LC87F5LP6A Datasheet, PDF (25/28 Pages) Sanyo Semicon Device – CMOS IC FROM 256K byte, RAM 8192 byte on-chip 8-bit 1-chip Microcontroller

LC87F5LP6A
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
Frequency
Vendor
Name
Oscillator Name
Oscillation
Operating
Circuit Constant
Stabilization
Voltage
Time
Range
C1
C2
Rf1
Rd1
typ
max
[V]
[pF]
[pF]
[Ω]
[Ω]
[ms] [ms]
Remarks
12MHz
CSTCE12M0G52-R0 (10)
(10)
Open
470
4.5 to 5.5 0.05 0.15
Internal C1,C2
10MHz
CSTCE10M0G52-R0 (10)
CSTLS10M0G53-B0
(15)
(10)
Open
1.0k 4.5 to 5.5 0.05 0.15
(15)
Open
680
4.5 to 5.5 0.05 0.15
Internal C1,C2
Internal C1,C2
8MHz
MURATA CSTCE8M00G52-R0 (10)
CSTLS8M00G53-B0
(15)
(10)
Open
2.2k 3.0 to 5.5 0.05 0.15
(15)
Open
680
3.0 to 5.5 0.05 0.15
Internal C1,C2
Internal C1,C2
5MHz
CSTCR5M00G53-R0 (15)
CSTLS5M00G53-B0
(15)
(15)
Open
3.3k 2.5 to 5.5 0.05 0.15
(15)
Open
1.5k 2.5 to 5.5 0.05 0.15
Internal C1,C2
Internal C1,C2
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 Fig. 4).
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
Oscillation
Circuit Constant
Operating
Nominal
Vendor
Stabilization Time
Oscillator Name
Voltage Range
Frequency Name
C3
C4
Rf2
Rd2
typ
max
[V]
[pF]
[pF]
[Ω]
[Ω]
[s]
[s]
Remarks
32.768kHz
SEIKO
EPSON
MC-306
18
18
Open 560k
2.5 to 5.5
Applicable
1.3
3.0
CL 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 Fig. 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
CF2
Rf1
Rd1
C1
CF
C2
XT1
XT2
Rf2
Rd2
C3
C4
X’tal
Figure 1 Ceramic Oscillator Circuit
Figure 2 Crystal Oscillator Circuit
0.5VDD
Figure 3 AC Timing Measurement Point
No.A0664-25/28