HEF4541B データシートの表示（PDF） - Philips Electronics
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HEF4541B Datasheet PDF : 8 Pages
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Philips Semiconductors
Programmable timer
Product specification
HEF4541B
MSI
AC CHARACTERISTICS
VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns
VDD
V
SYMBOL MIN. TYP. MAX.
Propagation delays
RS → O
28 selected
HIGH to LOW
LOW to HIGH
RS → O
210 selected
HIGH to LOW
LOW to HIGH
RS → O
213 selected
HIGH to LOW
LOW to HIGH
RS → O
216 selected
HIGH to LOW
LOW to HIGH
Minimum clock
pulse width; LOW
Minimum reset
pulse width; HIGH
Maximum clock
pulse frequency
Oscillator frequency
Oscillator frequency
5
10
tPHL;
tPLH
15
5
10
tPHL;
tPLH
15
5
10
tPHL;
tPLH
15
5
10
tPHL;
tPLH
15
5
10 tWRSL
15
5
10 tWMRH
15
5
10 fmax
15
5
10 fosc
15
5
10 fosc
15
375 750 ns
150 300 ns
110 220 ns
425 850 ns
165 330 ns
120 240 ns
510 1020 ns
190 380 ns
135 270 ns
575 1150 ns
210 420 ns
150 300 ns
60
30
ns
30
15
ns
24
12
ns
60
30
ns
30
15
ns
24
12
ns
8
16
MHz
15
30
MHz
18
36
MHz
90
kHz
90
kHz
90
kHz
8
kHz
8
kHz
8
kHz
TYPICAL EXTRAPOLATION
FORMULA
348 ns + (0,55 ns/pF) CL
139 ns + (0,23 ns/pF) CL
102 ns + (0,16 ns/pF) CL
398 ns + (0,55 ns/pF) CL
154 ns + (0,23 ns/pF) CL
112 ns + (0,16 ns/pF) CL
483 ns + (0,55 ns/pF) CL
179 ns + (0,23 ns/pF) CL
127 ns + (0,16 ns/pF) CL
548 ns + (0,55 ns/pF) CL
199 ns + (0,23 ns/pF) CL
142 ns + (0,16 ns/pF) CL
Rt = 5 kΩ
Ct = 1 nF
RS = 10 kΩ
Rt = 56 kΩ
Ct = 1 nF
RS = 120 kΩ
January 1995
8
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