November 1989
Revised February 2000
DM74ALS125
Quad 3-STATE Buffer
General Description
This device contains four independent gates each of which performs a non-inverting buffer function. The outputs have the 3-STATE feature. The 3-STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or rampdown. This eliminates bus glitching problems that arise during power-up and power-down. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the disable time is shorter than the enable time of the outputs.
Features
■Advanced low power oxide-isolated ion-implanted Schottky TTL process
■Functional and pin compatible with the 74LS counterpart
■Switching response specified into 500Ω and 50 pF load
■Switching response specifications guaranteed over full temperature and VCC supply range
■PNP input design reduces input loading
■Low level drive current: 74ALS = 24 mA
Ordering Code:
Order Number |
Package Number |
Package Description |
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DM74ALS125M |
M14A |
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow |
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DM74ALS125N |
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 |
Logic Diagram |
Functional Table
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Y = A |
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Input |
Output |
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A |
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C |
Y |
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L |
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L |
L |
H |
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L |
H |
X |
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H |
Hi-Z |
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H = HIGH Logic Level
L = LOW Logic Level
X = Either LOW or HIGH Logic Level
Hi-Z = 3-STATE (Outputs are disabled)
Buffer STATE-3 Quad DM74ALS125
© 2000 Fairchild Semiconductor Corporation |
DS010620 |
www.fairchildsemi.com |
DM74ALS125 |
Absolute Maximum Ratings(Note 1) |
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Supply Voltage, VCC |
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7V |
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Input Voltage |
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7V |
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Voltage Applied to Disabled Output |
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5.5V |
Note 1: The Absolute Maximum Ratings are those values beyond which |
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Operating Free Air Temperature Range |
0 to +70°C the safety of the device cannot be guaranteed. The device should not be |
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Storage Temperature Range |
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−65°C to +150°C |
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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Typical θJA |
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The “Recommended Operating Conditions” table will define the conditions |
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N Package |
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78.0°C/W |
for actual device operation. |
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M Package |
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111.0°C/W |
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Recommended Operating Conditions |
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Symbol |
Parameter |
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Min |
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Typ |
Max |
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Units |
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VCC |
Supply Voltage |
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4.5 |
5 |
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5.5 |
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V |
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VIH |
HIGH Level Input Voltage |
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2 |
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V |
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VIL |
LOW Level Input Voltage |
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0.8 |
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V |
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IOH |
HIGH Level Output Current |
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−15 |
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mA |
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IOL |
LOW Level Output Current |
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24 |
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mA |
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TA |
Operating Free-Air Temperature |
0 |
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70 |
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°C |
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Electrical Characteristics |
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over recommended operating free air temperature (unless otherwise specified) |
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Symbol |
Parameter |
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Conditions |
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Min |
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Typ |
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Max |
Units |
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VIK |
Input Clamp Voltage |
VCC = 4.5V, II = −18 mA |
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−1.5 |
V |
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VOH |
HIGH Level |
VCC = 4.5V to 5.5V |
IOH = −0.4 mA |
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VCC − 2 |
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V |
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Output Voltage |
VCC = 4.5V |
IOH = −3 mA |
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2.4 |
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V |
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IOH = Max |
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2 |
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V |
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VOL |
LOW Level |
VCC = 4.5V |
IOL = 12 mA |
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0.25 |
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0.4 |
V |
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Output Voltage |
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IOL = 24 mA |
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0.35 |
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0.5 |
V |
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II |
Input Current at Max |
VCC |
= 5.5V, VI = 7V |
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0.1 |
mA |
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Input Voltage |
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IIH |
HIGH Level |
VCC |
= 5.5V, VI = 2.7V |
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20 |
μA |
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Input Current |
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IIL |
LOW Level |
VCC |
= 5.5V, VIL = 0.4V |
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−0.1 |
mA |
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Input Current |
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IO |
Output Drive |
VCC |
= 5.5V, VO = 2.25V |
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−30 |
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−112 |
mA |
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Current |
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IOZH |
HIGH Level 3-STATE |
VCC |
= 5.5V, VO = 2.7V |
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20 |
μA |
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Output Current |
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IOZL |
LOW Level 3-STATE |
VCC |
= 5.5V, VO = 0.4V |
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−20 |
μA |
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Output Current |
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ICC |
Supply Current |
VCC = 5.5V |
Outputs HIGH |
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7 |
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10 |
mA |
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Outputs LOW |
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10 |
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14 |
mA |
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3-STATE |
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13.5 |
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18 |
mA |
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www.fairchildsemi.com |
2 |
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