SL74LS164 SLS | Alldatasheet
Document overview
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Technical content
8-Bit Serial-Input/Parallel-Output Shift Register This 8 -bit shift register features gated serial inputs and an asynchronous reset. The gated serial inputs (A and B) permit complete control over incoming data as a low at either (or both) input(s) inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse. A high level input enables the other input which will then determine the state of the first flip -flop. Data at the serial inputs may be changed while the clock is high or low, but only information meeting the setup requirements will be entered clocking occurs or the low-to-high level transition of the clock input. All inpu ts are diode - clamped to minimize transmission-line effects.
- Gated (Enable/Disable) Serial Inputs
- Fully Buffered Clock and Serial Inputs
- Asynchronous Clear
ORDERING INFORMATION
TA =0° to 70°C for all packages PIN ASSIGNMENT FUNCTION TABLE Inputs Outputs Reset Clock A1 A2 QA QB ... QH L X X X L L ... L H X X no change H H D D QAn ... QGn H D H D QAn ... QGn H L L L QAn ... QGn D = data input X = don’t care QAn - QGn = data shifted from the previous stage on a rising edge at the clock input. LOGIC DIAGRAM PIN 14 =VCC PIN 7 = GND
MAXIMUM RATINGS* Symbol Parameter Value Unit VCC Supply Voltage 7.0 V VIN Input Voltage 7.0 V VOUT Output Voltage 5.5 V Tstg Storage Temperature Range -65 to +150 °C *Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit VCC Supply Voltage 4.75 5.25 V VIH High Level Input Voltage 2.0 V VIL Low Level Input Voltage 0.8 V IOH High Level Output Current -0.4 mA IOL Low Level Output Current 8.0 mA TA Ambient Temperature Range 0 +70 °C fclock Clock Frequency 0 25 MHz tsu Setup Time, A1 or A2 to Clock 15 ns th Hold Time, Clock to A1 or A2 5 ns tw Pulse Width, Clock 20 ns tw Pulse Width, Reset 20 ns trec Recovery Time 5 ns DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol Parameter Test Conditions Min Max Unit VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V VOH High Level Output Voltage VCC = min, IOH = -0.4 mA 2.7 V VOL Low Level Output Voltage VCC = min, IOL = 4 mA 0.4 V VCC = min, IOL = 8 mA 0.5 IIH High Level Input Current VCC = max, VIN = 2.7 V 20 mA VCC = max, VIN = 7.0 V 0.1 mA IIL Low Level Input Current VCC = max, VIN = 0.4 V -0.4 mA IO Output Short Circuit Current VCC = max, VO = 0 V (Noote 1) -20 -100 mA ICC Supply Current VCC = max (Note 2) 27 mA Note 1: Not more than one output should be shorted at a time, an d duration should not exceed one second.