PSD4235G2 datasheet(72/93 Pages) STMICROELECTRONICS

72 / 93 page

Preliminary Information

PSD4000 Series

NOTES: 1. RD timing has the same timing as DS, LDS, UDS, and PSEN signals.

2. RD and PSEN have the same timing.

3. Any input used to select an internal PSD4000 function.

4. In multiplexed mode, latched addresses generated from ADIO delay to address output on any Port.

5. RD timing has the same timing as DS, LDS, and UDS signals.

-70

-90

Turbo

Symbol

Parameter

Conditions

Min

Max

Min

Max

Off

Unit

tLVLX

ALE or AS Pulse Width

tAVLX

Address Setup Time

(Note 3)

tLXAX

Address Hold Time

(Note 3)

tAVQV

Address Valid to Data Valid

(Note 3)

Add 12**

t SLQV

CS Valid to Data Valid

100

RD to Data Valid

(Note 5)

t RLQV

RD or PSEN to Data Valid,

80C51XA Mode

(Note 2)

t RHQX

RD Data Hold Time

(Note 1)

tRLRH

RD Pulse Width

(Note 1)

tRHQZ

RD to Data High-Z

(Note 1)

tEHEL

E Pulse Width

tTHEH

R/W Setup Time to Enable

tELTL

R/W Hold Time After Enable

tAVPV

Address Input Valid to Address

(Note 4)

Output Delay

Read Timing (5 V ± 10% Versions)

Microcontroller Interface – PSD4000 AC/DC Parameters

(5V ± 10% Versions)

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