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74HC5555 View Datasheet(PDF) - NXP Semiconductors.

Part NameDescriptionManufacturer
74HC5555 Programmable delay timer with oscillator NXP
NXP Semiconductors. NXP
74HC5555 Datasheet PDF : 23 Pages
First Prev 11 12 13 14 15 16 17 18 19 20 Next Last
Philips Semiconductors
Programmable delay timer with oscillator
APPLICATION INFORMATION
Product specification
74HC/HCT5555
handbook, halfpage
R bias = 560 k
VCC
0.47 µF input
vi
(f = 1 kHz)
output 100 µF
A io
GND
MGA645
Fig.11 Test set-up for measuring forward
transconductance gfs = dio/dvi at vo is
constant (see Fig.12) and MR = LOW.
handbookg,
14
hfsalfpage
(mA/V)
12
10
MBA333
max.
typ.
8
min.
6
4
2
0
1
2
3
4
5
6
VCC (V)
Fig.12 Typical forward transconductance gfs as a
function of the supply voltage at VCC at
Tamb = 25 °C.
handbook1, 0ha5lfpage
f osc
(Hz)
10 4
103
Rt
Ct
MGA647
102
10
103
10 – 4
104
10 – 3
105 R t () 106
10 – 2 C t ( µF) 10 – 1
Ct curve at Rt = 100 k; R2 = 200 k.
Rt curve at Ct = 1 nF; R2 = 2 x Rt.
RC oscillator frequency as a function of Rt and Ct
at VCC = 2 to 6 V; Tamb = 25 °C.
Fig.13 Application information.
handbook, halfpage
MR (from logic)
1 RS
C2
R2
R TC
2
C TC
3
Rt
Ct
MGA646
Typical formula for oscillator frequency:
fosc = 2----.--5----×-----1R-----t--×-----C----t
Fig.14 Example of an RC oscillator.
September 1993
20
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