EM78P257AP datasheet(73/91 Pages) EMC

73 / 91 page

EM78P257

OTP ROM

This specification is subject to change without prior notice.

07.27.2004 (V1.4)

* Data in the Minimum, Typical, Maximum(“Min”,“Typ”,”Max”) column are based on characterization results

at 25

℃. This data is for design guidance and is tested.

6.2 AC Electrical Characteristic

(Ta=0~70

° C, VDD=5V± 5%, VSS=0V)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Dclk

Input CLK duty cycle

Tins

Instruction cycle time

(CLKS="0")

Crystal type

RC type

100

500

Ttcc

TCC input period

(Tins+20)/N*

Tdrh

Device reset hold time

Ta = 25

°C

10.78

15.4

20.2

Trst

/RESET pulse width

Ta = 25

°C

2000

Twdt1*

Watchdog timer period

Ta = 25

°C

10.78

15.4

20.2

Twdt2*

Watchdog timer period

Ta = 25

°C

0.75

1.07

1.39

Tset

Input pin setup time

Thold

Input pin hold time

Tdelay

Output pin delay time

Cload=20pF

* Twdt1: The Option word (SUT) is used to define the oscillator Set-Up time. WDT timeout length is the

same as set-up time(18ms).

* Twdt2: The Option word (SUT) is used to define the oscillator Set-Up time. WDT timeout length is the

same as set-up time(1ms).

* These parameters are characterizes but not tested.

* Data in the Minimum, Typical, Maximum(“Min”,“Typ”,”Max”) column are based on characterization

results at 25

℃. This data is for design guidance and is not tested.

* N= selected prescaler ratio.

* The duration of watch dog timer is determined by option code (bit5).

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