MM74HC594 8-Bit Shift Register with Output Registers
January 1992
Revised May 1999
MM74HC594
8-Bit Shift Register with Output Registers
General Description
This high speed shift register utilizes advanced silicon-gate
CMOS technology. This device possesses the high noise
immunity and low power consumption of standard CMOS
integrated circuits, as well as the ability to drive 15 LS-TTL
loads.
This device contains an 8-bit serial-in, parallel-out shift reg-
ister that feeds an 8-bit D-type storage register. Separate
clocks and direct overriding clears are provided for both the
shift register and the storage register. The shift register has
a direct-overriding clear, serial input, and serial output
(standard) pins for cascading. Both the shift register and
storage register use positive-edge triggered clocks. If both
clocks are connected together, the shift register state will
always be one clock pulse ahead of the storage register.
The 74HC logic family is speed, function, and pin-out com-
patible with the standard 74LS logic family. All inputs are
protected from damage due to static discharge by internal
diode clamps to V
CC
and ground.
Features
s
Low quiescent current: 80
µA
maximum
s
Low input current: 1
µA
maximum
s
8-bit serial-in, parallel-out shift register with storage
s
Wide operating voltage range: 2V to 6V
s
Cascadable
s
Shift register has direct clear
s
Guaranteed shift frequency: DC to30 MHz
Ordering Code:
Order Number
MM74HC594M
MM74HC594N
Package Number
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
RCK
X
X
X
SCK
X
X
↑
SCLR RCLR
X
L
H
L
X
H
Function
Storage Register cleared
Shift Register cleared
Q’
H
=
0
Shift Register clocked
Q
N
=
Q
n−1
, Q
0
=
SER
Contents of Shift
↑
X
H
H
Register transferred
to output latches
© 1999 Fairchild Semiconductor Corporation
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MM74HC594
Absolute Maximum Ratings
(Note 1)
(Note 2)
Supply Voltage (V
CC
)
DC Input Voltage (V
IN
)
DC Output Voltage (V
OUT
)
Clamp Diode Current (I
IK
, I
OK
)
DC Output Current, per pin (I
OUT
)
DC V
CC
or GND Current, per pin (I
CC
)
Storage Temperature Range (T
STG
)
Power Dissipation (P
D
)
(Note 3)
S.O. Package only
Lead Temperature (T
L
)
(Soldering 10 seconds)
260°C
600 mW
500 mW
−0.5
to
+7.0V
−1.5
to V
CC
+1.5V
−0.5
to V
CC
+0.5V
±20
mA
±35
mA
±70
mA
−65°C
to
+150°C
Recommended Operation
Conditions
Min
Supply Voltage (V
CC
)
DC Input or Output Voltage
(V
IN
, V
OUT
)
Operating Temperature Range (T
A
)
Input Rise or Fall Times
(t
r
, t
f
)
V
CC
=
2.0V
V
CC
=
4.5V
V
CC
=
6.0V
1000
500
400
ns
ns
ns
−40
+85
°C
2
0
Max
6
V
CC
Units
V
V
Note 1:
Absolute Maximum Ratings are those values beyond which dam-
age to the device may occur.
Note 2:
Unless otherwise specified all voltages are referenced to ground.
Note 3:
Power Dissipation temperature derating—plastic “N” package:
−12
mW/°C from 65°C to 85°C.
