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參數(shù)資料
| 型號： | 933559880652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 計(jì)數(shù)器 |
| 英文描述： | 4000/14000/40000 SERIES, ASYN NEGATIVE EDGE TRIGGERED 14-BIT UP BINARY COUNTER, PDIP16 |
| 封裝： | PLASTIC, SOT-38-1, DIP-16 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 109K |
| 代理商： | 933559880652 |
January 1995
6
Philips Semiconductors
Product specication
14-stage ripple-carry binary counter/divider
and oscillator
HEF4060B
MSI
Timing component limitations
The oscillator frequency is mainly determined by
RtCt, provided Rt << R2 and R2C2 << RtCt. The function
of R2 is to minimize the influence of the forward voltage
across the input protection diodes on the frequency. The
stray capacitance C2 should be kept as small as possible.
In consideration of accuracy, Ct must be larger than the
inherent stray capacitance. Rt must be larger than the
LOCMOS ‘ON’ resistance in series with it, which typically
is 500
at VDD = 5 V, 300 at VDD = 10 V and 200 at
VDD = 15 V.
The recommended values for these components to
maintain agreement with the typical oscillation formula are:
Ct ≥ 100 pF, up to any practical value,
10 k
≤ Rt ≤ 1 M.
Typical crystal oscillator circuit
In Fig.5, R2 is the power limiting resistor. For starting and
maintaining oscillation a minimum transconductance is
necessary.
Fig.5
External component connection for crystal
oscillator.
Fig.6
Test set-up for measuring forward transconductance gfs =dio/dvi at vo is constant (see also graph Fig.7);
MR = LOW.
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