XBLW CD4021
8-Bit Static Shift Register
General Description
The CD4021 is an 8-bit static shift register (parallel-to-serial converter) with a synchronous serial data input
(DS), a clock input (CP), an asynchronous active HIGH parallel load input (PL), eight asynchronous parallel data
inputs (D0 to D7) and buffered parallel outputs from the last three stages (Q5 to Q7). Each register stage is a D-type
master-slave flip-flop with a set direct (SD) and clear direct (CD) input. Information on D0 to D7 is asynchronously
loaded into the register while PL is HIGH, independent of CP and DS. When PL is LOW, data on DS is shifted into
the first register position and all the data in the register is shifted one position to the right on the LOW-to-HIGH
transition of CP. Schmitt trigger action makes the clock input highly tolerant of slower rise and fall times.
It operates over a recommended VDD power supply range of 3V to 15V referenced to VSS (usually ground).
Unused inputs must be connected to VDD, VSS, or another input.
Features
Tolerant of slower rise and fall times
Fully static operation
5V, 10V, and 15V parametric ratings
Standardized symmetrical output characteristics
Specified from -40℃ to +105℃
Packaging information: DIP16/SOP16/TSSOP16
ORDERING INFORMATION
DEVICE
Package Type
MARKING
Packing
Packing QTY
CD4021BE
CD4021BDTR
CD4021BTDTR
DIP-16
SOP-16
TSSOP-16
CD4021BE
CD4021B
CD4021B
Tube
Tape
Tape
1000/Box
2500/Reel
3000/Reel
XBLW version 1.0
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第 1 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Block Diagram And Pin Description
Block Diagram
Figure 1. Functional diagram
Figure 2. Logic diagram
XBLW version 1.0
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第 2 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Pin Configurations
Pin Description
Pin No.
Pin Name
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
D7
Q5
Q7
D3
D2
D1
D0
VSS
PL
CP
DS
Q6
D4
D5
D6
VDD
parallel data input
buffered parallel output from the last three stages
buffered parallel output from the last three stages
parallel data input
parallel data input
parallel data input
parallel data input
ground supply voltage
parallel load input
clock input (LOW-to-HIGH edge-triggered)
serial data input
buffered parallel output from the last three stages
parallel data input
parallel data input
parallel data input
supply voltage
XBLW version 1.0
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第 3 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Function Table
Number of
clock transitions
Inputs
DS
CP
Serial operation
1
2
3
6
7
8
Outputs
Q6
PL
Q5
X
X
X
data 1
data 2
data 3
no change
data 1
data 2
no change
data 1
no change
D5
D6
D7
↑
↑
↑
↑
↑
↑
↓
data 1
data 2
data 3
X
X
X
X
L
L
L
L
L
L
L
X
X
H
Q7
X
X
X
X
X
X
X
X
X
Parallel operation
Note:
[1] H=HIGH voltage level; L=LOW voltage level; X=don’t care;
↑=LOW to HIGH clock transition; ↓=HIGH to LOW clock transition;
data n=data (HIGH or LOW) on the DS input at the nth ↑ CP transition.
Electrical Parameter
Absolute Maximum Ratings (Tamb=25℃, unless otherwise specified.)
Characteristic
Symbol
Conditions
Min.
supply voltage
input clamping current
input voltage
output clamping current
input/output current
supply current
operating temperature
storage temperature
total power dissipation
power dissipation
VDD
IIK
VI
IOK
II/O
IDD
Tamb
Tstg
Ptot
PD
-0.5
-0.5
-40
-65
soldering temperature
TL
VI < -0.5V or VI > VDD +0.5V
VI < -0.5V or VI > VDD +0.5V
per output
DIP
10s
SOP/TSSOP
XBLW version 1.0
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Max.
Unit
+18
±10
VDD +0.5
±10
±10
50
+105
+150
500
100
245
260
V
mA
V
mA
mA
mh
℃
℃
mW
mW
℃
℃
第 4 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Recommended Operating Conditions
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
supply voltage
input voltage
operating temperature
VDD
VI
Tamb
-
3
0
-40
-
15
VDD
+105
V
V
℃
Electrical Characteristics
DC Characteristics 1 (Tamb=25℃, voltages are referenced to VSS (ground=0V), unless otherwise specified.)