DC Electrical Characteristics
Symbol
V
IH
Parameter
Minimum HIGH Level
Input Voltage
V
IL
Maximum LOW Level
Input Voltage
V
OH
Minimum HIGH Level
Output Voltage
(Note 4)
V
CC
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
T
A
=
25°C
Typ
1.5
3.15
4.2
0.5
1.35
1.8
2.0
4.5
6.0
4.7
5.2
4.2
5.7
0
0
0
0.2
0.2
0.2
0.2
1.9
4.4
5.9
3.98
5.48
3.98
5.48
0.1
0.1
0.1
0.26
0.26
0.26
0.26
±0.1
8.0
T
A
= −40
to 85°C
Guaranteed Limits
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
3.84
5.34
3.84
5.34
0.1
0.1
0.1
0.33
0.33
0.33
0.33
±1.0
80
µA
µA
V
V
V
V
V
V
Units
Conditions
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
20
µA
2.0V
4.5V
6.0V
V
Q’
H
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
4.0 mA
|I
OUT
|
≤
5.2 mA
4.5V
6.0V
4.5V
6.0V
2.0V
4.5V
6.0V
Q
A
thru Q
H
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
6.0 mA
|I
OUT
|
≤
7.8 mA
V
OL
Maximum LOW Level
Output Voltage
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
20
µA
V
Q’
H
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
4.0 mA
|I
OUT
|
≤
5.2 mA
4.5V
6.0V
4.5V
6.0V
6.0V
6.0V
Q
A
thru Q
H
V
IN
=
V
IH
or V
IL
|I
OUT
|
≤
6.0 mA
|I
OUT
|
≤
7.8 mA
I
IN
I
CC
Maximum Input
Current
Maximum Quiescent
Supply Current
V
IN
=
V
CC
or GND
V
IN
=
V
CC
or GND
I
OUT
=
0
µA
Note 4:
For a power supply of 5V
±10%
the worst case output voltages (V
OH
, and V
OL
) occur for HC at 4.5V. Thus the 4.5V values should be used when
designing with this supply. Worst case V
IH
and V
IL
occur at V
CC
=
5.5V and 4.5V respectively. (The V
IH
value at 5.5V is 3.85V.) The worst case leakage cur-
rent (I
IN
, I
CC
, and I
OZ
) occur for CMOS at the higher voltage and so the 6.0V values should be used.
3
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MM74HC594
AC Electrical Characteristics
V
CC
= 2.0V to 6.0V, C
L
= 50 pF, t
r
= t
f
= 6 ns (unless otherwise specified)
Symbol
f
MAX
Parameter
Maximum Operating
Frequency
t
PHL
, t
PLH
Maximum Propagation Delay
from SCK to Q’
H
t
PHL
, t
PLH
Maximum Propagation Delay
from RCK to Q
A
thru Q
H
C
L
=
50 pF
C
L
=
150 pF
C
L
=
50 pF
C
L
=
150 pF
C
L
=
50 pF
C
L
=
150 pF
t
PHL
, t
PLH
Maximum Propagation Delay
from SCLR to Q’
H
t
PHL
Maximum Propagation Delay
from RCLR to Q
A
thru Q
H
C
L
=
150 pF
C
L
=
50 pF
C
L
=
50 pF
Conditions
C
L
=
50 pF
V
CC
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
2.0V
4.5V
4.5V
6.0V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
t
S
SCLR LOW to RCK
2.0V
4.5V
6.0V
t
S
RCLR HIGH to SCK
2.0V
4.5V
6.0V
t
S
Minimum Setup Time
from SER to SCK
t
R
Minimum Removal Time
from SCLR to SCK
t
S
Minimum Setup Time
from SCK to RCK
t
H
Minimum Hold Time
SER to SCK
t
W
Minimum Pulse Width
of SCK or SCLR or
RCK or RCLR
t
r
, t
f
Maximum Input Rise and
Fall Time, Clock
t
THL
, t
TLH
Maximum Output
Rise and Fall Time
Q
A
- Q
H
t
THL
, t
TLH
Maximum Output
Rise and Fall Time
Q’
H
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
2.0V
4.5V
6.0V
T
A
=
25°C
Typ
6
30
35
150
30
25
150
200
30
40
25
34
150
30
25
125
25
21
200
40
34
50
10
9
5
5
5
90
18
15
20
10
10
90
18
15
5
5
5
100
20
17
1000
500
400
60
12
10
75
15
13
−40°C
to
+85°C
Guaranteed Limits
4.8
24
28
185
37
31
185
250
37
50
31
43
185
37
31
155
31
26
250
50
43
63
13
11
5
5
5
110
22
19
20
10
10
110
22
19
5
5
5
125
25
21
1000
500
400
75
15
13
95
19
16
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
Units
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4
MM74HC594
AC Electrical Characteristics
Symbol
C
PD
Parameter
(Continued)
T
A
=
25°C
Typ
90
150
5
15
10
20
10
20
pF
pF
pF
−40°C
to
+85°C
Guaranteed Limits
Conditions
V
CC
Units
Power Dissipation Capacitance, G
=
V
CC
Outputs Enabled (Note 5)
G
=
GND
Maximum Input Capacitance
Maximum Output Capacitance
C
IN
C
OUT
Note 5:
C
PD
determines the no load dynamic power consumption, and the no load dynamic current consumption.
5
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