Z8F011ASH020EG2156 ZiLOG, Z8F011ASH020EG2156 Datasheet - Page 177

• Manufacturer Part Number: Z8F011ASH020EG2156
• Description: 8-bit Microcontrollers - MCU 1K FLASH 256B RAM 16B NVDS
• Manufacturer: ZiLOG

Specifications of Z8F011ASH020EG2156

• Rohs: yes
• Core: eZ8
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 20 MHz
• Program Memory Size: 1 KB
• Data Ram Size: 256 B
• On-chip Adc: No
• Package / Case: SOIC-20
• Mounting Style: SMD/SMT
• Interface Type: UART
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 17
• Number Of Timers: 2
• Program Memory Type: Flash
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

PS025113-1212
Oscillator Operation with an External RC Network
Figure 26. Connecting the On-Chip Oscillator to an External RC Network
Figure 26 displays a recommended configuration for connection with an external resistor-
capacitor (RC) network.
An external resistance value of 45 kΩ is recommended for oscillator operation with an
external RC network. The minimum resistance value to ensure operation is 40 kΩThe
typical oscillator frequency can be estimated from the values of the resistor (R in kΩ) and
capacitor (C in pF) elements using the following equation:
Oscillator Frequency (kHz)
Figure 27 displays the typical (3.3 V and 25°C) oscillator frequency as a function of the
capacitor (C in pF) employed in the RC network assuming a 45 kΩ external resistor. For
very small values of C, the parasitic capacitance of the oscillator X
circuit board should be included in the estimation of the oscillator frequency.
It is possible to operate the RC oscillator using only the parasitic capacitance of the pack-
age and printed circuit board. To minimize sensitivity to external parasitics, external
capacitance values in excess of 20 pF are recommended.
VDD
=
-------------------------------------------------------- -

0.4 R
R
C

1
Oscillator Operation with an External RC Network

10
C
X
IN

6
+

4 C


Z8 Encore!
Product Specification
IN
pin and the printed
®
F0830 Series
159