IC number:	BT458
IC function:	256 Color Palette RAMDAC
Related components:	BT438 (clock generaror), MS176, SAB82C171, ADV476 (RAMDACs), ADV101, VP101, ADV7120, STV8438 (video DACs)

Component documentation

IC number	Manufacturer	Documentation
BT458	Brooktree (now Conexant)	Not available

Component versions

IC number	Package	CBM part number	CBM part description
BT458LPJ	84-pin PLCC	390860-01	BT458LPJ110 RAMDAC (PLCC PKG)

Positions

Device	Position	Package
A2410	U911	PLCC

Pinout

Pin	Type	Name	Signal name
			A2410
1	Input	P0A	S1(0)
2..6	Input	OL1E..OL1A	GND, S4(9)..S1(9)
7..11	Input	OL0E..OL0A	GND, S4(8)..S1(8)
12..19	I/O	D[0]..D[7]	DATA(0)..DATA(7)
20	Input	CE*	BTCE*
21..22	Power	GND	GND
23	Power	VAA	VAA
24..25	Input	C0..C1	ADDR(0)..ADDR(1)
26	Input	R/W	ADDR(2)
27	Power	VAA	VAA
28	Output	IOR	R
29	Output	IOG	G
30	Output	IOB	B
31	Analog	FSAJUST	GND via R911
32	Analog	COMP	VAA via C911
33	Power	VREF	Connected to VREF of BT438
34	Power	GND	GND
35	Power	VAA	VAA
36	Power	GND	GND
37	Power	VAA	VAA
38..42	Input	P7E..P7A	GND, S4(7)..S1(7)
43..47	Input	P6E..P6A	GND, S4(6)..S1(6)
48..52	Input	P5E..P5A	GND, S4(5)..S1(5)
53..57	Input	P4E..P4A	GND, S4(4)..S1(4)
58	Input	SYNC*	Connected to pin 8 of U114
59	Input	BLANK*	D_BLANK*
60	Input	LD*	Connected to LDA of BT438 via E923
61	Input	CLOCK	Connected to CLK of BT438
62	Input	CLOCK*	Connected to CLK* of BT438
63..64	Power	VAA	VAA
65	Power	GND	GND
66..70	Input	P3E..P3A	GND, S4(3)..S1(3)
71..75	Input	P2E..P2A	GND, S4(2)..S1(2)
76..80	Input	P1E..P1A	GND, S4(1)..S1(1)
81..84	Input	P0E..P0B	GND, S4(0)..S2(1)