Philips Semiconductors

Product specification

SCN26562

Dual universal serial communications controller (DUSCC)

1995 May 1

7

AC ELECTRICAL CHARACTERISTICS (Continued)

A6–A1

tADVRDL

CEN

tCEHCEL

tCELRDL

RDN

tRDHCEH

tRDLADI

tRDLRDH

tRDHRDL

D0–D7

tRDLDDV

tRDHDDF

tRDHDDI

RDYN

tRDLRYL

tRYZDDV

1

NOTES:

1.

Wait on Rx. Receiver FIFO empty.

2.

Timing is illustrated and referenced to the WRN and RDN inputs. The device may also be operated with CEN as the ‘strobing’ input. CEN and RDN

(also CEN and WRN) are ANDed internally. As a consequence, the signal asserted last initiates the cycle and the signal negated first terminates the

cycle.

SD00206

Figure 4. Read Cycle

SYMBOL

PARAMETER

LIMITS

UNIT

SYMBOL

PARAMETER

SCN26562C4

SCN26562C2

UNIT

Min

Max

Min

Max

Address valid to RDN low

CEN low to RDN low

RDN low to address invalid

RDN low to RDYN low

RDN low to read data valid

RDN low to RDN high

RDYN high impedance to read data valid

RDN high to CEN high

CEN high to CEN low

RDN high to read data invalid

RDN high to RDN low

RDN high to data bus floating

10

0

150

300

0

160

10

160

275

280

100

75

10

0

150

310

0

170

10

170

275

300

100

75

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns

ns