STLC5444 datasheet(7/17 Pages) STMICROELECTRONICS

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tAHAL

tADAL

tADAZ

tCLRL (Note 1)

tRHCH (Note 2)

tAZRL

tRLRH

tRHRL

tRLDA

tRHDZ

Read Data

DATA

ALE

D94TL108A

tADDA

Figure 1: Microprocessor Read Timing.

Notes:

1 - If tCLRL is negative, tRHRL,tRLRH,tAZRL, and tRLDA are measured from CS rather than RD.

2 - If tRHCH is negative, tRHRL,tRLRH and tRHDZ are measured from CS rather than RD.

When a read from the LER immediately follows a write to the LER a minimum of 1

µs is required between these operations.

tAHAL

tADAL

tADAZ

tCLWL (Note 1)

tWHCH (Note 2)

tWLWH

tWHWL

tDAWH

tWHDZ

Write Data

DATA

ALE

D94TL109A

INT

(Note 3)

tAZWL

Figure 2: Microprocessor Write Timing.

Notes:

1 - If tCLWL is negative tWHWL and tWLWH are measured from CS rather than WR.

2 - If tWHCH is negative, tWHWL,tWLWH,tDAWH and tWHDZ are measured from CS rather than WR.

The propagation delay from the writing of the T/I bit to the effect on the INT pin is approximately 1

µs for both mask and enable operations.

STLC5444

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