SAB80C166W Datasheet, PDF (50/67 Pages) Siemens Semiconductor Group – C16x-Family of High-Performance CMOS 16-Bit Microcontrollers

SAB 80C166W/83C166W
AC Characteristics
External Clock Drive XTAL1
V_CC = 5 V ± 10 %; V_SS = 0 V
T_A = 0 to + 70 ˚C for SAB 83C166W-5M, SAB 80C166W/83C166W-M
T_A = – 40 to + 85 ˚C for SAB 83C166W-5M-T3, SAB 80C166W/83C166W-M-T3
T_A = – 40 to + 110 ˚C for SAB 83C166W-5M-T4, SAB 80C166W/83C166W-M-T4
Parameter
Oscillator period
High time
Low time
Rise time
Fall time
Oscillator duty cycle
Clock cycle
Symbol CPU Clock = 16 MHz Variable CPU Clock Unit
Duty cycle 0.4 to 0.6
1/T_CLP = 1 to 20 MHz
min.
max.
min.
max.
T_CLP SR 62.5
t_CLH SR 25
t_CLL SR 25
t_R SR –
t_F SR –
DC SR 0.4
T_CL
25
62.5
–
–
10
10
0.6
37.5
50
1000
ns
25
T_CLP-t_CLL
ns
25
T_CLP-t_CLH
ns
–
10
ns
–
10
ns
25 / T_CLP
1 - 25 / T_CLP
T_CLP x DC_min T_CLP x DC_max ns
Note: In order to run the SAB 80C166W/83C166W at a CPU clock of 20 MHz the duty cycle of the
oscillator clock must be 0.5, ie. the relation between the oscillator high and low phases must
be 1:1. So the variation of the duty cycle of the oscillator clock limits the maximum operating
speed of the device.
The 16 MHz values in the tables are given as an example for a typical duty cycle variation of
the oscillator clock from 0.4 to 0.6.
Figure 11
External Clock Drive XTAL1
Semiconductor Group
50