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CD4021BC 8-Stage Static Shift Register
October 1987 Revised January 1999
CD4021BC 8-Stage Static Shift Register
General Description
The CD4021BC is an 8-stage parallel input/serial output shift register. A parallel/serial control input enables individual JAM inputs to each of 8 stages. Q outputs are available from the sixth, seventh, and eighth stages. All outputs have equal source and sink current capabilities and conform to standard "B" series output drive. When the parallel/serial control input is in the logical "0" state, data is serially shifted into the register synchronously with the positive transition of the clock. When the parallel/ serial control is in the logical "1" state, data is jammed into each stage of the register asynchronously with the clock. All inputs are protected against static discharge with diodes to VDD and VSS.
Features
s Wide supply voltage range: s High noise immunity: s Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS s 5V-10V-15V parametric ratings s Symmetrical output characteristics s Maximum input leakage 1 A at 15V over full temperature range 3.0V to 15V 0.45 VDD (typ.)
Ordering Code:
Order Number CD4021BCM CD4021BCN Order Code M16A N16E Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Body 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
Pin Assignments for DIP and SOIC
Truth Table
CL Serial (Note 1) Input X X X X X X X 0 1 X Parallel/ Qn Q1 Serial PI 1 PI n (Internal) (Note 2) Control 1 1 1 1 0 0 0 0 0 1 1 X X X 0 1 0 1 X X X 0 0 1 1 0 1 Q1 0 1 0 1 Qn-1 Qn-1 Qn
X = Don't care case Note 1: Level change Note 2: No change

X
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(c) 1999 Fairchild Semiconductor Corporation
DS005954.prf
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CD4021BC
Logic Diagram
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CD4021BC
Absolute Maximum Ratings(Note 3)
(Note 4) Supply Voltage (VDD) Input Voltage (VIN) Storage Temperature Range (TS) Power Dissipation (PD) Dual-In-Line Small Outline Lead Temperature (TL) (Soldering, 10 seconds) 260C (Note 4) 700 mW 500 mW -0.5V to +18V -0.5V to VDD +0.5V -65C to +150C
Recommended Operating Conditions (Note 4)
Supply Voltage (VDD) Input Voltage (VIN) Operating Temperature Range (TA) CD4021BCN -40C to +85C
Note 3: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. Except for "Operating Temperature Range" they are not meant to imply that the devices should be operated at these limits. The table of "Electrical Characteristics" provides conditions for actual device operation. Note 4: VSS = 0V unless otherwise specified.
3V to 15V 0 to VDD
DC Electrical Characteristics
Symbol IDD Parameter Quiescent Device Current VOL LOW Level Output Voltage VOH HIGH Level Output Voltage VIL LOW Level Input Voltage VIH HIGH Level Input Voltage IOL LOW Level Output Current (Note 5) IOH HIGH Level Output Current (Note 5) IIN Input Current
Conditions VDD = 5V, VIN = VDD or VSS VDD = 10V, VIN = VDD or VSS VDD = 15V, VIN = VDD or VSS VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V, VO = 0.5V or 4.5V VDD = 10V, VO = 1.0V or 9.0V VDD = 15V, VO = 1.5V or 13.5V VDD = 5V, VO = 0.5V or 4.5V VDD = 10V, VO = 1.0V or 9.0V VDD = 15V, VO = 1.5V or 13.5V VDD = 5V, VO = 0.4V VDD = 10V, VO = 0.5V VDD = 15V, VO = 1.5V VDD = 5V, VO = 4.6V VDD = 10V, VO = 9.5V VDD = 15V, VO = 13.5V VDD = 15V, VIN = 0V VDD = 15V, VIN = 15V |IO|< 1 A |IO| < 1 A
-40C Min Max 20 40 80 0.05 0.05 0.05 4.95 9.95 14.95 1.5 3.0 4.0 3.5 7.0 11.0 0.52 1.3 3.6 -0.52 -1.3 -3.6 -0.3 0.3 3.5 7.0 11.0 0.44 1.1 3.0 -0.44 -1.1 -3.0 4.95 9.95 14.95 Min
+25C Typ 0.1 0.2 0.3 0 0 0 5 10 15 2 4 6 3 6 9 0.88 2.2 8 -0.88 -2.2 -8 -10-5 10-5 -0.3 0.3 1.5 3.0 4.0 Max 20 40 80 0.05 0.05 0.05
+85C Min Max 150 300 600 0.05 0.05 0.05 4.95 9.95 14.95 1.5 3.0 4.0 3.5 7.0 11.0 0.36 0.90 2.4 -0.36 -0.90 -2.4 -1.0 1.0
Units A A A V V V V V V V V V V V V mA mA mA mA mA mA A A
Note 5: IOH and IOL are tested one output at a time.
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CD4021BC
AC Electrical Characteristics
Symbol tPLH, tPHL Parameter Propagation Delay Time
(Note 6)
Conditions Min Typ 240 100 70 100 50 40 2.5 5 8 3.5 10 16 100 50 40 200 100 80 15 15 15 60 40 30 25 15 10 120 80 60 50 30 20 0 10 15 150 75 50 100 50 40 5 100 250 125 100 200 100 80 7.5 Max 350 175 140 200 100 80 Units ns ns ns ns ns ns MHz MHz MHz ns ns ns s s s ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns pF pF
TA = 25C, input tr, tf = 20 ns, CL = 50 pF, RL = 200 k VDD = 5V VDD = 10V VDD = 15V tTHL, tTLH Transition Time VDD = 5V VDD = 10V VDD = 15V fCL Maximum Clock Input Frequency tW Minimum Clock Pulse Width trCL, tfCL Clock Rise and Fall Time (Note 6) ts Minimum Set-Up Time Serial Input tH 200 ns (Ref. to CL) Parallel Inputs tH 200 ns (Ref. to P/S) tH Minimum Hold Time Parallel/Serial Control tWH Minimum P/S Pulse Width tREM Minimum P/S Removal Time (Ref. to CL) CI CPD Average Input Capacitance Power Dissipation Capacitance (Note 8)
Note 6: AC Parameters are guaranteed by DC correlated testing. Note 7: If more than one unit is cascaded trCL should be made less than or equal to the fixed propagation delay of the output of the driving stage for the estimated capacitive load. Note 8: CPD determines the no load AC power consumption of any CMOS device. For complete explanation, see 74C family characteristics application note AN-90.
VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 15V VDD = 5V VDD = 10V VDD = 15V VDD = 5V VDD = 10V VDD = 15V Any Input
Serial In, Parallel In, ts 400 ns VDD = 10V
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CD4021BC
Typical Performance Characteristics
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CD4021BC
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Body Package Number M16A
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CD4021BC 8-Stage Static Shift Register
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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