Page 1
HD74HC4518/HD74HC4520
Dual BCD Use Converters/Dual Binary Up Converters
Description
The HD74HC4518 dual BCD counter and the HD74HC4520 dual binary counter consist of two identical,
independent, internally synchronous 4-stage counters. The counter stages are type D flip-flops, with
interchangeable Clock and Enable lines for incrementing on either the positive-going or negative-going
transition as required when cascading multiple stages. Each counter can be cleared by applying a high
level on the Reset line. In addition, the HD74HC4518 will count out of all undefined states within two
clock periods. These complementary MOS up counters find primary use in multi-stage synchronous or
ripple counting applications requiring low power dissipation and/or high noise immunity.
Features
• High Speed Operation
• High Output Current: Fanout of 10 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Clock Enable Reset Operation
H L Increment counter
L L Increment counter
X L No change
X L No change
L L No change
H L No change
XXHQ
to Q3 = L
0
Page 2
HD74HC4518/HD74HC4520
Pin Arrangement
Clock A
Enable A
A
Q
0
A
Q
1
A
Q
2
A
Q
3
Reset A
GND
1
2
3
4
5
6
7
8
CR
Q
0
Q
1
Q
2
Q
3
R
Q
3
Q
2
Q
1
Q
0
C
(Top view)
16
15
14
13
12
11
10
9
V
CC
Reset B
B
Q
3
B
Q
2
B
Q
1
B
Q
0
Enable B
Clock B
2
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Timing Diagram
HD74HC4518/HD74HC4520
HD74HC4518
HD74HC4520
Clock
Enable
Reset
Q
Q
Q
Q
Q
Q
Q
Q
123456789
12345678901234567890
0
1
2
3
0
1
2
3
123456789
10 11 12 13 14 15 16 17 18
10 11 12 13 14 15
01234
3
Page 4
HD74HC4518/HD74HC4520
Logic Diagram
HD74HC4518
Reset
Enable
Clock
HD74HC4520
Q
0
D
Q
C
Q
R
DCQ
Q
1
DCQ
Q
RRR
Q
2
DCQ
Q
Q
3
Q
Reset
Enable
Clock
Q
0
D
Q
C
Q
R
DCQ
Q
1
DCQ
Q
RRR
Q
2
DCQ
Q
Q
3
Q
4
Page 5
HD74HC4518/HD74HC4520
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol V
Input voltage V
IH
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
V
IL
2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Vin = VIH or VILIOH = –20 µA
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –4 mA
6.0 5.68 — — 5.63 — IOH = –5.2 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VILIOL = 20 µA
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 4 mA
6.0 — — 0.26 — 0.33 IOL = 5.2 mA
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
I
CC
6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
current
+85°C
5
Page 6
HD74HC4518/HD74HC4520
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
Ta = 25°C
Item Symbol V
Maximum clock f
max
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 5 — 4 MHz
frequency 4.5 — — 27 — 21
6.0 — — 32 — 25
Propagation delay t
time t
PLH
PHL
2.0 — — 190 — 240 ns Clock to Q
4.5 — 22 38 — 48
6.0 — — 32 — 41
t
PLH
t
PHL
2.0 — — 200 — 250 ns Reset to Q
4.5 — 22 40 — 50
6.0 — — 34 — 43
t
PLH
t
PHL
2.0 — — 190 — 240 ns Enable to Q
4.5 — 17 38 — 48
6.0 — — 32 — 41
Pulse width t
w
2.0 80 — — 100 — ns
4.5 16 7 — 20 —
6.0 14 — — 17 —
Output rise/fall t
time t
TLH
THL
2.0 — — 75 — 95 ns
4.5 — — 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
Removel time t
rem
2.0 0 — — 0 — ns Reset clock
4.5 0 –3 — 0 —
6.0 0 — — 0 —
+85°C
6
Page 7
19.20
20.00 Max
16 9
1.3
Unit: mm
6.30
7.40 Max
81
1.11 Max
2.54 ± 0.25
0.48 ± 0.10
5.06 Max
2.54 Min
0.51 Min
Hitachi Code
JEDEC
EIAJ
Weight
7.62
+ 0.13
0.25
– 0.05
0° – 15°
(reference value)
DP-16
Conforms
Conforms
1.07 g
Page 8
16
Unit: mm
10.06
10.5 Max
9
5.5
1
0.80 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.12
0.10 ± 0.10
0.15
M
2.20 Max
7.80
0.20 ± 0.04
*0.22 ± 0.05
0.70 ± 0.20
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
+ 0.20
– 0.30
1.15
0° – 8°
FP-16DA
—
Conforms
0.24 g
Page 9
16
Unit: mm
9.9
10.3 Max
9
1
1.27
0.635 Max
*0.42 ± 0.08
0.40 ± 0.06
*Dimension including the plating thickness
Base material dimension
8
0.25
+ 0.11
– 0.04
0.14
0.15
3.95
1.75 Max
M
6.10
1.08
0.20 ± 0.03
*0.22 ± 0.03
0.60
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
+ 0.67
– 0.20
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
Page 10
Cautions
1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent,
copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
2. Products and product specifications may be subject to change without notice. Confirm that you have
received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
5. This product is not designed to be radiation resistant.
6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without
written approval from Hitachi.
7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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Semiconductor & Integrated Circuits.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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