SN74BCT29854

8-BIT TO 9-BIT PARITY BUS TRANSCEIVER

SCBS257 – SEPTEMBER 1987 – REVISED NOVEMBER 1993

2–3

POST OFFICE BOX 655303

error-flag waveforms

Sample

Clear

Store

Pass

ERR

CLR

LE

Bi + PARITY

OEA

OEB

Even

H

Odd

L

H

L

H

L

H

L

H

L

ERROR-FLAG FUNCTION TABLE

INPUTS

INTERNAL

TO DEVICE

OUTPUT

PRESTATE

OUTPUT

FUNCTION

LE

CLR

POINT P

ERRn–1†

ERR

FUNCTION

L

L

L

H

X

L

H

Pass

L

H

L

X

H

X

L

H

L

L

H

Sample

H

L

X

X

H

Clear

H

H

X

L

H

L

H

Store

† ERRn–1 represents the state of the ERR output before any changes at CLR, LE,

or point P.

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage applied to a disabled I/O port

5.5 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range

0

°C to 70°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range

– 65

°C to 150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡ Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.