October 1988
Revised March 2000
DM74LS533
Octal Transparent Latch with 3-STATE Outputs
General Description
The DM74LS533 consists of eight latches with 3-STATE outputs for bus organized system applications. The flipflops appear transparent to the data when Latch Enable (LE) is HIGH. When LE is LOW, the data that meets the setup times is latched. Data appears on the bus when the Output Enable (OE) is LOW. When OE is HIGH the bus output is in the high impedance state. The DM74LS533 is the same as the DM74LS373, except that the outputs are inverted. For detailed specifications please see the DM74LS373 data sheet, but note that the propagation delays from data to output are 5.0 ns longer for the DM74LS533 than for the DM74LS373.
Features
■Eight latches in a single package
■3-STATE outputs for bus interfacing
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74LS533WM |
M20B |
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide |
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DM74LS533N |
N20A |
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide |
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Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol |
Connection Diagram |
VCC = Pin 20
GND = Pin 10
Pin Descriptions
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Pin Names |
Description |
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D0, D7 |
Data Inputs |
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LE |
Latch Enable Input (Active HIGH) |
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Output Enable Input (Active LOW) |
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OE |
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Complementary 3-STATE Outputs |
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O0–O7 |
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Function Table
OUTPUT |
Latch |
D |
Output |
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Enable |
Enable |
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O |
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L |
H |
H |
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L |
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L |
H |
L |
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H |
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L |
L |
X |
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Q |
O |
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H |
X |
X |
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Z |
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L = LOW State
H = HIGH State
X = Don't Care
Z = High Impedance State
QO = Previous Condition of O
Outputs STATE-3 with Latch Transparent Octal DM74LS533
© 2000 Fairchild Semiconductor Corporation |
DS009811 |
www.fairchildsemi.com |
DM74LS533
Absolute Maximum Ratings(Note 1)
Supply Voltage |
7V |
Note 1: The “Absolute Maximum Ratings are those values beyond which |
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the safety of the device cannot be guaranteed. The device should not be |
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Input Voltage |
7V |
operated at these limits. The parametric values defined in the Electrical |
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Characteristics tables are not guaranteed at the absolute maximum ratings. |
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Operating Free Air Temperature Range |
0°C to +70°C |
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The “Recommended Operating Conditions” table will define the conditions |
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Storage Temperature Range |
−65°C to +150°C |
for actual device operation. |
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Recommended Operating Conditions
Symbol |
Parameter |
Min |
Nom |
Max |
Units |
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VCC |
Supply Voltage |
4.75 |
5 |
5.25 |
V |
VIH |
High Level Input Voltage |
2 |
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V |
VIL |
Low Level Input Voltage |
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0.8 |
V |
IOH |
High Level Output Current |
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−2.6 |
mA |
IOL |
Low Level Output Current |
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24 |
mA |
TA |
Free Air Operating Temperature |
0 |
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70 |
°C |
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol |
Parameter |
Conditions |
Min |
Typ |
Max |
Units |
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(Note 2) |
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VI |
Input Clamp Voltage |
VCC = Min, II = −18 mA |
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−1.5 |
V |
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VOH |
HIGH Level |
VCC = Min, IOH = Max, |
2.4 |
3.4 |
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V |
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Output Voltage |
VIL = Max |
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VOL |
LOW Level |
VCC = Min, IOL = Max, |
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0.35 |
0.5 |
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Output Voltage |
VIH = Min |
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V |
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IOL = 12 mA, VCC = Min |
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0.4 |
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II |
Input Current @ Max Input Voltage |
VCC = Max, VI = 7V |
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0.1 |
mA |
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IIH |
HIGH Level Input Current |
VCC = Max, VI = 2.7V |
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20 |
μA |
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IIL |
LOW Level Input Current |
VCC = Max, VI = 0.4V |
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−0.4 |
mA |
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IOS |
Short Circuit |
VCC = Max |
−20 |
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−100 |
mA |
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Output Current |
(Note 3) |
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ICCZ |
Supply Current |
VCC = Max |
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46 |
mA |
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IOZL |
3-STATE Output Off |
VCC = VCCH |
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−20.0 |
μA |
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Current LOW |
VOZL = 0.4V |
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IOZH |
3-STATE Output Off |
VCC = VCCH |
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20.0 |
μA |
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Current HIGH |
VOZH = 2.7V |
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Note 2: All |
typicals are at VCC = 5V, TA = 25°C. |
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Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
VCC = +5.0V, TA = +25°C
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CL = 50 pF |
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Symbol |
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Parameter |
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RL = 2 kΩ |
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Units |
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Min |
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Max |
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tPLH |
Propagation Delay |
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23 |
ns |
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tPHL |
Data to Qx |
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23 |
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tPLH |
Propagation Delay |
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30 |
ns |
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tPHL |
LE to Qx |
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25 |
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tPZL |
Output Enable Time |
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22 |
ns |
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tPZH |
OE to Qx |
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20 |
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tPHZ |
Output Enable Time |
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20 |
ns |
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tPLZ |
OE to Qx |
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25 |
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