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TRI-STATE OCTAL BUFFERS
The SN54 / 74LS795 thru SN54 / 74LS798 device types provide a second source for the 71 / 81LS95 thru 71 / 81LS98 series. These devices are octal low power Schottky versions of the 70/8095 thru 70/8098 3-STATE Hex Buffers. The LS795 and LS797 are noninverting and the LS796 and LS798 are inverting functions. On each buffer, one of the two inputs is used as a control line to gate the output into the high impedance state, while the other input passes the data through the buffer. On the LS795 and LS796 access is through a 2-input NOR gate, with all eight 3-STATE enable lines common. On the LS797 and LS798, four buffers are enabled from one common line and the other four buffers from another common line. On all device types the 3-STATE condition is achieved by applying a high logic level to the enable pins. TRUTH TABLES LS795
INPUTS G1 H X L L G2 X H L L A X X H L OUTPUT Y Z Z H L
SN54/74LS795 SN54/74LS796 SN54/74LS797 SN54/74LS798
TRI-STATE OCTAL BUFFERS
LOW POWER SCHOTTKY
LS796
INPUTS G1 H X L L G2 X H L L A X X H L OUTPUT Y Z Z L H
20 1
J SUFFIX CERAMIC CASE 732-03
20 1
N SUFFIX PLASTIC CASE 738-03
LS797
INPUTS G H L L A X H L OUTPUT Y Z H L
LS798
INPUTS G H L L A X H L OUTPUT Y Z L H
20 1
DW SUFFIX SOIC CASE 751D-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXDW SOIC
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Supply Voltage Operating Ambient Temperature Range Output Current -- High Output Current -- Low Parameter 54 74 54 74 54 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 - 2.6 - 5.0 8.0 16 Unit V C mA mA
FAST AND LS TTL DATA 5-1
SN54/74LS795 * SN54/74LS796 SN54/74LS797 * SN54/74LS798
LOGIC DIAGRAMS
VCC G2 A8 Y8 A7 Y7 A6 Y6 A5 Y5 20 19 18 17 16 15 14 13 12 11
VCC G2 A8 Y8 A7 Y7 A6 Y6 A5 Y5 20 19 18 17 16 15 14 13 12 11
123 G1 A1 Y1
4 A2
56789 10 Y2 A3 Y3 A4 Y4 GND
123 456789 10 G1 A1 Y1 A2 Y2 A3 Y3 A4 Y4 GND
SN54/74LS795
SN54/74LS796
VCC G2 A8 Y8 A7 Y7 A6 Y6 A5 Y5 20 19 18 17 16 15 14 13 12 11
VCC G2 A8 Y8 A7 Y7 A6 Y6 A5 Y5 20 19 18 17 16 15 14 13 12 11
123 G1 A1 Y1
4 A2
56789 10 Y2 A3 Y3 A4 Y4 GND
123 456789 10 G1 A1 Y1 A2 Y2 A3 Y3 A4 Y4 GND
SN54/74LS797
SN54/74LS798
FAST AND LS TTL DATA 5-2
SN54/74LS795 THRU SN54/74LS798
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits S bl Symbol VIH VIL VIK VOH P Parameter Input HIGH Voltage 54 Input LOW Voltage 74 Input Clamp Diode Voltage 54 Output HIGH Voltage 74 54, 74 VOL IOZH IOZL IIH Output LOW Voltage 74 Output Off Current -- HIGH Output Off Current -- LOW Input HIGH Current - 0.1 Input LOW Current A Input, Both G at 0.4 V G Input A Input, Both G at 2.0 V IOS ICC Short Circuit Current (Note 1) Power Supply pp y Current LS795/LS797 LS795/LS798 - 30 - 0.4 - 0.4 - 20 -130 26 21 0.35 0.5 20 - 20 20 V A A A mA mA A mA mA mA VCC = MAX 2.7 3.5 0.25 0.4 V V 2.5 - 0.65 3.5 0.8 - 1.5 V V VCC = MIN IOH = MAX MIN, IOL = 8.0 mA IOL = 16 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table Min 2.0 0.7 V Typ Max Ui Unit V T Test C di i Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA
VCC = MAX, VOUT = 2.7 V VCC = MAX, VOUT = 0.4 V VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX, VIN = 0.5 V VCC = MAX
IIL
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25C)
Limits LS795 / LS797 Symbol S bl tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter P Propagation Delay Output Enable Time Output Disable Time Min Typ 11 15 16 13 13 19 Max 16 22 25 20 20 27 LS796 / LS798 Min Typ 6.0 13 17 16 13 18 Max 10 17 27 25 20 27 Unit Ui ns ns ns VCC = 5.0 V CL = 15 pF Test C di i T Conditions
CL = 5.0 pF
FAST AND LS TTL DATA 5-3

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