4 Pin Configuration and Functions

Figure 4-1 SN54AC240 J or W Package; SN74AC240 DB, DW, N, NS, or PW Package (Top View)

Figure 4-2 SN54AC240 FK Package (Top View)

Table 4-1 Pin Functions

NAME⁽¹⁾	PIN	TYPE	DESCRIPTION
1OE	1	I	Output enable 1
1A1	2	I	1A1 input
2Y4	3	O	2Y4 output
1A2	4	I	1A2 input
2Y3	5	O	2Y3 output
1A3	6	I	1A3 input
2Y2	7	O	2Y2 output
1A4	8	I	1A4 input
2Y1	9	O	2Y1 output
GND	10	—	Ground pin
2A1	11	I	2A1 input
1Y4	12	O	1Y4 output
2A2	13	I	2A2 input
1Y3	14	O	1Y3 output
2A3	15	I	2A3 input
1Y2	16	O	1Y2 output
2A4	17	I	2A4 input
1Y1	18	O	1Y1 output
2OE	19	I	Output enable 2
VCC	20	—	Power pin

(1) Signal Types: I = Input, O = Output, I/O = Input or Output