EM78P258N
8-Bit Microprocessor with OTP ROM
9 AC Electrical Characteristic
(Ta=25 °C, VDD=5V±5%, VSS=0V)
Symbol
Parameter
Conditions
Min
45
Typ
Max
55
Unit
%
Dclk
Input CLK duty cycle
50
Crystal type
RC type
100
DC
DC
ns
Instruction cycle time
(CLKS="0")
Tins
500
ns
Ttcc
TCC input period
(Tins+20)/N*
11.3
ns
Tdrh
Trst
Device reset hold time
/RESET pulse width
Watchdog timer period
Input pin setup time
Input pin hold time
Output pin delay time
ERC delay time
Ta = 25°C
Ta = 25°C
Ta = 25°C
16.2
21.6
21.6
ms
ns
2000
Twdt
Tset
11.3
16.2
0
ms
ns
Thold
Tdelay
Tdrc
15
45
1
20
50
3
25
55
5
ns
Cload=20pF
ns
Ta = 25°C
ns
NOTE: 1. N = selected prescaler ratio
2. Twdt1: The Option word1 (WDTPS) is used to define the oscillator set-up time. WDT timeout
length is the same as set-up time (18ms).
3. Twdt2: The Option word1 (WDTPS) is used to define the oscillator set-up time. WDT timeout
length is the same as set-up time (4.5ms).
4. These parameters are hypothetical (not tested) and are provided for design reference only.
5. Data under minimum, typical, & maximum (Min, Typ, & Max) columns are based on hypothetical
results at 25℃. These data are for design reference use only.
6. The Watchdog timer duration is determined by code option Word1 (WDTPS).
70 •
Product Specification (V1.0) 06.16.2005
(This specification is subject to change without further notice)
ELAN [ ELAN MICROELECTRONICS CORP ]
