PIC17LC752-08/PSQTP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC17LC752-08/PSQTP

High-Performance 8-Bit CMOS EPROM Microcontrollers

Microchip Technology 

PIC17C75X

FIGURE 20-19: MEMORY INTERFACE READ TIMING

Q1

Q2

Q3

Q4

Q1

OSC1

ALE

OE

AD<15:0>

'1'

WR

166

164

168

160

165

Addr out

150

151

167

Data in

162

163

Q2

161

Addr out

'1'

TABLE 20-20: MEMORY INTERFACE READ REQUIREMENTS

Param.

No. Sym

Characteristic

Min

Typ†

Max

Units Conditions

150 TadV2alL AD15:AD0 (address) valid to PIC17CXXX 0.25Tcy - 10

—

ALE↓ (address setup time) PIC17LCXXX

TBD

—

151 TalL2adI ALE↓ to address out invalid PIC17CXXX

5*

—

(address hold time)

PIC17LCXXX

TBD

—

—

ns

—

—

ns

—

160 TadZ2oeL AD15:AD0 hi-impedance to PIC17CXXX

0*

—

OE↓

PIC17LCXXX

TBD

—

—

ns

—

161 ToeH2adD OE↑ to AD15:AD0 driven

PIC17CXXX 0.25Tcy - 15

—

PIC17LCXXX

TBD

—

—

ns

—

162 TadV2oeH Data in valid before OE↑

PIC17CXXX

35

—

(data setup time)

PIC17LCXXX

TBD

—

—

ns

—

163 ToeH2adI OE↑to data in invalid

164 TalH

(data hold time)

ALE pulse width

PIC17CXXX

0

—

PIC17LCXXX

TBD

—

—

ns

—

PIC17CXXX

—

0.25TCY §

—

ns

PIC17LCXXX

—

TBD

—

165 ToeL

OE pulse width

166 TalH2alH ALE↑ to ALE↑(cycle time)

167 Tacc

Address access time

PIC17CXXX 0.5Tcy - 35 §

PIC17LCXXX

PIC17CXXX

PIC17LCXXX

PIC17CXXX

PIC17LCXXX

TBD

—

—

—

—

—

—

TCY §

TBD

—

—

—

ns

—

—

ns

—

0.75TCY - 30

ns

TBD

168 Toe

Output enable access time PIC17CXXX

—

(OE low to Data Valid)

PIC17LCXXX

—

—

0.5TCY - 45

ns

—

TBD

*

These parameters are characterized but not tested.

†

Data in “Typ” column is at 5V, 25°C unless otherwise stated. These parameters are for design guidance only and are not

tested.

§

This specification ensured by design.

DS30264A-page 248

Preliminary

© 1997 Microchip Technology Inc.

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