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HD74HC673
16-bit Shift Register
Description
The HD74HC673 is a 16-bit shift register and a 16-bit storage register in a single 24-pin package. A threestate input/output (data I/O) port to the shift register allows serial entry and/or reading of data. The storage
register is connected in a parallel data loop with the shift register and may be asynchronously cleared by
taking the store-clear input low. The storage register may be parallel loaded with shift-register data to
provide shift-register status via the parallel outputs. The shift register can be parallel loaded with the
storage-register data upon command.
A high logic level at the chip-select (CS) input disables both the shift-register clock and the storage register
clock and places the data I/O in the high-impedance state. The store-clear function is not disabled by the
chip select.
Caution must be exercised to prevent false clocking of either the shift register or the storage register via the
chip-select input. The shift clock should be low during the low-to-high transition of chip select and the
store clock should be low during the high-to-low transition of chip select.
Features
• High Speed Operation: tpd (MODE/STRCLK to Y) = 23 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads (Q15 output)
• 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)
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HD74HC673
Function Table
Inputs Shift Register Functions Storage Register
Mode/ SER/ Read from Write into Parallel Functions
CS R/W SHCLK STRCLR STRCLK Q
H X X X X Z No No No No No
X X X L X Yes
LL X X Z Yes No Yes No
LHX X X Q
LH XL Q
LH L H L No Yes Yes Yes No
LH HHY
LLX H Z No No No Yes
Pin Arrangement
Shift Serial Output Serial Input Load Clear Load
15
15
14n
15n
Yes No No
Yes Yes No No No
No Yes Yes No No
CS
SH CLK
R/W
STRCLR
Mode/STRCLK
SER/Q
Y
Y
Y
Y
Y
GND
1
2
3
4
5
6
15
7
0
8
1
9
2
10
3
11
4
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
Y
15
Y
14
Y
13
Y
12
Y
11
Y
10
Y
9
Y
8
Y
7
Y
6
Y
5
(Top view)
2
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HD74HC673
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P
CC
IN
OUT
OUT
GND
IK
OK
T
Storage temperature Tstg –65 to +150 °C
Logic Diagram
–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V
±35 mA
±75 mA
±20 mA
±20 mA
500 mW
SER Q
CS
SHCLK
R W
M S
STRCLR
15
IN
PE
SCK
P
V
CC
DYQ
CK
CLR
X
12
Y
0
Y
1
Y
2
Y
13
Y
14
Y
15
3
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HD74HC673
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 Q
4.5 4.4 4.5 — 4.4 — Vin = VIH or V
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 — IOH = –6 mA
6.0 5.68 — — 5.63 — IOH = –7.8 mA
V
OL
2.0 — 0.0 0.1 — 0.1 V Q
4.5 — 0.0 0.1 — 0.1 Vin = VIH or V
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33 IOL = 6 mA
6.0 — — 0.26 — 0.33 IOL = 7.8 mA
Output voltage V
OH
2.0 1.9 2.0 — 1.9 — V Y0 to Y
4.5 4.4 4.5 — 4.4 — Vin = VIH or V
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 Y0 to Y
4.5 — 0.0 0.1 — 0.1 Vin = VIH or V
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
Off-state output
I
OZ
6.0 — — ±0.5 — ±5.0 µA Vin = VIH or VIL,
current
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
15
15
Vout = V
15
15
CC
IL
IL
IL
IL
or GND
IOH = –20 µA
IOL = 20 µA
IOH = –20 µA
IOL = 20 µA
4
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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 — — 200 — 250 ns STRCLR to Y
4.5 — 23 40 — 50
6.0 — — 34 — 43
t
PLH
t
PHL
2.0 — — 200 — 250 ns Mode/STRCLK to Y
4.5 — 23 40 — 50
6.0 — — 34 — 43
t
PLH
t
PHL
2.0 — — 200 — 250 ns SHCLK to SER/Q
4.5 — 19 40 — 50
6.0 — — 34 — 43
Output enable t
time t
ZH
ZL
2.0 — — 150 — 190 ns
4.5 — — 30 — 38
6.0 — — 26 — 33
Output disable t
time t
HZ
LZ
2.0 — — 150 — 190 ns
4.5 — — 30 — 38
6.0 — — 26 — 33
Pulse width t
w
2.0 80 — — 100 — ns
4.5 16 6 — 20 —
6.0 14 — — 17 —
Setup time t
su
2.0 100 — — 125 — ns SER/Q15 to SH CLK
4.5 20 1 — 25 —
6.0 17 — — 21 —
t
su
2.0 100 — — 125 — ns CS to R/W
4.5 20 7 — 25 —
6.0 17 — — 21 —
Hold time t
h
2.0 5 — — 5 — ns SH CLK to SER/Q
4.5 5 0 — 5 —
6.0 5 — — 5 —
+85°C
HD74HC673
15
15
5
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HD74HC673
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) (cont)
Ta = –40 to
Ta = 25°C
Item Symbol V
Output rise/fall t
time t
TLH
THL
(V) Min Typ Max Min Max Unit Test Conditions
CC
2.0 — — 60 — 75 ns 6 Pin
4.5 — 4 12 — 15
6.0 — — 10 — 13
t
TLH
t
THL
2.0 — — 75 — 95 ns Other Pins
4.5 — 5 15 — 19
6.0 — — 13 — 16
Input capacitance Cin — — 5 10 — 10 pF
+85°C
6
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31.6
24 13
32.5 Max
13.4
15.0 Max
Unit: mm
112
1.2
15.24
2.13 Max
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
2.54 Min 5.70 Max
0.25
0° – 15°
Hitachi Code
JEDEC
EIAJ
(reference value)
Weight
DP-24
Conforms
Conforms
3.1 g
+ 0.11
– 0.05
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Cautions
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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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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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