HEF4521B 查看數據表（PDF） - NXP Semiconductors.
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HEF4521B Datasheet PDF : 18 Pages
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NXP Semiconductors
RTC
C
VDD
RS
VDD
VDD1
A1
Y1
Y2
Q18
A2
HEF4521B
MR
VSS
Q24
VSS1
001aae714
f 2----.-3---------R--1--T---C----------C-- ; RS 2RTC , where:
f is in Hz, R is in , and C is in F.
RS
+
RTC
V----I--L-----m----a---x--
ILI
,
where:
Fig 8.
VIL(max) = maximum input voltage LOW; and
ILI = input leakage current.
RC oscillator circuit
HEF4521B
24-stage frequency divider and oscillator
102
fosc
(1)
(kHz)
10
(2)
1
001aae715
10−1
1
10
10−1
1
102 RTC (kΩ) 103
10 C (nF) 102
VDD = 10 V; The test circuit is shown in Figure 8.
(1) RTC; C = 1 nF; RS 2 RTC.
(2) C; RTC = 56 k; RS = 120 k.
Fig 9. Oscillator frequency as a function of
RTC and C
HEF4521B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 21 November 2011
© NXP B.V. 2011. All rights reserved.
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