Parameter
supply current
LOW-level
output current
HIGH-level
output current
LOW-level
output voltage
HIGH-level
output voltage
LOW-level
input voltage
Symbol
IDD
IOL
IOH
VOL
VOH
VIL
VO
Conditions(V)
VIN
VDD
Min.
Tamb=25℃
Typ.
Max.
Unit
-
0, 5
5
-
-
5
μA
-
0, 10
10
-
-
10
μA
-
0, 15
15
-
-
20
μA
0.4
0, 5
5
0.5
-
-
mA
0.5
0, 10
10
1.3
-
-
mA
1.5
0, 15
15
3.4
-
-
mA
4.6
0, 5
5
-
-
-0.5
mA
2.5
0, 5
5
-
-
-1.4
mA
9.5
0, 10
10
-
-
-1.3
mA
13.5
0, 15
15
-
-
-3.4
mA
-
0, 5
5
-
-
0.05
V
-
0, 10
10
-
-
0.05
V
-
0, 15
15
-
-
0.05
V
-
0, 5
5
4.95
-
-
V
-
0, 10
10
9.95
-
-
V
-
0, 15
15
14.95
-
-
V
4.5
-
5
-
-
1.5
V
9
-
10
-
-
3
V
13.5
-
15
-
-
4
V
0.5, 4.5
-
5
3.5
-
-
V
1, 9
-
10
7
-
-
V
1.5, 13.5
-
15
11
-
-
V
HIGH-level
input voltage
VIH
input leakage
current
II
-
0, 15
15
-
-
±1.0
μA
input
capacitance
CI
-
-
-
-
-
7.5
pF
XBLW version 1.0
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第 5 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
DC Characteristics 2
(Tamb=-40℃ to +105℃, voltages are referenced to VSS (ground=0V), unless otherwise specified.)
Parameter
supply
current
Symbol
IDD
LOW-level
output
current
IOL
HIGH-level
output
current
IOH
LOW-level
output
voltage
VOL
HIGH-level
output
voltage
VOH
LOW-level
input voltage
VIL
HIGH-level
input voltage
VIH
input leakage
current
II
XBLW version 1.0
Conditions(V)
VO
VIN VDD
Tamb=-40℃
Min.
Max.
Tamb=+85℃
Min. Max.
Tamb=+105℃
Min. Max.
Unit
-
0, 5
5
-
5
-
150
-
15
μA
-
0, 10
10
-
10
-
300
-
300
μA
-
0, 15
15
-
20
-
600
-
600
μA
0.4
0.5
1.5
4.6
2.5
9.5
13.5
4.5
9
13.5
0.5, 4.5
1, 9
1.5, 13.5
0, 5
0, 10
0, 15
0, 5
0, 5
0, 10
0, 15
0, 5
0, 10
0, 15
0, 5
0, 10
0, 15
-
5
10
15
5
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
0.64
1.6
4.2
4.95
9.95
14.95
3.5
7
11
-0.64
-1.7
-1.6
-4.2
0.05
0.05
0.05
1.5
3
4
-
0.36
0.9
2.4
4.95
9.95
14.95
3.5
7
11
-0.36
-1.1
-0.9
-2.4
0.05
0.05
0.05
1.5
3
4
-
0.36
0.9
2.4
4.95
9.95
14.95
3.5
7
11
-0.36
-1.1
-0.9
-2.4
0.05
0.05
0.05
1.5
3
4
-
mA
mA
mA
mA
mA
mA
mA
V
V
V
V
V
V
V
V
V
V
V
V
-
0, 15
15
-
±0.1
-
±1.0
-
±1.0
μA
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第 6 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
AC Characteristics (Tamb=25℃, VSS=0V, unless otherwise specified.)
Parameter
HIGH to LOW
propagation delay
Symbol
Conditions
CP to Qn;
see Figure 4
tPHL
PL to Qn;
see Figure 4
CP to Qn;
see Figure 4
LOW to HIGH
propagation delay
tPLH
transition time
tt
PL to Qn;
see Figure 4
Qn; see Figure 4
DS to CP;
see Figure 5
set-up time
tSU
Dn to PL;
see Figure 6
DS to CP;
see Figure 5
hold time
th
Dn to PL;
see Figure 6
CP=LOW;
minimum width;
see Figure 5
pulse width
tW
recovery time
trec
PL input;
see Figure 6
maximum clock
frequency
Fclk(max)
CP input;
see Figure 5
XBLW version 1.0
PL=HIGH;
minimum width;
see Figure 6
VDD
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
Min.
