April 1984
Revised March 2000
DM74AS21
Dual 4-Input AND Gate
General Description
This device contains two independent 4-input gates, each of which performs the logic AND function.
Features
■Switching specifications at 50 pF
■Switching specifications guaranteed over full temperature and VCC range
■Advanced oxide-isolated, ion-implanted Schottky TTL process
■Functionally and pin for pin compatible with Schottky, low power Schottky, and advanced low power Schottky TTL counterpart
■Improved AC performance over Schottky, low power Schottky and advanced low power Schottky counterparts
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74AS21M |
M14A |
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow |
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DM74AS21N |
N14A |
14-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.
Connection Diagram |
Function Table |
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Inputs |
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Output |
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A |
B |
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C |
D |
Y |
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H |
H |
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H |
H |
H |
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L |
X |
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X |
X |
L |
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X |
L |
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X |
X |
L |
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X |
X |
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L |
X |
L |
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X |
X |
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X |
L |
L |
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H = HIGH Logic Level |
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L = LOW Logic Level |
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X = Either LOW or HIGH Logic Level |
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Gate AND Input-4 Dual DM74AS21
© 2000 Fairchild Semiconductor Corporation |
DS006277 |
www.fairchildsemi.com |
DM74AS21
Absolute Maximum Ratings(Note 1)
Supply Voltage |
7V |
Input Voltage |
7V |
Operating Free Air Temperature Range |
0°C to +70°C |
Storage Temperature Range |
−65°C to +150°C |
Typical θJA |
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N Package |
84.0°C/W |
M Package |
114.0°C/W |
Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol |
Parameter |
Min |
Nom |
Max |
Units |
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VCC |
Supply Voltage |
4.5 |
5 |
5.5 |
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 |
mA |
IOL |
LOW Level Output Current |
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20 |
mA |
TA |
Free Air Operating Temperature |
0 |
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70 |
°C |
Electrical Characteristics
over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol |
Parameter |
Conditions |
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Min |
Typ |
Max |
Units |
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VIK |
Input Clamp Voltage |
VCC = 4.5V, II = −18 mA |
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−1.2 |
V |
VOH |
HIGH Level |
IOH = −2 mA, |
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VCC − 2 |
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V |
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Output Voltage |
VCC = 4.5V to 5.5V |
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VOL |
LOW Level |
VCC = 4.5V |
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0.35 |
0.5 |
V |
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Output Voltage |
IOL = 20 mA |
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II |
Input Current @ Max Input Voltage |
VCC = 5.5V, VIH = 7V |
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0.1 |
mA |
IIH |
HIGH Level Input Current |
VCC = 5.5V, VIH = 2.7V |
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20 |
μA |
IIL |
LOW Level Input Current |
VCC = 5.5V, VIL = 0.4V |
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−0.5 |
mA |
IO |
Output Drive Current |
VCC = 5.5V, VO = 2.25V |
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−30 |
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−112 |
mA |
ICC |
Supply Current |
VCC = 5.5V |
Outputs HIGH |
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2.9 |
4.6 |
mA |
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Outputs LOW |
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7.4 |
12 |
mA |
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Switching Characteristics
over recommended operating free air temperature range
Symbol |
Parameter |
Conditions |
Min |
Max |
Units |
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tPLH |
Propagation Delay Time |
VCC = 4.5V to 5.5V |
1 |
6 |
ns |
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LOW-to-HIGH Level Output |
RL = 500Ω |
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tPHL |
Propagation Delay Time |
CL = 50 pF |
1 |
6 |
ns |
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HIGH-to-LOW Level Output |
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www.fairchildsemi.com |
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