LC87F5G32A Datasheet, PDF (20/23 Pages) Sanyo Semicon Device – FROM 32K byte, RAM 1024 byte on-chip 8-bit 1-chip Microcontroller

LC87F5G32A
Characteristics of a Sample Main System Clock Oscillation Circuit
Given below are the characteristics of a sample main system clock oscillation circuit that are measured using a
SANYO-designated oscillation characteristics evaluation board and external components with circuit constant values
with which the oscillator vendor confirmed normal and stable oscillation.
Table 1 Characteristics of a Sample Main System Clock Oscillator Circuit with a Ceramic Oscillator
Nominal
Vendor Name
Frequency
Oscillator Name
Circuit Constant
C1
C2
Rf
Rd1
[pF] [pF] [Ω]
[Ω]
Operating
Voltage
Range
[V]
Oscillation Stabilization
Time
typ
max
[ms]
[ms]
Remarks
CSTCE10M0G52-R0 (10) (10) Open 680
4.0 to 5.5
0.1
10MHz
MURATA
CSTCE10M0G52-B0 (10) (10) Open 680
4.0 to 5.5
0.1
0.5
Internal C1, C2
0.5
(SMD type)
8MHz
CSTCE8M00G52-R0 (10) (10) Open 1.0k
3.0 to 5.5
0.1
MURATA
CSTCE8M00G52-B0 (10) (10) Open 1.0k 3.0 to 5.5
0.1
0.5
Internal C1, C2
0.5
(SMD type)
5MHz
CSTCR5M00G53-R0 (15) (15) Open 2.2k
2.5 to 5.5
0.2
MURATA
CSTCR5M00G53-B0 (15) (15) Open 2.2k
2.5 to 5.5
0.2
0.6
Internal C1, C2
0.6
(SMD type)
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after VDD
goes above the operating voltage lower limit (see Figure 4).
It is recommended to insert feedback resister(Rf:1MΩ) when power supply voltage is used around 2.5V.
Characteristics of a Sample Subsystem Clock Oscillator Circuit
Given below are the characteristics of a sample subsystem clock oscillation circuit that are measured using a SANYO-
designated oscillation characteristics evaluation board and external components with circuit constant values with which
the oscillator vendor confirmed normal and stable oscillation.
Table 2 Characteristics of a Sample Subsystem Clock Oscillator Circuit with a Crystal Oscillator
Nominal
Frequency
Operating Oscillation Stabilization
Circuit Constant
Voltage
Time
Vendor Name Oscillator Name
Remarks
C3
C4
Rf
Rd2
Range
typ
max
[pF] [pF]
[Ω]
[Ω]
[V]
[s]
[s]
32.768kHz
EPSON
TOYOCOM
MC-306
18
18 Open 510k 2.5 to 5.5
1.1
Applicable CL
3.0
value=12.5pF
The oscillation stabilization time refers to the time interval that is required for the oscillation to get stabilized after the
instruction for starting the subclock oscillation circuit is executed and to the time interval that is required for the
oscillation to get stabilized after the HOLD mode is reset (see Figure 4).
Note: The components that are involved in oscillation should be placed as close to the IC and to one another as possible
because they are vulnerable to the influences of the circuit pattern.
CF1
C1
CF2
Rf
Rd1
C2
CF
Figure 1 CF Oscillator Circuit
XT1
XT2
Rf
Rd2
C3
C4
X’tal
Figure 2 XT Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.8298-20/23