+25
+25
+15
50
30
20
40
20
15
+15
15
15
70
30
24
70
30
24
50
40
35
-
Typ.
125
55
40
135
78
65
115
50
40
135
78
72
60
30
20
+4
0
0
-11
-7
-3
8
3
0
-13
-9
-4
35
15
12
35
15
12
10
5
5
13
30
40
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Max.
250
110
80
240
110
80
230
100
80
210
100
80
120
60
40
-
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
MHz
MHz
MHz
第 7 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Testing Circuit
AC Testing Circuit
Definitions for test circuit:
Figure 3. Test circuit for switching times
DUT=Device Under Test
CL=Load capacitance including jig and probe capacitance.
RT=Termination resistance should be equal to the output impedance Zo of the pulse generator.
AC Testing Waveforms
Figure 4. Waveforms showing propagation delays for CP and PL inputs to Qn output and Qn transition times
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第 8 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Figure 5. Waveforms showing minimum clock pulse width, set-up time, and hold time for CP and DS.
Figure 6. Waveforms showing minimum pulse width and recovery time for PL; set-up and hold times for Dn to PL.
Measurement Points
Supply voltage
VDD
5V to 15V
Input
VM
0.5×VDD
Output
VX
0.1×VDD
VM
0.5×VDD
VY
0.9×VDD
Test Data
Supply voltage
VDD
VI
tr, tf
Load
CL
5V to 15V
VSS or VDD
≤20ns
50pF
XBLW version 1.0
Input
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第 9 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Package Information
DIP16
Symbol
A2
A1
A
L
b
B1
D
E1
e
c
eB
XBLW version 1.0
Min.
Dimensions(mm)
3.20
0.51
3.60
3.00
0.36
Max.
3.60
5.33
3.60
0.56
1.52
18.80
6.20
19.94
6.60
2.54
0.20
7.62
0.36
9.30
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第 10 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
SOP16
Symbol
A1
A2
b
c
D
E
E1
e
L
θ
XBLW version 1.0
Min.
Dimensions (mm)
0.10
1.25
0.33
0.19
9.50
5.80
3.70
Max.
0.25
1.55
0.51
0.25
10.10
6.30
4.10
1.27
0.35
0°
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0.89
8°
第 11 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
TSSOP16
SYMBOL
A
A1
A2
b
c
D
E1
E
e
L
θ
XBLW version 1.0
MILLIMETER
MIN
0.05
0.80
0.19
0.09
4.90
4.30
6.20
MAX
1.20
0.15
1.05
0.30
0.20
5.10
4.50
6.60
0.65
0.45
0°
0.75
8°
文档仅供参考,实际应用测试为准
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第 12 页 共 13 页
XBLW CD4021
8-Bit Static Shift Register
Statements And Notes
Part name
Lead and
lead
compounds
Lead frame
○
Plastic resin
○
○
○
○
○
○
Chip
○
○
○
○
○
The lead
Plastic sheet
installed
○
○
○
○
○
○
○
○
○
○
explanation
Cadmium
and
cadmium
compounds
○
Hazardous substances or Elements
Polybro
Hexavalent
Polybro
minated
Dibutyl
chromium
minated
biphenyl
phthalate
compounds biphenyls
ethers
○
○
○
○
Mercury
and
mercury
compounds
○
Butyl
benzyl
phthalate
Di-2ethylhexyl
phthalate
Diisobutyl
phthalate
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○: Indicates that the content of hazardous substances or elements in the detection limit of the following the SJ/T11363-2006 standard.
×: Indicates that the content of hazardous substances or elements exceeding the SJ/T11363-2006 Standard limit requirements
Statement:
Shenzhen xinbole electronics co., ltd. reserves the right to change the product specifications, without notice!
Before placing an order, the customer needs to confirm whether the information obtained is the latest version,
and verify the integrity of the relevant information.
Any semiconductor product is liable to fail or malfunction under certain conditions, and the buyer shall be
responsible for complying with safety standards in the system design and whole machine manufacturing using
Shenzhen xinbole electronics co., ltd products, and take appropriate security measures to avoid the potential risk
of failure may result in personal injury or property losses of the situation occurred!
Product performance is never ending, Shenzhen xinbole electronics co., ltd will be dedicated to provide
customers with better performance, better quality of integrated circuit products.
XBLW version 1.0
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第 13 页 共 13 页