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TECHNICAL DATA
IN74HC166
8-Bit Serial or Parallel-Input/ Serial-Output Shift Register
High-Performance Silicon-Gate CMOS
The IN74HC166 is identical in pinout to the LS/ALS166. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. This device is a parallel-in or serial-in, serial-out shift register with gated clock inputs and an overriding clear input. The shift/load input establishes the parallel-in or serial-in mode. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse. Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled. Serial data flow is inhibited during parallel loading. Clocking is done on the low-to-high level edge of the clock pulse via a two input positive NOR gate, which permits one input to be used as a clock enable or clock inhibit function. Clocking is inhibited when either of the clock inputs are held high, holding either input low enables the other clock input. This will allow the system clock to be free running and the register stopped on command with the other clock input. A change from low-to-high on the clock inhibit input should only be done when the clock input is high. A buffered direct clear input overrides all other inputs, including the clock, andsets all flip-flop to zero. * Outputs Directly Interface to CMOS, NMOS, and TTL * Operating Voltage Range: 2.0 to 6.0 V * Low Input Current: 1.0 A * High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION IN74HC166N Plastic IN74HC166D SOIC TA = -55 to 125 C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC PIN 8 = GND
235
IN74HC166
MAXIMUM RATINGS*
Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL
*
Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package)
Value -0.5 to +7.0 -1.5 to VCC +1.5 -0.5 to VCC +0.5 20 25 50 750 500 -65 to +150 260
Unit V V V mA mA mA mW C C
Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. +Derating - Plastic DIP: - 10 mW/C from 65 to 125C SOIC Package: : - 7 mW/C from 65 to 125C
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VIN, VOUT TA tr, tf Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) Operating Temperature, All Package Types Input Rise and Fall Time (Figure 1) VCC =2.0 V VCC =4.5 V VCC =6.0 V Min 2.0 0 -55 0 0 0 Max 6.0 VCC +125 1000 500 400 Unit V V C ns
This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND(VIN or VOUT)VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open.
236
IN74HC166
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
VCC Symbol Parameter Test Conditions V Guaranteed Limit 25 C to -55C 1.5 3.15 4.2 0.3 0.9 1.2 1.9 4.4 5.9 3.98 5.48 0.1 0.1 0.1 0.26 0.26 0.1 8.0 85 C 1.5 3.15 4.2 0.3 0.9 1.2 1.9 4.4 5.9 3.84 5.34 0.1 0.1 0.1 0.33 0.33 1.0 80 125 C 1.5 3.15 4.2 0.3 0.9 1.2 1.9 4.4 5.9 3.7 5.2 0.1 0.1 0.1 0.4 0.4 1.0 160 A A V Unit
VIH
Minimum High-Level Input Voltage Maximum Low Level Input Voltage Minimum High-Level Output Voltage
VOUT=0.1 V or VCC-0.1 V IOUT 20 A VOUT=0.1 V or VCC-0.1 V IOUT 20 A VIN=VIH or VIL IOUT 20 A VIN=VIH or VIL IOUT 4.0 mA IOUT 5.2 mA
2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 6.0 6.0
V
VIL
V
VOH
V
VOL
Maximum Low-Level Output Voltage
VIN=VIH or VIL IOUT 20 A VIN=VIH or VIL IOUT 4.0 mA IOUT 5.2 mA
IIN ICC
Maximum Input Leakage Current Maximum Quiescent Supply Current (per Package)
VIN=VCC or GND VIN=VCC or GND IOUT=0A
FUNCTION TABLE
Inputs Clear L H H H H H Shift/Load X X L H H X Clock Inhibit X X L L L H X Clock X SA X X X H L X Parallel A...H X X a...h X X X a H L Internal Outputs QA L QB L No change b QAn QAn No change h QGn QGn Output QH L
X = don't care a...h = the level of steady state input voltage at input A trough H respectively
237
IN74HC166
AC ELECTRICAL CHARACTERISTICS(CL=50pF,Input tr=tf=6.0 ns)
VCC Symbol Parameter V Guaranteed Limit 25 C to -55C 6.0 31 36 140 28 24 150 30 26 75 16 14 10 85C 125C Unit
fmax
Minimum Clock Frequency (50% Duty Cycle) (Figures 2 and 4) Maximum Propagation Delay, Clock (or Clock Inhibit) to QH (Figures 2,3 and 4) Maximum Propagation Delay , Clear to QH (Figures 1 and 4) Maximum Output Transition Time, Any Output (Figures 1 and 4) Maximum Input Capacitance Power Dissipation Capacitance (Per Package)
2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 -
5.0 25 28 175 35 30 200 40 34 95 20 18 10
4.2 21 25 210 42 36 230 48 40 110 25 20 10
MHz
tPLH, tPHL
ns
tPHL
ns
tTLH, tTHL
ns
CIN
pF
Typical @25C,VCC=5.0 V 140 pF
CPD
Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC
TIMING REQUIREMENTS(CL=50pF,Input tr=tf=6.0 ns)
VCC Symbol tsu Parameter Minimum Setup Time, Shift/Load to Clock (Figure 3) Minimum Setup Time, Data before Clock (or Clock Inhibit) (Figure 3) Minimum Pulse Width, Clock (or Clock Inhibit) (Figure 2) V 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 Guaranteed Limit 25 C to -55C 80 16 14 80 16 14 80 16 14 85C 100 20 18 100 20 18 100 20 17 125C 120 24 20 120 24 20 120 24 20 Unit ns
tsu
ns
tw
ns
238
IN74HC166
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
Figure 3. Switching Waveforms
Figure 4. Test Circuit
239
IN74HC166
TIMING DIAGRAM
EXPANDED LOGIC DIAGRAM
240

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