Quad 2-Input NAND Buffers with Open-Collector Outputs
Description
DM7438 • 7438 Quad 2-Input NAND Buffers with Open-Collector Outputs
September 1986 Revised February 2000
DM7438 • 7438 Quad 2-Input NAND Buffers with Open-Collector Outputs
General Description
This device contains four independent gates each of which performs the logic NAND function.
The open-collector outputs require external pull-up resistors for proper logical operation.
N1 (IOH) = total maximum output high current for all outputs tied to pull-up resistor N2 (IIH) = total maximum input high current for all inputs tied to pull-up resistor N3 (IIL) = total maximum input low current for all inputs tied to pull-up resistor
Pull-Up Resistor Equations
Where:
Ordering Code:
Order Number DM7438M DM7438N 7438SJ Package Number M14A N14A M14D Package Description 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.
150 Narrow 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.
300 Wide 14-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.
3mm Wide
Devices also available in Tape and Reel.
Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Y = AB Inputs A L L H H
H = HIGH Logic Level L = LOW Logic Level
Output B L H L H Y H H H L
© 2000 Fairchild Semiconductor Corporation
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DM7438 • 7438
Absolute Maximum Ratings(Note 1)
Supply Voltage Input Voltage Output Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5.
5V 7V 0°C to +70°C −65°C to +150°C
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 VCC VIH VIL VOH IOL TA Parameter Supply Voltage HIGH Level Input Voltage LOW Leve...
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