参数资料
型号: 74HC5555D/T3
厂商: NXP SEMICONDUCTORS
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO16
封装: PLASTIC, SO-16
文件页数: 13/23页
文件大小: 108K
代理商: 74HC5555D/T3
September 1993
20
Philips Semiconductors
Product specication
Programmable delay timer with oscillator
74HC/HCT5555
APPLICATION INFORMATION
Fig.11 Test set-up for measuring forward
transconductance gfs = dio/dvi at vo is
constant (see Fig.12) and MR = LOW.
handbook, halfpage
MGA645
A
output
100 F
V
CC
input
0.47 F
R
= 560 k
bias
i o
(f = 1 kHz)
GND
v
i
Fig.12 Typical forward transconductance gfs as a
function of the supply voltage at VCC at
Tamb = 25 °C.
handbook, halfpage
MBA333
14
12
10
8
6
4
2
0123
456
g
fs
(mA/V)
CC
V
(V)
max.
min.
typ.
Fig.13 Application information.
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.
handbook, halfpage
103
MGA647
104
105
106
10
105
103
10 4
102
f osc
(Hz)
R ( )
t
C ( F)
t
10 –4
10 –3
10 –2
10 –1
R t
C t
Fig.14 Example of an RC oscillator.
Typical formula for oscillator frequency:
f
osc
1
2.5
R
t
C
t
×
--------------------------------
=
handbook, halfpage
MGA646
2
RS
1
MR (from logic)
R TC
C TC
3
R t
C t
C2
R2
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