em78p257 ELAN Microelectronics Corp, em78p257 Datasheet - Page 73

• Manufacturer Part Number: em78p257
• Description: 8-bit Microcontroller
• Manufacturer: ELAN Microelectronics Corp

6.2 AC Electrical Characteristic
(Ta=0~70 C, VDD=5V 5%, VSS=0V)
This specification is subject to change without prior notice.
Symbol
* Data in the Minimum, Typical, Maximum(“Min”,“Typ”,”Max”) column are based on characterization results
Twdt1*
Twdt2*
Tdelay
Thold
Dclk
Tins
Tdrh
Tset
Ttcc
at 25¢J. This data is for design guidance and is tested.
Trst
* These parameters are characterizes but not tested.
* Data in the Minimum, Typical, Maximum(“Min”,“Typ”,”Max”) column are based on characterization
* N= selected prescaler ratio.
* The duration of watch dog timer is determined by option code (bit5).
* Twdt1: The Option word (SUT) is used to define the oscillator Set-Up time. WDT timeout length is the
* Twdt2: The Option word (SUT) is used to define the oscillator Set-Up time. WDT timeout length is the
results at 25¢J. This data is for design guidance and is not tested.
same as set-up time(18ms).
same as set-up time(1ms).
Watchdog timer period
Watchdog timer period
Device reset hold time
Output pin delay time
Instruction cycle time
Input CLK duty cycle
/RESET pulse width
Input pin setup time
Input pin hold time
TCC input period
(CLKS="0")
Parameter
Cload=20pF
Crystal type
Conditions
Ta = 25 C
Ta = 25 C
Ta = 25 C
Ta = 25 C
RC type
73
(Tins+20)/N*
10.78
10.78
2000
0.75
100
500
Min
45
15.4
15.4
1.07
Typ
50
20
50
0
EM78P257
20.2
20.2
1.39
Max
DC
DC
55
07.27.2004 (V1.4)
OTP ROM
Unit
ms
ms
ms
ms
ms
ms
ns
ns
ns
ns
%