UPD70208H Datasheet, PDF (74/110 Pages) NEC – V40HLTM, V50HLTM 16/8, 16-BIT MICROPROCESSOR

µPD70208H, 70216H
RECOMMENDED OSCILLATOR
The clock input circuits (1) and (2) shown below are recommended.
(1) Ceramic resonator connection (TA = –40 to +85 °C, VDD = 5 V ±10% (µPD70208H, 70216H-10/12/16), VDD = 5 V ±5%
(µPD70208H, 70216H-20))
X1
X2
C1
C2
Cautions 1. The oscillator should be as close as possible to the X1 and X2 pins.
2. No other signal lines should pass through the area enclosed in dashed line.
3. For matching between V40HL, V50HL and resonator, the efficient evaluation should be carried
out.
4. The values of the oscillator constants C1 and C2 depend on the characteristics of the
resonator used. Evaluate them with the resonator actually used.
Manufacturer ^Frequency
(fXX) [MHz]
Product Name
Murata Mfg.
40
CSA40.00MXZ040
Co., Ltd.
32
CSA32.00MXZ040
25
CSA25.00MXZ040
20
CSA20.00MXZ040
TDK Corp.
32
FCR32.0M2G
25
FCR25.0M2G
20
FCR20.0M2G
Recommended
Constant
C1 [pF] C2 [pF]
3
3
5
5
5
5
10
10
5
5
5
5
10
10
(2) External clock input
X1
X2
or
High-speed
CMOS
Inverter
External Clock
X1
X2
Open
External Clock
High-speed
CMOS
Inverter
Caution The high-speed CMOS inverter should be as close as possible to the X1 and X2 pins.
74
Data Sheet U13225EJ4V0DS00