MC14529B dual 4-channel analog data selector pinout

DIP-16. Joystick axis select for the A-to-D comparator, and sound source select for the TV and monitor.

Two 4-to-1 analog switches sharing the select lines A and B (PIA0 CA2 and CB2). The X half picks one of four joystick pots for the comparator; the Y half picks the sound source (DAC, cassette, cartridge, unused) and is enabled by PIA1 CB2. Dragon 32 and 64 (SA2120 sheet 2, IC20): STX (pin 1) is tied to +5 V; X0-X3 are right X, right Y, left X, left Y (JOYSTK(0) to (3)); Z (pin 9) goes to the LM393 comparator through R55 (10 kΩ); Y0 is the 6-bit DAC, Y1 cassette in, Y2 cartridge sound (cartridge pin 35), Y3 held LOW; W (pin 10) feeds the modulator and the monitor socket; STY (pin 15) comes from CB2 of the $FF20 PIA. CoCo 1 (8000073 sheet 2, U9): Z goes through R48 to the LM339 comparator U14, and the sound inputs are the DAC (pin 14), cassette in (13) and cartridge sound (12), with pin 11 grounded. Dragon Data lists it first for joystick, cassette and no-sound faults. CMOS: handle it with static care.

Open the interactive 4529 mux pinout

Pins

Pin	Name	Type	Signal
1	STX	ctrl	Strobe X: HIGH enables the X half; with STY also LOW the outputs are high impedance.
2	X0	io	X input 0, switched to Z when B and A are both LOW.
3	X1	io	X input 1 (B LOW, A HIGH).
4	X2	io	X input 2 (B HIGH, A LOW).
5	X3	io	X input 3 (B and A HIGH).
6	A	ctrl	Select bit A (LSB), common to both halves.
7	B	ctrl	Select bit B (MSB), common to both halves.
8	VSS	ground	Ground.
9	Z	io	X-half output: the selected X input.
10	W	audio	Y-half output: the selected Y input.
11	Y3	io	Y input 3 (B and A HIGH).
12	Y2	audio	Y input 2 (B HIGH, A LOW).
13	Y1	audio	Y input 1 (B LOW, A HIGH).
14	Y0	audio	Y input 0, switched to W when B and A are both LOW.
15	STY	ctrl	Strobe Y: HIGH enables the Y half; LOW turns it off (high impedance output when STX is also LOW).
16	VDD	power	+5 V supply.

MC14529B dual 4-channel analog data selector pinout

Pins

Fitted in

Sources