

See Figure 2, CL = 30 pF

20

ns

tPLH2

Propagation delay time,

low-to-high-level output

Dn or En

Bn

TE at 0.8 V, RE at 2 V,

VL = 2 V, RL1 = 18 Ω,

19

ns

tPHL2

Propagation delay time,

high-to-low-level output

Dn or En

Bn

VL 2 V, RL1 18 Ω,

RL2 not connected,CL = 30 pF,

See Figure 2

18

ns

tTLH

Transition time,

low-to-high-level output

Dn or En

Bn

RE at 2 V, VL = 2 V,

TE at 0.8 V, RL1 = 18 Ω,,

1

3

11

ns

tTHL

Transition time,

high-to-low-level output

Dn or En

Bn

,

L

,,

RL2 not connected, CL = 30 pF,

See Figure 2

1

3

6

ns

† Typical values are at VCC = 5 V, TA = 25°C.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (continued)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

TEST CONDITIONS

SN75ALS057

RECEIVER

UNIT

(INPUT)

(OUTPUT)

MIN

MAX

tPLH4

Propagation delay time,

low-to-high-level output

Bn

Rn

RE at 0.8 V, TE at 2 V, VL = 5 V,

RL1 390 Ω RL21 6 kΩ CL 30 pF

18

ns

tPHL4

Propagation delay time,

high-to-low-level output

Bn

Rn

RL1 = 390 Ω,, RL2 = 1.6 kΩ,, CL = 30 pF,

See Figure 4

18

ns

tPLZ2

Output disable time

from low level

RE

Rn

Bn at 2 V, TE at 2 V, VL = 5 V,

CL = 5 pF, RL1 = 390 Ω,

RL2 not connected, See Figure 5

18

ns

tPZL2

Output enable time to

low level

RE

Rn

Bn at 2 V, TE at 2 V, VL = 5 V,

CL = 30 pF, RL1 = 390 Ω, RL2 = 1.6 kΩ,

See Figure 5

15

ns

tPHZ2

Output disable time

from high level

RE

Rn

Bn at 0.8 V, TE at 2 V, VL = 0,

CL = 5 pF, RL1 = 390 Ω,

RL2 not connected, See Figure 5

17

ns

tPZH2

Output enable time to

high level

RE

Rn

Bn at 0.8 V, TE at 2 V, VL = 0,

CL = 30 pF, RL1 not connected,

RL2 = 1.6 kΩ, See Figure 5

17

ns

tw(NR)

Receiver noise

rejection pulse duration

Bn

Rn

TE at 2 V, RE at 0.8 V, VL = 0,

RL1 = 390 Ω, RL2 = 1.6 kΩ, CL = 30 pF,

See Figure 6

3

ns