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
Pull-Up Resistor Equations
RMAX
e
VCC (Min) b VOH N1 (IOH) a N2 (IIH)
RMIN
e
VCC (Max) b VOL IOL b N3 (IIL)
Wh
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DM5438 DM7438 Quad 2-Input NAND Buffers with Open-Collector Outputs
June 1989
DM5438 DM7438 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
Pull-Up Resistor Equations
RMAX
e
VCC (Min) b VOH N1 (IOH) a N2 (IIH)
RMIN
e
VCC (Max) b VOL IOL b N3 (IIL)
Where N1 (IOH) e total maximum output high current for all outputs tied to pull-up resistor
N2 (IIH) e total maximum input high current for all inputs tied to pull-up resistor
N3 (IIL) e total maximum input low current for all inputs tied to pull-up resistor
Connection Diagram
Dual-In-Line Package
Function Table
TL F 6513 – 1
DM7438 Datasheet
