74HC297 데이터 시트보기 (PDF) - Philips Electronics
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74HC297 Datasheet PDF : 12 Pages
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Philips Semiconductors
Digital phase-locked-loop filter
Product specification
74HC/HCT297
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard/bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for
a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit
load coefficient shown in the table below.
INPUT
ENCTR, D/U
A, B, C, D, KCP, φA2
I/DCP, φA1, φB
UNIT LOAD COEFFICIENT
0.3
0.6
1.5
AC CHARACTERISTICS FOR 74HCT
GND = 0 V, tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tTHL/ tTLH
tTHL/ tTLH
propagation delay
I/DCP to I/DOUT
propagation delay
φA1, φB to XORPDOUT
propagation delay
φB, φA2 to ECPDOUT
output transition time
bus driver output
I/DOUT (pin 7)
output transition time
standard outputs
XORPDOUT, ECPDOUT
(pins 11, 12)
21 35
16 32
22 44
5 12
7 15
tW
clock pulse width
KCP
16 8
tW
clock pulse width
I/DCP
25 13
tsu
set-up time
24 13
D/U, ENCTR to KCP
th
hold time
0 −8
D/U, ENCTR to KCP
fmax
maximum clock pulse
30 62
frequency KCP
fmax
maximum clock pulse
20 36
frequency I/DCP
44
40
55
15
19
20
31
30
0
24
16
53
48
66
18
22
24
38
36
0
20
13
ns 4.5 Fig.11
ns 4.5 Fig.12
ns 4.5 Fig.13
ns 4.5 Fig.11
ns 4.5 Figs 12 and 13
ns 4.5 Fig.14
ns 4.5 Fig.11
ns 4.5 Fig.14
ns 4.5 Fig.14
MHz 4.5 Fig.14
MHz 4.5 Fig.11
September 1993
10
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