DS2155 datasheet(224/238 Pages) DALLAS

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DS2155

224 of 238

37.

AC TIMING PARAMETERS AND DIAGRAMS

Capacitive test loads are 40pF for bus signals, 20pF for all others.

37.1 Multiplexed Bus AC Characteristics

AC CHARACTERISTICS: MULTIPLEXED PARALLEL PORT (MUX = 1)

(Figure 37-1, Figure 37-2, and Figure 37-3)

(VDD = 3.3V ±5%, TA = 0°C to +70°C for DS2155L; VDD = 3.3V ±5%, TA = -40°C to +85°C for DS2155LN.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Cycle Time

tCYC

200

Pulse Width, DS Low or RD High

PWEL

100

Pulse Width, DS High or RD Low

PWEH

100

Input Rise/Fall Times

tR, tF

R/W Hold Time

tRWH

R/W Setup Time Before DS High

tRWS

CS Setup Time Before DS, WR, or RD

Active

tCS

CS Hold Time

tCH

Read Data Hold Time

tDHR

Write Data Hold Time

tDHW

Muxed Address Valid to AS or ALE Fall

tASL

Muxed Address Hold Time

tAHL

Delay Time DS, WR, or RD to AS or ALE

Rise

tASD

Pulse Width AS or ALE High

PWASH

Delay Time, AS or ALE to DS, WR or RD

tASED

Output Data Delay Time from DS or RD

tDDR

Data Setup Time

tDSW

DS2155 Datasheet(PDF) 224 Page - Dallas Semiconductor

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