Page 1
HD74AC298/HD74ACT298
Quad 2-Input Multiplexer with Storage
Description
This device is a high-speed multiplexer with storage. It selects four bits of data from two sources (Ports)
under the control of a common Select input (S). The selected data is transferred to the 4-bit output register
synchronous with the HIGH-to-LOW transition of the Clock input (CP). The 4-bit register is fully edge
triggered. The Data inputs (I0 and I1) and Select input (S) must be stable only one setup time prior to the
HIGH-to-LOW transition of the clock for predictable operation.
Features
• Outputs Source/Sink 24 mA
• HD74ACT298 has TTL-Compatible Inputs
Pin Arrangement
I
I1a
I0a
I0b
I1c
I1d
I0d
GND
1
1b
2
3
4
5
6
7
8
(Top view)
16
15
14
13
12
11
10
CC
V
Qa
Qb
Qc
Qd
CP
S
9
0c
I
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HD74AC298/HD74ACT298
Logic Symbol
I0a I1a I0b I1b
S
CP
Qa Qb Qc Qd
Pin Names
I1a – I
I0a – I
S Select Input
CP Clock Pulse Input (Active Falling Edge)
Qa – QdOutputs
Source 1 Data Inputs
1d
Source 0 Data Inputs
0d
Function Table
Inputs Outputs
SCpQ
L a
H a
XH QA0Q
a
1
2
I0c I1c I0d I1d
Q
b
b
1
b
2
B0
Q
c
c
1
c
2
Q
C0
Q
d
d
1
d
2
Q
D0
2
Page 3
Logic Diagram
S
CP
HD74AC298/HD74ACT298
I1a I0a I1b I0b I1c I0c I1d I0d
R
CP
SQa
R
CP
b
SQ
R
CP
c
SQ
R
CP
SQ
DC Characteristics (unless otherwise specified)
Item Symbol Max Unit Condition
Maximum quiescent supply current I
CC
80 µAV
= VCC or ground, VCC = 5.5 V,
IN
Ta = Worst case
Maximum quiescent supply current I
CC
8.0 µAV
= VCC or ground, VCC = 5.5 V,
IN
Ta = 25°C
Maximum ICC/input (HD74ACT298) I
CCT
1.5 mA VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC298
Ta = +25°C
C
= 50 pF
L
Item Symbol V
Maximum count f
max
(V)*1Min Typ Max Min Max Unit
CC
3.3 90 — — 70 — MHz
frequency 5.0 110 — — 100 —
Propagation delay t
PLH
3.3 1.0 7.0 10.0 1.0 11.5 ns
CP to Q 5.0 1.0 5.0 7.5 1.0 8.5
Propagation delay t
PHL
3.3 1.0 7.5 10.0 1.0 11.5
CP to Q 5.0 1.0 5.5 7.5 1.0 8.5
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Ta = –40°C to +85°C
CL = 50 pF
d
QdQcQbQa
3
Page 4
HD74AC298/HD74ACT298
AC Operating Requirements: HD74AC298
Ta = –40°C
Ta = +25°C
C
= 50 pF
L
Item Symbol V
Setup time, HIGH or LOW t
su
(V)*1Typ Guaranteed Minimum Unit
CC
3.3 4.5 5.5 7.0 ns
D or S to CP 5.0 2.5 4.5 5.5
Hold time, HIGH or LOW t
Dn to CP
n
Hold time, HIGH or LOW t
h
h
3.3 –2.0 0.0 0.0 ns
5.0 –1.0 0.0 0.0
3.3 –3.0 0.5 0.5 ns
S to CP 5.0 –1.5 0.5 0.5
Pulse with t
w
3.3 3.0 5.5 7.0 ns
5.0 3.0 4.5 5.0
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
AC Characteristics: HD74ACT298
to +85°C
CL = 50 pF
Item Symbol V
Maximum count
f
max
(V)*1Min Typ Max Min Max Unit
CC
5.0 70 — — 60 — MHz
frequency
Propagation delay
t
PLH
5.0 1.0 6.0 10.0 1.0 11.0 ns
CP to Q
Propagation delay
t
PHL
5.0 1.0 6.5 10.0 1.0 11.0
CP to Q
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Ta = +25°C
C
= 50 pF
L
Ta = –40°C to +85°C
CL = 50 pF
4
Page 5
HD74AC298/HD74ACT298
AC Operating Requirements: HD74ACT298
Ta = –40°C
Ta = +25°C
C
= 50 pF
L
Item Symbol V
Setup time, HIGH or LOW
D
or S to CP
n
Hold time, HIGH or LOW
D
to CP
n
Hold time, HIGH or LOW
t
su
t
h
t
h
(V)*1Typ Guaranteed Minimum Unit
CC
5.0 3.5 5.5 6.5 ns
5.0 –5.0 1.0 1.0 ns
5.0 –0.5 1.0 1.0 ns
S to CP
Pulse with t
w
5.0 3.0 7.0 8.0 ns
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item Symbol Typ Unit Condition
Input capacitance C
Power dissipation capacitance C
IN
PD
4.5 pF VCC = 5.5 V
30 pF VCC = 5.0 V
to +85°C
CL = 50 pF
5
Page 6
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 7
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 8
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
+ 0.67
0.60
– 0.20
Hitachi Code
JEDEC
EIAJ
Weight
+ 0.10
– 0.30
0° – 8°
(reference value)
FP-16DN
Conforms
Conforms
0.15 g
Page 9
16 9
18
+ 0.08
*0.22
– 0.07
0.20 ± 0.06
5.00
5.30 Max
0.65 Max
0.65
0.13
Unit: mm
4.40
1.0
M
6.40 ± 0.20
0.10
1.10 Max
*Dimension including the plating thickness
Base material dimension
0.15 ± 0.04
*0.17 ± 0.05
+0.03
–0.04
0.07
0° – 8°
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
0.50 ± 0.10
TTP-16DA
—
—
0.05 g
Page 10
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
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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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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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