HEF4521BPB 查看數據表（PDF） - Philips Electronics
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HEF4521BPB Datasheet PDF : 11 Pages
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Philips Semiconductors
24-stage frequency divider and oscillator
Product specification
HEF4521B
MSI
Fig.4 Schematic diagram of clock input circuitry.
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP.
MAX.
Propagation delays
I2 → O18
HIGH to LOW
LOW to HIGH
On → On + 1
HIGH to LOW
LOW to HIGH
MR → On
HIGH to LOW
I1 → O1
HIGH to LOW
LOW to HIGH
5
10 tPHL
15
5
10 tPLH
15
5
10 tPHL
15
5
10 tPLH
15
5
10 tPHL
15
5
10 tPHL
15
5
10 tPLH
15
950 1900 ns
350 700 ns
220 440 ns
950 1900 ns
350 700 ns
220 440 ns
40 80 ns
15 30 ns
10 20 ns
40 80 ns
15 30 ns
10 20 ns
120 240 ns
55 110 ns
40 80 ns
90 180 ns
35 70 ns
25 50 ns
60 120 ns
30 60 ns
20 40 ns
TYPICAL
EXTRAPOLATION
FORMULA
923 ns + (0,55 ns/pF) CL
339 ns + (0,23 ns/pF) CL
212 ns + (0,16 ns/pF) CL
923 ns + (0,55 ns/pF) CL
339 ns + (0,23 ns/pF) CL
212 ns + (0,16 ns/pF) CL
13 ns + (0,55 ns/pF) CL
4 ns + (0,23 ns/pF) CL
2 ns + (0,16 ns/pF) CL
13 ns + (0,55 ns/pF) CL
4 ns + (0,23 ns/pF) CL
2 ns + (0,16 ns/pF) CL
93 ns + (0,55 ns/pF) CL
44 ns + (0,23 ns/pF) CL
32 ns + (0,16 ns/pF) CL
63 ns + (0,55 ns/pF) CL
24 ns + (0,23 ns/pF) CL
17 ns + (0,16 ns/pF) CL
33 ns + (0,55 ns/pF) CL
19 ns + (0,23 ns/pF) CL
12 ns + (0,16 ns/pF) CL
January 1995
5
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