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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
73 4 5 6
NOTES: a) 1 TTL Unit Load (U.L.) = 40 A HIGH/1.6 mA LOW.
2 10 9
DS CP OE
S P0 P1 P2 P3 Q3 MR O0 O1 O2 O3 11
1 15 14 13 12 VCC = PIN 16 GND = PIN 8
FAST AND LS TTL DATA 5-551
SN74LS395
LOGIC DIAGRAM
S Ds P0 P1 P2 P3
CP CP D Q CP D Q CP D Q CP D Q
CD MR
CD
CD
CD
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 5-552
SN74LS395
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol VIH VIL VIK VOH Parameter 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 V V V V V Test 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 fMAX tPHL tPLH tPHL tPZH tPZL tPLZ tPHZ Parameter 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 MHz ns ns ns ns CL = 5.0 pF VCC = 5.0 V CL = 15 pF Test Conditions
AC SETUP REQUIREMENTS (TA = 25C)
Limits Symbol tW ts ts th Parameter Clock Pulse Width Setup Time, Mode Select Setup Time, All Others Data Hold Time Min 16 40 20 10 Typ Max Unit ns ns ns ns VCC = 5.0 V Test Conditions
FAST AND LS TTL DATA 5-553
SN74LS395
AC WAVEFORMS The shaded areas indicate when the input is permitted to change for predictable output performance.
D * 1.3 V 1.3 V
LOAD SERIAL DATA SHIFT RIGHT
th(H) S 1.3 V
ts(L)
th(L)
LOAD PARALLEL DATA
1.3 V
ts(H)
CP OR MR
1.3 V tW tPHL 1/fmax
1.3 V ts(L) tPLH CP 1.3 V th(L) ts(H) th(H)
Q
1.3 V
*The Data Input is DS for S = LOW and Pn for S = HIGH.
Figure 1
Figure 2
VE
1.3 V
1.3 V
VE tPLZ
1.3 V tPZH
1.3V tPHZ
tPZL VOUT 1.3 V
1.3 V
VOL 0.5 V
VOUT
1.3 V
VOH 1.3 V
0.5 V
Figure 3
Figure 4
AC LOAD CIRCUIT
VCC
RL
SWITCH POSITIONS
SYMBOL SW1 Open Closed Closed Closed SW2 Closed Open Closed Closed
SW1
tPZH tPZL
TO OUTPUT UNDER TEST
tPLZ tPHZ
5 k
CL*
SW2
* Includes Jig and Probe Capacitance.
Figure 5
FAST AND LS TTL DATA 5-554
-A-
Case 751B-03 D Suffix 16-Pin Plastic SO-16
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: MILLIMETER. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. 751B 01 IS OBSOLETE, NEW STANDARD 751B 03.
16
9
-B1 8
P
8 PL
0.25 (0.010)
M
B
M
R X 45 G -TD 16 PL
0.25 (0.010)
M
C
SEATING PLANE
K
T B
S
M
F
J
A
S
DIM A B C D F G J K M P R
MILLIMETERS MIN MAX
9.80 3.80 1.35 0.35 0.40 10.00 4.00 1.75 0.49 1.25
INCHES MIN MAX
0.386 0.150 0.054 0.014 0.016 0.393 0.157 0.068 0.019 0.049
1.27 BSC 0.19 0.10 0 5.80 0.25 0.25 0.25 7 6.20 0.50
0.050 BSC 0.008 0.004 0 0.229 0.010 0.009 0.009 7 0.244 0.019
Case 648-08 N Suffix 16-Pin Plastic -A16 9
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. 3. CONTROLLING DIMENSION: INCH. DIMENSION L" TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B" DOES NOT INCLUDE MOLD FLASH. 5. 6. ROUNDED CORNERS OPTIONAL. 648 01 THRU 07 OBSOLETE, NEW STANDARD 648 08.
B
1 8
F S
C -TK
SEATING PLANE
L
H G D 16 PL
0.25 (0.010)
M
J
M
T
A
M
DIM A B C D F G H J K L M S
MILLIMETERS MIN MAX
18.80 6.35 3.69 0.39 1.02 19.55 6.85 4.44 0.53 1.77
INCHES MIN MAX
0.740 0.250 0.145 0.015 0.040 0.770 0.270 0.175 0.021 0.070
2.54 BSC 1.27 BSC 0.21 2.80 7.50 0 0.51 0.38 3.30 7.74 10 1.01
0.100 BSC 0.050 BSC 0.008 0.110 0.295 0 0.020 0.015 0.130 0.305 10 0.040
-A16 9
Case 620-09 J Suffix 16-Pin Ceramic Dual In-Line
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH.
-B1 8
3. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 4. DIM F MAY NARROW TO 0.76 (0.030) WHERE THE LEAD ENTERS THE CERAMIC BODY.
C
L
5. 620 01 THRU 08 OBSOLETE, NEW STANDARD 620 09.
-TSEATING PLANE
K E F D 16 PL
0.25 (0.010)
M
N G
T A
S
M J 16 PL
0.25 (0.010)
M
T
B
S
DIM A B C D E F G J K L M N
MILLIMETERS MIN MAX
19.05 6.10 19.55 7.36 4.19 0.39 0.53
INCHES MIN MAX
0.750 0.240 0.770 0.290 0.165 0.015 0.021
1.27 BSC 1.40 1.77
0.050 BSC 0.055 0.070
2.54 BSC 0.23 0.27 5.08 7.62 BSC 0 0.39 15 0.88
0.100 BSC 0.009 0.011 0.200 0.300 BSC 0 0.015 15 0.035
FAST AND LS TTL DATA 5-555
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FAST AND LS TTL DATA 5-556

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