74HCT390 [NXP]
Dual decade ripple counter; 双十年纹波计数器
| 型号： | 74HCT390 |
| 厂家： | 
NXP |
| 描述： | Dual decade ripple counter |
| 文件： | 总7页 (文件大小：53K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT390
Dual decade ripple counter
December 1990
Product specification
File under Integrated Circuits, IC06
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
decade or bi-quinary configuration, since they share a
common master reset input (nMR). If the two master reset
inputs (1MR and 2MR) are used to simultaneously clear all
8 bits of the counter, a number of counting configurations
are possible within one package. The separate clocks
(nCP0 and nCP1 ) of each section allow ripple counter or
frequency division applications of divide-by-2, 4, 5, 10, 20,
25, 50 or 100.
FEATURES
• Two BCD decade or bi-quinary counters
• One package can be configured to divide-by-2, 4, 5, 10,
20, 25, 50 or 100
• Two master reset inputs to clear each decade counter
individually
• Output capability: standard
• ICC category: MSI
Each section is triggered by the HIGH-to-LOW transition of
the clock inputs (nCP0 and nCP1 ). For BCD decade
operation, the nQ0 output is connected to the nCP1 input
of, the divide-by-5 section. For bi-quinary decade
operation, the nQ3 output is connected to the nCP0 input
and nQ0 becomes the decade output.
GENERAL DESCRIPTION
The 74HC/HCT390 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The master reset inputs (1MR and 2MR) are active HIGH
asynchronous inputs to each decade counter which
operates on the portion of the counter identified by the “1”
and “2” prefixes in the pin configuration. A HIGH level on
the nMR input overrides the clocks and sets the four
outputs LOW.
The 74HC/HCT390 are dual 4-bit decade ripple counters
divided into four separately clocked sections. The counters
have two divide-by-2 sections and two divide-by-5
sections. These sections are normally used in a BCD
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
propagation delay
CONDITIONS
UNIT
HC HCT
tPHL/ tPLH
CL = 15 pF; VCC = 5 V
nCP0 to nQ0
14
18
19
26
19
18
61
3.5
21
ns
nCP1 to nQ1
15
23
15
16
66
3.5
20
ns
nCP1 to nQ2
ns
nCP1 to nQ3
ns
nMR to Qn
ns
fmax
CI
maximum clock frequency nCP0, nCP1
input capacitance
MHz
pF
pF
CPD
power dissipation capacitance per counter
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
2
PD = CPD × VCC2 × fi + ∑ (CL × VCC × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
2
∑ (CL × VCC × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC −1.5 V
December 1990
2
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1, 15
1CP0, 2CP0
1MR, 2MR
1Q0 to 1Q3
1CP1, 2CP1
GND
clock input divide-by-2 section (HIGH-to-LOW, edge-triggered)
asynchronous master reset inputs (active HIGH)
flip-flop outputs
2, 14
3, 5, 6, 7
4, 12
clock input divide-by-5 section (HIGH-to-LOW, edge triggered)
ground (0 V)
8
13, 11, 10, 9
16
2Q0 to 2Q3
VCC
flip-flop outputs
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
BCD COUNT SEQUENCE
FOR 1/2 THE “390”
BI-QUINARY COUNT SEQUENCE
FOR 1/2 THE “390”
OUTPUTS
Q0 Q1 Q2
OUTPUTS
COUNT
COUNT
Q3
Q0 Q1 Q2
Q3
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
L
L
L
L
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
H
L
L
L
L
H
L
L
H
H
L
L
L
H
H
L
H
L
L
L
H
L
H
H
H
H
L
L
H
L
L
L
L
H
H
L
L
H
H
H
H
H
L
L
H
H
L
H
L
L
H
L
H
H
L
H
H
H
L
H
L
L
Notes
Note
1. Output Q0 connected to nCP1
with counter input on nCP0.
H = HIGH voltage level
1. Output Q3 connected to nCP0
with counter input on nCP1.
L = LOW voltage level
Fig.4 Functional diagram.
Fig.5 Logic diagram (one counter).
December 1990
4
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HC
SYMBOL
PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85 −40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
nCP0 to nQ0
47
17
14
145
29
25
180
36
31
220
44
38
ns
ns
ns
ns
ns
ns
ns
ns
ns
2.0 Fig.6
4.5
6.0
t
t
t
PHL/ tPLH propagation delay
nCP1 to nQ1
50
18
14
155
31
26
195
39
33
235
47
40
2.0 Fig.6
4.5
6.0
PHL/ tPLH propagation delay
nCP1 to nQ2
74
27
22
210
42
36
265
53
45
315
63
54
2.0 Fig.6
4.5
6.0
PHL/ tPLH propagation delay
nCP1 to nQ3
50
18
14
155
31
26
195
39
33
235
47
40
2.0 Fig.6
4.5
6.0
tPHL
propagation delay
nMR to nQn
52
19
15
165
33
28
205
41
35
250
50
43
2.0 Fig.7
4.5
6.0
tTHL/ tTLH output transition time
19
7
6
75
15
13
95
19
16
110
22
19
2.0 Fig.6
4.5
6.0
tW
clock pulse width
nCP0, nCP1
80
16
14
19
7
6
100
20
17
120
24
20
2.0 Fig.6
4.5
6.0
tW
master reset pulse width
HIGH
80
17
14
28
10
8
105
21
18
130
26
22
2.0 Fig.7
4.5
6.0
trem
removal time
nMR to nCPn
75
15
13
22
8
6
95
19
16
110
22
19
2.0 Fig.7
4.5
6.0
fmax
maximum clock pulse
frequency
nCP0, nCP1
6.0
30
35
20
60
71
4.8
24
28
4.0
20
24
MHz 2.0 Fig.6
4.5
6.0
December 1990
5
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
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
UNIT LOAD COEFFICIENT
nCP0
nCP1, nMR
0.45
0.60
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HCT
SYMBOL
PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85 −40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
nCP0 to nQ0
21
22
30
22
21
7
34
38
51
38
36
15
43
48
64
48
45
19
51
57
77
57
54
22
ns
ns
ns
ns
ns
ns
ns
ns
ns
4.5 Fig.6
4.5 Fig.6
4.5 Fig.6
4.5 Fig.6
4.5 Fig.7
4.5 Fig.6
4.5 Fig.6
4.5 Fig.7
4.5 Fig.7
t
t
t
PHL/ tPLH propagation delay
nCP1 to nQ1
PHL/ tPLH propagation delay
nCP1 to nQ2
PHL/ tPLH propagation delay
nCP1 to nQ3
tPHL
propagation delay
nMR to nQn
t
THL/ tTLH output transition time
tW
clock pulse width
nCP0, nCP1
18
17
15
27
8
23
21
19
22
27
26
22
18
tW
master reset pulse width
HIGH
10
8
trem
fmax
removal time
nMR to nCPn
maximum clock pulse
frequency
55
MHz 4.5 Fig.6
nCP0, nCP1
December 1990
6
Philips Semiconductors
Product specification
Dual decade ripple counter
74HC/HCT390
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC
.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.6 Waveforms showing the clock (nCPn) to output (nQn) propagation delays, the clock pulse width, the output
transition times and the maximum clock frequency.
(1) HC : VM = 50%; VI = GND to VCC
.
HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.7 Waveforms showing the master reset (nMR) pulse width, the master reset to output (nQn) propagation
delays and the master reset to clock (nCPn) removal time.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
7
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