74HCT595
8-BIT SHIFT REGISTER WITH 8-BIT OUTPUT REGISTER
Description
The 74HCT595 is an high speed CMOS device that is designed to
be pin compatable with 74LS low power Schottky types.
An eight bit shift register accpets data from the serial input (DS)
on each positive transition of the shift register clock (STCP).
When asserted low the reset function (MR) sets all shift register
values to zero and is indepent of all clocks.
Pin Assignments
Preliminary
Data from the input serial shift register is placed in the output
register with a rising pulse on the storages resister clock (SHCP).
With the output enable (OE
asserted low the 3-state outputs Q0-
Q7 become active and present th
All registers capture data on rising edge and change output on the
falling edge. If both clocks are connected together the input shift
register is always one clock cycle ahead of the output register.
Features
•
•
•
•
•
•
Supply Voltage Range from 4.5V to 5.5V
Sinks or sources 8mA at V
CC
= 4.5V
CMOS low power consumption
Schmitt Trigger Action at All Inputs
Inputs accept up to 6.0V
ESD Protection Tested per JESD 22
Exceeds 200-V Machine Model (A115-A)
Exceeds 2000-V Human Body Model (A114-A)
Exceeds 1000-V Charged Device Model (C101C)
•
•
•
Latch-Up Exceeds 250mA per JESD 78, Class II
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
•
•
•
•
General Purpose Logic
Serial to Parallel Data conversion
Capture and hold data for extended periods of time.
Allow simple serial bit streams from a microcontroller to
control as many peripheral lines as needed.
•
Wide array of products such as:
o
o
o
Computer peripherals
Appliances
Industrial control
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,
"Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000 ppm antimony compounds.
Click for Ordering Information
74HCT595
Document number: DS35493 Rev. 3 - 2
1 of 11
www.diodes.com
July 2013
© Diodes Incorporated
74HCT595
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
Q1
Q2
Q3
Q4
Q5
Q6
Q7
GND
Q7S
MR
SHCP
STCP
OE
DS
Q0
Vcc
Description
Parallel Data Output 1
Parallel Data Output 2
Parallel Data Output 3
Parallel Data Output 4
Parallel Data Output 5
Parallel Data Output 6
Parallel Data Output 7
Ground
Serial Data Output
Master Reset Input
Shift Register Clock Input
Storage Register Clock Input
Output Enable Input
Serial Data Input
Parallel Data Output 0
Supply Voltage
Functional Diagram
Preliminary
Logic Diagram
STAGE 0
DS
D
FF0
CP
SHCP
Q
D
STAGES 1 TO 6
Q
STAGE 7
D
FF7
CP
Q
Q7S
R
R
MR
D
LATCH
CP
STCP
Q
D
LATCH
CP
Q
OE
Q0
Q1 Q2 Q3
Q4 Q5 Q6
Q7
74HCT595
Document number: DS35493 Rev. 3 - 2
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July 2013
© Diodes Incorporated
74HCT595
Functional Description and Timing Diagram
Control
SHCP
X
X
X
STCP
X
↑
X
OE
L
L
H
MR
L
L
L
Input
DS
Q7S
L
L
L
Output
Qn
NC
L
Z
Function
Low-level asserted on MR clears shift register
Storage register is unchanged
Empty shift register transferred to storage register
Shift register remains clear; All Q ouputs in Z state
HIGH is shifted into first stage of Shift Register Contents of each
register shifted to next register
The content of Q6S has been shifted to Q7S and now appears on
device pin Q7S
Contents of shift register copied to storage register
With output now in active state, the storage resister contents
appear on Q outputs
Contents of shift register copied to output register then shift register
shifted.
Preliminary
↑
X
L
H
Q6S
NC
X
↑
L
H
NC
QnS
↑
↑
L
H
Q6S
QnS
H=HIGH voltage state
L=LOW voltage state
↑=LOW
to HIGH transition
X= don’t care – high or low (not floating)
NC= No change
Z= high-impedance state
74HCT595
Document number: DS35493 Rev. 3 - 2
3 of 11
www.diodes.com
July 2013
© Diodes Incorporated
74HCT595
Absolute Maximum Ratings
(Note 4) (@T
A
= +25°C°C, unless otherwise specified.)
