Datasheet

January 1995 8
Philips Semiconductors Product specification
Programmable timer
HEF4541B
MSI
AC CHARACTERISTICS
V
SS
= 0 V; T
amb
=25°C; C
L
= 50 pF; input transition times ≤ 20 ns
V
DD
V
SYMBOL MIN. TYP. MAX.
TYPICAL EXTRAPOLATION
FORMULA
Propagation delays
RS → O
2
8
selected 5
t
PHL
;
t
PLH
375 750 ns 348 ns + (0,55 ns/pF) C
L
HIGH to LOW
LOW to HIGH
10 150 300 ns 139 ns + (0,23 ns/pF) C
L
15 110 220 ns 102 ns + (0,16 ns/pF) C
L
RS → O
2
10
selected 5
t
PHL
;
t
PLH
425 850 ns 398 ns + (0,55 ns/pF) C
L
HIGH to LOW
LOW to HIGH
10 165 330 ns 154 ns + (0,23 ns/pF) C
L
15 120 240 ns 112 ns + (0,16 ns/pF) C
L
RS → O
2
13
selected 5
t
PHL
;
t
PLH
510 1020 ns 483 ns + (0,55 ns/pF) C
L
HIGH to LOW
LOW to HIGH
10 190 380 ns 179 ns + (0,23 ns/pF) C
L
15 135 270 ns 127 ns + (0,16 ns/pF) C
L
RS → O
2
16
selected 5
t
PHL
;
t
PLH
575 1150 ns 548 ns + (0,55 ns/pF) C
L
HIGH to LOW
LOW to HIGH
10 210 420 ns 199 ns + (0,23 ns/pF) C
L
15 150 300 ns 142 ns + (0,16 ns/pF) C
L
Minimum clock 5 60 30 ns
pulse width; LOW 10 t
WRSL
30 15 ns
15 24 12 ns
Minimum reset 5 60 30 ns
pulse width; HIGH 10 t
WMRH
30 15 ns
15 24 12 ns
Maximum clock 5 8 16 MHz
pulse frequency 10 f
max
15 30 MHz
15 18 36 MHz
Oscillator frequency 5 90 kHz R
t
=5 kΩ
10 f
osc
90 kHz C
t
= 1 nF
15 90 kHz R
S
= 10 kΩ
Oscillator frequency 5 8 kHz R
t
= 56 kΩ
10 f
osc
8 kHz C
t
= 1 nF
15 8 kHz R
S
= 120 kΩ