SN75LBC970A

SCSI DIFFERENTIAL CONVERTER-CONTROL

SLLS215B – MAY 1995 – REVISED JANUARY 1999

11

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

Table 1. Output Test Enabling (No Clock Input)

SIGNAL

BUS

CONTROL INPUT(s)

INPUT(s)

OUTPUT

TEST

RSTFLTR

RESET

BBSY –

BBSY+

ABSY–

DSENS

ATN, ACK, MSG, C/D, REQ, I/O

A

B

H

H

L

ATN, ACK, MSG, C/D, REQ, I/O

B

A

H

L

L

RST

A

B

L—>H

H

L

H

H

RST

B

A

L—>H

H

L

H

H

SEL, BSY

B

A

L

H

L—>H

H

SEL, BSY

B

H

H

L

TIMEOUT

N/A

H

L

L

DRVBUS†

BBSY –/ BBSY+,

BSEL–/BSEL+,

TIMEOUT

DRVBUS

H

L

L

TIMEOUT

N/A

Z

H

L

† For these conditions, DRVBUS = BSEL or BBSY and TIMEOUT together.

Output

Input

TIMEOUT

15 pF

Input

Output

0 V

1.5 V

VCC

t0

t0

or

tP

tP

VOL

1.5 V

VOH

DRVBUS

tPHL

tPLH

RESET

TEST

DSENS,

BSEL, BBSY

RSTFLTR

TIMEOUT

DRVBUS

Figure 5. TIMEOUT to DRVBUS Delay Time Test Circuit and Timing Definitions