74HC595 Datasheet PDF - Diodes


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74HC595
Diodes

Part Number 74HC595
Description 8-BIT SHIFT REGISTER
Page 11 Pages

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74HC595
8-BIT SHIFT REGISTER WITH 8-BIT OUTPUT REGISTER
Description
The 74HC595 is an high speed CMOS device.
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.
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 (OEasserted 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.
Pin Assignments
Features
Wide Supply Voltage Range from 2.0V to 6.0V
Sinks or sources 8mA at VCC = 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:
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
<1000ppm antimony compounds.
Click here for ordering information, located at the end of datasheet
74HC595
Document number: DS35492 Rev. 3 - 2
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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
Function
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
Logic Diagram
Functional Diagram
74HC595
74HC595
Document number: DS35492 Rev. 3 - 2
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74HC595
Functional Description and Timing Diagram
Control
Input
SHCP STCP OE MR
DS
XX L L
XL L
XXH L
X LH
XLH
 LH
Output
Q7S
Qn
L NC
LL
LZ
Q6S
NC
NC
Q6S
QnS
QnS
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.
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
74HC595
Document number: DS35492 Rev. 3 - 2
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74HC595
Absolute Maximum Ratings (Note 4) (@TA = +25°C, unless otherwise specified.)
Symbol
Description
Rating
Unit
ESD HBM
Human Body Model ESD Protection
2 kV
ESD CDM
Charged Device Model ESD Protection
1 kV
ESD MM
Machine Model ESD Protection
200 V
VCC Supply Voltage Range
-0.5 to +7.0
V
VI Input Voltage Range
-0.5 to +7.0
V
Vo Voltage applied to output in high or low state
-0.3 to VCC +0.5
V
IIK Input Clamp Current VI < -0.5V
-20 mA
IIK Input Clamp Current VI > Vcc +0.5V
20 mA
IOK Output Clamp Current VO <-0.5V
-20 mA
IOK Output Clamp Current VO > VCC +0.5V
20 mA
Q7 standard output
IO Continuous output current
Qn bus driver outputs
±25 mA
±35 mA
ICC Continuous current through Vdd or GND
70 mA
IGND
Continuous current through Vdd or GND
-70 mA
TJ Operating Junction Temperature
-40 to +150
°C
TSTG
Storage Temperature
-65 to +150
°C
PTOT
Total Power Dissipation
500 mW
Note:
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) (@TA = +25°C, unless otherwise specified.)
Symbol
VCC
VI
VO
Δt/ΔV
TA
Parameter
Supply Voltage
Input Voltage
Output Voltage
Input transition rise or fall rate
Operating free-air temperature
Active Mode
VCC = 2.0V
VCC = 4.5V
VCC = 6.0V
Note:
5. Unused inputs should be held at VCC or Ground.
Conditions
Min Max
2.0 6.0
0 VCC
0 VCC
1000
500
400
-40 +125
Unit
V
V
V
ns/V
°C
74HC595
Document number: DS35492 Rev. 3 - 2
4 of 11
www.diodes.com
June 2013
© Diodes Incorporated




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