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| SN74LS395 4-BIT SHIFT REGISTER WITH 3-STATE OUTPUTS The SN74LS395 is a 4-Bit Register with 3-state outputs and can operate in either a synchronous parallel load or a serial shift-right mode, as determined by the Select input. An asynchronous active LOW Master Reset (MR) input overrides the synchronous operations and clears the register. An active HIGH Output Enable (OE) input controls the 3-state output buffers, but does not interfere with the other operations. The fourth stage also has a conventional output for linking purposes in multi-stage serial operations. 4-BIT SHIFT REGISTER WITH 3-STATE OUTPUTS LOW POWER SCHOTTKY * Shift Left or Parallel 4-Bit Register * 3-State Outputs * Input Clamp Diodes Limit High-Speed Termination Effects J SUFFIX CERAMIC CASE 620-09 16 1 CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 O0 15 O1 14 O2 13 O3 12 Q3 11 CP 10 OE 9 16 1 N SUFFIX PLASTIC CASE 648-08 1 MR 2 DS 3 P0 4 P1 5 P2 6 P3 7 S 8 GND 16 1 D SUFFIX SOIC CASE 751B-03 PIN NAMES LOADING (Note a) HIGH LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 15 U.L. 5 U.L. P0 - P3 DS S CP MR OE O0 - O3 Q3 Parallel Inputs Serial Data Input Mode Select Input Clock (Active LOW) Input Master Reset (Active LOW) Input Output Enable (Active HIGH) Input 3-State Register Outputs Register Output 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 65 U.L. 10 U.L. ORDERING INFORMATION SN74LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC LOGIC SYMBOL 734 5 6 NOTES: a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW. S P0 P1 P2 P3 2 10 9 DS CP OE MR O0 O1 O2 O3 Q3 11 1 15 14 13 12 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 5-1 SN74LS395 LOGIC DIAGRAM S Ds P0 P1 P2 P3 CP CP CD MR D Q CP CD D Q CP CD D Q CP CD D Q OE O0 O1 O2 O3 Q3 FUNCTION DESCRIPTION The SN74LS395 contains four D-type edge-triggered flip-flops and auxiliary gating to select a D input either from a Parallel (Pn) input or from the preceding stage. When the Select input is HIGH, the Pn inputs are enabled. A LOW signal on the S input enables the serial inputs for shift-right operations, as indicated in the Truth Table. State changes are initiated by HIGH-to-LOW transitions on the Clock Pulse (CP) input. Signals on the Pn, Ds and S inputs can change when the Clock is in either state, provided that the recommended set-up and hold times are observed. When the S input is LOW, a CP HIGH-LOW transition transfers data in Q0 to Q1, Q1 to Q2, and Q2 to Q3. A left-shift is accomplished by connecting the outputs back to the Pn inputs, but offset one place to the left, i.e., O3 to P2, O2 to P1 and O1 to P0, with P3 acting as the linking input from another package. When the OE input is HIGH, the output buffers are disabled and the Q0 - Q3 outputs are in a high impedance condition. The shifting, parallel loading or resetting operations can still be accomplished, however. MODE SELECT -- TRUTH TABLE Inputs @ tn Operating Mode Asynchronous Reset Shift, SET First Stage Shift, RESET First Stage Parallel Load H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial tn, n + 1 = time before and after CP HIGH-to-LOW transition NOTE: When OE is HIGH, outputs O0 - O3 are in the high impedance state; however, this does not affect other operations or the Q3 output. Outputs @ tn+1 Ds X H L X Pn X X X Pn O0 L H L P0 O1 L O0n O0n P1 O2 L O1n O1n P2 O3 L O2n O2n P3 MR L H H H CP X S X L L H GUARANTEED OPERATING RANGES Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter Min 4.75 0 Typ 5.0 25 Max 5.25 70 - 0.4 8.0 Unit V C mA mA FAST AND LS TTL DATA 5-2 SN74LS395 DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Limits Symbol S bl VIH VIL VIK VOH Parameter P Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage 2.7 - 0.65 3.5 0.25 VOL IOZH IOZL IIH IIL IOS Output LOW Voltage 0.35 Output Off Current HIGH Output Off Current LOW Input HIGH Current - 0.1 Input LOW Current Short Circuit Current (Note 1) Power Supply Current Total, Output HIGH ICC Total, Output LOW 34 mA - 20 - 0.4 - 100 31 0.5 20 - 20 20 V A A A mA mA mA mA 0.4 Min 2.0 0.8 - 1.5 Typ Max Unit Ui V V V V V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table IOL = 4.0 mA IOL = 8.0 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table VCC = MAX, VO = 2.4 V VCC = MAX, VO = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX VCC = MAX, OE = GND, CP = GND VCC = MAX, OE = 4.5 V, CP momentary 3.0 V then GND Note 1: Not more than one output should be shorted at a time, nor for more than 1 second. AC CHARACTERISTICS (TA = 25C) Limits Symbol S bl fMAX tPHL tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter P Maximum Input Clock Frequency Propagation Delay, Clear to Output Propagation Delay, Low to High Propagation Delay, High to Low Output Enable Time Output Disable Time Min 30 Typ 45 22 15 25 15 17 12 11 35 30 30 25 25 20 17 Max Unit Ui MHz ns ns ns ns CL = 5.0 pF VCC = 5.0 V 50 CL = 15 pF Test C di i T Conditions AC SETUP REQUIREMENTS (TA = 25C) Limits Symbol S bl tW ts ts th Parameter P Clock Pulse Width Setup Time, Mode Select Setup Time, All Others Data Hold Time Min 16 40 20 10 Typ Max Unit Ui ns ns ns ns VCC = 5 0 V 5.0 Test C di i T Conditions FAST AND LS TTL DATA 5-3 SN74LS395 AC WAVEFORMS The shaded areas indicate when the input is permitted to change for predictable output performance. D * ts(L) CP OR MR Q 1.3 V tPHL 1.3 V 1/fmax tW tPLH CP 1.3 V th(L) ts(H) 1.3 V ts(L) th(L) ts(H) 1.3 V th(H) 1.3 V th(H) S LOAD SERIAL DATA SHIFT RIGHT 1.3 V LOAD PARALLEL DATA 1.3 V *The Data Input is DS for S = LOW and Pn for S = HIGH. Figure 1 Figure 2 VE 1.3 V tPZL 1.3 V tPLZ 1.3 V VOL 0.5 V VE 1.3 V tPZH tPHZ 1.3V VOH 1.3 V 0.5 V VOUT 1.3 V VOUT 1.3 V Figure 3 Figure 4 AC LOAD CIRCUIT VCC RL SYMBOL SW1 tPZH tPZL TO OUTPUT UNDER TEST tPLZ tPHZ 5 k CL* SW2 SWITCH POSITIONS SW1 Open Closed Closed Closed SW2 Closed Open Closed Closed * Includes Jig and Probe Capacitance. Figure 5 FAST AND LS TTL DATA 5-4 |
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