PIC17C44T-16I/P View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC17C44T-16I/P

High-Performance 8-Bit CMOS EPROM/ROM Microcontroller

Microchip Technology 

PIC17C4X

Applicable Devices 42 R42 42A 43 R43 44

FIGURE 17-11: MEMORY INTERFACE WRITE TIMING

Q1

Q2

Q3

Q4

Q1

Q2

OSC1

ALE

OE

WR

AD<15:0>

150

addr out

151

152

154

data out

153

addr out

TABLE 17-11: MEMORY INTERFACE WRITE REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max Units Conditions

150

TadV2alL AD<15:0> (address) valid to ALE↓

0.25Tcy - 30

—

(address setup time)

151

TalL2adI ALE↓ to address out invalid

(address hold time)

0

—

— ns

— ns

152

TadV2wrL Data out valid to WR↓

(data setup time)

0.25Tcy - 40

—

— ns

153

TwrH2adI WR↑ to data out invalid

(data hold time)

—

0.25TCY § —

ns

154

TwrL

WR pulse width

—

0.25TCY § —

ns

*

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 is guaranteed by design.

© 1996 Microchip Technology Inc.

DS30412C-page 161

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