Symbol
ESD HBM
ESD CDM
ESD MM
V
CC
V
I
V
o
I
IK
I
IK
I
OK
I
OK
I
O
I
CC
I
GND
T
J
T
STG
P
TOT
Note:
Description
Human Body Model ESD Protection
Charged Device Model ESD Protection
Machine Model ESD Protection
Supply Voltage Range
Input Voltage Range
Voltage applied to output in high or low state
Input Clamp Current
Input Clamp Current
Output Clamp Current
Output Clamp Current
V
I
< -0.5V
V
I
> Vcc +0.5V
V
O
< -0.5V
V
O
> V
CC
+ 0.5V
Q7 standard output
Qn bus driver outputs
Rating
2
1
200
-0.5 to +7.0
-0.5 to +7.0
-0.3 to V
CC
+0.5
-20
20
-20
20
+/- 25
+/- 35
70
-70
-40 to +150
-65 to +150
500
Unit
kV
kV
V
V
V
V
mA
mA
mA
mA
mA
mA
mA
mA
°C
°C
mW
Preliminary
Continuous output current
Continuous current through V
CC
or GND
Continuous current through V
CC
or GND
Operating Junction Temperature
Storage Temperature
Total Power Dissipation
4. Stresses beyond the absolute maximum may result in immediate failure or reduced reliability. These are stress values, and device
operation should be within recommend values.
Recommended Operating Conditions
(Note 5)
Symbol
V
CC
V
I
V
O
t/V
T
A
Note:
(@T
A
= +25°C°C, unless otherwise specified.)
Min
4.5
0
0
-40
Max
5.5
5.5
V
CC
100
125
Unit
V
V
V
ns/V
°C
Parameter
Supply Voltage
Input Voltage
Output Voltage
Input transition rise or fall rate
Operating free-air temperature
Conditions
Active Mode
V
CC
= 4.5V to 5.5V
5. Unused inputs should be held at V
cc
or Ground.
74HCT595
Document number: DS35493 Rev. 3 - 2
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July 2013
© Diodes Incorporated
74HCT595
Electrical Characteristics
(@T
A
= +25°C°C, unless otherwise specified.)
T
A
= +25°C°C
Min
V
IH
V
IL
High-Level
Input Voltage
Low-Level
Input Voltage
4.5V to
5.5V
4.5V to
5.5V
4.5V
4.5V
4.5V
2.0
4.4
3.84
3.7
Typ
4.5
4.32
4.32
0
0.15
.016
Max
0.8
0.1
0.33
0.33
±0.1
T
A
= -40°C°C to
+85°C°C
Min
2.0
4.4
4.32
4.32
Max
0.8
0.1
0.33
0.33
±1
T
A
= -40°C°C to
+125°C°C
Min
2.0
4.4
3.7
3.7
Max
0.8
0.1
0.4
0.4
±1
μA
V
V
V
V
Symbol
Parameter
Test Conditions
V
CC
Unit
Preliminary
I
OH
= -20μA
High-Level
Output Voltage All outputs
V
OH
Q7S output
Qn Bus
Outputs
I
OH
= -4mA
I
OH
= -6.0mA
I
OL
= 20μA
Low-Level
Output Voltage All outputs
V
OL
Q7S output
Qn Bus
Outputs
I
I
Input Current
OFF-state
output current
Supply Current
Additional
∆I
CC
I
OL
= 4mA
I
OL
= 6.0mA
V
I
=GND to
5.5V
Qn internal high or
low.
V
o
=Vcc or Gnd
V
I
= GND or V
CC
I
O
=0
4.5V
4.5V
4.5V
5.5V
I
OZ
5.5V
±5
±5
± 10
μA
I
CC
5.5V
4.5V to
5.5V
5.5V
8.0
80
160
μA
V
I
= V
cc
-2.1V
Supply Current
I
O
=0
per Input
Input
Capacitance
V
i
= V
CC
or GND
100
450
450
490
μA
C
i
4
10
10
10
pF
Operating Characteristics
(@T
A
= +25°C°C, unless otherwise specified.)
Parameter
C
pd
Power dissipation
capacitance
Test Conditions
V
CC
= 5V
TYP
42
Unit
f = 1 MHz all outputs switching-no load
pF
74HCT595
Document number: DS35493 Rev. 3 - 2
5 of 11
www.diodes.com
July 2013
© Diodes Incorporated
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