IC number:	MC68881, MC68882
IC function:	Floating-point co-processor
Related components:	MC68020, MC68EC020, MC68030, MC68EC030 (main processors), MC68040 (successor, on-chip math co-processor)

Component documentation

IC number	Manufacturer	Documentation
MC68881	Motorola (now Freescale)	Web page, Programmer's Reference Manual (PDF), Programmer's Reference Manual Errata
MC68882	Motorola (now Freescale)	Web page, Technical Summary (PDF), Programmer's Reference Manual (PDF), Programmer's Reference Manual Errata

Component package and speed versions

IC number	Package	Speed	CBM part number	CBM part description
MC68881RC16	Ceramic 68-Pin PGA 10 × 10	16 MHz	390277-01	68881 FPU 16MHZ
MC68881FN16	Plastic 68-Pin PLCC	16 MHz	390277-03	MC68881 16 MHZ PLCC
MC68882RC25	Ceramic 68-Pin PGA 10 × 10	25 MHz	390434-01	MC68882 FPU 25MHZ
MC68882FN25	Plastic 68-Pin PLCC	25 MHz	390434-02	MC68882 25 MHZ PLCC

Positions

Device	Position	Component	Package	Speed
A3000	U101	MC68881	PLCC	16 MHz
		MC68882		25 MHz
A3000T	U101	MC68882	PLCC	25 MHz
A1200	U0 (not installed)		PLCC
A2620	U201	MC68881	PGA	16 MHz
A2630	U201	MC68881	PGA	16 MHz
		MC68882		25 MHz
68020/68030 CPU card, 25 MHz 68EC030, no FPU	U101 (not installed)		PLCC
	U104 (not installed)		PGA
68020/68030 CPU card, 25 MHz, 68030, 68020, FPU, ROM ReMap	U101	MC68882	PLCC	25 MHz
	U104 (not installed)		PGA

Pinout 68881/68882 PGA package

Pin		Type	Name	Signal name
Grid	Number			A2630
A1	1	Power	VCC	VCC
A2	2	Power	GND	GND
A3..A4	3..4	I/O	D0..D1	D0..D1
A5..A6	5..6	I/O	D3..D4	D3..D4
A7..A9	7..9	I/O	D6..D8	D6..D8
A10	10	Power	GND	GND
B1	11	Power	VCC	VCC
B2..B3	12..13	Power	GND	GND
B4	14	Power	_SENSE	_SENSE
B5	15	I/O	D2	D2
B6	16	I/O	D6	D6
B7	17	Power	GND	GND
B8	18	Power	VCC	VCC
B9..B10	19..20	I/O	D10..D11	D10..D11
C1	21	Power	GND	GND
C2	22	Input	CLK	Connected to U203 or via J202, U307 and R202 to _CPUCLK
C3	23	Power	GND	GND
C8	24	I/O	D9	D9
C9..C10	25..26	I/O	D13..D14	D13..D14
D1	27	Input	_RESET	_GRESET
D2	28	Power	GND	GND
D9	29	I/O	D12	D12
D10	30	I/O	D15	D15
E1	31	N/C	NC	unused
E2	32	Power	VCC	VCC
E9	33	Power	VCC	VCC
E10	34	Power	GND	GND
F1	35	Input	_SIZE	VCC via RP201
F2	36	Power	GND	GND
F9..F10	37..38	I/O	D17..D16	D17..D16
G1	39	Input	_DS	_DS
G2	40	Input	A4	A4
G9	41	I/O	D20	D20
G10	42	I/O	D18	D18
H1	43	Input	_AS	_AS
H2	44	Input	A2	A2
H3	45	Input	A0	VCC via RP201
H8	46	Power	VCC	VCC
H9	47	Power	GND	GND
H10	48	I/O	D19	D19
J1	49	Input	A3	A3
J2	50	Power	VCC	VCC
J3	51	Input	_CS	_FPUCS
J4	52	Output	_DSACK0	_DSACK0
J5	53	I/O	D31	D31
J6	54	I/O	D28	D28
J7	55	I/O	D25	D25
J8	56	Power	GND	GND
J9	57	I/O	D23	D23
J10	58	I/O	D21	D21
K1	59	Input	A1	A1
K2	60	Input	R/_W	R_W
K3	61	Power	GND	GND
K4	62	Output	_DSACK1	_DSACK1
K5..K6	63..64	I/O	D30..D29	D30..D29
K7..K8	65..66	I/O	D27..D26	D27..D26
K9	67	I/O	D24	D24
K10	68	I/O	D22	D22

Pinout 68881/68882 PLCC package

Pin	Type	Name	Signal name
			A3000, A3000T	A1200
1..3	I/O	D2..D0	D2..D0
4	Power	_SENSE	unused	_FPU_SENSE
5..9	Power	GND	GND
10	Power	VCC	+5V	VCC
11	Input	CLK	CLK30	CPUCLK
12	Power	GND	GND
13	Input	_RESET	_FPURST	_RST
14	Power	GND	GND
15	N/C	NC	unused
16	Input	_SIZE	_FPUSIZE	VCC
17	Power	GND	GND
18	Input	_DS	_DS
19	Input	_AS	_AS
20	Input	A5	_FPUSIZE	VCC
21..26	Input	A4..A0	A4..A0
27	Power	VCC	+5V	VCC
28	Input	R/_W	R_W
29	Input	_CS	_TRUE_FPUCS	_FPU_CS
30	Power	GND	GND
31..32	Output	_DSACK0.._DSACK1	_DSACK0.._DSACK1	_DSACK_0.._DSACK_1
33..40	I/O	D31..D24	D31..D24
41	Power	GND	GND
42	I/O	D23	D23
43	Power	VCC	+5V	VCC
44..50	I/O	D22..D16	D22..D16
51	Power	GND	GND
52..53	Power	VCC	+5V	VCC
54..60	I/O	D15..D9	D15..D9
61	Power	VCC	+5V	VCC
62	I/O	D8	D8
63	Power	GND	GND
64..68	I/O	D7..D3	D7..D3